/********************************************************************

  File:          interface.cc
  Author:        Dana Vrajitoru

  Description:   Bringing the maze together.         
  Project:       A sprite moving through a maze application.

  Last updated:  February 10, 2011.

********************************************************************/

#include <GL/glut.h>
#include <cstdlib>
#include "bus.h"
#include "maze.h"
#include "interface.h"

const int vieww = 8, viewh = 6;
int viewoffx = -1, viewoffy=-1;
Bus the_bus;
Maze the_maze;

// Draws all the objects in the scene
void draw()
{
  glClear(GL_COLOR_BUFFER_BIT);
  glClearColor (0, 0.1, 0, 1.0);
  glPushMatrix();
  glTranslatef(float(viewoffx), float(viewoffy), 0);
  the_maze.draw();
  the_bus.draw();
  glPopMatrix();
  glutSwapBuffers();
}


// Callback function for an Ascii key being pressed
void key(unsigned char key, int x, int y)
{
  switch (key) {
  case 'q':
  case 'Q':
    exit(0);
  }
}

// Moves the bus in the given direction. If the move ends up in a
// wall, the bus is turned back.
void move_bus(Direction where)
{
  the_bus.move(where);
  if (the_maze.table[int(the_bus.x)][int(the_bus.y)] == wallCl)
    the_bus.move(opposite(where));
}

// Callback function for a special key being pressed
void spkey(int key, int x, int y)
{
  switch (key) {
  case GLUT_KEY_LEFT:
    move_bus(west);
    glutPostRedisplay();
    break;
  case GLUT_KEY_RIGHT:
    move_bus(east);
    glutPostRedisplay();
    break;
  case GLUT_KEY_UP:
    move_bus(north);
    glutPostRedisplay();
    break;
  case GLUT_KEY_DOWN:
    move_bus(south);
    glutPostRedisplay();
    break;
  }
}

// Initializes all the objects with their initial positions.
void init_obj()
{
  the_bus.init(4, 1);
  the_maze.init();
}

// Application parameters
void myinit()
{
  glMatrixMode(GL_PROJECTION);
  glLoadIdentity();
  gluOrtho2D(0, vieww, 0, viewh);
  glMatrixMode(GL_MODELVIEW);
  glClearColor (0, 0.1, 0, 1.0);
  glColor3f(1.0,0.0,0.0);
  glLineWidth(2);
  glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
  init_obj();
}