-- Prosody IM

-- Copyright (C) 2008-2010 Matthew Wild

-- Copyright (C) 2008-2010 Waqas Hussain

--

-- This project is MIT/X11 licensed. Please see the

-- COPYING file in the source package for more information.

--

local setmetatable = setmetatable;

local ipairs = ipairs;

local type, next = type, next;

local t_concat = table.concat;

local st = require "util.stanza";

local jid_prep = require "util.jid".prep;

local _ENV = nil;

-- luacheck: std none

local xmlns_forms = 'jabber:x:data';

local form_t = {};

local form_mt = { __index = form_t };

local function new(layout)

	return setmetatable(layout, form_mt);

end

function form_t.form(layout, data, formtype)

	local form = st.stanza("x", { xmlns = xmlns_forms, type = formtype or "form" });

	if layout.title then

		form:tag("title"):text(layout.title):up();

	end

	if layout.instructions then

		form:tag("instructions"):text(layout.instructions):up();

	end

	for _, field in ipairs(layout) do

		local field_type = field.type or "text-single";

		-- Add field tag

		form:tag("field", { type = field_type, var = field.name, label = field.label });

		if field.desc then

			form:text_tag("desc", field.desc);

		end

		local value;

		if data and data[field.name] ~= nil then

			value = data[field.name];

		else

			value = field.value;

		end

		if value ~= nil then

			-- Add value, depending on type

			if field_type == "hidden" then

				if type(value) == "table" then

					-- Assume an XML snippet

					form:tag("value")

						:add_child(value)

						:up();

				else

					form:tag("value"):text(value):up();

				end

			elseif field_type == "boolean" then

				form:tag("value"):text((value and "1") or "0"):up();

			elseif field_type == "fixed" then

				form:tag("value"):text(value):up();

			elseif field_type == "jid-multi" then

				for _, jid in ipairs(value) do

					form:tag("value"):text(jid):up();

				end

			elseif field_type == "jid-single" then

				form:tag("value"):text(value):up();

			elseif field_type == "text-single" or field_type == "text-private" then

				form:tag("value"):text(value):up();

			elseif field_type == "text-multi" then

				-- Split into multiple <value> tags, one for each line

				for line in value:gmatch("([^\r\n]+)\r?\n*") do

					form:tag("value"):text(line):up();

				end

			elseif field_type == "list-single" then

				if formtype ~= "result" then

					local has_default = false;

					for _, val in ipairs(field.options or value) do

						if type(val) == "table" then

							form:tag("option", { label = val.label }):tag("value"):text(val.value):up():up();

							if value == val.value or val.default and (not has_default) then

								form:tag("value"):text(val.value):up();

								has_default = true;

							end

						else

							form:tag("option", { label= val }):tag("value"):text(val):up():up();

						end

					end

				end

				if (field.options or formtype == "result") and value then

					form:tag("value"):text(value):up();

				end

			elseif field_type == "list-multi" then

				if formtype ~= "result" then

					for _, val in ipairs(field.options or value) do

						if type(val) == "table" then

							form:tag("option", { label = val.label }):tag("value"):text(val.value):up():up();

							if not field.options and val.default then

								form:tag("value"):text(val.value):up();

							end

						else

							form:tag("option", { label= val }):tag("value"):text(val):up():up();

						end

					end

				end

				if (field.options or formtype == "result") and value then

					for _, val in ipairs(value) do

						form:tag("value"):text(val):up();

					end

				end

			end

		end

		local media = field.media;

		if media then

			form:tag("media", { xmlns = "urn:xmpp:media-element", height = media.height, width = media.width });

			for _, val in ipairs(media) do

				form:tag("uri", { type = val.type }):text(val.uri):up()

			end

			form:up();

		end

		if field.required then

			form:tag("required"):up();

		end

		-- Jump back up to list of fields

		form:up();

	end

	return form;

end

local field_readers = {};

function form_t.data(layout, stanza)

	local data = {};

	local errors = {};

	local present = {};

	for _, field in ipairs(layout) do

		local tag;

		for field_tag in stanza:childtags("field") do

			if field.name == field_tag.attr.var then

				tag = field_tag;

				break;

			end

		end

		if not tag then

			if field.required then

				errors[field.name] = "Required value missing";

			end

			present[field.name] = true;

			local reader = field_readers[field.type];

			if reader then

				data[field.name], errors[field.name] = reader(tag, field.required);

			end

		end

	end

	if next(errors) then

		return data, errors, present;

	end

	return data, nil, present;

end

local function simple_text(field_tag, required)

	local data = field_tag:get_child_text("value");

	-- XEP-0004 does not say if an empty string is acceptable for a required value

	-- so we will follow HTML5 which says that empty string means missing

	if required and (data == nil or data == "") then

		return nil, "Required value missing";

	end

	return data; -- Return whatever get_child_text returned, even if empty string

end

field_readers["text-single"] = simple_text;

field_readers["text-private"] = simple_text;

field_readers["jid-single"] =

	function (field_tag, required)

		local raw_data, err = simple_text(field_tag, required);

		if not raw_data then return raw_data, err; end

		local data = jid_prep(raw_data);

		if not data then

			return nil, "Invalid JID: " .. raw_data;

		end

		return data;

	end

field_readers["jid-multi"] =

	function (field_tag, required)

		local result = {};

		local err = {};

		for value_tag in field_tag:childtags("value") do

			local raw_value = value_tag:get_text();

			local value = jid_prep(raw_value);

			result[#result+1] = value;

			if raw_value and not value then

				err[#err+1] = ("Invalid JID: " .. raw_value);

			end

		end

		if #result > 0 then

			return result, (#err > 0 and t_concat(err, "\n") or nil);

		elseif required then

			return nil, "Required value missing";

		end

	end

field_readers["list-multi"] =

	function (field_tag, required)

		local result = {};

		for value in field_tag:childtags("value") do

			result[#result+1] = value:get_text();

		end

		if #result > 0 then

			return result;

		elseif required then

			return nil, "Required value missing";

		end

	end

field_readers["text-multi"] =

	function (field_tag, required)

		local data, err = field_readers["list-multi"](field_tag, required);

		if data then

			data = t_concat(data, "\n");

		end

		return data, err;

	end

field_readers["list-single"] = simple_text;

local boolean_values = {

	["1"] = true, ["true"] = true,

	["0"] = false, ["false"] = false,

};

field_readers["boolean"] =

	function (field_tag, required)

		local raw_value, err = simple_text(field_tag, required);

		if not raw_value then return raw_value, err; end

		local value = boolean_values[raw_value];

		if value == nil then

			return nil, "Invalid boolean representation:" .. raw_value;

		end

		return value;

	end

field_readers["hidden"] =

	function (field_tag)

		return field_tag:get_child_text("value");

	end

local function get_form_type(form)

	if not st.is_stanza(form) then

		return nil, "not a stanza object";

	elseif form.attr.xmlns ~= "jabber:x:data" or form.name ~= "x" then

		return nil, "not a dataform element";

	end

	for field in form:childtags("field") do

		if field.attr.var == "FORM_TYPE" then

			return field:get_child_text("value");

		end

	end

	return "";

end

return {

	new = new;

	get_type = get_form_type;

};

--[=[

Layout:

{

	title = "MUC Configuration",

	instructions = [[Use this form to configure options for this MUC room.]],

	{ name = "FORM_TYPE", type = "hidden", required = true };

	{ name = "field-name", type = "field-type", required = false };

}

--]=]