//------------------------------------------------------
// MainWindow.cpp -- implementation of MainWindow class
//------------------------------------------------------
#include <iostream>
using namespace std;

#include <stdlib.h>
#include <stdio.h>
#include <string.h>

#include <FL/Fl_Menu_Bar.h>
#include <FL/Fl_Group.h>
#include <FL/fl_ask.h>

#include "mainWindow.h"


MainWindow* MainWindow::theApp = NULL;


// ------------ Callbacks ------------ //


void quit_cb( Fl_Widget*, void* )
{
  exit( 0 );
}

void changeMode_cb( Fl_Widget*, int newmode )
{
  // Since changeMode_cb is a stand-alone function,
  // we have to use MainWindow::getTheApp() to get
  // a pointer to the running instance of MainWindow

  (MainWindow::getTheApp())->changeMode( newmode );
}


// ------------ MainWindow definitions ------------ //


MainWindow::MainWindow()
{
  // Most FL_ constructors are ( x position, y position, width, height, ...)

  // Every Fl object created between here and win->end() is
  // placed in the window
  win = new Fl_Window( 200, 200, 720, 590, "JDraw v1.0" );

  // Create the OpenGL drawing area
  glwidget = new GLWidget( 10, 40, 700, 500 );

  // Create the menu bar
  Fl_Menu_Bar* menu = new Fl_Menu_Bar( 0, 0, 720, 30 );
  menu->box( FL_PLASTIC_UP_BOX );

  // add( "menu/item", shortcut, callback, data for the callback )
  menu->add( "&File/&Quit", FL_CTRL + 'q',
             (Fl_Callback *)quit_cb );
  menu->add( "&Draw/Draw &Line", FL_CTRL + 'l',
             (Fl_Callback *)changeMode_cb, (void*)GLWidget::DRAW_LINE );
  menu->add( "&Draw/Draw &Freehand", FL_CTRL + 'f',
             (Fl_Callback *)changeMode_cb, (void*)GLWidget::DRAW_FREE );
  menu->add( "&Draw/Draw &Texture", FL_CTRL + 't',
             (Fl_Callback *)changeMode_cb, (void*)GLWidget::DRAW_IMAGE );
  menu->add( "&Draw/&Clear Screen", FL_CTRL + 'c',
             (Fl_Callback *)changeMode_cb, (void*)GLWidget::CLEAR_SCREEN );

  // Create the label under the drawing area
  label = new Fl_Output( 10, 550, 700, 30 );
  label->box( FL_PLASTIC_UP_BOX );
  label->color( FL_BACKGROUND_COLOR );
  label->cursor_color( FL_BACKGROUND_COLOR );
  label->value( "Waiting for name..." );

  // We're done adding items to the window
  win->end();
  win->size_range(100,100);

  // Point our static MainWindow pointer to
  // this running instance
  theApp = this;
}

MainWindow::~MainWindow()
{
  delete glwidget, label, win;
}

void MainWindow::show( int argc, char **argv )
{
  // Pass the show() command on to our window
  win->show( argc, argv );
}

void MainWindow::getName()
{
  char newlabel[128];

  // fl_input brings up a dialog box with a text input and
  // "Ok" and "Cancel" buttons. Clicking "Ok" will return 
  // the string in the edit box and clicking "Cancel" will
  // return null.
  const char* name = fl_input( "Please enter your name", "" );

  if( !name || !strcmp( name, "" ) )
    sprintf( newlabel, "Hi anonymous person! " );
  else
    sprintf( newlabel, "Hi %s! ", name );


  strcat( newlabel, "Please select an option from the Draw menu." );
  label->value( newlabel );
}

void MainWindow::changeMode( int newmode )
{
	cout << "in MainWindow::changeMode()" << endl << flush; 
  glwidget->changeMode( (GLWidget::DrawMode)newmode );
  
  char newlabel[128];

  switch( newmode )
  {
    case GLWidget::DRAW_LINE:
      sprintf( newlabel, "Pick any two points on the canvas to draw a line." );
      break;
    
    case GLWidget::DRAW_FREE:
      sprintf( newlabel, "Click and drag the mouse to draw freehand." );
      break;

    case GLWidget::DRAW_IMAGE:
      sprintf( newlabel, "Illlustrates use of GL Textures." );
      break;
    
    case GLWidget::CLEAR_SCREEN:
      sprintf( newlabel, "Please select an option from the Draw menu." );
      break;
  }

  label->value( newlabel );
}