local array = require "util.array";

local jid = require "util.jid";

local json = require "util.json";

local st = require "util.stanza";

local xml = require "util.xml";

-- Reused in many XEPs so declared up here

local dataform = {

	"func", "jabber:x:data", "x",

	function (s)

		local fields = array();

		local form = {

			type = s.attr.type;

			title = s:get_child_text("title");

			instructions = s:get_child_text("instructions");

			fields = fields;

		};

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

			local i = {

				var = field.attr.var;

				type = field.attr.type;

				label = field.attr.label;

				desc = field:get_child_text("desc");

				required = field:get_child("required") and true or nil;

				value = field:get_child_text("value");

			};

			if field.attr.type == "jid-multi" or field.attr.type == "list-multi" or field.attr.type == "text-multi" then

				local value = array();

				for v in field:childtags("value") do

					value:push(v:get_text());

				end

				if field.attr.type == "text-multi" then

					i.value = value:concat("\n");

				else

					i.value = value;

				end

			end

			if field.attr.type == "list-single" or field.attr.type == "list-multi" then

				local options = array();

				for o in field:childtags("option") do

					options:push({ label = o.attr.label, value = o:get_child_text("value") });

				end

				i.options = options;

			end

			fields:push(i);

		end

		return form;

	end;

	function (x)

		if type(x) == "table" and x ~= json.null then

			local form = st.stanza("x", { xmlns = "jabber:x:data", type = x.type });

			if x.title then

				form:text_tag("title", x.title);

			end

			if x.instructions then

				form:text_tag("instructions", x.instructions);

			end

			if type(x.fields) == "table" then

				for _, f in ipairs(x.fields) do

					if type(f) == "table" then

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

						if f.desc then

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

						end

						if f.required == true then

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

						end

						if type(f.value) == "string" then

							form:text_tag("value", f.value);

						elseif type(f.value) == "table" then

							for _, v in ipairs(f.value) do

								form:text_tag("value", v);

							end

						end

						if type(f.options) == "table" then

							for _, o in ipairs(f.value) do

								if type(o) == "table" then

									form:tag("option", { label = o.label });

									form:text_tag("value", o.value);

									form:up();

								end

							end

						end

					end

				end

			end

			return form;

		end

	end;

};

local simple_types = {

	-- basic message

	body = "text_tag",

	subject = "text_tag",

	thread = "text_tag",

	-- basic presence

	show = "text_tag",

	status = "text_tag",

	priority = "text_tag",

	state = {"name", "http://jabber.org/protocol/chatstates"},

	nick = {"text_tag", "http://jabber.org/protocol/nick", "nick"},

	delay = {"attr", "urn:xmpp:delay", "delay", "stamp"},

	replace = {"attr", "urn:xmpp:message-correct:0", "replace", "id"},

	-- XEP-0045 MUC

	-- TODO history, password, ???

	join = {"bool_tag", "http://jabber.org/protocol/muc", "x"},

	-- XEP-0071

	html = {

		"func", "http://jabber.org/protocol/xhtml-im", "html",

		function (s) --> json string

			return (tostring(s:get_child("body", "http://www.w3.org/1999/xhtml")):gsub(" xmlns='[^']*'","", 1));

		end;

		function (s) --> xml

			if type(s) == "string" then

				return assert(xml.parse([[<x:html xmlns:x='http://jabber.org/protocol/xhtml-im' xmlns='http://www.w3.org/1999/xhtml'>]]..s..[[</x:html>]]));

			end

		end;

	};

	-- XEP-0199: XMPP Ping

	ping = {"bool_tag", "urn:xmpp:ping", "ping"},

	-- XEP-0092: Software Version

	version = {"func", "jabber:iq:version", "query",

		function (s)

			return {

				name = s:get_child_text("name");

				version = s:get_child_text("version");

				os = s:get_child_text("os");

			}

		end,

		function (s)

			local v = st.stanza("query", { xmlns = "jabber:iq:version" });

			if type(s) == "table" then

				v:text_tag("name", s.name);

				v:text_tag("version", s.version);

				if s.os then

					v:text_tag("os", s.os);

				end

			end

			return v;

		end

	};

	-- XEP-0030

	disco = {

		"func", "http://jabber.org/protocol/disco#info", "query",

		function (s) --> array of features

			local identities, features = array(), array();

			for tag in s:childtags() do

				if tag.name == "identity" and tag.attr.category and tag.attr.type then

					identities:push({ category = tag.attr.category, type = tag.attr.type, name = tag.attr.name });

				elseif tag.name == "feature" and tag.attr.var then

					features:push(tag.attr.var);

				end

			end

			return { node = s.attr.node, identities = identities, features = features, };

		end;

		function  (s)

			if type(s) == "table" and s ~= json.null then

				local disco = st.stanza("query", { xmlns = "http://jabber.org/protocol/disco#info", node = s.node });

				if s.identities then

					for _, identity in ipairs(s.identities) do

						disco:tag("identity", { category = identity.category, type = identity.type, name = identity.name }):up();

					end

				end

				if s.features then

					for _, feature in ipairs(s.features) do

						disco:tag("feature", { var = feature }):up();

					end

				end

				return disco;

			else

				return st.stanza("query", { xmlns = "http://jabber.org/protocol/disco#info", });

			end

		end;

	};

	items = {

		"func", "http://jabber.org/protocol/disco#items", "query",

		function (s) --> array of features | map with node

			if s.attr.node and s.tags[1] == nil then

				return { node = s.attr. node };

			end

			local items = array();

			for item in s:childtags("item") do

				items:push({ jid = item.attr.jid, node = item.attr.node, name = item.attr.name });

			end

			return items;

		end;

		function  (s)

			if type(s) == "table" and s ~= json.null then

				local disco = st.stanza("query", { xmlns = "http://jabber.org/protocol/disco#items", node = s.node });

				for _, item in ipairs(s) do

					if type(item) == "string" then

						disco:tag("item", { jid = item });

					elseif type(item) == "table" then

						disco:tag("item", { jid = item.jid, node = item.node, name = item.name });

					end

				end

				return disco;

			else

				return st.stanza("query", { xmlns = "http://jabber.org/protocol/disco#items", });

			end

		end;

	};

	-- XEP-0050: Ad-Hoc Commands

	command = {"func", "http://jabber.org/protocol/commands", "command",

		function (s)

			local cmd = {

				action = s.attr.action,

				node = s.attr.node,

				sessionid = s.attr.sessionid,

				status = s.attr.status,

			};

			local actions = s:get_child("actions");

			local note = s:get_child("note");

			local form = s:get_child("x", "jabber:x:data");

			if actions then

				cmd.actions = {

					execute = actions.attr.execute,

				};

				for action in actions:childtags() do

					cmd.actions[action.name] = true

				end

			elseif note then

				cmd.note = {

					type = note.attr.type;

					text = note:get_text();

				};

			end

			if form then

				cmd.form = dataform[4](form);

			end

			return cmd;

		end;

		function (s)

			if type(s) == "table" and s ~= json.null then

				local cmd = st.stanza("command", {

						xmlns  = "http://jabber.org/protocol/commands",

						action = s.action,

						node = s.node,

						sessionid = s.sessionid,

						status = s.status,

					});

				if type(s.actions) == "table" then

					cmd:tag("actions", { execute = s.actions.execute });

					do

						if s.actions.next == true then

							cmd:tag("next"):up();

						end

						if s.actions.prev == true then

							cmd:tag("prev"):up();

						end

						if s.actions.complete == true then

							cmd:tag("complete"):up();

						end

					end

					cmd:up();

				elseif type(s.note) == "table" then

					cmd:text_tag("note", s.note.text, { type = s.note.type });

				end

				if s.form then

					cmd:add_child(dataform[5](s.form));

				end

				return cmd;

			elseif type(s) == "string" then -- assume node

				return st.stanza("command", { xmlns  = "http://jabber.org/protocol/commands", node = s });

			end

			-- else .. missing required attribute

		end;

	};

	-- XEP-0066: Out of Band Data

	oob_url = {"func", "jabber:iq:oob", "query",

		function (s)

			return s:get_child_text("url");

		end;

		function (s)

			if type(s) == "string" then

				return st.stanza("query", { xmlns = "jabber:iq:oob" }):text_tag("url", s);

			end

		end;

	};

	-- XEP-XXXX: User-defined Data Transfer

	payload = {"func", "urn:xmpp:udt:0", "payload",

		function (s)

			local rawjson = s:get_child_text("json", "urn:xmpp:json:0");

			if not rawjson then return nil, "missing-json-payload"; end

			local parsed, err = json.decode(rawjson);

			if not parsed then return nil, err; end

			return {

				datatype = s.attr.datatype;

				data = parsed;

			};

		end;

		function (s)

			if type(s) == "table" then

				return st.stanza("payload", { xmlns = "urn:xmpp:udt:0", datatype = s.datatype })

					:tag("json", { xmlns = "urn:xmpp:json:0" }):text(json.encode(s.data));

			end;

		end

	};

};

local implied_kinds = {

	disco = "iq",

	items = "iq",

	ping = "iq",

	version = "iq",

	command = "iq",

	body = "message",

	html = "message",

	replace = "message",

	state = "message",

	subject = "message",

	thread = "message",

	join = "presence",

	priority = "presence",

	show = "presence",

	status = "presence",

}

local kind_by_type = {

	get = "iq", set = "iq", result = "iq",

	normal = "message", chat = "message", headline = "message", groupchat = "message",

	available = "presence", unavailable = "presence",

	subscribe = "presence", unsubscribe = "presence",

	subscribed = "presence", unsubscribed = "presence",

}

local function st2json(s)

	local t = {

		kind = s.name,

		type = s.attr.type,

		to = s.attr.to,

		from = s.attr.from,

		id = s.attr.id,

	};

	if s.name == "presence" and not s.attr.type then

		t.type = "available";

	end

	if t.to then

		t.to = jid.prep(t.to);

		if not t.to then return nil, "invalid-jid-to"; end

	end

	if t.from then

		t.from = jid.prep(t.from);

		if not t.from then return nil, "invalid-jid-from"; end

	end

	if t.type == "error" then

		local error = s:get_child("error");