import pytest
import numpy as np
from scipy.spatial import cKDTree

from damask import seeds
from damask import Geom

class TestSeeds:

    @pytest.mark.parametrize('grid',[None,np.ones(3,dtype='i')*10])
    def test_from_random(self,grid):
        N_seeds = np.random.randint(30,300)
        size = np.ones(3) + np.random.random(3)
        coords = seeds.from_random(size,N_seeds,grid)
        assert (0<=coords).all() and (coords<size).all()

    @pytest.mark.parametrize('periodic',[True,False])
    def test_from_Poisson_disc(self,periodic):
        N_seeds = np.random.randint(30,300)
        N_candidates = N_seeds//15
        distance = np.random.random()
        size = np.ones(3)*distance*N_seeds
        coords = seeds.from_Poisson_disc(size,N_seeds,N_candidates,distance,periodic=periodic)
        min_dists, _ = cKDTree(coords,boxsize=size).query(coords, 2) if periodic else \
                       cKDTree(coords).query(coords, 2)
        assert (0<= coords).all() and (coords<size).all() and np.min(min_dists[:,1])>=distance

    def test_from_geom(self):
        grid = np.random.randint(10,20,3)
        N_seeds = np.random.randint(30,300)
        size = np.ones(3) + np.random.random(3)
        coords = seeds.from_random(size,N_seeds,grid)
        geom_1 = Geom.from_Voronoi_tessellation(grid,size,coords)
        coords,material = seeds.from_geom(geom_1)
        geom_2 = Geom.from_Voronoi_tessellation(grid,size,coords,material)
        assert (geom_2.material==geom_1.material).all()