// Matrix Construct
//
// Copyright (C) Matrix Construct Developers, Authors & Contributors
// Copyright (C) 2016-2018 Jason Volk <jason@zemos.net>
//
// Permission to use, copy, modify, and/or distribute this software for any
// purpose with or without fee is hereby granted, provided that the above
// copyright notice and this permission notice is present in all copies. The
// full license for this software is available in the LICENSE file.

using namespace ircd;

mapi::header
IRCD_MODULE
{
	"Server Control"
};

const ircd::m::room::id::buf
control_room_id
{
	"!control", ircd::my_host()
};

const m::room
control_room
{
	control_room_id
};

const ircd::m::room::id::buf
conf_room_id
{
	"!conf", ircd::my_host()
};

static void
_conf_set(const m::event &event,
          const string_view &key,
          const string_view &val)
{
	const auto &sender
	{
		at<"sender"_>(event)
	};

	using prototype = m::event::id::buf (const m::user::id &,
	                                     const string_view &key,
	                                     const string_view &val);

	static import<prototype> set_conf_item
	{
		"s_conf", "set_conf_item"
	};

	const auto event_id
	{
		set_conf_item(sender, key, val)
	};

	char kvbuf[768];
	notice(control_room, fmt::sprintf
	{
		kvbuf, "[%s] %s = %s", string_view{event_id}, key, val
	});
}

static void
_conf_get(const m::event &event,
          const string_view &key)
{
	using closure = std::function<void (const string_view &val)>;
	using prototype = void (const string_view &key,
	                        const closure &);

	static import<prototype> get_conf_item
	{
		"s_conf", "get_conf_item"
	};

	get_conf_item(key, [&key]
	(const string_view &value)
	{
		char kvbuf[256];
		notice(control_room, fmt::sprintf
		{
			kvbuf, "%s = %s", key, value
		});
	});
}

static void
_conf_list(const m::event &event)
{
	char val[512];
	std::stringstream ss;
	ss << "<table>";
	for(const auto &p : conf::items)
		ss << "<tr><td>" << std::setw(32) << std::right << p.first
		   << "</td><td>" << p.second->get(val)
		   << "</td></tr>";
	ss << "</table>";

	msghtml(control_room, m::me.user_id, ss.str());
}

static void
_cmd__conf(const m::event &event,
           const string_view &line)
{
	string_view tokens[4];
	const size_t count
	{
		ircd::tokens(line, ' ', tokens)
	};

	const auto &cmd{tokens[0]};
	const auto &key{tokens[1]};
	const auto &val{tokens[3]};

	if(cmd == "set" && count >= 4)
		return _conf_set(event, key, val);

	if(cmd == "get" && count >= 2)
		return _conf_get(event, key);

	if(cmd == "list")
		return _conf_list(event);
}

static void
_cmd__die(const m::event &event,
          const string_view &line)
{
	ircd::post([]
	{
		ircd::quit();
	});

	ctx::yield();
}

static void
command_control(const m::event &event)
noexcept try
{
	const auto &content
	{
		at<"content"_>(event)
	};

	const string_view &body
	{
		unquote(content.at("body"))
	};

	const string_view &cmd
	{
		token(body, ' ', 0, {})
	};

	switch(hash(cmd))
	{
		case hash("conf"):
			return _cmd__conf(event, tokens_after(body, ' ', 0));

		case hash("die"):
			return _cmd__die(event, tokens_after(body, ' ', 0));
	}

	const ircd::module console_module
	{
		"console"
	};

	using prototype = int (std::ostream &, const string_view &, const string_view &);
	const mods::import<prototype> command
	{
		*console_module, "console_command"
	};

	std::ostringstream out;
	out.exceptions(out.badbit | out.failbit | out.eofbit);

	out << "<pre>";
	static const string_view opts{"html"};
	command(out, body, opts);
	out << "</pre>";

	const auto str
	{
		replace(out.str().substr(0, 48_KiB), '\n', "<br />")
	};

	const string_view alt //TODO: X
	{
		"no alt text"
	};

	msghtml(control_room, m::me.user_id, str, alt);
}
catch(const std::exception &e)
{
	notice(control_room, e.what());
}

const m::hook
command_control_hook
{
	command_control,
	{
		{ "_site",       "vm.notify"       },
		{ "room_id",     "!control"        },
		{ "type",        "m.room.message"  },
		{ "content",
		{
			{ "msgtype", "m.text" }
		}}
	}
};

static void
create_control_room(const m::event &)
{
	create(control_room_id, m::me.user_id);
	join(control_room, m::me.user_id);
	send(control_room, m::me.user_id, "m.room.name", "",
	{
		{ "name", "Control Room" }
	});

	notice(control_room, m::me.user_id, "Welcome to the control room.");
	notice(control_room, m::me.user_id, "I am the daemon. You can talk to me in this room by highlighting me.");
}

const m::hook
create_control_hook
{
	create_control_room,
	{
		{ "_site",       "vm.notify"      },
		{ "room_id",     "!ircd"          },
		{ "type",        "m.room.create"  },
	}
};