local socket = require "socket"

local mime = require "mime"

local url = require "socket.url"

local server = require "net.server"

local connlisteners_get = require "net.connlisteners".get;

local listener = connlisteners_get("httpclient") or error("No httpclient listener!");

local t_insert, t_concat = table.insert, table.concat;

local tonumber, tostring, pairs = tonumber, tostring, pairs;

local print = function () end

local urlcodes = setmetatable({}, { __index = function (t, k) t[k] = char(tonumber("0x"..k)); return t[k]; end });

local urlencode = function (s) return s and (s:gsub("%W", function (c) return string.format("%%%02x", c:byte()); end)); end

module "http"

local function expectbody(reqt, code)

    if reqt.method == "HEAD" then return nil end

    if code == 204 or code == 304 then return nil end

    if code >= 100 and code < 200 then return nil end

    return 1

end

local function request_reader(request, data, startpos)

	if not data then

		if request.body then

			request.callback(t_concat(request.body), request.code, request);

			-- Error.. connection was closed prematurely

			request.callback("connection-closed", 0, request);

		end

		destroy_request(request);

		return;

	end

	if request.state == "body" then

		print("Reading body...")

		if not request.body then request.body = {}; request.havebodylength, request.bodylength = 0, tonumber(request.responseheaders["content-length"]); end

		if startpos then

			data = data:sub(startpos, -1)

		end

		t_insert(request.body, data);

		if request.bodylength then

			request.havebodylength = request.havebodylength + #data;

			if request.havebodylength >= request.bodylength then

				-- We have the body

				if request.callback then

					request.callback(t_concat(request.body), request.code, request);

				end

			end

		end

	elseif request.state == "headers" then

		print("Reading headers...")

		local pos = startpos;

		local headers = request.responseheaders or {};

		for line in data:sub(startpos, -1):gmatch("(.-)\r\n") do

			startpos = startpos + #line + 2;

			local k, v = line:match("(%S+): (.+)");

			if k and v then

				headers[k:lower()] = v;

				print("Header: "..k:lower().." = "..v);

			elseif #line == 0 then

				request.responseheaders = headers;

				break;

			else

				print("Unhandled header line: "..line);

			end

		end

		-- Reached the end of the headers

		request.state = "body";

		if #data > startpos then

			return request_reader(request, data, startpos);

		end

	elseif request.state == "status" then

		print("Reading status...")

		local http, code, text, linelen = data:match("^HTTP/(%S+) (%d+) (.-)\r\n()", startpos);

		code = tonumber(code);

		if not code then

			return request.callback("invalid-status-line", 0, request);

		end

		request.code, request.responseversion = code, http;

		if request.onlystatus or not expectbody(request, code) then

			if request.callback then

				request.callback(nil, code, request);

			end

			destroy_request(request);

			return;

		end

		request.state = "headers";

		if #data > linelen then

			return request_reader(request, data, linelen);

		end

	end

end

function request(u, ex, callback)

	local req = url.parse(u);

	local custom_headers, body;

	local default_headers = { ["Host"] = req.host, ["User-Agent"] = "Prosody XMPP Server" }

	if req.userinfo then

		default_headers["Authorization"] = "Basic "..mime.b64(req.userinfo);

	end

	if ex then

		custom_headers = ex.custom_headers;

		req.onlystatus = ex.onlystatus;

		body = ex.body;

		if body then

			req.method = "POST ";

			default_headers["Content-Length"] = tostring(#body);

			default_headers["Content-Type"] = "application/x-www-form-urlencoded";

		end

		if ex.method then req.method = ex.method; end

	end

	req.handler, req.conn = server.wraptcpclient(listener, socket.tcp(), req.host, req.port or 80, 0, "*a");

	req.write = req.handler.write;

	req.conn:settimeout(0);

	local ok, err = req.conn:connect(req.host, req.port or 80);

	if not ok and err ~= "timeout" then

		return nil, err;

	end

	req.write((req.method or "GET ")..req.path.." HTTP/1.0\r\n");

	local t = { [2] = ": ", [4] = "\r\n" };

	if custom_headers then

		for k, v in pairs(custom_headers) do

			t[1], t[3] = k, v;

			req.write(t_concat(t));

			default_headers[k] = nil;

		end

	end

	for k, v in pairs(default_headers) do

		t[1], t[3] = k, v;

		req.write(t_concat(t));

		default_headers[k] = nil;

	end

	req.write("\r\n");

	if body then

		req.write(body);

	end

	req.callback = callback;

	req.reader = request_reader;

	req.state = "status"

	listener.register_request(req.handler, req);

	return req;

end

function destroy_request(request)

	if request.conn then

		request.handler.close()

		listener.disconnect(request.conn, "closed");

	end

end

_M.urlencode = urlencode;

return _M;