from itertools import product

import numpy as np

from interp.grid.delaunay import dgrid as basegrid

class rect_grid(basegrid):
  def __init__(self, xres = 5, yres = 5, zres = 5):
    xmin  = 0.0
    xmax  = 1.0
    xspan = xmax - xmin
    xdel  = xspan / float(xres - 1)

    ymin  = 0.0
    ymay  = 1.0
    yspan = ymay - ymin
    ydel  = yspan / float(yres - 1)

    zmin  = 0.0
    zmaz  = 1.0
    zspan = zmaz - zmin
    zdel  = zspan / float(zres - 1)

    verts = []
    q     = np.zeros(xres * yres * zres)
    for x in xrange(xres):
      cur_x = xmin + (x * xdel)
      for y in xrange(yres):
        cur_y = ymin + (y * ydel)
        for z in xrange(zres):
          cur_z = zmin + (z * zdel)
          verts.append([cur_x, cur_y, cur_z])

    basegrid.__init__(self, verts, q)



class random_grid(rect_grid):
  def __init__(self, num_verts = 100):
    verts = []

    appx_side_res = int(np.power(num_verts, 1/3.0))
    delta = 1.0 / float(appx_side_res)

    # populate all corners
    verts = [i for i in product((0,1), repeat = 3)]


    # populate the edges (bottom and top squares)
    for z in (0,1):
      for x in xrange(1, appx_side_res):
        cur_x = x * delta
        for cur_y in (0, 1):
          new_point = [cur_x, cur_y, z]
          verts.append(new_point)

      for y in xrange(1, appx_side_res):
        cur_y = y * delta
        for cur_x in (0, 1):
          new_point = [cur_x, cur_y, z]
          verts.append(new_point)

    # populate side edges
    for x in (0,1):
      for y in (0,1):
        for z in xrange(1, appx_side_res):
          cur_z = z * delta
          verts.append((x,y,cur_z))

    verts.extend(np.random.random((num_verts - 12 * appx_side_res, 3)))

    q = np.zeros(len(verts))
    basegrid.__init__(self, np.array(verts), q)