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";

local field_mappings; -- in scope for "func" mappings

field_mappings = {

	-- top level stanza attributes

	-- needed here to mark them as known fields

	kind = "attr",

	type = "attr",

	to = "attr",

	from = "attr",

	id = "attr",

	-- basic message

	body = "text_tag",

	subject = "text_tag",

	thread = "text_tag",

	-- basic presence

	show = "text_tag",

	status = "text_tag",

	priority = "text_tag",

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

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

	delay = { type = "attr", xmlns = "urn:xmpp:delay", tagname = "delay", attr = "stamp" },

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

	-- XEP-0045 MUC

	-- TODO history, password, ???

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

	-- XEP-0071

	html = {

		type = "func", xmlns = "http://jabber.org/protocol/xhtml-im", tagname = "html",

		st2json = function (s) --> json string

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

		end;

		json2st = 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 = { type = "bool_tag", xmlns = "urn:xmpp:ping", tagname = "ping" },

	-- XEP-0092: Software Version

	version = { type = "func", xmlns = "jabber:iq:version", tagname = "query",

		st2json = function (s)

			return {

				name = s:get_child_text("name");

				version = s:get_child_text("version");

				os = s:get_child_text("os");

			}

		end,

		json2st = 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 = {

		type = "func", xmlns = "http://jabber.org/protocol/disco#info", tagname = "query",

		st2json = 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;

		json2st = 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 = {

		type = "func", xmlns = "http://jabber.org/protocol/disco#items", tagname = "query",

		st2json = 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;

		json2st = 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 = { type = "func", xmlns = "http://jabber.org/protocol/commands", tagname = "command",

		st2json = 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 = field_mappings.dataform.st2json(form);

			end

			return cmd;

		end;

		json2st = 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(field_mappings.dataform.json2st(s.form));

				elseif s.data then

					cmd:add_child(field_mappings.formdata.json2st(s.data));

				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 = { type = "func", xmlns = "jabber:iq:oob", tagname = "query",

		st2json = function (s)

			return s:get_child_text("url");

		end;

		json2st = function (s)

			if type(s) == "string" then

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

			end

		end;

	};

	-- XEP-0432: Simple JSON Messaging

	payload = { type = "func", xmlns = "urn:xmpp:json-msg:0", tagname = "payload",

		st2json = 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;

		json2st = function (s)

			if type(s) == "table" then

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

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

			end;

		end

	};

	-- XEP-0004: Data Forms

	dataform = {

		-- Generic and complete dataforms mapping

		type = "func", xmlns = "jabber:x:data", tagname = "x",

		st2json = 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;

		json2st = 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;

	};

	-- Simpler mapping of dataform from JSON map

	formdata = { type = "func", xmlns = "jabber:x:data", tagname = "",

		st2json = function ()

			-- Tricky to do in a generic way without each form layout

			-- In the future, some well-known layouts might be understood

			return nil, "not-implemented";

		end,

		json2st = function (s, t)

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

			for k, v in pairs(s) do

				form:tag("field", { var = k });

				if type(v) == "string" then

					form:text_tag("value", v);

				elseif type(v) == "table" then

					for _, v_ in ipairs(v) do

						form:text_tag("value", v_);

					end

				end

			end

			return form;

		end

	};