#include <iostream>
#include "vgl.h"

using namespace std;

bool UI_Verbose_G = false;
extern GLenum Line_Mode_G;

void ChangeState(int & state);

void SpecialKeypress(int key, int x, int y) {

   if (UI_Verbose_G) {
     switch (key) {
	case GLUT_KEY_F1: cout << "F1 function key." << endl; break;
	case GLUT_KEY_F2: cout << "F2 function key." << endl; break;
	case GLUT_KEY_F3: cout << "F3 function key." << endl; break;
	case GLUT_KEY_F4: cout << "F4 function key." << endl; break;
	case GLUT_KEY_F5: cout << "F5 function key." << endl; break;
	case GLUT_KEY_F6: cout << "F6 function key." << endl; break;
	case GLUT_KEY_F7: cout << "F7 function key." << endl; break;
	case GLUT_KEY_F8: cout << "F8 function key." << endl; break;
	case GLUT_KEY_F9: cout << "F9 function key." << endl; break;
	case GLUT_KEY_F10: cout << "F10 function key." << endl; break;
	case GLUT_KEY_F11: cout << "F11 function key." << endl; break;
	case GLUT_KEY_F12: cout << "F12 function key." << endl; break;
	case GLUT_KEY_LEFT: cout << "Left directional key." << endl; break;
	case GLUT_KEY_UP: cout << "Up directional key." << endl; break;
	case GLUT_KEY_RIGHT: cout << "Right directional key." << endl; break;
	case GLUT_KEY_DOWN: cout << "Down directional key." 
                                 << endl; break;
	case GLUT_KEY_PAGE_UP: cout << "Page up directional key."
                                    << endl; break;
	case GLUT_KEY_PAGE_DOWN: cout << "Page down directional key."
                                      << endl; break;
	case GLUT_KEY_HOME: cout << "Home directional key." << endl; break;
	case GLUT_KEY_END: cout << "End directional key." << endl; break;
	case GLUT_KEY_INSERT: cout << "Inset directional key." << endl; break;
        default:
   	   cout << "Unknown Key " << endl;
     }
   }
   return;
}

void KeyUp(unsigned char key, int x, int y) {
   if (UI_Verbose_G) {
       cout << "The " << key << " key was released" << endl;
   }
   return;
}

void SpecialUp(int key, int x, int y) {
   if (UI_Verbose_G) {
       cout << "A special was released " << endl;
   }
   return;
}

void KeyHelp() {
    cout << endl;
    cout << "Keys " << endl;
    cout << "\tq,Q\tQuit" << endl;
    cout << "\tc\tChange Mode" << endl;
    cout << "\tr,R\tRedisplay" << endl;
    cout << "\tv\tToggle Verbose" << endl;
    cout << "\th,?\tHelp" << endl;
    cout << endl;

    return;
}

void Keypress(unsigned char key, int x, int y) {
   static int state = 1;

   if (UI_Verbose_G) {
   
       cout << "The " << key << " key was pressed at (" << x << "," << y 
            << ")" << endl;
   } 

   bool redisplay = false;
   switch (key) {
      case 'h': 
      case '?': KeyHelp();
                break;
      case 'Q': 
      case 'q': exit(0);

      case 'c': ChangeState(state);
                break;

      case 'r':
      case 'R': redisplay = true;
                break;

      case 'v': UI_Verbose_G = !UI_Verbose_G;
                break;

      default:
      		cerr << "Unhandled keypress for key '" << key << "'" << endl;
   }

   if (redisplay) {
      glutPostRedisplay();
   }

   return;
}

void ChangeState(int & state) {

    switch(state) {
        case 0: Line_Mode_G = GL_POINTS;
	        cout << "Drawing Points " << endl;
	        break;
        case 1: Line_Mode_G = GL_LINES; 
	        cout << "Drawing Lines " << endl;
	        break;
        case 2: Line_Mode_G = GL_LINE_STRIP; 
	        cout << "Drawing Line Strip " << endl;
	        break;
        case 3: Line_Mode_G = GL_LINE_LOOP; 
	        cout << "Drawing Line Loop " << endl;
	        break;
        case 4: Line_Mode_G = GL_TRIANGLES; 
	        cout << "Drawing Triangles " << endl;
	        break;
        case 5: Line_Mode_G = GL_TRIANGLE_STRIP; 
	        cout << "Drawing Triangle Strip " << endl;
	        break;
	default:
        case 6: Line_Mode_G = GL_TRIANGLE_FAN; 
	        cout << "Drawing Triangle Fan " << endl;
	        state = -1; 
	        break;
    }
    state++;

    return;
}