local captcha_options = module:get_option("captcha_options", {});

local nodeprep = require "util.encodings".stringprep.nodeprep;

local usermanager = require "core.usermanager";

local http = require "util.http";

function generate_captcha(display_options)

  		recaptcha_display_error = display_options and display_options.recaptcha_error

  			and ("&error="..display_options.recaptcha_error) or "";

  	}, {

  		__index = function (t, k)

  			if captcha_options[k] then return captcha_options[k]; end

  			module:log("error", "Missing parameter from captcha_options: %s", k);

end

function verify_captcha(form, callback)

	http.request("https://www.google.com/recaptcha/api/verify", {

		body = http.formencode {

			privatekey = captcha_options.recaptcha_private_key;

			remoteip = request.conn:ip();

			challenge = form.recaptcha_challenge_field;

			response = form.recaptcha_response_field;

		};

	}, function (verify_result, code)

		local verify_ok, verify_err = verify_result:match("^([^\n]+)\n([^\n]+)");

		if verify_ok == "true" then

			callback(true);

		else

			callback(false, verify_err)

		end

	end);

end

function generate_page(event, display_options)

	local request = event.request;

end

function register_user(form)

        local prepped_username = nodeprep(form.username);

        if usermanager.user_exists(prepped_username, module.host) then

                return nil, "user-exists";

        end

        return usermanager.create_user(prepped_username, form.password, module.host);

end

function generate_success(event, form)

end

function generate_register_response(event, form, ok, err)

	local message;

	if ok then

		return generate_success(event, form);

	else

		return generate_page(event, { register_error = err });

	end

end

function handle_form(event)

	local request, response = event.request, event.response;

	local form = http.formdecode(request.body);

	verify_captcha(form, function (ok, err)

		if ok then

			local register_ok, register_err = register_user(form);

			response:send(generate_register_response(event, form, register_ok, register_err));

		else

			response:send(generate_page(event, { register_error = err }));

		end

	end);

	return true; -- Leave connection open until we respond above

end

module:provides("http", {

	route = {

		GET = generate_page;

		POST = handle_form;

	};

});