import OpenGL.GL as gl
from dusk.defs import defs
import colorsys

hue = [0.0]  # Mutable container for static hue

def drawSelectBox(x, y, z):
  w = float(defs.get('TILE_WIDTH'))
  h = float(defs.get('TILE_HEIGHT'))
  d = float(defs.get('TILE_DEPTH'))

  x = x * w
  y = y * h
  z = z * d

  # Center box.
  x -= w / 2.0
  y -= h / 2.0
  z -= d / 2.0

  # Define the 8 vertices of the cube with w=h=d=1
  vertices = [
    (x,     y,     z),      # 0: min corner
    (x+w,   y,     z),      # 1
    (x+w,   y+h,   z),      # 2
    (x,     y+h,   z),      # 3
    (x,     y,     z+d),    # 4
    (x+w,   y,     z+d),    # 5
    (x+w,   y+h,   z+d),    # 6
    (x,     y+h,   z+d)     # 7
  ]
  # List of edges as pairs of vertex indices
  edges = [
    (0, 1), (1, 2), (2, 3), (3, 0),  # bottom face
    (4, 5), (5, 6), (6, 7), (7, 4),  # top face
    (0, 4), (1, 5), (2, 6), (3, 7)   # vertical edges
  ]

  # Cycle hue
  hue[0] = (hue[0] + 0.01) % 1.0
  r, g, b = colorsys.hsv_to_rgb(hue[0], 1.0, 1.0)
  gl.glColor3f(r, g, b)
  gl.glLineWidth(2.0)
  gl.glBegin(gl.GL_LINES)
  for edge in edges:
    for vertex in edge:
        gl.glVertex3f(*vertices[vertex])
  gl.glEnd()