from __future__ import division, absolute_import, print_function

from numpy.testing import *
import numpy as np
from numpy import ( array, ones, r_, mgrid, unravel_index, zeros, where,
                    ndenumerate, fill_diagonal, diag_indices,
                    diag_indices_from, s_, index_exp, ndindex )

class TestRavelUnravelIndex(TestCase):
    def test_basic(self):
        assert_equal(np.unravel_index(2,(2,2)), (1,0))
        assert_equal(np.ravel_multi_index((1,0),(2,2)), 2)
        assert_equal(np.unravel_index(254,(17,94)), (2,66))
        assert_equal(np.ravel_multi_index((2,66),(17,94)), 254)
        assert_raises(ValueError, np.unravel_index, -1, (2,2))
        assert_raises(TypeError, np.unravel_index, 0.5, (2,2))
        assert_raises(ValueError, np.unravel_index, 4, (2,2))
        assert_raises(ValueError, np.ravel_multi_index, (-3,1), (2,2))
        assert_raises(ValueError, np.ravel_multi_index, (2,1), (2,2))
        assert_raises(ValueError, np.ravel_multi_index, (0,-3), (2,2))
        assert_raises(ValueError, np.ravel_multi_index, (0,2), (2,2))
        assert_raises(TypeError, np.ravel_multi_index, (0.1,0.), (2,2))

        assert_equal(np.unravel_index((2*3 + 1)*6 + 4, (4,3,6)), [2,1,4])
        assert_equal(np.ravel_multi_index([2,1,4], (4,3,6)), (2*3 + 1)*6 + 4)

        arr = np.array([[3,6,6],[4,5,1]])
        assert_equal(np.ravel_multi_index(arr, (7,6)), [22,41,37])
        assert_equal(np.ravel_multi_index(arr, (7,6), order='F'), [31,41,13])
        assert_equal(np.ravel_multi_index(arr, (4,6), mode='clip'), [22,23,19])
        assert_equal(np.ravel_multi_index(arr, (4,4), mode=('clip','wrap')),
                        [12,13,13])
        assert_equal(np.ravel_multi_index((3,1,4,1), (6,7,8,9)), 1621)

        assert_equal(np.unravel_index(np.array([22, 41, 37]), (7,6)),
                        [[3, 6, 6],[4, 5, 1]])
        assert_equal(np.unravel_index(np.array([31, 41, 13]), (7,6), order='F'),
                        [[3, 6, 6], [4, 5, 1]])
        assert_equal(np.unravel_index(1621, (6,7,8,9)), [3,1,4,1])

    def test_dtypes(self):
        # Test with different data types
        for dtype in [np.int16, np.uint16, np.int32,
                      np.uint32, np.int64, np.uint64]:
            coords = np.array([[1,0,1,2,3,4],[1,6,1,3,2,0]], dtype=dtype)
            shape = (5,8)
            uncoords = 8*coords[0]+coords[1]
            assert_equal(np.ravel_multi_index(coords, shape), uncoords)
            assert_equal(coords, np.unravel_index(uncoords, shape))
            uncoords = coords[0]+5*coords[1]
            assert_equal(np.ravel_multi_index(coords, shape, order='F'), uncoords)
            assert_equal(coords, np.unravel_index(uncoords, shape, order='F'))

            coords = np.array([[1,0,1,2,3,4],[1,6,1,3,2,0],[1,3,1,0,9,5]],
                              dtype=dtype)
            shape = (5,8,10)
            uncoords = 10*(8*coords[0]+coords[1])+coords[2]
            assert_equal(np.ravel_multi_index(coords, shape), uncoords)
            assert_equal(coords, np.unravel_index(uncoords, shape))
            uncoords = coords[0]+5*(coords[1]+8*coords[2])
            assert_equal(np.ravel_multi_index(coords, shape, order='F'), uncoords)
            assert_equal(coords, np.unravel_index(uncoords, shape, order='F'))

    def test_clipmodes(self):
        # Test clipmodes
        assert_equal(np.ravel_multi_index([5,1,-1,2], (4,3,7,12), mode='wrap'),
                     np.ravel_multi_index([1,1,6,2], (4,3,7,12)))
        assert_equal(np.ravel_multi_index([5,1,-1,2], (4,3,7,12),
                                 mode=('wrap','raise','clip','raise')),
                     np.ravel_multi_index([1,1,0,2], (4,3,7,12)))
        assert_raises(ValueError, np.ravel_multi_index, [5,1,-1,2], (4,3,7,12))

class TestGrid(TestCase):
    def test_basic(self):
        a = mgrid[-1:1:10j]
        b = mgrid[-1:1:0.1]
        assert_(a.shape == (10,))
        assert_(b.shape == (20,))
        assert_(a[0] == -1)
        assert_almost_equal(a[-1],1)
        assert_(b[0] == -1)
        assert_almost_equal(b[1]-b[0],0.1,11)
        assert_almost_equal(b[-1],b[0]+19*0.1,11)
        assert_almost_equal(a[1]-a[0],2.0/9.0,11)

    def test_linspace_equivalence(self):
        y,st = np.linspace(2,10,retstep=1)
        assert_almost_equal(st,8/49.0)
        assert_array_almost_equal(y,mgrid[2:10:50j],13)

    def test_nd(self):
        c = mgrid[-1:1:10j,-2:2:10j]
        d = mgrid[-1:1:0.1,-2:2:0.2]
        assert_(c.shape == (2,10,10))
        assert_(d.shape == (2,20,20))
        assert_array_equal(c[0][0,:],-ones(10,'d'))
        assert_array_equal(c[1][:,0],-2*ones(10,'d'))
        assert_array_almost_equal(c[0][-1,:],ones(10,'d'),11)
        assert_array_almost_equal(c[1][:,-1],2*ones(10,'d'),11)
        assert_array_almost_equal(d[0,1,:]-d[0,0,:], 0.1*ones(20,'d'),11)
        assert_array_almost_equal(d[1,:,1]-d[1,:,0], 0.2*ones(20,'d'),11)


class TestConcatenator(TestCase):
    def test_1d(self):
        assert_array_equal(r_[1,2,3,4,5,6],array([1,2,3,4,5,6]))
        b = ones(5)
        c = r_[b,0,0,b]
        assert_array_equal(c,[1,1,1,1,1,0,0,1,1,1,1,1])

    def test_mixed_type(self):
        g = r_[10.1, 1:10]
        assert_(g.dtype == 'f8')

    def test_more_mixed_type(self):
        g = r_[-10.1, array([1]), array([2,3,4]), 10.0]
        assert_(g.dtype == 'f8')

    def test_2d(self):
        b = rand(5,5)
        c = rand(5,5)
        d = r_['1',b,c]  # append columns
        assert_(d.shape == (5,10))
        assert_array_equal(d[:,:5],b)
        assert_array_equal(d[:,5:],c)
        d = r_[b,c]
        assert_(d.shape == (10,5))
        assert_array_equal(d[:5,:],b)
        assert_array_equal(d[5:,:],c)


class TestNdenumerate(TestCase):
    def test_basic(self):
        a = array([[1,2], [3,4]])
        assert_equal(list(ndenumerate(a)),
                     [((0,0), 1), ((0,1), 2), ((1,0), 3), ((1,1), 4)])


class TestIndexExpression(TestCase):
    def test_regression_1(self):
        # ticket #1196
        a = np.arange(2)
        assert_equal(a[:-1], a[s_[:-1]])
        assert_equal(a[:-1], a[index_exp[:-1]])

    def test_simple_1(self):
        a = np.random.rand(4,5,6)

        assert_equal(a[:,:3,[1,2]], a[index_exp[:,:3,[1,2]]])
        assert_equal(a[:,:3,[1,2]], a[s_[:,:3,[1,2]]])

def test_c_():
    a = np.c_[np.array([[1,2,3]]), 0, 0, np.array([[4,5,6]])]
    assert_equal(a, [[1, 2, 3, 0, 0, 4, 5, 6]])

def test_fill_diagonal():
    a = zeros((3, 3),int)
    fill_diagonal(a, 5)
    yield (assert_array_equal, a,
           array([[5, 0, 0],
                  [0, 5, 0],
                  [0, 0, 5]]))

    #Test tall matrix
    a = zeros((10, 3),int)
    fill_diagonal(a, 5)
    yield (assert_array_equal, a,
           array([[5, 0, 0],
                  [0, 5, 0],
                  [0, 0, 5],
                  [0, 0, 0],
                  [0, 0, 0],
                  [0, 0, 0],
                  [0, 0, 0],
                  [0, 0, 0],
                  [0, 0, 0],
                  [0, 0, 0]]))

    #Test tall matrix wrap
    a = zeros((10, 3),int)
    fill_diagonal(a, 5, True)
    yield (assert_array_equal, a,
           array([[5, 0, 0],
                  [0, 5, 0],
                  [0, 0, 5],
                  [0, 0, 0],
                  [5, 0, 0],
                  [0, 5, 0],
                  [0, 0, 5],
                  [0, 0, 0],
                  [5, 0, 0],
                  [0, 5, 0]]))

    #Test wide matrix
    a = zeros((3, 10),int)
    fill_diagonal(a, 5)
    yield (assert_array_equal, a,
           array([[5, 0, 0, 0, 0, 0, 0, 0, 0, 0],
                  [0, 5, 0, 0, 0, 0, 0, 0, 0, 0],
                  [0, 0, 5, 0, 0, 0, 0, 0, 0, 0]]))

    # The same function can operate on a 4-d array:
    a = zeros((3, 3, 3, 3), int)
    fill_diagonal(a, 4)
    i = array([0, 1, 2])
    yield (assert_equal, where(a != 0), (i, i, i, i))


def test_diag_indices():
    di = diag_indices(4)
    a = array([[1, 2, 3, 4],
               [5, 6, 7, 8],
               [9, 10, 11, 12],
               [13, 14, 15, 16]])
    a[di] = 100
    yield (assert_array_equal, a,
           array([[100,   2,   3,   4],
                  [  5, 100,   7,   8],
                  [  9,  10, 100,  12],
                  [ 13,  14,  15, 100]]))

    # Now, we create indices to manipulate a 3-d array:
    d3 = diag_indices(2, 3)

    # And use it to set the diagonal of a zeros array to 1:
    a = zeros((2, 2, 2),int)
    a[d3] = 1
    yield (assert_array_equal, a,
           array([[[1, 0],
                   [0, 0]],

                  [[0, 0],
                   [0, 1]]]) )

def test_diag_indices_from():
    x = np.random.random((4, 4))
    r, c = diag_indices_from(x)
    assert_array_equal(r, np.arange(4))
    assert_array_equal(c, np.arange(4))


def test_ndindex():
    x = list(np.ndindex(1, 2, 3))
    expected = [ix for ix, e in np.ndenumerate(np.zeros((1, 2, 3)))]
    assert_array_equal(x, expected)

    x = list(np.ndindex((1, 2, 3)))
    assert_array_equal(x, expected)

    # Test use of scalars and tuples
    x = list(np.ndindex((3,)))
    assert_array_equal(x, list(np.ndindex(3)))

    # Make sure size argument is optional
    x = list(np.ndindex())
    assert_equal(x, [()])

    x = list(np.ndindex(()))
    assert_equal(x, [()])    


if __name__ == "__main__":
    run_module_suite()