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module(..., package.seeall)

-- Load libraries
require("modelfunctions")
require("posix")
require("fs")
require("format")
require("validator")

-- Set variables
local processname = "postfix"
local packagename = "postfix"
local baseurl = "/etc/postfix/"
local aliasesfile = "/etc/mail/aliases"

local path = "PATH=/usr/local/bin:/usr/bin:/bin:/usr/local/sbin:/usr/sbin:/sbin "

-- ################################################################################
-- LOCAL FUNCTIONS

local getconfig = function()
	-- the postfix config is like an ini file, but it allows multi-line entries
	-- so, we convert and then parse like ini file
	local content = fs.read_file(baseurl.."main.cf") or ""
	-- lines that begin with whitespace and first non-whitespace character is not '#'
	-- are continuations, so delete the carriage return
	-- have to delete blank and comment lines first, because could be before continuation line
	-- I've seen no documentation on inline comments, so user beware
	content = string.gsub(content, "\n+", "\n")
	content = string.gsub(content, "\n%s*#[^\n]*", "")
	content = string.gsub(content, "\n[^%S\n]+([^#])", " %1")

	return format.parse_ini_file(content, "") or {}, content
end

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

function startstop_service(action)
	return modelfunctions.startstop_service(processname, action, {"start", "stop", "restart", "reload"})
end

function getstatus()
	local status = modelfunctions.getstatus(processname, packagename, "Postfix Status")

	-- Enabled status is unique for postfix
	-- Look for pid file stored in queue_directory .. /pid/
	local config = getconfig()
	if config.queue_directory then
		local pidfiles = fs.find_files_as_array(".*\.pid", config.queue_directory.."/pid/")
		if pidfiles and pidfiles[1] then
			local file = pidfiles[1]
			-- check to see if there's a matching proc directory and that it was created slightly after the pid file
			-- this allows us to avoid the problem with proc numbers wrapping
			local tmp = string.match(fs.read_file(file) or "", "%d+")
			if tmp then
				local dir = "/proc/" .. tmp
				-- postfix seems to have a problem with changing times?
			--[[	filetime = posix.stat(file, "ctime")
				dirtime = posix.stat(dir, "ctime")
				if dirtime and (tonumber(dirtime) - tonumber(filetime) < 100) then
			--]]
				if posix.stat(dir.."/cmdline") and string.find(fs.read_file(dir.."/cmdline"), processname) then
					status.value.status.value = "Running"
				end
			end
		end
	end

	return status
end

function getstatusdetails()
	return cfe({ type="longtext", value="", label="Postfix Status Details" })
end

local function geteditablefilelist()
	local listed_files = fs.find_files_as_array("[^%.].*", baseurl)
	table.insert(listed_files, aliasesfile)
	return listed_files
end

function getfilelist()
	local listed_files = {}

	for i,name in ipairs(geteditablefilelist()) do
		local filedetails = fs.stat(name) or {}
		table.insert ( listed_files , {filename=name, mtime=filedetails.mtime or "---", filesize=filedetails.size or "0"} )
	end

	table.sort(listed_files, function (a,b) return (a.filename < b.filename) end )

	return cfe({ type="list", value=listed_files, label="Postfix File List" })
end

function getfiledetails(filename)
	return modelfunctions.getfiledetails(filename, geteditablefilelist())
end

function updatefiledetails(filedetails)
	return modelfunctions.setfiledetails(filedetails, geteditablefilelist())
end

function getnewfile()
	local options = {}
	options.filename = cfe({ label="File Name" })
	return cfe({ type="group", value=options, label="New File" })
end

function createfile(newfile)
	newfile.errtxt = "Failed to create file"
	local path = newfile.value.filename.value
	if not string.find(path, "/") then
		path = baseurl..path
	end
	if validator.is_valid_filename(path, baseurl) then
		if posix.stat(path) then
			newfile.value.filename.errtxt = "File already exists"
		else
			fs.create_file(path)
			newfile.errtxt = nil
		end
	else
		newfile.value.filename.errtxt = "Invalid filename"
	end

	return newfile
end

function deletefile(filename)
	local result = cfe({ value="Failed to delete file", label="Delete file result" })
	if not validator.is_valid_filename(filename, baseurl) then
		result.errtxt = "Not a valid filename!"
	elseif not fs.is_file(filename) then
		result.errtxt = "File doesn't exist!"
	else
		os.remove(filename)
		result.value = "File Deleted"
	end
	return result
end

function rebuild_databases()
	local result = cfe({ value={"Rebuilding databases"}, label="Rebuild Databases result" })
	table.insert(result.value, " See logfile for possible errors")
	local cmd,f,cmdresult
	-- parse main.cf looking for hash files
	local config, content = getconfig()
	for i,db in ipairs({"btree", "cdb", "dbm", "hash", "sdbm"}) do
		for filename in string.gmatch(content, "[%s=]("..db..":%S+)") do
			filename = string.gsub(filename, ",$", "")
			-- run postmap on file
			if filename and not string.find(filename, aliasesfile) then
				cmd = "postmap "..filename
				table.insert(result.value, "Running: "..cmd)
				f = io.popen(format.escapespecialcharacters(path..cmd))
				table.insert(result.value, f:read("*a"))
				f:close()
			end
		end
	end
	-- finally, run newaliases
	cmd = "newaliases"
	table.insert(result.value, "Running: "..cmd)
	f = io.popen(format.escapespecialcharacters(path..cmd))
	table.insert(result.value, f:read("*a"))
	f:close()

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