--  SHORTENURL

-- uses:

--  * goo.gl (online service)

--  * curl (program)

--  * lua-json (https://github.com/harningt/luajson/)

--  * shell_escape (mcabberrc.lua)

--  * option lua_shorten_post_url

--  * switches -s or -n

-- TODO:

--  * other backends

--  * detect curl/wget

--  * ensure curl will not mess screen up

local json = require 'json'

local encodeoptions = {

	strings = {

		encodeSet = '\\"%z\1-\031', -- do not escape /, google does not understand that

	}

}

local curlcommand = "curl -s https://www.googleapis.com/urlshortener/v1/url%s -H 'Content-type: application/json' -d %s"

main.command ( 'shorten',

	function ( args )

		local url  = args[1]

		local post = main.yesno ( main.option ( 'lua_shorten_post_url' ) )

		if not url then -- ugly. need to redesign argument parsing

			if args.s then

				url  = args.s

				post = true

			elseif args.n then

				url  = args.n

				post = false

			end

		end

		if ( not url ) or ( not url:match ( '%w' ) ) then

			print ( 'shorten: You must specify url' )

			return

		end

		local jid         = main.current_buddy ()

		local querystring = ''

		local key         = main.option ( 'lua_shorten_googl_key' )

		if key and key:match ( '%w' ) then

			querystring   = '?key=' .. key

		end

		local replystring = ''

		main.bgread ( ( curlcommand ):format ( querystring, shell_escape ( json.encode ( { longUrl = url }, encodeoptions ) ) ),

			function ( data )

				if data then

					replystring = replystring .. data

					return true

				else -- eof

					local reply = json.decode ( replystring )

					if ( type ( reply ) == 'table' ) and reply.id then

						if jid and post then

							main.run ( ('say_to -q %s %s'):format ( jid, reply.id ) )

						else

							print ( ('Full:  %s\n           Short: %s'):format ( url, reply.id ) )

						end

					else

						if type ( reply ) == 'table' and ( type ( reply.error ) == 'table' ) then

							print ( ('Failed to shorten url: %u %s'):format ( reply.error.code, reply.error.message ) )

						else

							print ( ('Failed to shorten url: Unknown response:\n%s'):format ( replystring ) )

						end

					end

					return false

				end

			end )

	end, true )

-- vim: se ts=4 sw=4: --