http = require("socket.http")
apk = require("apk")

local M = {}

local cache = {}

local function read_mate_packages(mate_ver)
	local t = {}
	local shaurl = "http://pub.mate-desktop.org/releases/"..mate_ver.."/SHA1SUMS"
	local shadata = assert(http.request(shaurl))

	for hex,name,ver in string.gmatch(shadata,
		"([0-9a-fA-F]+)%s+([^\n]+)-([0-9.]+)%.tar%.xz\n") do

		print(name, ver)
		local v = t[name] or "0"
		if apk.version_compare(v, ver) == "<" then
			t[name] = ver
		end
	end
	return t
end

local function find_newer(self)
	local oldver = self.pkg.pkgver
	if cache[self.mate_ver] == nil then
		cache[self.mate_ver] = read_mate_packages(self.mate_ver)
	end
	local v = cache[self.mate_ver][self.pkg.pkgname]
	if v == nil then
		print(("DEBUG: %s: not in mate list"):format(self.pkg.pkgname))
	end
	if v and apk.version_compare(self.pkg.pkgver, v) == "<" then
		return v
	end
	return nil
end

function M.init(pkg)
	for source in pkg:remote_sources() do
		local mate_ver = source:match("mate%-desktop%.org/releases/([^/]+)/")

		if mate_ver then
			return {
				provider_name = "mate",
				mate_ver = mate_ver,
				find_newer = find_newer,
				pkg = pkg
			}
		end
	end
	return nil
end

return M