/*
 * Copyright (C) 2016-2018 Robin Gareus <robin@gareus.org>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#pragma once

#include <bitset>

#include <cairo.h>

#include "pbd/id.h"
#include "pbd/signals.h"
#include "pbd/xml++.h"

#include "ardour/luascripting.h"
#include "ardour/lua_script_params.h"
#include "ardour/luabindings.h"
#include "ardour/session_handle.h"

#include "lua/luastate.h"

#include "luasignal.h"

namespace luabridge {
	class LuaRef;
}

namespace Gtk {
	class Window;
}

typedef std::bitset<LuaSignal::LAST_SIGNAL> ActionHook;

class LuaCallback : public ARDOUR::SessionHandlePtr, public sigc::trackable
{
public:
	LuaCallback (ARDOUR::Session*, const std::string&, const std::string&, const ActionHook&, const ARDOUR::LuaScriptParamList&);
	LuaCallback (ARDOUR::Session*, XMLNode & node);
	~LuaCallback ();

	XMLNode& get_state () const;
	void set_session (ARDOUR::Session *);

	const PBD::ID& id () const { return _id; }
	const std::string& name () const { return _name; }
	ActionHook signals () const { return _signals; }
	bool lua_slot (std::string&, std::string&, ActionHook&, ARDOUR::LuaScriptParamList&);
	PBD::Signal<void()> drop_callback;

protected:
	void session_going_away ();

private:
	LuaState lua;

	PBD::ID _id;
	std::string _name;
	ActionHook _signals;

	void reconnect ();
	template <class T> void reconnect_object (T);
	void init ();

	luabridge::LuaRef * _lua_add;
	luabridge::LuaRef * _lua_get;
	luabridge::LuaRef * _lua_call;
	luabridge::LuaRef * _lua_save;
	luabridge::LuaRef * _lua_load;

	PBD::ScopedConnectionList _connections;

	template <typename T, typename... C> void connect (enum LuaSignal::LuaSignal, T, PBD::Signal<void(C...)>*);
	template <typename T, typename... C> void proxy (enum LuaSignal::LuaSignal, T, C...);
};

typedef std::shared_ptr<LuaCallback> LuaCallbackPtr;
typedef std::map<PBD::ID, LuaCallbackPtr> LuaCallbackMap;



class LuaInstance : public PBD::ScopedConnectionList, public ARDOUR::SessionHandlePtr
{
public:
	static LuaInstance* instance();
	static void destroy_instance();
	~LuaInstance();

	static void register_classes (lua_State* L, bool sandbox);
	static void register_hooks (lua_State* L);
	static void bind_cairo (lua_State* L);
	static void bind_dialog (lua_State* L);

	static void render_action_icon (cairo_t* cr, int w, int h, uint32_t c, void* i);

	void set_session (ARDOUR::Session* s);

	int set_state (const XMLNode&);
	XMLNode& get_action_state (void);
	XMLNode& get_hook_state (void);

	int load_state ();
	int save_state ();

	bool interactive_add (Gtk::Window&, ARDOUR::LuaScriptInfo::ScriptType, int);

	/* actions */
	void call_action (const int);
	void render_icon (int i, cairo_t*, int, int, uint32_t);

	bool set_lua_action (const int, const std::string&, const std::string&, const ARDOUR::LuaScriptParamList&);
	bool remove_lua_action (const int);
	bool lua_action_name (const int, std::string&);
	std::vector<std::string> lua_action_names ();
	bool lua_action (const int, std::string&, std::string&, ARDOUR::LuaScriptParamList&);
	bool lua_action_has_icon (const int);
	sigc::signal<void,int,std::string> ActionChanged;

	/* callbacks */
	bool register_lua_slot (const std::string&, const std::string&, const ARDOUR::LuaScriptParamList&);
	bool unregister_lua_slot (const PBD::ID&);
	std::vector<PBD::ID> lua_slots () const;
	bool lua_slot_name (const PBD::ID&, std::string&) const;
	std::vector<std::string> lua_slot_names () const;
	bool lua_slot (const PBD::ID&, std::string&, std::string&, ActionHook&, ARDOUR::LuaScriptParamList&);
	sigc::signal<void,PBD::ID,std::string,ActionHook> SlotChanged;

	static PBD::Signal<void()> LuaTimerS; // deci-seconds (Timer every 1s)
	static PBD::Signal<void()> LuaTimerDS; // deci-seconds (Timer every .1s)
	static PBD::Signal<void()> SetSession; // emitted when a session is loaded
	static PBD::Signal<void()> SelectionChanged; // emitted when editor selection changes

private:
	LuaInstance();
	static LuaInstance* _instance;

	void init ();
	void set_dirty ();
	void session_going_away ();
	void pre_seed_scripts ();
	void pre_seed_script (std::string const&, int&);

	LuaState lua;

	luabridge::LuaRef * _lua_call_action;
	luabridge::LuaRef * _lua_render_icon;
	luabridge::LuaRef * _lua_add_action;
	luabridge::LuaRef * _lua_del_action;
	luabridge::LuaRef * _lua_get_action;

	luabridge::LuaRef * _lua_load;
	luabridge::LuaRef * _lua_save;
	luabridge::LuaRef * _lua_clear;

	LuaCallbackMap _callbacks;
	PBD::ScopedConnectionList _slotcon;

	void selection_changed ();

	void every_second ();
	sigc::connection second_connection;

	void every_point_one_seconds ();
	sigc::connection point_one_second_connection;

};