-- Copyright (C) 2011-2014 Kim Alvefur

--

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

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

--

-- TODO

-- Fix folding.

local st = require "util.stanza";

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

local type = type;

local next, pairs, ipairs = next, pairs, ipairs;

local from_text, to_text, from_xep54, to_xep54;

local line_sep = "\n";

local vCard_dtd; -- See end of file

local function fold_line()

	error "Not implemented" --TODO

end

local function unfold_line()

	error "Not implemented"

	-- gsub("\r?\n[ \t]([^\r\n])", "%1");

end

local function vCard_esc(s)

	return s:gsub("[,:;\\]", "\\%1"):gsub("\n","\\n");

end

local function vCard_unesc(s)

	return s:gsub("\\?[\\nt:;,]", {

		["\\\\"] = "\\",

		["\\n"] = "\n",

		["\\r"] = "\r",

		["\\t"] = "\t",

		["\\:"] = ":", -- FIXME Shouldn't need to espace : in values, just params

		["\\;"] = ";",

		["\\,"] = ",",

		[":"] = "\29",

		[";"] = "\30",

		[","] = "\31",

	});

end

local function item_to_xep54(item)

	local t = st.stanza(item.name, { xmlns = "vcard-temp" });

	local prop_def = vCard_dtd[item.name];

	if prop_def == "text" then

		t:text(item[1]);

	elseif type(prop_def) == "table" then

		if prop_def.types and item.TYPE then

			if type(item.TYPE) == "table" then

				for _,v in pairs(prop_def.types) do

					for _,typ in pairs(item.TYPE) do

						if typ:upper() == v then

							t:tag(v):up();

							break;

						end

					end

				end

			else

				t:tag(item.TYPE:upper()):up();

			end

		end

		if prop_def.props then

			for _,v in pairs(prop_def.props) do

				if item[v] then

					t:tag(v):up();

				end

			end

		end

		if prop_def.value then

			t:tag(prop_def.value):text(item[1]):up();

		elseif prop_def.values then

			local prop_def_values = prop_def.values;

			local repeat_last = prop_def_values.behaviour == "repeat-last" and prop_def_values[#prop_def_values];

			for i=1,#item do

				t:tag(prop_def.values[i] or repeat_last):text(item[i]):up();

			end

		end

	end

	return t;

end

local function vcard_to_xep54(vCard)

	local t = st.stanza("vCard", { xmlns = "vcard-temp" });

	for i=1,#vCard do

		t:add_child(item_to_xep54(vCard[i]));

	end

	return t;

end

function to_xep54(vCards)

	if not vCards[1] or vCards[1].name then

		return vcard_to_xep54(vCards)

	else

		local t = st.stanza("xCard", { xmlns = "vcard-temp" });

		for i=1,#vCards do

			t:add_child(vcard_to_xep54(vCards[i]));

		end

		return t;

	end

end

function from_text(data)

	data = data -- unfold and remove empty lines

		:gsub("\r\n","\n")

		:gsub("\n ", "")

		:gsub("\n\n+","\n");

	local vCards = {};

	local c; -- current item

	for line in data:gmatch("[^\n]+") do

		local line = vCard_unesc(line);

		local name, params, value = line:match("^([-%a]+)(\30?[^\29]*)\29(.*)$");

		value = value:gsub("\29",":");

		if #params > 0 then

			local _params = {};

			for k,isval,v in params:gmatch("\30([^=]+)(=?)([^\30]*)") do

				k = k:upper();

				local _vt = {};

				for _p in v:gmatch("[^\31]+") do

					_vt[#_vt+1]=_p

					_vt[_p]=true;

				end

				if isval == "=" then

					_params[k]=_vt;

				else

					_params[k]=true;

				end

			end

			params = _params;

		end

		if name == "BEGIN" and value == "VCARD" then

			c = {};

			vCards[#vCards+1] = c;

		elseif name == "END" and value == "VCARD" then

			c = nil;

		elseif c and vCard_dtd[name] then

			local dtd = vCard_dtd[name];

			local p = { name = name };

			c[#c+1]=p;

			--c[name]=p;

			local up = c;

			c = p;

			if dtd.types then

				for _, t in ipairs(dtd.types) do

					local t = t:lower();

					if ( params.TYPE and params.TYPE[t] == true)

							or params[t] == true then

						c.TYPE=t;

					end

				end

			end

			if dtd.props then

				for _, p in ipairs(dtd.props) do

					if params[p] then

						if params[p] == true then

							c[p]=true;

						else

							for _, prop in ipairs(params[p]) do

								c[p]=prop;

							end

						end

					end

				end

			end

			if dtd == "text" or dtd.value then

				t_insert(c, value);

			elseif dtd.values then

				local value = "\30"..value;

				for p in value:gmatch("\30([^\30]*)") do

					t_insert(c, p);

				end

			end

			c = up;

		end

	end

	return vCards;

end

local function item_to_text(item)

	local value = {};

	for i=1,#item do

		value[i] = vCard_esc(item[i]);

	end

	value = t_concat(value, ";");

	local params = "";

	for k,v in pairs(item) do

		if type(k) == "string" and k ~= "name" then

			params = params .. (";%s=%s"):format(k, type(v) == "table" and t_concat(v,",") or v);

		end

	end

	return ("%s%s:%s"):format(item.name, params, value)

end

local function vcard_to_text(vcard)

	local t={};

	t_insert(t, "BEGIN:VCARD")

	for i=1,#vcard do

		t_insert(t, item_to_text(vcard[i]));

	end

	t_insert(t, "END:VCARD")

	return t_concat(t, line_sep);

end

function to_text(vCards)

	if vCards[1] and vCards[1].name then

		return vcard_to_text(vCards)

	else

		local t = {};

		for i=1,#vCards do

			t[i]=vcard_to_text(vCards[i]);

		end

		return t_concat(t, line_sep);

	end

end

local function from_xep54_item(item)

	local prop_name = item.name;

	local prop_def = vCard_dtd[prop_name];

	local prop = { name = prop_name };

	if prop_def == "text" then

		prop[1] = item:get_text();

	elseif type(prop_def) == "table" then

		if prop_def.value then --single item

			prop[1] = item:get_child_text(prop_def.value) or "";

		elseif prop_def.values then --array

			local value_names = prop_def.values;

			if value_names.behaviour == "repeat-last" then

				for i=1,#item.tags do

					t_insert(prop, item.tags[i]:get_text() or "");

				end

			else

				for i=1,#value_names do

					t_insert(prop, item:get_child_text(value_names[i]) or "");

				end

			end

		elseif prop_def.names then

			local names = prop_def.names;

			for i=1,#names do

				if item:get_child(names[i]) then

					prop[1] = names[i];

					break;

				end

			end

		end

		if prop_def.props_verbatim then

			for k,v in pairs(prop_def.props_verbatim) do

				prop[k] = v;

			end

		end

		if prop_def.types then

			local types = prop_def.types;

			prop.TYPE = {};

			for i=1,#types do

				if item:get_child(types[i]) then

					t_insert(prop.TYPE, types[i]:lower());

				end

			end

			if #prop.TYPE == 0 then

				prop.TYPE = nil;

			end

		end

		-- A key-value pair, within a key-value pair?

		if prop_def.props then

			local params = prop_def.props;

			for i=1,#params do

				local name = params[i]

				local data = item:get_child_text(name);

				if data then

					prop[name] = prop[name] or {};

					t_insert(prop[name], data);

				end

			end

		end

	else

		return nil

	end

	return prop;

end

local function from_xep54_vCard(vCard)

	local tags = vCard.tags;

	local t = {};

	for i=1,#tags do

		t_insert(t, from_xep54_item(tags[i]));

	end

	return t

end

function from_xep54(vCard)

	if vCard.attr.xmlns ~= "vcard-temp" then

		return nil, "wrong-xmlns";

	end

	if vCard.name == "xCard" then -- A collection of vCards

		local t = {};

		local vCards = vCard.tags;

		for i=1,#vCards do

			t[i] = from_xep54_vCard(vCards[i]);

		end

		return t

	elseif vCard.name == "vCard" then -- A single vCard

		return from_xep54_vCard(vCard)

	end

end

-- This was adapted from http://xmpp.org/extensions/xep-0054.html#dtd

vCard_dtd = {

	VERSION = "text", --MUST be 3.0, so parsing is redundant

	FN = "text",

	N = {