import os
import pytest

import numpy as np

from . import util


class TestParameters(util.F2PyTest):
    # Check that intent(in out) translates as intent(inout)
    sources = [
        util.getpath("tests", "src", "parameter", "constant_real.f90"),
        util.getpath("tests", "src", "parameter", "constant_integer.f90"),
        util.getpath("tests", "src", "parameter", "constant_both.f90"),
        util.getpath("tests", "src", "parameter", "constant_compound.f90"),
        util.getpath("tests", "src", "parameter", "constant_non_compound.f90"),
        util.getpath("tests", "src", "parameter", "constant_array.f90"),
    ]

    @pytest.mark.slow
    def test_constant_real_single(self):
        # non-contiguous should raise error
        x = np.arange(6, dtype=np.float32)[::2]
        pytest.raises(ValueError, self.module.foo_single, x)

        # check values with contiguous array
        x = np.arange(3, dtype=np.float32)
        self.module.foo_single(x)
        assert np.allclose(x, [0 + 1 + 2 * 3, 1, 2])

    @pytest.mark.slow
    def test_constant_real_double(self):
        # non-contiguous should raise error
        x = np.arange(6, dtype=np.float64)[::2]
        pytest.raises(ValueError, self.module.foo_double, x)

        # check values with contiguous array
        x = np.arange(3, dtype=np.float64)
        self.module.foo_double(x)
        assert np.allclose(x, [0 + 1 + 2 * 3, 1, 2])

    @pytest.mark.slow
    def test_constant_compound_int(self):
        # non-contiguous should raise error
        x = np.arange(6, dtype=np.int32)[::2]
        pytest.raises(ValueError, self.module.foo_compound_int, x)

        # check values with contiguous array
        x = np.arange(3, dtype=np.int32)
        self.module.foo_compound_int(x)
        assert np.allclose(x, [0 + 1 + 2 * 6, 1, 2])

    @pytest.mark.slow
    def test_constant_non_compound_int(self):
        # check values
        x = np.arange(4, dtype=np.int32)
        self.module.foo_non_compound_int(x)
        assert np.allclose(x, [0 + 1 + 2 + 3 * 4, 1, 2, 3])

    @pytest.mark.slow
    def test_constant_integer_int(self):
        # non-contiguous should raise error
        x = np.arange(6, dtype=np.int32)[::2]
        pytest.raises(ValueError, self.module.foo_int, x)

        # check values with contiguous array
        x = np.arange(3, dtype=np.int32)
        self.module.foo_int(x)
        assert np.allclose(x, [0 + 1 + 2 * 3, 1, 2])

    @pytest.mark.slow
    def test_constant_integer_long(self):
        # non-contiguous should raise error
        x = np.arange(6, dtype=np.int64)[::2]
        pytest.raises(ValueError, self.module.foo_long, x)

        # check values with contiguous array
        x = np.arange(3, dtype=np.int64)
        self.module.foo_long(x)
        assert np.allclose(x, [0 + 1 + 2 * 3, 1, 2])

    @pytest.mark.slow
    def test_constant_both(self):
        # non-contiguous should raise error
        x = np.arange(6, dtype=np.float64)[::2]
        pytest.raises(ValueError, self.module.foo, x)

        # check values with contiguous array
        x = np.arange(3, dtype=np.float64)
        self.module.foo(x)
        assert np.allclose(x, [0 + 1 * 3 * 3 + 2 * 3 * 3, 1 * 3, 2 * 3])

    @pytest.mark.slow
    def test_constant_no(self):
        # non-contiguous should raise error
        x = np.arange(6, dtype=np.float64)[::2]
        pytest.raises(ValueError, self.module.foo_no, x)

        # check values with contiguous array
        x = np.arange(3, dtype=np.float64)
        self.module.foo_no(x)
        assert np.allclose(x, [0 + 1 * 3 * 3 + 2 * 3 * 3, 1 * 3, 2 * 3])

    @pytest.mark.slow
    def test_constant_sum(self):
        # non-contiguous should raise error
        x = np.arange(6, dtype=np.float64)[::2]
        pytest.raises(ValueError, self.module.foo_sum, x)

        # check values with contiguous array
        x = np.arange(3, dtype=np.float64)
        self.module.foo_sum(x)
        assert np.allclose(x, [0 + 1 * 3 * 3 + 2 * 3 * 3, 1 * 3, 2 * 3])

    def test_constant_array(self):
        x = np.arange(3, dtype=np.float64)
        y = np.arange(5, dtype=np.float64)
        z = self.module.foo_array(x, y)
        assert np.allclose(x, [0.0, 1./10, 2./10])
        assert np.allclose(y, [0.0, 1.*10, 2.*10, 3.*10, 4.*10])
        assert np.allclose(z, 19.0)

    def test_constant_array_any_index(self):
        x = np.arange(6, dtype=np.float64)
        y = self.module.foo_array_any_index(x)
        assert np.allclose(y, x.reshape((2, 3), order='F'))

    def test_constant_array_delims(self):
        x = self.module.foo_array_delims()
        assert x == 9

