import sys, time, math, os
from OpenGL.GL import *
from OpenGL.GLU import *
from OpenGL.GLUT import *
from dmsgl import *

dir = os.getcwd() + os.sep + 'planet' + os.sep

camera = PerspCamera()
camera.moveBackward(5)

textures = []
currentTexture = 0

for i in range(0,12):
    tex = Texture2D(dir + 'planet%d.tif' % i)
    textures.append(tex)

def draw():
    Color.X11['DeepSkyBlue'].clear()
    
    camera.apply()

    textures[currentTexture].apply()
    Color.White.apply()
    glBegin(GL_QUADS)
    glTexCoord2f(0, 0)
    glVertex2f(-1, -1)
    glTexCoord2f(1, 0)
    glVertex2f(1, -1)
    glTexCoord2f(1, 1)
    glVertex2f(1, 1)
    glTexCoord2f(0, 1)
    glVertex2f(-1, 1)
    glEnd()
    tex.disable()

    glutSwapBuffers()


def keyboard(key, x, y):
    global viewDistance
    if key == chr(27):
        sys.exit(0)
    elif key == '.':
        camera.moveForward(1)
    elif key == ',':
        camera.moveBackward(1)

def specialkey(key,x,y):
    global cameraVelX, cameraVelY
    if key == GLUT_KEY_LEFT:
        cameraVelY += 90
    elif key == GLUT_KEY_RIGHT:
        cameraVelY -= 90
    elif key == GLUT_KEY_UP:
        cameraVelX += 90
    elif key == GLUT_KEY_DOWN:
        cameraVelX -= 90

def specialkeyUp(key,x,y):
    global cameraVelX, cameraVelY
    if key == GLUT_KEY_LEFT:
        cameraVelY -= 90
    elif key == GLUT_KEY_RIGHT:
        cameraVelY += 90
    elif key == GLUT_KEY_UP:
        cameraVelX -= 90
    elif key == GLUT_KEY_DOWN:
        cameraVelX += 90


cameraVelX = 0.0
cameraVelY = 0.0
prevTime = time.time()

def update():
    global viewRotX, viewRotY, cameraVelX, cameraVelY, currentTexture
    global prevTime
    t = time.time()
    dt = t - prevTime
    prevTime = t
    camera.pitch(cameraVelX * dt)
    camera.turn(cameraVelY * dt)
    currentTexture = (currentTexture + 1) % len(textures)
    glutPostRedisplay()

glutInit([])
glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH)
glutInitWindowSize(400,400)
glutCreateWindow(sys.argv[0])
glutDisplayFunc(draw)
glutKeyboardFunc(keyboard)
glutSpecialFunc(specialkey)
glutSpecialUpFunc(specialkeyUp)
glutIgnoreKeyRepeat(1)
glutIdleFunc(update)
glEnable(GL_DEPTH_TEST)
glutMainLoop()