// Copyright (C) 2010, Guy Barrand. All rights reserved.
// See the file tools.license for terms.

#ifndef toolx_X11_sg_viewer
#define toolx_X11_sg_viewer

#ifndef GL_GLEXT_LEGACY
#define GL_GLEXT_LEGACY
#endif
#include <GL/gl.h>

#ifndef GL_GLEXT_PROTOTYPES
#define GL_GLEXT_PROTOTYPES
#endif
#include <GL/glext.h>

#include "session"

#include "../GL/gl_functions"

#include "../sg/GL_action"
#include "../sg/GL_viewer"

namespace toolx {
namespace sg {
  using GL_action = GL_action_T<GL::gl_functions>;
  using GL_manager = GL_manager_T<GL::gl_functions>;
  using GL_viewer = GL_viewer_T<GL_manager,GL_action>;
}}

#include "simple_dispatcher"

#include <tools/sg/device_interactor>

namespace toolx {
namespace X11 {

class sg_viewer: public sg::GL_viewer {
  typedef sg::GL_viewer parent;
private:
  class dispatcher : public simple_dispatcher {
    typedef simple_dispatcher parent;
  public:
    virtual bool dispatch(XEvent& a_event) {
      if(parent::dispatch(a_event)) return true;
      bool shift_modifier = a_event.xkey.state & ShiftMask;
      bool control_modifier = a_event.xkey.state & ControlMask;
      if(a_event.type==ButtonPress && a_event.xbutton.button==1) {
        if(!m_viewer.device_interactor()) return false;
        tools::sg::mouse_down_event event(a_event.xbutton.x,a_event.xbutton.y,shift_modifier,control_modifier);
        m_viewer.device_interactor()->mouse_press(event);
        return true;
      } else if(a_event.type==ButtonRelease && a_event.xbutton.button==1) {
        if(!m_viewer.device_interactor()) return false;
        tools::sg::mouse_up_event event(a_event.xbutton.x,a_event.xbutton.y,shift_modifier,control_modifier);
        m_viewer.device_interactor()->mouse_release(event);
        return true;
      } else if(a_event.type==MotionNotify) {
        if(!m_viewer.device_interactor()) return false;
        if((a_event.xmotion.state & Button1MotionMask)==Button1MotionMask) {
          tools::sg::mouse_move_event event(a_event.xmotion.x,a_event.xmotion.y,shift_modifier,control_modifier,0,0,false);
          m_viewer.device_interactor()->mouse_move(event);
        }
      } else if((a_event.type==ButtonPress)&&(a_event.xbutton.button==4)) { // mouse scrollwheel down :
        if(!m_viewer.device_interactor()) return false;
        tools::sg::wheel_rotate_event event(8,a_event.xbutton.x,a_event.xbutton.y,shift_modifier,control_modifier);  //8=cooking.
        m_viewer.device_interactor()->wheel_rotate(event);
        return true;
      } else if((a_event.type==ButtonPress)&&(a_event.xbutton.button==5)) { // mouse scrollwheel up :
        if(!m_viewer.device_interactor()) return false;
        tools::sg::wheel_rotate_event event(-8,a_event.xbutton.x,a_event.xbutton.y,shift_modifier,control_modifier);  //8=cooking.
        m_viewer.device_interactor()->wheel_rotate(event);
        return true;
      }
      return false;
    }
    virtual void win_render() {m_viewer.win_render();}
    virtual void set_size(unsigned int a_width,unsigned int a_height) {m_viewer.set_size(a_width,a_height);}
    virtual dispatcher* copy() const {return new dispatcher(*this);}
  public:
    dispatcher(sg_viewer& a_viewer)
    :parent(a_viewer.m_session,a_viewer.m_win)
    ,m_viewer(a_viewer){}
    virtual ~dispatcher(){}
  protected:
    dispatcher(const dispatcher& a_from)
    :parent(a_from)
    ,m_viewer(a_from.m_viewer)
    {}
    dispatcher& operator=(const dispatcher& a_from) {
      parent::operator=(a_from);
      return *this;
    }
  protected:
    sg_viewer& m_viewer;
  };

public:
  sg_viewer(session& a_session,
            int a_x = 0,int a_y = 0,
            unsigned int a_width = 500,unsigned int a_height = 500,
            const std::string& a_win_title = "")
  :parent(a_session.out(),a_width,a_height)
  ,m_session(a_session)
  ,m_win(0)
  ,m_interactor(0)
  {
    if(!m_session.display()) return; //throw
    m_win = m_session.create_window(a_win_title.c_str(),a_x,a_y,a_width,a_height);
    if(!m_win) return; //throw
    m_session.add_dispatcher(new dispatcher(*this));
  }
  virtual ~sg_viewer() {
    if(m_win) {
      m_session.remove_dispatchers_with_window(m_win);
      m_session.delete_window(m_win);
      m_session.sync();
    }
  }
protected:
  sg_viewer(const sg_viewer& a_from)
  :parent(a_from)
  ,m_session(a_from.m_session)
  ,m_win(a_from.m_win)
  ,m_interactor(0)
  {}
  sg_viewer& operator=(const sg_viewer& a_from){
    parent::operator=(a_from);
    m_win = a_from.m_win;
    return *this;
  }
public:
  bool has_window() const {return m_win?true:false;} //for SWIG

  Window window() const {return m_win;}

  bool show() {
    if(!m_win) return false;
    m_session.show_window(m_win);
    return true;
  }

  void win_render() {
    if(!m_win) return;
    if(::glXMakeCurrent(m_session.display(),m_win,m_session.context())==False){
      m_session.out() << "toolx::X11::sg_viewer::win_render : glXMakeCurrent failed." << std::endl;
      return;
    }
    render(); //viewer::render()
    ::glXSwapBuffers(m_session.display(),m_win);
    if(::glXMakeCurrent(m_session.display(),None,NULL)==False){
      m_session.out() << "toolx::X11::sg_viewer::win_render : glXMakeCurrent(None,NULL) failed." << std::endl;
    }
    m_session.sync();
  }

  void emit_win_render() {
    if(!m_win) return;
    m_session.post_expose(m_win);
  }

  bool window_size(unsigned int& a_w,unsigned int& a_h) {
    if(!m_win) {a_w = 0;a_h = 0;return false;}
    int width,height;
    if(!m_session.window_size(m_win,width,height)) {a_w = 0;a_h = 0;return false;}
    a_w = (unsigned int)width;
    a_h = (unsigned int)height;
    return true;
  }
  void render_area_size(unsigned int& a_w,unsigned int& a_h) {
    a_w = parent::width();
    a_h = parent::height();
  }

  void set_device_interactor(tools::sg::device_interactor* a_interactor) {m_interactor = a_interactor;}

public:
  tools::sg::device_interactor* device_interactor() {return m_interactor;}
protected:
  session& m_session;
  Window m_win;
  tools::sg::device_interactor* m_interactor;
};

}}

#endif