/*
    Copyright (C) 2013 Paul Davis

    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., 675 Mass Ave, Cambridge, MA 02139, USA.

*/

#ifndef __gtk2_ardour_window_manager_h__
#define __gtk2_ardour_window_manager_h__

#include <string>
#include <map>

#include <boost/function.hpp>
#include <glibmm/refptr.h>
#include <sigc++/trackable.h>

class XMLNode;

namespace Gtk {
	class Window;
	class Action;
}

namespace Gtkmm2ext {
	class VisibilityTracker;
}

namespace ARDOUR {
	class Session;
	class SessionHandlePtr;
}

namespace WM {

class ProxyBase;

class Manager : public ARDOUR::SessionHandlePtr
{
  public:
    static Manager& instance();

    void register_window (ProxyBase*);
    void remove (const ProxyBase*);
    void toggle_window (ProxyBase*);
    void show_visible () const;
    void set_session (ARDOUR::Session*);
    void add_state (XMLNode&) const;

    /* HACK HACK HACK */
    void set_transient_for (Gtk::Window*);
    Gtk::Window* transient_parent() const { return current_transient_parent; }

  private:
    typedef std::list<ProxyBase*> Windows;
    Windows _windows;
    Glib::RefPtr<Gtk::ActionGroup> window_actions;
    Gtk::Window* current_transient_parent;

    Manager();
    ~Manager();

    static Manager* _instance;
};
	
class ProxyBase : public ARDOUR::SessionHandlePtr, public sigc::trackable {
  public:
    ProxyBase (const std::string& name, const std::string& menu_name);
    ProxyBase (const std::string& name, const std::string& menu_name, const XMLNode&);
    virtual ~ProxyBase();
    
    void show ();
    void show_all ();
    void hide ();
    void present ();
    void maybe_show ();
    
    bool visible() const { return _visible; }
    const std::string& name() const { return _name; }
    const std::string& menu_name() const { return _menu_name; }
    
    std::string action_name() const;
    void set_action (Glib::RefPtr<Gtk::Action>);
    Glib::RefPtr<Gtk::Action> action() const { return _action; };
    
    void drop_window ();
    void use_window (Gtk::Window&);
    
    virtual Gtk::Window* get (bool create = false) = 0;
    
    virtual void toggle ();
    
    void set_state (const XMLNode&);
    XMLNode& get_state () const;
    
    virtual ARDOUR::SessionHandlePtr* session_handle () = 0;

    operator bool() const { return _window != 0; }
    
  protected:
    std::string  _name;
    std::string  _menu_name;
    Glib::RefPtr<Gtk::Action> _action;
    Gtk::Window* _window;
    mutable bool _visible; ///< true if the window should be visible on startup
    mutable int  _x_off; ///< x position
    mutable int  _y_off; ///< y position
    mutable int  _width; ///< width
    mutable int  _height; ///< height
    Gtkmm2ext::VisibilityTracker* vistracker;

    void save_pos_and_size ();
    bool delete_event_handler (GdkEventAny *ev);
    
    void setup ();
};
	
class ProxyTemporary: public ProxyBase {
  public:
    ProxyTemporary (const std::string& name, Gtk::Window* win);
    ~ProxyTemporary();
    
    Gtk::Window* get (bool create = false) { 
	    (void) create;
	    return _window;
    }
    
    Gtk::Window* operator->() { 
	    return _window;
    }

    ARDOUR::SessionHandlePtr* session_handle ();
};
	
template<typename T>
class ProxyWithConstructor: public ProxyBase {
  public:
    ProxyWithConstructor (const std::string& name, const std::string& menu_name, const boost::function<T*()>& c)
	    : ProxyBase (name, menu_name) , creator (c) {}
	
    ProxyWithConstructor (const std::string& name, const std::string& menu_name, const boost::function<T*()>& c, const XMLNode* node)
	    : ProxyBase (name, menu_name, *node) , creator (c) {}
	
    Gtk::Window* get (bool create = false) { 
	    if (!_window) {
		    if (!create) {
			    return 0;
		    }

			_window = dynamic_cast<Gtk::Window*> (creator ());

		    if (_window) {
			    setup ();
		    }	
	    }

	    return _window;
    }

    T* operator->() { 
	    return dynamic_cast<T*> (get (true));
    }

    ARDOUR::SessionHandlePtr* session_handle () {
	    /* may return null */
	    return dynamic_cast<T*> (_window);
    }

    void set_session(ARDOUR::Session *s) {
        SessionHandlePtr::set_session (s);
        ARDOUR::SessionHandlePtr* sp = session_handle ();
        if (sp) {
            sp->set_session (s);
            dynamic_cast<T*>(_window)->set_session(s);
        }
    }

  private:
    boost::function<T*()>	creator;
};

template<typename T>
class Proxy : public ProxyBase {
  public:
    Proxy (const std::string& name, const std::string& menu_name)
	    : ProxyBase (name, menu_name) {}

    Proxy (const std::string& name, const std::string& menu_name, const XMLNode* node)
	    : ProxyBase (name, menu_name, *node)  {}
	
    Gtk::Window* get (bool create = false) { 
	    if (!_window) {
		    if (!create) {
			    return 0;
		    }

		    _window = new T ();

		    if (_window) {
			    setup ();
		    }	
	    }

	    return _window;
    }

    T* operator->() { 
	    return dynamic_cast<T*> (get(true));
    }

    ARDOUR::SessionHandlePtr* session_handle () {
	    /* may return null */
	    return dynamic_cast<T*> (_window);
    }

    void set_session(ARDOUR::Session *s) {
        SessionHandlePtr::set_session (s);
        ARDOUR::SessionHandlePtr* sp = session_handle ();
        if (sp) {
            sp->set_session (s);
            dynamic_cast<T*>(_window)->set_session(s);
        }
    }

  private:
    boost::function<T*()>	creator;
};
    
} /* namespace */

#endif /* __gtk2_ardour_window_manager_h__ */