module (..., package.seeall)

-- Load libraries
require("modelfunctions")
require("posix")
require("fs")
require("format")
require("validator")
require("luasql.postgres")
require("session")

-- Set variables
local DatabaseName = "provisioning"
local DatabaseUser = "postgres"
local DatabasePassword

local path = "PATH=/usr/local/bin:/usr/bin:/bin:/usr/local/sbin:/usr/sbin:/sbin "
local baseurl = "/etc/provisioning/templates/"
local updatedevicescriptfile = "/etc/provisioning/update_device.lua"
local updatedeviceparamsscriptfile = "/etc/provisioning/update_device_params.lua"
local deletedevicescriptfile = "/etc/provisioning/delete_device.lua"
local determineclassscriptfile = "/etc/provisioning/determine_class.lua"
local processputscriptfile = "/etc/provisioning/process_put.lua"
local scriptfiles = {updatedevicescriptfile, updatedeviceparamsscriptfile, deletedevicescriptfile, determineclassscriptfile, processputscriptfile}
local env
local con

local saved_devices = {}
local saved_device_params = {}

local table_creation_scripts = require("provisioning/provisioning-scripts")

-- ################################################################################
-- LOCAL FUNCTIONS
local function escape_quotes(str)
	return string.gsub(str or "", "'", "'\\''")
end

local function assert (v, m)
	if not v then
		m = m or "Assertion failed!"
		error(m, 0)
	end
	return v, m
end

-- Escape special characters in sql statements
local escape = function(sql)
	sql = sql or ""
	sql = string.gsub(sql, "'", "''")
	return string.gsub(sql, "\\", "\\\\")
end

local createdatabase = function()
        local result = {}
	-- First, create the user
	if DatabaseUser ~= "postgres" then
		local cmd = path..'psql -U postgres -c "CREATE USER '..DatabaseUser..''
		if DatabasePassword then
			cmd = cmd .. ' WITH PASSWORD \''..DatabasePassword..'\''
		end
		cmd = cmd .. '" 2>&1'
		local f = io.popen(cmd)
		table.insert(result, f:read("*a"))
		f:close()
	end
	
	-- Create the database
	local cmd = path..'psql -U postgres -c "CREATE DATABASE '..DatabaseName..' WITH OWNER '..DatabaseUser..'" 2>&1'
	local f = io.popen(cmd)
	table.insert(result, f:read("*a"))
	f:close()

	cmd = path..'createlang -U postgres plpgsql '..DatabaseName
	f = io.popen(cmd)
	table.insert(result, f:read("*a"))
	f:close()

	logevent(table.concat(result, "\n"))

	return table.concat(result, "\n")
end
	
-- Delete the database and roles
local deletedatabase = function()
	local result = {}
	
	local cmd = path..'psql -U postgres -c "DROP DATABASE '..DatabaseName..'" 2>&1'
	local f = io.popen(cmd)
	table.insert(result, f:read("*a"))
	f:close()

	if DatabaseUser ~= "postgres" then
		cmd = path..'psql -U postgres -c "DROP ROLE '..DatabaseUser..'" 2>&1'
		f = io.popen(cmd)
		table.insert(result, f:read("*a"))
		f:close()
	end

	logevent(table.concat(result, "\n"))

	return table.concat(result, "\n")
end

-- Declare runsqlcommand first because it's recursive
-- we also have recursion when runsqlcommand calls runscript, so we have to be careful in creating table_creation_scripts
local runsqlcommand

local databaseconnect = function()
	if not con then
		-- create environment object
		env = assert (luasql.postgres())
		-- connect to data source
		local err
		con, err = env:connect(DatabaseName, DatabaseUser, DatabasePassword)
		if err and string.match(err, "Error connecting to database.") then
			createdatabase()
			con, err = env:connect(DatabaseName, DatabaseUser, DatabasePassword)
			if con then
				-- Let's create all the tables from the start
				for n,v in pairs(table_creation_scripts) do
					if not string.match(n, "^_") then
						runsqlcommand("SELECT * FROM "..n.." LIMIT 1")
					end
				end
			end
		end
		assert(con, err)
		return true
	end
	return false
end

local databasedisconnect = function()
	if env then
		env:close()
		env = nil
	end
	if con then
		con:close()
		con = nil
	end
end

local runscript = function(script, in_transaction)
	for i,scr in ipairs(script) do
		runsqlcommand(scr, in_transaction)
	end
end

runsqlcommand = function(sql, in_transaction)
logevent(sql)
	if in_transaction then assert(con:execute("SAVEPOINT before_command")) end
        local res, err = con:execute(sql)
	if not res and err then
		-- Catch the error to see if it's caused by lack of table
logevent(err)
		local table = string.match(err, "relation \"(%S+)\" does not exist")
		if table and table_creation_scripts[table] then
			if in_transaction then assert(con:execute("ROLLBACK TO before_command")) end
			runscript(table_creation_scripts[table])
			runsqlcommand(sql)
		else
			assert(res, err)
		end
	else
		if in_transaction then assert(con:execute("RELEASE SAVEPOINT before_command")) end
	end
end

local getselectresponse
getselectresponse = function(sql, in_transaction)
	local retval = {}
	if in_transaction then assert(con:execute("SAVEPOINT before_select")) end
        local res, err = pcall(function()
logevent(sql)
		local cur = assert (con:execute(sql))
		local row = cur:fetch ({}, "a")
		while row do
			local tmp = {}
			for name,val in pairs(row) do
				tmp[name] = val
			end
			retval[#retval + 1] = tmp
			row = cur:fetch (row, "a")
		end
		cur:close()
	end)
	if not res and err then
logevent(err)
		-- Catch the error to see if it's caused by lack of table
		local table = string.match(err, "relation \"(%S+)\" does not exist")
		if table and table_creation_scripts[table] then
			if in_transaction then assert(con:execute("ROLLBACK TO before_select")) end
			runscript(table_creation_scripts[table])
			return getselectresponse(sql)
		else
			assert(res, err)
		end
	else
		if in_transaction then assert(con:execute("RELEASE SAVEPOINT before_select")) end
	end
	return retval
end

local validateparam
validateparam = function(p)
	if p.type == "group" then
		local success = true
		for n,p2 in pairs(p.value) do
			success = validateparam(p2) and success
		end
		return success
	elseif p.type == "select" then
		return modelfunctions.validateselect(p)
	elseif p.type == "text" and p.regexp and p.regexp ~= "" then
		if not string.match(p.value, p.regexp) then
			p.errtxt = "Invalid value"
			return false
		end
	end
	return true
end

-- These are the functions that may be called from within loaded Lua code
-- The actual functions are added at the end of the file, after they're declared
local functions = {}

local validateparamcoded
validateparamcoded = function(p, top)
	top = top or p
	local success = true
	if p.type == "group" then
		for n,p2 in pairs(p.value) do
			success = validateparamcoded(p2, top) and success
		end
		return success
	end
	if p.validate and p.validate ~= "" then
		-- We have Lua validation code
		local env = {}
		setmetatable (env, {__index = _G})
		-- loadfile loads into the global environment
		-- so we set env 0, not env 1
		setfenv (0, env)
		local f = loadstring(p.validate)
		if (f) then
		        local res, err = pcall(function()
				p.value, p.errtxt = f(p.value, functions, top)
				if p.errtxt then success = false end
			end)
			if not res and err then
				success = false
				p.errtxt = "Exception in validate code\n"..err
			end
		end
		setfenv (0, _G)
	end
	return success
end

local function callscript(script, ...)
	local result
	local env = {}
	setmetatable (env, {__index = _G})
	-- loadfile loads into the global environment
	-- so we set env 0, not env 1
	setfenv (0, env)
	local f = loadfile(script)
	if f then
	        local res, err = pcall(function(...)
			result = { f(functions, ...) }
		end, ...)
		if not res and err then
			assert(res, "Exception in "..script.." script\n"..err)
		end
	end
	setfenv (0, _G)
	return unpack(result)
end

local function validateluacode(code)
	local success = true

	-- Validate that contents are valid lua code
	local env = {}
	setmetatable (env, {__index = _G})
	-- loadfile loads into the global environment
	-- so we set env 0, not env 1
	setfenv (0, env)
	local f,errtxt = loadstring(code)
	if not f then
		success = false
	end
	setfenv (0, _G)
	-- setmetatable (self.conf.app_hooks, {})

	return success, errtxt
end

local function validatefiledetails(filedetails)
	local success, errtxt = validateluacode(filedetails.value.filecontent.value)
	if not success then
		filedetails.value.filecontent.errtxt = "Invalid Lua code\n"..(errtxt or "")
	end
	return success, filedetails
end

local duplicatestructure
duplicatestructure = function(value, saved)
	saved = saved or {}
	if type(value) == "table" then
		if saved[value] then
			return saved[value]
		else
			local output = {}
			saved[value] = output
			for k,v in pairs(value) do
				output[k] = duplicatestructure(v, saved)
			end
			return output
		end
	else
		return value
	end
end

-- ################################################################################
-- PUBLIC FUNCTIONS

list_templates = function()
	local retval = {}
	local errtxt
	-- Get the templates from the DB
        local res, err = pcall(function()
		local connected = databaseconnect()
		local sql = "SELECT value AS filename, label, seq FROM provisioning_options WHERE param_id = (SELECT param_id FROM provisioning_params WHERE name = 'template') ORDER BY seq ASC, label ASC, value ASC"
		retval = getselectresponse(sql)
		if connected then databasedisconnect() end
	end)
	if not res and err then
		errtxt = err
	end
	local reversed = {}
	for i,t in ipairs(retval) do
		reversed[t.filename] = i
	end
	-- Get the file stats for each template and add in any template files that aren't in the DB
	fs.create_directory(baseurl)
	for f in posix.files(baseurl) do
		local file = baseurl..f
                local details = fs.stat(file)
		if details.type == "regular" then
			if not reversed[file] then
				retval[#retval+1] = {filename=file}
				reversed[file] = #retval
			end
			local t = retval[reversed[file]]
			t.filesize = details.size
			t.mtime = details.mtime
		end
	end

	return cfe({ type="structure", value=retval, label="List of Templates", errtxt=errtxt })
end

get_template = function(filename)
	local retval = {}
	if filename and not string.match(filename, "/") then
		filename = baseurl .. filename
	end
	retval.filename = cfe({value=filename or "", label="File Name", descr="Must be in "..baseurl, seq=1})
	retval.label = cfe({label="Label", seq=2})
	retval.seq = cfe({label="Sequence", seq=3})
	local errtxt
	if filename and filename ~= "" then
	        local res, err = pcall(function()
			local connected = databaseconnect()
			local sql = "SELECT * FROM provisioning_options WHERE param_id=(SELECT param_id FROM provisioning_params WHERE name = 'template') AND value='"..escape(filename).."' ORDER BY seq ASC, label ASC, value ASC"
			local tmp = getselectresponse(sql)
			if tmp and #tmp > 0 then
				for n,v in pairs(tmp[1]) do
					if n == "value" then
						retval.filename.value = v
					elseif retval[n] then
						retval[n].value = v
					end
				end
			end
			if connected then databasedisconnect() end
		end)
		if not res and err then
			errtxt = err
		end
	end
	local filedetails = modelfunctions.getfiledetails(retval.filename.value, function(filename) return validator.is_valid_filename(filename, baseurl) end)
	for i,n in ipairs({"filecontent", "filesize", "mtime"}) do
		retval[n] = filedetails.value[n]
	end

	return cfe({ type="group", value=retval, label="Provisioning Template", errtxt=errtxt })
end

create_template = function(template)
	return update_template(template, true)
end

update_template = function(template, create)
	local success = true
	local errtxt
	-- Validate the settings
	if template.value.filename and not string.match(template.value.filename.value, "/") then
		template.value.filename.value = baseurl .. template.value.filename.value
	end
	if not validator.is_valid_filename(template.value.filename.value, baseurl) then
		success = false
		template.value.filename.errtxt = "Invalid filename"
	end
	if template.value.label.value == "" then
		success = false
		template.value.label.errtxt = "Cannot be blank"
	end
	if not validator.is_integer(template.value.seq.value) then
		success = false
		template.value.seq.errtxt = "Must be an integer"
	end
	if success then
        	local res, err = pcall(function()
			local connected = databaseconnect()
			local sql = "SELECT * FROM provisioning_options WHERE param_id=(SELECT param_id FROM provisioning_params WHERE name = 'template') AND value='"..escape(template.value.filename.value).."'"
			local tmp = getselectresponse(sql)
			if not create and (not tmp or #tmp == 0) then
				success = false
				errtxt = "Template does not exist"
			elseif create and #tmp > 0 then
				success = false
				errtxt = "Template already exists"
			end
			if success then
				if create then
					sql = "INSERT INTO provisioning_options VALUES((SELECT param_id FROM provisioning_params WHERE name='template'), '"..escape(template.value.label.value).."', '"..escape(template.value.filename.value).."', '"..escape(template.value.seq.value).."')"
				else
					sql = "UPDATE provisioning_options SET (label, seq) = ('"..escape(template.value.label.value).."', '"..escape(template.value.seq.value).."') WHERE param_id=(SELECT param_id FROM provisioning_params WHERE name = 'template') AND value='"..escape(template.value.filename.value).."'"
				end
				runsqlcommand(sql)

				fs.write_file(template.value.filename.value, string.gsub(format.dostounix(template.value.filecontent.value), "\n+$", ""))
			end
			if connected then databasedisconnect() end
		end)
		if not res and err then
			success = false
			errtxt = err
		end
	end
	if not success then
		if create then
			template.errtxt = errtxt or "Failed to create template"
		else
			template.errtxt = errtxt or "Failed to save template"
		end
	end
	return template
end

delete_template = function(filename)
	local result = ""
	local errtxt
       	local res, err = pcall(function()
		local connected = databaseconnect()
		local sql = "SELECT * FROM provisioning_options WHERE param_id=(SELECT param_id FROM provisioning_params WHERE name = 'template') AND value='"..escape(filename).."'"
		local tmp = getselectresponse(sql)
		if #tmp == 0 then
			errtxt = "Template does not exist"
		else
			-- Remove the template
			sql = "DELETE FROM provisioning_options WHERE param_id=(SELECT param_id FROM provisioning_params WHERE name = 'template') AND value='"..escape(filename).."'"
			runsqlcommand(sql)
			-- Delete the template file
			os.remove(filename)
			result = "Template Deleted"
		end
		if connected then databasedisconnect() end
	end)
	if not res and err then
		errtxt = err
	end

	return cfe({ value=result, errtxt=errtxt, label="Delete Template Result" })
end

list_class_groups = function()
	local retval = {}
	local errtxt
	-- Get the groups from the DB
        local res, err = pcall(function()
		local connected = databaseconnect()
		local sql = "SELECT * FROM provisioning_class_groups ORDER BY seq ASC, label ASC"
		retval = getselectresponse(sql)
		if connected then databasedisconnect() end
	end)
	if not res and err then
		errtxt = err
	end

	return cfe({ type="structure", value=retval, label="List of Class Groups", errtxt=errtxt })
end

get_class_group = function(class_group_id)
	local retval = {}
	retval.class_group_id = cfe({value=class_group_id or "", label="Class Group ID", seq=1})
	retval.name = cfe({label="Name", seq=2})
	retval.label = cfe({label="Label", seq=3})
	retval.seq = cfe({label="Sequence", seq=4})
	local errtxt
	local res, err = pcall(function()
		local connected = databaseconnect()
		if class_group_id and class_group_id ~= "" then
			sql = "SELECT * FROM provisioning_class_groups WHERE class_group_id='"..escape(class_group_id).."'"
			tmp = getselectresponse(sql)
			if tmp and #tmp > 0 then
				for n,v in pairs(tmp[1]) do
					if retval[n] then
						retval[n].value = v
					end
				end
			end
		end
		if connected then databasedisconnect() end
	end)
	if not res and err then
		errtxt = err
	end

	return cfe({ type="group", value=retval, label="Provisioning Class Group", errtxt=errtxt })
end

create_class_group = function(group)
	return update_class_group(group, true)
end

update_class_group = function(group, create)
	local success = true
	local errtxt
	-- Validate the settings
	if group.value.name.value == "" then
		success = false
		group.value.name.errtxt = "Cannot be blank"
	elseif string.find(group.value.name.value, "%W") then
		success = false
		group.value.name.errtxt = "Must only contain alphanumeric characters"
	end
	if group.value.label.value == "" then
		success = false
		group.value.label.errtxt = "Cannot be blank"
	end
	if not validator.is_integer(group.value.seq.value) then
		success = false
		group.value.seq.errtxt = "Must be an integer"
	end
	if success then
        	local res, err = pcall(function()
			local connected = databaseconnect()
			if not create then
				local sql = "SELECT * FROM provisioning_class_groups WHERE class_group_id='"..escape(group.value.class_group_id.value).."'"
				local tmp = getselectresponse(sql)
				if not tmp or #tmp == 0 then
					success = false
					errtxt = "Group does not exist"
				end
			end
			if success then
				local sql = "BEGIN TRANSACTION"
				runsqlcommand(sql)
				if create then
					sql = "INSERT INTO provisioning_class_groups VALUES(DEFAULT, '"..escape(group.value.name.value).."', '"..escape(group.value.label.value).."', '"..escape(group.value.seq.value).."')"
					runsqlcommand(sql, true)
					sql = "SELECT class_group_id FROM provisioning_class_groups WHERE label='"..escape(group.value.label.value).."'"
					local tmp = getselectresponse(sql, true)
					if tmp and #tmp>0 then
						group.value.class_group_id.value = tmp[1].class_group_id
					end
				else
					sql = "UPDATE provisioning_class_groups SET (name, label, seq) = ('"..escape(group.value.name.value).."', '"..escape(group.value.label.value).."', '"..escape(group.value.seq.value).."') WHERE class_group_id='"..escape(group.value.class_group_id.value).."'"
					runsqlcommand(sql, true)
				end

				sql = "COMMIT"
				runsqlcommand(sql)
			end
			if connected then databasedisconnect() end
		end)
		if not res and err then
			pcall(function() con:execute("ROLLBACK") end)
			success = false
			errtxt = err
		end
	end
	if not success then
		if create then
			group.errtxt = errtxt or "Failed to create class group"
		else
			group.errtxt = errtxt or "Failed to save class group"
		end
	end
	return group
end

delete_class_group = function(class_group_id)
	local result = ""
	local errtxt
       	local res, err = pcall(function()
		local connected = databaseconnect()
		local sql = "SELECT * FROM provisioning_class_groups WHERE class_group_id='"..escape(class_group_id).."'"
		local tmp = getselectresponse(sql)
		if #tmp == 0 then
			errtxt = "Group does not exist"
		else
			sql = "DELETE FROM provisioning_class_groups WHERE class_group_id='"..escape(class_group_id).."'"
			runsqlcommand(sql)
			result = "Class Group Deleted"
		end
		if connected then databasedisconnect() end
	end)
	if not res and err then
		errtxt = err
	end

	return cfe({ value=result, errtxt=errtxt, label="Delete Class Group Result" })
end

list_classes = function()
	local retval = {}
	local errtxt
	-- Get the classes from the DB
        local res, err = pcall(function()
		local connected = databaseconnect()
		local sql = "SELECT class_id, g.label AS group, g.name, c.label, c.seq FROM provisioning_classes c JOIN provisioning_class_groups g USING(class_group_id) ORDER BY g.seq ASC, g.label ASC, c.seq ASC, c.label ASC"
		retval = getselectresponse(sql)
		if connected then databasedisconnect() end
	end)
	if not res and err then
		errtxt = err
	end

	return cfe({ type="structure", value=retval, label="List of Classes", errtxt=errtxt })
end

get_class = function(class_id)
	local retval = {}
	retval.class_id = cfe({value=class_id or "", label="Class ID", seq=1})
	retval.class_group_id = cfe({type="select", label="Class Group", option={}, seq=2})
	retval.label = cfe({label="Label", seq=3})
	retval.seq = cfe({label="Sequence", seq=4})
	retval.groups = cfe({type="group", value={}, label="Parameter Groups", seq=5})
	local errtxt
	local res, err = pcall(function()
		local groups = {}
		local connected = databaseconnect()
		if class_id and class_id ~= "" then
			local sql = "SELECT * FROM provisioning_classes WHERE class_id='"..escape(class_id).."'"
			local tmp = getselectresponse(sql)
			if tmp and #tmp > 0 then
				for n,v in pairs(tmp[1]) do
					if retval[n] then
						retval[n].value = v
					end
				end
			end
			-- Now, get the class-to-paramgroup mappings
			sql = "SELECT group_id FROM classes_to_param_groups WHERE class_id="..escape(class_id)
			tmp = getselectresponse(sql)
			for i,g in ipairs(tmp) do
				groups[g.group_id] = true
			end
		end
		-- Get the class_group_id options
		sql = "SELECT * from provisioning_class_groups ORDER BY seq ASC, label ASC"
		tmp = getselectresponse(sql)
		for i,g in ipairs(tmp) do
			retval.class_group_id.option[#retval.class_group_id.option + 1] = {value=g.class_group_id, label=g.label}
		end
		-- Finally, get the paramgroup options
		sql = "SELECT group_id, name, label FROM provisioning_groups ORDER BY seq ASC, name ASC"
		tmp = getselectresponse(sql)
		for i,g in ipairs(tmp) do
			if not retval.groups.value[g.name] then
				retval.groups.value[g.name] = cfe({type="select", label=g.name, option={{value="", label=""}}, seq=i})
			end
			local group = retval.groups.value[g.name]
			group.option[#group.option + 1] = {value=g.group_id, label=g.label}
			if groups[g.group_id] then
				group.value = g.group_id
			end
		end
		if connected then databasedisconnect() end
	end)
	if not res and err then
		errtxt = err
	end

	return cfe({ type="group", value=retval, label="Provisioning Class", errtxt=errtxt })
end

create_class = function(class)
	return update_class(class, true)
end

update_class = function(class, create)
	local success = true
	local errtxt
	-- Validate the settings
	success = modelfunctions.validateselect(class.value.class_group_id) and success
	if class.value.label.value == "" then
		success = false
		class.value.label.errtxt = "Cannot be blank"
	end
	if not validator.is_integer(class.value.seq.value) then
		success = false
		class.value.seq.errtxt = "Must be an integer"
	end
	for n,g in pairs(class.value.groups.value) do
		success = modelfunctions.validateselect(g) and success
	end
	if success then
        	local res, err = pcall(function()
			local connected = databaseconnect()
			if not create then
				local sql = "SELECT * FROM provisioning_classes WHERE class_id='"..escape(class.value.class_id.value).."'"
				local tmp = getselectresponse(sql)
				if not tmp or #tmp == 0 then
					success = false
					errtxt = "Class does not exist"
				end
			end
			if success then
				local sql = "BEGIN TRANSACTION"
				runsqlcommand(sql)
				if create then
					sql = "INSERT INTO provisioning_classes VALUES(DEFAULT, '"..escape(class.value.class_group_id.value).."', '"..escape(class.value.label.value).."', '"..escape(class.value.seq.value).."')"
					runsqlcommand(sql, true)
					sql = "SELECT class_id FROM provisioning_classes WHERE class_group_id='"..escape(class.value.class_group_id.value).."' AND label='"..escape(class.value.label.value).."'"
					local tmp = getselectresponse(sql, true)
					if tmp and #tmp>0 then
						class.value.class_id.value = tmp[1].class_id
					end
				else
					sql = "UPDATE provisioning_classes SET (class_group_id, label, seq) = ('"..escape(class.value.class_group_id.value).."', '"..escape(class.value.label.value).."', '"..escape(class.value.seq.value).."') WHERE class_id='"..escape(class.value.class_id.value).."'"
					runsqlcommand(sql, true)
					sql = "DELETE FROM classes_to_param_groups WHERE class_id='"..escape(class.value.class_id.value).."'"
					runsqlcommand(sql, true)
				end
				-- Insert the class to group entries
				for n,g in pairs(class.value.groups.value) do
					if g.value ~= "" then
						sql = "INSERT INTO classes_to_param_groups VALUES('"..escape(class.value.class_id.value).."', '"..escape(g.value).."')"
						runsqlcommand(sql, true)
					end
				end

				sql = "COMMIT"
				runsqlcommand(sql)
			end
			if connected then databasedisconnect() end
		end)
		if not res and err then
			pcall(function() con:execute("ROLLBACK") end)
			success = false
			errtxt = err
		end
	end
	if not success then
		if create then
			class.errtxt = errtxt or "Failed to create class"
		else
			class.errtxt = errtxt or "Failed to save class"
		end
	end
	return class
end

delete_class = function(class_id)
	local result = ""
	local errtxt
       	local res, err = pcall(function()
		local connected = databaseconnect()
		local sql = "SELECT * FROM provisioning_classes WHERE class_id='"..escape(class_id).."'"
		local tmp = getselectresponse(sql)
		if #tmp == 0 then
			errtxt = "Class does not exist"
		else
			sql = "BEGIN TRANSACTION"
			runsqlcommand(sql)
			sql = "DELETE FROM classes_to_param_groups WHERE class_id='"..escape(class_id).."'"
			runsqlcommand(sql, true)
			sql = "DELETE FROM provisioning_classes WHERE class_id='"..escape(class_id).."'"
			runsqlcommand(sql, true)
			result = "Class Deleted"
			sql = "COMMIT"
			runsqlcommand(sql)
		end
		if connected then databasedisconnect() end
	end)
	if not res and err then
		pcall(function() con:execute("ROLLBACK") end)
		errtxt = err
	end

	return cfe({ value=result, errtxt=errtxt, label="Delete Class Result" })
end

list_groups = function()
	local retval = {}
	local errtxt
	-- Get the groups from the DB
        local res, err = pcall(function()
		local connected = databaseconnect()
		local sql = "SELECT * FROM provisioning_groups ORDER BY seq ASC, name ASC, label ASC"
		retval = getselectresponse(sql)
		if connected then databasedisconnect() end
	end)
	if not res and err then
		errtxt = err
	end

	return cfe({ type="structure", value=retval, label="List of Parameter Groups", errtxt=errtxt })
end

get_group = function(group_id)
	local retval = {}
	retval.group_id = cfe({value=group_id or "", label="Group ID", seq=1})
	retval.name = cfe({label="Name", seq=2})
	retval.label = cfe({label="Label", seq=3})
	retval.seq = cfe({label="Sequence", seq=4})
	retval.params = cfe({type="multi", value={}, label="Parameters", option={}, descr="Each selected parameter will be included in the group", seq=5})
	retval.editable = cfe({type="multi", value={}, label="Editable Parameters", option={}, descr="Each selected parameter will be user editable", seq=6})
	retval.default = cfe({type="multi", value={}, label="Parameters with defaults", option={}, descr="Each selected parameter will be have a default value for this group", seq=7})
	retval.defaults = cfe({type="group", value={}, label="Parameter Defaults", seq=8})
	local errtxt
	local res, err = pcall(function()
		local connected = databaseconnect()
		-- First, let's get all the parameters to set up the params.options and defaults
		local sql = "SELECT * FROM provisioning_params ORDER BY seq ASC, name ASC"
		local tmp = getselectresponse(sql)
		for i,p in ipairs(tmp) do
			retval.params.option[#retval.params.option + 1] = {value=p.param_id, label=p.label}
			retval.editable.option[#retval.editable.option + 1] = {value=p.param_id, label=p.label}
			retval.default.option[#retval.default.option + 1] = {value=p.param_id, label=p.label}
			p.seq = i
			if p.type == "select" then
				sql = "SELECT * FROM provisioning_options WHERE param_id='"..escape(p.param_id).."' ORDER BY seq ASC"
				p.option = getselectresponse(sql) or {}
			end
			if p.type == "boolean" then
				p.value = (p.value == "true")
			end
			retval.defaults.value[p.param_id] = p
		end
		if group_id and group_id ~= "" then
			sql = "SELECT * FROM provisioning_groups WHERE group_id='"..escape(group_id).."'"
			tmp = getselectresponse(sql)
			if tmp and #tmp > 0 then
				for n,v in pairs(tmp[1]) do
					if retval[n] then
						retval[n].value = v
					end
				end
			end
			-- Now, get the paramgroup-to-param mappings
			sql = "SELECT * FROM param_groups_to_params WHERE group_id="..escape(group_id)
			tmp = getselectresponse(sql)
			for i,p in ipairs(tmp) do
				retval.params.value[#retval.params.value + 1] = p.param_id
				if (p.editable == "t") then
					retval.editable.value[#retval.editable.value + 1] = p.param_id
				end
				if p.value then
					retval.default.value[#retval.default.value + 1] = p.param_id
				end
				if retval.defaults.value[p.param_id].type == "boolean" then
					retval.defaults.value[p.param_id].value = (p.value == "true")
				else
					retval.defaults.value[p.param_id].value = p.value
				end
			end
		end
		if connected then databasedisconnect() end
	end)
	if not res and err then
		errtxt = err
	end

	return cfe({ type="group", value=retval, label="Provisioning Parameter Group", errtxt=errtxt })
end

create_group = function(group)
	return update_group(group, true)
end

update_group = function(group, create)
	local success = true
	local errtxt
	-- Validate the settings
	success = modelfunctions.validatemulti(group.value.params) and success
	success = modelfunctions.validatemulti(group.value.editable) and success
	success = modelfunctions.validatemulti(group.value.default) and success
	if group.value.name.value == "" then
		success = false
		group.value.name.errtxt = "Cannot be blank"
	-- Group name cannot be device_id, name, or label or will mess up get_device_params
	elseif group.value.name.value == "device_id" or group.value.name.value == "name" or  group.value.name.value == "label" then 
		success = false
		group.value.name.errtxt = "Illegal name"
	elseif string.find(group.value.name.value, "%W") then
		success = false
		group.value.name.errtxt = "Must only contain alphanumeric characters"
	end
	if group.value.label.value == "" then
		success = false
		group.value.label.errtxt = "Cannot be blank"
	end
	if not validator.is_integer(group.value.seq.value) then
		success = false
		group.value.seq.errtxt = "Must be an integer"
	end
	-- Validate the param defaults
	for i,p in ipairs(group.value.default.value) do
		success = validateparam(group.value.defaults.value[p]) and success
	end
	if success then
        	local res, err = pcall(function()
			local connected = databaseconnect()
			if not create then
				local sql = "SELECT * FROM provisioning_groups WHERE group_id='"..escape(group.value.group_id.value).."'"
				local tmp = getselectresponse(sql)
				if not tmp or #tmp == 0 then
					success = false
					errtxt = "Group does not exist"
				end
			end
			if success then
				local sql = "BEGIN TRANSACTION"
				runsqlcommand(sql)
				if create then
					sql = "INSERT INTO provisioning_groups VALUES(DEFAULT, '"..escape(group.value.name.value).."', '"..escape(group.value.label.value).."', '"..escape(group.value.seq.value).."')"
					runsqlcommand(sql, true)
					sql = "SELECT group_id FROM provisioning_groups WHERE name='"..escape(group.value.name.value).."' AND label='"..escape(group.value.label.value).."'"
					local tmp = getselectresponse(sql, true)
					if tmp and #tmp>0 then
						group.value.group_id.value = tmp[1].group_id
					end
				else
					sql = "UPDATE provisioning_groups SET (name, label, seq) = ('"..escape(group.value.name.value).."', '"..escape(group.value.label.value).."', '"..escape(group.value.seq.value).."') WHERE group_id='"..escape(group.value.group_id.value).."'"
					runsqlcommand(sql, true)
					sql = "DELETE FROM param_groups_to_params WHERE group_id='"..escape(group.value.group_id.value).."'"
					runsqlcommand(sql, true)
				end
				-- Reverse the editable and default table for ease of use below
				local reverseeditable = {}
				for i,p in ipairs(group.value.editable.value) do
					reverseeditable[p] = i
				end
				local reversedefault = {}
				for i,p in ipairs(group.value.default.value) do
					reversedefault[p] = i
				end
				-- Insert the group to param entries
				for i,p in ipairs(group.value.params.value) do
					sql = "INSERT INTO param_groups_to_params VALUES('"..escape(group.value.group_id.value).."', '"..escape(p).."', "
					if reversedefault[p] then
						sql = sql.."'"..escape(tostring(group.value.defaults.value[p].value)).."'"
					else
						sql = sql.."null"
					end
					sql = sql..", '"..tostring(reverseeditable[p] ~= nil).."')"
					runsqlcommand(sql, true)
				end

				sql = "COMMIT"
				runsqlcommand(sql)
			end
			if connected then databasedisconnect() end
		end)
		if not res and err then
			pcall(function() con:execute("ROLLBACK") end)
			success = false
			errtxt = err
		end
	end
	if not success then
		if create then
			group.errtxt = errtxt or "Failed to create parameter group"
		else
			group.errtxt = errtxt or "Failed to save parameter group"
		end
	end
	return group
end

delete_group = function(group_id)
	local result = ""
	local errtxt
       	local res, err = pcall(function()
		local connected = databaseconnect()
		local sql = "SELECT * FROM provisioning_groups WHERE group_id='"..escape(group_id).."'"
		local tmp = getselectresponse(sql)
		if #tmp == 0 then
			errtxt = "Group does not exist"
		else
			sql = "BEGIN TRANSACTION"
			runsqlcommand(sql)
			sql = "DELETE FROM param_groups_to_params WHERE group_id='"..escape(group_id).."'"
			runsqlcommand(sql, true)
			sql = "DELETE FROM provisioning_groups WHERE group_id='"..escape(group_id).."'"
			runsqlcommand(sql, true)
			result = "Parameter Group Deleted"
			sql = "COMMIT"
			runsqlcommand(sql)
		end
		if connected then databasedisconnect() end
	end)
	if not res and err then
		pcall(function() con:execute("ROLLBACK") end)
		errtxt = err
	end

	return cfe({ value=result, errtxt=errtxt, label="Delete Parameter Group Result" })
end

list_params = function()
	local retval = {}
	local errtxt
	-- Get the params from the DB
        local res, err = pcall(function()
		local connected = databaseconnect()
		local sql = "SELECT * FROM provisioning_params ORDER BY seq ASC, name ASC, label ASC"
		retval = getselectresponse(sql)
		if connected then databasedisconnect() end
	end)
	if not res and err then
		errtxt = err
	end

	return cfe({ type="structure", value=retval, label="List of Parameters", errtxt=errtxt })
end

get_param = function(param_id)
	local retval = {}
	retval.param_id = cfe({value=param_id or "", label="Param ID", seq=1})
	retval.name = cfe({label="Name", seq=2})
	retval.type = cfe({type="select", label="Type", option={"text", "boolean", "select"}, seq=3})
	retval.label = cfe({label="Label", seq=4})
	retval.descr = cfe({label="Description", seq=5})
	retval.value = cfe({label="Default Value", descr="Warning, this value is not validated", seq=6})
	retval.regexp = cfe({label="Regular Expression", descr="Lua regular expression for validating the text parameter value", seq=7})
	retval.validate = cfe({type="longtext", label="Validation Code", descr="Lua code to validate the parameter value. Returns updated value and error text. Not used to validate group defaults.", seq=8})
	retval.seq = cfe({label="Sequence", seq=9})
	local errtxt
	local res, err = pcall(function()
		local connected = databaseconnect()
		if param_id and param_id ~= "" then
			sql = "SELECT * FROM provisioning_params WHERE param_id='"..escape(param_id).."'"
			tmp = getselectresponse(sql)
			if tmp and #tmp > 0 then
				for n,v in pairs(tmp[1]) do
					if retval[n] then
						retval[n].value = v
					end
				end
			end
		end
		if connected then databasedisconnect() end
	end)
	if not res and err then
		errtxt = err
	end

	return cfe({ type="group", value=retval, label="Provisioning Parameter", errtxt=errtxt })
end

create_param = function(param)
	return update_param(param, true)
end

update_param = function(param, create)
	local success = true
	local errtxt
	-- Validate the settings
	success = modelfunctions.validateselect(param.value.type)
	if param.value.name.value == "" then
		success = false
		param.value.name.errtxt = "Cannot be blank"
	end
	if param.value.label.value == "" then
		success = false
		param.value.label.errtxt = "Cannot be blank"
	end
	if not validator.is_integer(param.value.seq.value) then
		success = false
		param.value.seq.errtxt = "Must be an integer"
	end
	local s,e = validateluacode(param.value.validate.value)
	if not s then
		success = false
		param.value.validate.errtxt = "Invalid Lua code"
		if e and e ~= "" then
			param.value.validate.errtxt = param.value.validate.errtxt.."\n"..e
		end
	end
	if success then
        	local res, err = pcall(function()
			local connected = databaseconnect()
			if not create then
				local sql = "SELECT * FROM provisioning_params WHERE param_id='"..escape(param.value.param_id.value).."'"
				local tmp = getselectresponse(sql)
				if not tmp or #tmp == 0 then
					success = false
					errtxt = "Param does not exist"
				end
			end
			if success then
				local sql = "BEGIN TRANSACTION"
				runsqlcommand(sql)
				if create then
					sql = "INSERT INTO provisioning_params VALUES(DEFAULT, '"..escape(param.value.name.value).."', '"..escape(param.value.type.value).."', '"..escape(param.value.label.value).."', '"..escape(param.value.descr.value).."', '"..escape(param.value.value.value).."', '"..escape(param.value.seq.value).."', '"..escape(param.value.regexp.value).."', '"..escape(format.dostounix(param.value.validate.value)).."')"
					runsqlcommand(sql, true)
					sql = "SELECT param_id FROM provisioning_params WHERE name='"..escape(param.value.name.value).."' AND label='"..escape(param.value.label.value).."'"
					local tmp = getselectresponse(sql, true)
					if tmp and #tmp>0 then
						param.value.param_id.value = tmp[1].param_id
					end
				else
					sql = "UPDATE provisioning_params SET (name, type, label, descr, value, seq, regexp, validate) = ('"..escape(param.value.name.value).."', '"..escape(param.value.type.value).."', '"..escape(param.value.label.value).."', '"..escape(param.value.descr.value).."', '"..escape(param.value.value.value).."', '"..escape(param.value.seq.value).."', '"..escape(param.value.regexp.value).."', '"..escape(format.dostounix(param.value.validate.value)).."') WHERE param_id='"..escape(param.value.param_id.value).."'"
					runsqlcommand(sql, true)
				end

				sql = "COMMIT"
				runsqlcommand(sql)
			end
			if connected then databasedisconnect() end
		end)
		if not res and err then
			pcall(function() con:execute("ROLLBACK") end)
			success = false
			errtxt = err
		end
	end
	if not success then
		if create then
			param.errtxt = errtxt or "Failed to create parameter"
		else
			param.errtxt = errtxt or "Failed to save parameter"
		end
	end
	return param
end

delete_param = function(param_id)
	local result = ""
	local errtxt
       	local res, err = pcall(function()
		local connected = databaseconnect()
		local sql = "SELECT * FROM provisioning_params WHERE param_id='"..escape(param_id).."'"
		local tmp = getselectresponse(sql)
		if #tmp == 0 then
			errtxt = "Parameter does not exist"
		else
			sql = "BEGIN TRANSACTION"
			runsqlcommand(sql)
			sql = "DELETE FROM provisioning_params WHERE param_id='"..escape(param_id).."'"
			runsqlcommand(sql, true)
			sql = "DELETE FROM provisioning_options WHERE param_id='"..escape(param_id).."'"
			runsqlcommand(sql, true)
			result = "Parameter Deleted"
			sql = "COMMIT"
			runsqlcommand(sql)
		end
		if connected then databasedisconnect() end
	end)
	if not res and err then
		pcall(function() con:execute("ROLLBACK") end)
		errtxt = err
	end

	return cfe({ value=result, errtxt=errtxt, label="Delete Parameter Result" })
end

list_devices = function()
	local retval = {}
	local errtxt
	-- Get the devices from the DB
        local res, err = pcall(function()
		local connected = databaseconnect()
		local sql = "SELECT device_id, c.label AS class, g.label AS group FROM devices_to_classes d2c JOIN provisioning_classes c USING(class_id) JOIN provisioning_class_groups g USING(class_group_id) ORDER BY device_id"
		local tmp = getselectresponse(sql)
		local reverse_device_id = {}
		for i,d in ipairs(tmp) do
			if not reverse_device_id[d.device_id] then
				retval[#retval+1] = {device_id=d.device_id}
				reverse_device_id[d.device_id] = #retval
			end
			retval[reverse_device_id[d.device_id]][d.group] = d.class
		end
		if connected then databasedisconnect() end
	end)
	if not res and err then
		errtxt = err
	end

	return cfe({ type="structure", value=retval, label="List of Devices", errtxt=errtxt })
end

get_device = function(device_id)
	local retval = {}
	retval.device_id = cfe({value=device_id or "", label="Device ID", seq=1})
	retval.classes = cfe({type="group", value={}, label="Classes", seq=2})
	local errtxt
	local res, err = pcall(function()
		local classes={}
		local connected = databaseconnect()
		if device_id and device_id ~= "" then
			-- Get the device-to-class mappings
			local sql = "SELECT class_id FROM devices_to_classes WHERE device_id="..escape(device_id)
			local tmp = getselectresponse(sql)
			for i,g in ipairs(tmp) do
				classes[g.class_id] = true
			end
		end
		-- Finally, get the class options
		sql = "SELECT class_id, g.name, g.label AS group, c.label, c.seq FROM provisioning_classes c JOIN provisioning_class_groups g USING(class_group_id) ORDER BY g.seq ASC, g.label ASC, c.seq ASC, c.label ASC"
		tmp = getselectresponse(sql)
		for i,c in ipairs(tmp) do
			if not retval.classes.value[c.name] then
				retval.classes.value[c.name] = cfe({type="select", label=c.group, option={{value="", label=""}}, seq=i})
			end
			local class = retval.classes.value[c.name]
			class.option[#class.option + 1] = {value=c.class_id, label=c.label}
			if classes[c.class_id] then
				class.value = c.class_id
			end
		end
		if connected then databasedisconnect() end
	end)
	if not res and err then
		errtxt = err
	end

	-- Save the device for later use
	local output = cfe({ type="group", value=retval, label="Provisioning Device", errtxt=errtxt })
	if device_id and device_id ~= "" then saved_devices[device_id] = duplicatestructure(output) end
	return output
end

create_device = function(device)
	return update_device(device, true)
end

update_device = function(device, create)
	local success = true
	local errtxt
	-- Validate the settings
	local something = false
	for n,c in pairs(device.value.classes.value) do
		success = modelfunctions.validateselect(c) and success
		if c.value ~= "" then something = true end
	end
	if not something then
		success = false
	end
	if success then
        	local res, err = pcall(function()
			local connected = databaseconnect()
			if not create then
				local sql = "SELECT * FROM devices_to_classes WHERE device_id='"..escape(device.value.device_id.value).."' LIMIT 1"
				local tmp = getselectresponse(sql)
				if not tmp or #tmp == 0 then
					success = false
					device.value.device_id.errtxt = "Device does not exist"
				end
			end
			if success then
				if not saved_devices[device.value.device_id.value] then get_device(device.value.device_id.value) end
				if not saved_device_params[device.value.device_id.value] then get_device_params(device.value.device_id.value) end

				local sql = "BEGIN TRANSACTION"
				runsqlcommand(sql)
				if create then
					sql = "SELECT nextval('provisioning_device_seq')"
					local tmp = getselectresponse(sql, true)
					if tmp and #tmp>0 then
						device.value.device_id.value = tmp[1].nextval
					end
				end
				sql = "DELETE FROM devices_to_classes WHERE device_id='"..escape(device.value.device_id.value).."'"
				runsqlcommand(sql, true)
				-- Insert the device to class entries
				for n,c in pairs(device.value.classes.value) do
					if c.value ~= "" then
						sql = "INSERT INTO devices_to_classes VALUES('"..escape(device.value.device_id.value).."', '"..escape(c.value).."')"
						runsqlcommand(sql, true)
					end
				end

				sql = "COMMIT"
				runsqlcommand(sql)

				local s = saved_device_params[device.value.device_id.value]
				callscript(updatedevicescriptfile, device, saved_devices[device.value.device_id.value], get_device_params(device.value.device_id.value), s)
				saved_devices[device.value.device_id.value] = device
			end
			if connected then databasedisconnect() end
		end)
		if not res and err then
			pcall(function() con:execute("ROLLBACK") end)
			success = false
			errtxt = err
		end
	end
	if not success then
		if create then
			device.errtxt = errtxt or "Failed to create device"
		else
			device.errtxt = errtxt or "Failed to save device"
		end
	end
	return device
end

delete_device = function(device_id)
	local result = ""
	local errtxt
       	local res, err = pcall(function()
		local connected = databaseconnect()
		local sql = "SELECT * FROM devices_to_classes WHERE device_id='"..escape(device_id).."' LIMIT 1"
		local tmp = getselectresponse(sql)
		if #tmp == 0 then
			errtxt = "Device does not exist"
		else
			if not saved_device_params[device_id] then get_device_params(device_id) end
			if not saved_devices[device_id] then get_device(device_id) end
			
			sql = "BEGIN TRANSACTION"
			runsqlcommand(sql)
			sql = "DELETE FROM provisioning_values WHERE device_id='"..escape(device_id).."'"
			runsqlcommand(sql, true)
			sql = "DELETE FROM devices_to_classes WHERE device_id='"..escape(device_id).."'"
			runsqlcommand(sql, true)
			result = "Device Deleted"
			sql = "COMMIT"
			runsqlcommand(sql)

			callscript(deletedevicescriptfile, saved_devices[device_id], saved_device_params[device_id])
			saved_devices[device_id] = nil
			saved_device_params[device_id] = nil
		end
		if connected then databasedisconnect() end
	end)
	if not res and err then
		pcall(function() con:execute("ROLLBACK") end)
		errtxt = err
	end

	return cfe({ value=result, errtxt=errtxt, label="Delete Device Result" })
end

get_editable_device_params = function(device_id)
	return get_device_params(device_id, true)
end

get_device_params = function(device_id, editable)
	local retval = {}
	retval.device_id = cfe({value=device_id or "", label="Device ID", seq=0})
	local errtxt = "Cannot find device"
	if device_id and device_id ~= "" then
		local res, err = pcall(function()
			local connected = databaseconnect()
			-- First, just check to see if device_id exists
			local sql = "SELECT * FROM devices_to_classes WHERE device_id='"..escape(device_id).."' LIMIT 1"
			local tmp = getselectresponse(sql)
			if tmp and #tmp > 0 then
				errtxt = nil
				-- Next, get all of the param groups
				sql = "SELECT * FROM provisioning_groups"
				local tmp = getselectresponse(sql)
				-- Loop through the groups and put them into the result
				for i,g in ipairs(tmp) do
					retval[g.name] = g
					retval[g.name].label = g.name
					retval[g.name].type="group"
				end
				-- Then, get all of the parameters for this device
				sql = "SELECT g.name AS group, g.label AS grouplabel, p.param_id, p.name, p.type, p.label, p.descr, p.seq, p.regexp, p.validate, CASE WHEN v.value IS NOT NULL THEN v.value WHEN g2p.value IS NOT NULL THEN g2p.value ELSE p.value END AS value, CASE WHEN g2p.value IS NOT NULL THEN g2p.value ELSE p.value END AS default "..
					"FROM (devices_to_classes d2t JOIN provisioning_classes t USING(class_id) JOIN classes_to_param_groups t2g USING (class_id) JOIN provisioning_groups g USING(group_id) "..
						"JOIN param_groups_to_params g2p USING(group_id) JOIN provisioning_params p USING(param_id)) LEFT JOIN provisioning_values v ON(d2t.device_id=v.device_id AND p.param_id=v.param_id AND g.name=v.group_name ) "..
					"WHERE d2t.device_id='"..escape(device_id).."'"
				if editable then
					sql = sql.." AND g2p.editable='t'"
				end
				local tmp = getselectresponse(sql)
				-- Loop through the params to figure out options and put them into the groups
				for i,p in ipairs(tmp) do
					-- Options
					if (p.type == "select") then
						sql = "SELECT * FROM provisioning_options WHERE param_id='"..escape(p.param_id).."' ORDER BY seq ASC"
						p.option = getselectresponse(sql) or {}
					end
					-- Groups
					if not retval[p.group].value then
						retval[p.group].value = {}
					end
					retval[p.group].label = p.grouplabel
					local value = retval[p.group].value
					if p.type == "boolean" then
						p.value = (p.value == "true")
					end
					value[p.name] = p
				end
				-- Finally, loop through the result and remove empty groups
				for name,val in pairs(retval) do
					if not val.value then
						retval[name] = nil
					end
				end
			end
			if connected then databasedisconnect() end
		end)
		if not res and err then
			errtxt = err
		end
	end

	-- Save the device for later use
	local output = cfe({ type="group", value=retval, label="Provisioning Device Parameters", errtxt=errtxt })
	if device_id and device_id ~= "" and not editable then saved_device_params[device_id] = duplicatestructure(output) end
	return output
end

get_class_options = function(class_id)
	local retval = {}
	retval.class_id = cfe({value=class_id or "", label="Class ID", seq=1})
	return cfe({ type="group", value=retval, label="Provisioning Class Values" })
end

get_class_values = function(retval)
	retval.errtxt = "Failed to find class"
	if not validator.is_integer(retval.value.class_id.value) then
		retval.value.class_id.errtxt = "Invalid class ID"
	else
		local res, err = pcall(function()
			local connected = databaseconnect()
			-- First, just check to see if class_id exists
			local sql = "SELECT * FROM provisioning_classes WHERE class_id='"..escape(retval.value.class_id.value).."'"
			local tmp = getselectresponse(sql)
			if tmp and #tmp > 0 then
				retval.errtxt = nil
				retval.value.label = cfe({ value=tmp[1].label or "", label="Label", seq=3})
				retval.value.values = cfe({type="structure", value={}, label="Parameter Values"})
					
				local sql = "SELECT g.name AS group, p.name, p.type, CASE WHEN g2p.value IS NOT NULL THEN g2p.value ELSE p.value END AS value "..
					"FROM (provisioning_classes t JOIN classes_to_param_groups t2g USING(class_id) JOIN provisioning_groups g USING(group_id) "..
						"JOIN param_groups_to_params g2p USING(group_id) JOIN provisioning_params p USING(param_id)) "..
					"WHERE t.class_id='"..escape(retval.value.class_id.value).."'"
				local tmp = getselectresponse(sql)
				-- Loop through the params and put them into the groups
				for i,p in ipairs(tmp) do
					if p.type == "boolean" then
						p.value = (p.value == "true")
					end
					if not retval.value.values.value[p.group] then
						retval.value.values.value[p.group] = {}
					end
					retval.value.values.value[p.group][p.name] = p.value
				end
			else
				retval.value.class_id.errtxt = "Failed to find Class ID"
			end
			if connected then databasedisconnect() end
		end)
		if not res and err then
			retval.errtxt = err
		end
	end

	return retval
end

set_editable_device_params = function(params)
	return set_device_params(params, true)
end

set_device_params = function(params, editable)
	-- Validate the settings
	local success = validateparam(params)
	local errtxt
	if success then
        	local res, err = pcall(function()
			local connected = databaseconnect()
			success = validateparamcoded(params)
			if not create then
				local sql = "SELECT * FROM devices_to_classes WHERE device_id='"..escape(params.value.device_id.value).."' LIMIT 1"
				local tmp = getselectresponse(sql)
				if not tmp or #tmp == 0 then
					success = false
					errtxt = "Device does not exist"
				end
			end
			if success then
				if not saved_device_params[params.value.device_id.value] then get_device_params(params.value.device_id.value) end

				local sql = "BEGIN TRANSACTION"
				runsqlcommand(sql)
				if not editable then
					-- Delete all values for this device (can't do this if only updating editable)
					sql = "DELETE FROM provisioning_values WHERE device_id='"..escape(params.value.device_id.value).."'"
					runsqlcommand(sql, true)
				end
				-- Loop through the groups and params
				for group,v in pairs(params.value) do
					if v.type == "group" then
						for name,param in pairs(v.value) do
							if editable then
								sql = "DELETE FROM provisioning_values WHERE device_id='"..escape(params.value.device_id.value).."' AND group_name='"..escape(group).."' AND param_id='"..escape(param.param_id).."'"
								runsqlcommand(sql, true)
							end
							if tostring(param.value) ~= param.default then
								sql = "INSERT INTO provisioning_values VALUES('"..escape(params.value.device_id.value).."', '"..escape(group).."', '"..escape(param.param_id).."', '"..escape(tostring(param.value)).."')"
								runsqlcommand(sql, true)
							end
						end
					end
				end

				sql = "COMMIT"
				runsqlcommand(sql)
				
				local tmp = saved_device_params[params.value.device_id.value]
				local p = params
				if not editable then
					saved_device_params[params.value.device_id.value] = params
				else
					p = get_device_params(params.value.device_id.value)
				end
				callscript(updatedeviceparamsscriptfile, p, tmp)
			end
			if connected then databasedisconnect() end
		end)
		if not res and err then
			pcall(function() con:execute("ROLLBACK") end)
			success = false
			errtxt = err
		end
	end
	if not success then
		params.errtxt = errtxt or "Failed to save device parameters"
	end
	return params
end

fetch_device_values = function(search)
	local res, err = pcall(function()
		local connected = databaseconnect()
		search = search_device_values(search)
		if search.errtxt then
			-- Just return the error
		elseif #search.value.result.value == 0 then
			search.errtxt = "Device not found"
		elseif #search.value.result.value > 1 then
			search.errtxt = "Multiple devices found"
		else
			search.value.values = get_device_values(search.value.result.value[1].device_id)
			search.value.values.seq = 5
		end
		if connected then databasedisconnect() end
	end)
	if not res and err then
		search.errtxt = err
	end

	search.label="Provisioning Device Parameter Values"
	return search
end

get_device_values = function(device_id)
	local retval = {}
	local errtxt
	if device_id and device_id ~= "" then
		local res, err = pcall(function()
			local connected = databaseconnect()
			local sql = "SELECT g.name AS group, p.name, p.type, CASE WHEN v.value IS NOT NULL THEN v.value WHEN g2p.value IS NOT NULL THEN g2p.value ELSE p.value END AS value "..
				"FROM (devices_to_classes d2t JOIN provisioning_classes t USING(class_id) JOIN classes_to_param_groups t2g USING(class_id) JOIN provisioning_groups g USING(group_id) "..
					"JOIN param_groups_to_params g2p USING(group_id) JOIN provisioning_params p USING(param_id)) LEFT JOIN provisioning_values v ON(d2t.device_id=v.device_id AND p.param_id=v.param_id AND g.name=v.group_name ) "..
				"WHERE d2t.device_id='"..escape(device_id).."'"
			local tmp = getselectresponse(sql)
			-- Loop through the params and put them into the groups
			for i,p in ipairs(tmp) do
				if p.type == "boolean" then
					p.value = (p.value == "true")
				end
				if not retval[p.group] then
					retval[p.group] = {}
				end
				retval[p.group][p.name] = p.value
			end
			if connected then databasedisconnect() end
		end)
		if not res and err then
			errtxt = err
		end
	else
		errtxt = "Invalid device id"
	end

	return cfe({type="structure", value=retval, label="Parameter Values", errtxt=errtxt})
end

get_search_options = function()
	local errtxt
	retval = {}
	retval.id = cfe({type="select", value="device_id", label="Parameter", option={"device_id"}, seq=1})
	retval.comparison = cfe({type="select", value="=", label="Comparison", option={"=", "!=", "~", "!~", "~*", "!~*"}, seq=2})
	retval.value = cfe({label="Parameter Value", descr="Parameter value or SQL regular expression", seq=3})
        local res, err = pcall(function()
		local connected = databaseconnect()
		-- Get the group/parameter options
		local sql = "SELECT g.name AS group_name, p.name AS param_name FROM provisioning_groups g JOIN param_groups_to_params USING(group_id) JOIN provisioning_params p USING(param_id) GROUP BY g.name, p.name ORDER BY g.name ASC, p.name ASC"
		local tmp = getselectresponse(sql)
		local blankopt = {}
		local blankexists = {}
		for i,v in ipairs(tmp) do
			retval.id.option[#retval.id.option + 1] = v.group_name.."."..v.param_name
			if not blankexists[v.param_name] then
				blankopt[#blankopt+1] = "."..v.param_name
				blankexists[v.param_name] = true
			end
		end
		table.sort(blankopt)
		for i,o in ipairs(blankopt) do
			retval.id.option[#retval.id.option + 1] = o
		end
		if connected then databasedisconnect() end
	end)
	if not res and err then
		errtxt = err
	end
	return cfe({type="group", value=retval, label="Device Search", errtxt=errtxt})
end

search_device_values = function(search)
	local success = true
	success = modelfunctions.validateselect(search.value.id) and success
	success = modelfunctions.validateselect(search.value.comparison) and success
	if search.value.id.value == "device_id" then
		if string.match(search.value.comparison.value, "~") then
			success = false
			search.value.comparison.errtxt = "Cannot do regular expression comparison to device_id"
		end
		if not validator.is_integer(search.value.value.value) then
			success = false
			search.value.value.errtxt = "Must be an integer for comparison to device_id"
		end
	end
	if success then
		retval.result = cfe({type="structure", value={}, label="List of Devices", seq=4 })
        	local res, err = pcall(function()
			local connected = databaseconnect()
			-- Get the devices from the DB
			sql = "SELECT d2t.device_id, "
			local group, param = string.match(search.value.id.value, "([^%.]*)%.(.*)")
			if not group then
				sql = sql.."'"..search.value.id.value.."' AS param, d2t."..search.value.id.value.." AS value FROM devices_to_classes d2t WHERE d2t."..search.value.id.value..
					search.value.comparison.value.."'"..escape(search.value.value.value).."' GROUP BY device_id"
			else
				sql = sql.."g.name as group, p.name as param, CASE WHEN v.value IS NOT NULL THEN v.value WHEN g2p.value IS NOT NULL THEN g2p.value ELSE p.value END as value FROM "..
					"devices_to_classes d2t JOIN provisioning_classes t USING(class_id) JOIN classes_to_param_groups t2g USING(class_id) "..
					"JOIN provisioning_groups g USING(group_id) JOIN param_groups_to_params g2p USING(group_id) JOIN provisioning_params p USING(param_id) "..
					"LEFT JOIN provisioning_values v ON(d2t.device_id=v.device_id AND p.param_id=v.param_id AND g.name=v.group_name ) "
				if group and group ~= "" then
					sql = sql.."WHERE g.name='"..escape(group).."' AND"
				else
					sql = sql.."WHERE"
				end
				sql = sql.." p.name='"..escape(param).."' AND CASE WHEN v.value IS NOT NULL THEN v.value WHEN g2p.value IS NOT NULL THEN g2p.value ELSE p.value END"..search.value.comparison.value.."'"..escape(search.value.value.value).."'"
			end
			sql = sql.." ORDER BY d2t.device_id ASC"
			search.value.result.value = getselectresponse(sql)
			if connected then databasedisconnect() end
		end)
		if not res and err then
			search.errtxt = err
		end
	else
		search.errtxt = "Search failed"
	end
	return search
end

get_param_options = function(param_id)
	local retval = {}
	retval.param_id = cfe({value=param_id or "", label="Parameter ID", seq=0})
	retval.name = cfe({label="Name", seq=1})
	retval.label = cfe({label="Label", seq=2})
	retval.options = cfe({type="list", value={}, label="Value Options", descr="Ordered list of options where each option is made up of 'value' or 'value,label'", seq=3})
	local errtxt = "Cannot find parameter"
	if param_id and param_id ~= "" then
		local res, err = pcall(function()
			local connected = databaseconnect()
			-- First, just check to see if param_id exists
			local sql = "SELECT * FROM provisioning_params WHERE param_id='"..escape(param_id).."'"
			local tmp = getselectresponse(sql)
			if tmp and #tmp > 0 then
				errtxt = nil
				retval.name.value = tmp[1].name
				retval.label.value = tmp[1].label
				-- Next, get all of the param options
				sql = "SELECT * FROM provisioning_options WHERE param_id='"..escape(param_id).."' ORDER BY seq ASC"
				local tmp = getselectresponse(sql) or {}
				for i,t in ipairs(tmp) do
					retval.options.value[#retval.options.value + 1] = t.value..","..t.label
				end
			end
			if connected then databasedisconnect() end
		end)
		if not res and err then
			errtxt = err
		end
	end
	return cfe({ type="group", value=retval, label="Provisioning Parameter Options", errtxt=errtxt })
end

set_param_options = function(options)
	local success = true
	local errtxt
	-- Validate the settings
--FIXME
	if success then
        	local res, err = pcall(function()
			local connected = databaseconnect()
			local sql = "SELECT * FROM provisioning_params WHERE param_id='"..escape(options.value.param_id.value).."'"
			local tmp = getselectresponse(sql)
			if not tmp or #tmp == 0 then
				success = false
				errtxt = "Parameter does not exist"
			end
			if success then
				local sql = "BEGIN TRANSACTION"
				runsqlcommand(sql)
				-- Delete all options for this device
				sql = "DELETE FROM provisioning_options WHERE param_id='"..escape(options.value.param_id.value).."'"
				runsqlcommand(sql, true)
				-- Loop through the options
				for i,o in ipairs(options.value.options.value) do
					local v,l = string.match(o, "^%s*([^,]+),%s*(.*%S)%s*$")
					if v then
						v = string.match(v, "^(.*%S)%s*$")
					else
						v = string.match(o, "^%s*(.*%S)%s*$")
						l = v
					end
					sql = "INSERT INTO provisioning_options VALUES('"..escape(options.value.param_id.value).."', '"..escape(l).."', '"..escape(v).."', '"..i.."')"
					runsqlcommand(sql, true)
				end
				sql = "COMMIT"
				runsqlcommand(sql)
			end
			if connected then databasedisconnect() end
		end)
		if not res and err then
			pcall(function() con:execute("ROLLBACK") end)
			success = false
			errtxt = err
		end
	end
	if not success then
		options.errtxt = errtxt or "Failed to save options"
	end
	return options
end

function get_filedetails(filename)
	return modelfunctions.getfiledetails(filename, scriptfiles)
end

function update_filedetails(filedetails)
	return modelfunctions.setfiledetails(filedetails, scriptfiles)
end

function list_files()
	local retval = {}
	for i,file in ipairs(scriptfiles) do
		local details = fs.stat(file) or {}
		details.filename = file
		table.insert(retval, details)
	end
	table.sort(retval, function(a,b) return a.filename < b.filename end)
	return cfe({ type="structure", value=retval, label="List of Provisioning Script files" })
end

function get_database()
	local devices = cfe({ type="boolean", value=false, label="Include Device Data" })
	return cfe({ type="group", value={devices=devices}, label="Provisioning Database Dump" })
end

function dump_database(db)
	local res, err = pcall(function()
		local connected = databaseconnect()
		local lines = {}
		local sql = "SELECT name, label, seq FROM provisioning_class_groups ORDER BY name, label"
		local tmp = getselectresponse(sql)
		for i,t in ipairs(tmp) do
			lines[#lines+1] = "INSERT INTO provisioning_class_groups VALUES(default, '"..escape(t.name).."', '"..escape(t.label).."', '"..escape(t.seq).."');"
		end
		sql = "SELECT g.name AS group, c.label, c.seq FROM provisioning_classes c JOIN provisioning_class_groups g USING(class_group_id) ORDER BY g.name, c.label"
		tmp = getselectresponse(sql)
		for i,t in ipairs(tmp) do
			lines[#lines+1] = "INSERT INTO provisioning_classes VALUES(default, (SELECT class_group_id FROM provisioning_class_groups WHERE name='"..escape(t.group).."'), '"..escape(t.label).."', '"..escape(t.seq).."');"
		end
		sql = "SELECT name, label, seq FROM provisioning_groups ORDER BY name, label"
		tmp = getselectresponse(sql)
		for i,t in ipairs(tmp) do
			lines[#lines+1] = "INSERT INTO provisioning_groups VALUES(default, '"..escape(t.name).."', '"..escape(t.label).."', '"..escape(t.seq).."');"
		end
		sql = "SELECT name, type, label, descr, value, seq, regexp, validate FROM provisioning_params ORDER BY name"
		tmp = getselectresponse(sql)
		for i,t in ipairs(tmp) do
			lines[#lines+1] = "INSERT INTO provisioning_params VALUES(default, '"..escape(t.name).."', '"..escape(t.type).."', '"..escape(t.label).."', '"..escape(t.descr).."', '"..escape(t.value).."', '"..escape(t.seq).."', '"..escape(t.regexp).."', '"..escape(t.validate).."');"
		end
		sql = "SELECT p.name AS param, o.label, o.value, o.seq FROM provisioning_options o JOIN provisioning_params p USING(param_id) ORDER BY p.name, o.seq, o.label"
		tmp = getselectresponse(sql)
		for i,t in ipairs(tmp) do
			lines[#lines+1] = "INSERT INTO provisioning_options VALUES((SELECT param_id FROM provisioning_params WHERE name='"..escape(t.param).."'), '"..escape(t.label).."', '"..escape(t.value).."', '"..escape(t.seq).."');"
		end
		sql = "SELECT c.label AS class, g.label AS group FROM provisioning_classes c JOIN classes_to_param_groups USING(class_id) JOIN provisioning_groups g USING(group_id) ORDER BY c.label, g.label"
		tmp = getselectresponse(sql)
		for i,t in ipairs(tmp) do
			lines[#lines+1] = "INSERT INTO classes_to_param_groups VALUES((SELECT class_id FROM provisioning_classes WHERE label='"..escape(t.class).."'), (SELECT group_id FROM provisioning_groups WHERE label='"..escape(t.group).."'));"
		end
		sql = "SELECT p.name AS param, g.label AS group, t.value, t.editable FROM provisioning_params p JOIN param_groups_to_params t USING(param_id) JOIN provisioning_groups g USING(group_id) ORDER BY p.name, g.label"
		tmp = getselectresponse(sql)
		for i,t in ipairs(tmp) do
			lines[#lines+1] = "INSERT INTO param_groups_to_params VALUES((SELECT group_id FROM provisioning_groups WHERE label='"..escape(t.group).."'), (SELECT param_id FROM provisioning_params WHERE name='"..escape(t.param).."'), '"..escape(t.value).."', '"..escape(t.editable).."');"
		end
		if db.value.devices and db.value.devices.value then
			sql = "SELECT device_id FROM devices_to_classes GROUP BY device_id ORDER BY device_id ASC"
			devices = getselectresponse(sql)
			for i,d in ipairs(devices) do
				sql = "SELECT label FROM devices_to_classes JOIN provisioning_classes USING(class_id) WHERE device_id="..escape(d.device_id)
				tmp = getselectresponse(sql)
				for j,t in ipairs(tmp) do
					lines[#lines+1] = "INSERT INTO devices_to_classes VALUES("..i..", (SELECT class_id FROM provisioning_classes WHERE label='"..escape(t.label).."'));"
				end
				sql = "SELECT group_name, p.name AS param, v.value FROM provisioning_values v JOIN provisioning_params p USING(param_id) WHERE device_id="..escape(d.device_id)
				tmp = getselectresponse(sql)
				for j,t in ipairs(tmp) do
					lines[#lines+1] = "INSERT INTO provisioning_values VALUES("..i..", '"..escape(t.group_name).."', (SELECT param_id FROM provisioning_params WHERE name='"..escape(t.param).."'), '"..t.value.."');"
				end
			end
			lines[#lines+1] = "SELECT pg_catalog.setval('provisioning_device_seq', "..#devices..", true);"
		end
		db.value.data = cfe({ type="longtext", value=table.concat(lines, "\n") or "", label="Database Values" })
		if connected then databasedisconnect() end
	end)
	if not res and err then
		db.errtxt = err
	end
	return db
end

function get_file(mac, ip, agent)
	local result = cfe()

	-- Error if there's no mac
	if not mac or mac == "" then
		result.errtxt = "No MAC Address"
		return result
	end

	local res, err = pcall(function()
		local connected = databaseconnect()

		-- Add the device to the table of requests
		local sql = "SELECT * FROM provisioning_requests WHERE mac='"..escape(string.upper(mac)).."'"
		local requests = getselectresponse(sql)
		if requests and #requests > 0 then
			sql = "UPDATE provisioning_requests SET ip='"..escape(ip).."', agent='"..escape(agent).."', date=now() WHERE mac='"..escape(string.upper(mac)).."'"
		else
			sql = "INSERT INTO provisioning_requests VALUES('"..escape(string.upper(mac)).."', '"..escape(ip).."', '"..escape(agent).."', now())"
		end
		runsqlcommand(sql)

		-- Now, let's see if this device exists
		result = get_search_options()
		result.value.id.value = "device.mac"
		result.value.value.value = string.upper(mac)
		result = fetch_device_values(result)

		-- If can't find the device, return a file with default settings
		if #result.value.result.value == 0 then
			-- Determine which class to use (need a class that specifies a template)
			local c = list_classes()
			local class = callscript(determineclassscriptfile, agent, c)

			if class then
				local options = get_class_options()
				options.value.class_id.value = class
				result = get_class_values(options)
			else
				result.errtxt = "Unknown device"
			end
		end

		if connected then databasedisconnect() end
	end)
	if not res and err then
		result.errtxt = err
	end

	return result
end

function put_file(mac, data)
	local retval = cfe({ label="PUT Data" })
	
	-- Error if there's no mac
	if not mac or mac == "" then
		retval.errtxt = "No MAC Address"
		return retval
	end

	local res, err = pcall(function()
		local connected = databaseconnect()
		
		-- Now, let's see if this device exists
		local search = get_search_options()
		search.value.id.value = "device.mac"
		search.value.value.value = string.upper(mac)
		search = search_device_values(search)
		if search.errtxt then
			retval.errtxt = search.errtxt
		elseif #search.value.result.value == 0 then
			retval.errtxt = "Device not found"
		elseif #search.value.result.value > 1 then
			retval.errtxt = "Multiple devices found"
		else
			retval.value, retval.errtxt = callscript(processputscriptfile, mac, data, search.value.result.value[1].device_id)
			-- If the script doesn't exist, allow the write
			retval.value = retval.value or data
		end
		if connected then databasedisconnect() end
	end)
	if not res and err then
		retval.errtxt = err
	end
	return retval
end

-- The functions must be added after they're declared
functions = {
	getselectresponse=getselectresponse,
	runsqlcommand=runsqlcommand,
	get_device=get_device,
	get_device_params=get_device_params,
	set_device_params=set_device_params,
}

list_requests = function()
	local retval = {}
	local errtxt
	-- Get the templates from the DB
        local res, err = pcall(function()
		local connected = databaseconnect()
		local sql = "SELECT * FROM provisioning_requests ORDER BY date DESC"
		retval = getselectresponse(sql)
		-- Get the corresponding device_id's for each request
		sql = "SELECT * FROM provisioning_values WHERE param_id=(SELECT param_id FROM provisioning_params WHERE name='mac')"
		local ids = getselectresponse(sql)
		local reverseids = {}
		for i,v in ipairs(ids) do
			reverseids[v.value] = v.device_id
		end
		for i,v in ipairs(retval) do
			v.device_id = reverseids[v.mac]
		end
		if connected then databasedisconnect() end
	end)
	if not res and err then
		errtxt = err
	end

	return cfe({ type="structure", value=retval, label="List of Requests", errtxt=errtxt })
end

delete_request = function(mac)
	local result = ""
	local errtxt
       	local res, err = pcall(function()
		local connected = databaseconnect()
		local sql = "SELECT * FROM provisioning_requests WHERE mac='"..escape(string.upper(mac)).."'"
		local tmp = getselectresponse(sql)
		if #tmp == 0 then
			errtxt = "Request does not exist"
		else
			-- Remove the request
			sql = "DELETE FROM provisioning_requests WHERE mac='"..escape(string.upper(mac)).."'"
			runsqlcommand(sql)
			result = "Request Deleted"
		end
		if connected then databasedisconnect() end
	end)
	if not res and err then
		errtxt = err
	end

	return cfe({ value=result, errtxt=errtxt, label="Delete Request Result" })
end

get_request = function(mac)
	local retval = {}
	retval.mac = cfe({ value=mac or "", label="MAC Address" })
	return cfe({ type="group", value=retval, label="Create Device from Request" })
end

create_from_request = function(request)
	success = false
       	local res, err = pcall(function()
		local connected = databaseconnect()
		local sql = "SELECT * FROM provisioning_requests WHERE mac='"..escape(string.upper(request.value.mac.value)).."'"
		local tmp = getselectresponse(sql)
		if #tmp == 0 then
			request.value.mac.errtxt = "Request does not exist"
		else
			-- Determine which class to use (need a class that specifies a template)
			local c = list_classes()
			local class, group = callscript(determineclassscriptfile, tmp[1].agent, c)

			-- Create the device
			local device = get_device()
			if class and group and device.value.classes.value[group] then
				device.value.classes.value[group].value = class
			end
			device = create_device(device)
			if device.errtxt then
				request.errtxt = device.errtxt
			else
				local params = get_device_params(device.value.device_id.value)
				-- Set the MAC Address
				if params.value.device and params.value.device.value.mac then
					params.value.device.value.mac.value = string.upper(request.value.mac.value)
					params = set_device_params(params)
				end
				if params.errtxt then
					request.errtxt = params.errtxt
					delete_device(device.value.device_id.value)
				else
					success = true
					request.value.device_id = device.value.device_id
				end
			end
		end
		if connected then databasedisconnect() end
	end)
	if not res and err then
		request.errtxt = err
	end
	
	if not success and not request.errtxt then
		request.errtxt = "Failed to create device"
	end
	return request
end