import numpy as np

from autoarray.structures.grids import grid_decorators

### Grids ###


def grid_to_grid_radii(grid):
    return np.sqrt(np.add(np.square(grid[:, 0]), np.square(grid[:, 1])))


def ndarray_1d_from_grid(profile, grid):

    sersic_constant = (
        (2 * 2.0)
        - (1.0 / 3.0)
        + (4.0 / (405.0 * 2.0))
        + (46.0 / (25515.0 * 2.0 ** 2))
        + (131.0 / (1148175.0 * 2.0 ** 3))
        - (2194697.0 / (30690717750.0 * 2.0 ** 4))
    )

    grid_radii = grid_to_grid_radii(grid=grid)

    return np.exp(
        np.multiply(
            -sersic_constant,
            np.add(np.power(np.divide(grid_radii, 0.2), 1.0 / 2.0), -1),
        )
    )


def grid_angle_to_profile(grid_thetas):
    """The angle between each (y,x) coordinate on the grid and the profile, in radians.

    Parameters
    -----------
    grid_thetas : np.ndarray
        The angle theta counter-clockwise from the positive x-axis to each coordinate in radians.
    """
    return np.cos(grid_thetas), np.sin(grid_thetas)


def grid_to_grid_cartesian(grid, radius):
    """
    Convert a grid of (y,x) coordinates with their specified circular radii to their original (y,x) Cartesian
    coordinates.

    Parameters
    ----------
    grid
        The (y, x) coordinates in the reference frame of the profile.
    radius : np.ndarray
        The circular radius of each coordinate from the profile center.
    """
    grid_thetas = np.arctan2(grid[:, 0], grid[:, 1])
    cos_theta, sin_theta = grid_angle_to_profile(grid_thetas=grid_thetas)
    return np.multiply(radius[:, None], np.vstack((sin_theta, cos_theta)).T)


def ndarray_2d_from_grid(profile, grid):
    return grid_to_grid_cartesian(grid=grid, radius=np.full(grid.shape[0], 2.0))


class MockGridLikeIteratorObj:
    def __init__(self):
        pass

    @property
    def sersic_constant(self):
        return (
            (2 * 2.0)
            - (1.0 / 3.0)
            + (4.0 / (405.0 * 2.0))
            + (46.0 / (25515.0 * 2.0 ** 2))
            + (131.0 / (1148175.0 * 2.0 ** 3))
            - (2194697.0 / (30690717750.0 * 2.0 ** 4))
        )

    def grid_to_grid_radii(self, grid):
        return np.sqrt(np.add(np.square(grid[:, 0]), np.square(grid[:, 1])))

    def grid_angle_to_profile(self, grid_thetas):
        """The angle between each (y,x) coordinate on the grid and the profile, in radians.

        Parameters
        -----------
        grid_thetas : np.ndarray
            The angle theta counter-clockwise from the positive x-axis to each coordinate in radians.
        """
        return np.cos(grid_thetas), np.sin(grid_thetas)

    def grid_to_grid_cartesian(self, grid, radius):
        """
        Convert a grid of (y,x) coordinates with their specified circular radii to their original (y,x) Cartesian
        coordinates.

        Parameters
        ----------
        grid
            The (y, x) coordinates in the reference frame of the profile.
        radius : np.ndarray
            The circular radius of each coordinate from the profile center.
        """
        grid_thetas = np.arctan2(grid[:, 0], grid[:, 1])
        cos_theta, sin_theta = self.grid_angle_to_profile(grid_thetas=grid_thetas)
        return np.multiply(radius[:, None], np.vstack((sin_theta, cos_theta)).T)

    @grid_decorators.grid_2d_to_structure
    def ndarray_1d_from_grid(self, grid):
        grid_radii = self.grid_to_grid_radii(grid=grid)
        return np.exp(
            np.multiply(
                -self.sersic_constant,
                np.add(np.power(np.divide(grid_radii, 0.2), 1.0 / 2.0), -1),
            )
        )

    @grid_decorators.grid_2d_to_structure
    def ndarray_2d_from_grid(self, grid):
        return self.grid_to_grid_cartesian(
            grid=grid, radius=np.full(grid.shape[0], 2.0)
        )

    @grid_decorators.grid_2d_to_structure_list
    def ndarray_1d_list_from_grid(self, grid):
        grid_radii = self.grid_to_grid_radii(grid=grid)
        return [
            np.exp(
                np.multiply(
                    -self.sersic_constant,
                    np.add(np.power(np.divide(grid_radii, 0.2), 1.0 / 2.0), -1),
                )
            )
        ]

    @grid_decorators.grid_2d_to_structure_list
    def ndarray_2d_list_from_grid(self, grid):
        return [
            self.grid_to_grid_cartesian(grid=grid, radius=np.full(grid.shape[0], 2.0))
        ]


class MockGrid1DLikeObj:
    def __init__(self, centre=(0.0, 0.0), angle=0.0):

        self.centre = centre
        self.angle = angle

    @grid_decorators.grid_1d_to_structure
    def ndarray_1d_from_grid(self, grid):
        return np.ones(shape=grid.shape[0])

    # @grid_decorators.grid_1d_to_structure
    # def ndarray_2d_from_grid(self, grid):
    #     return np.multiply(2.0, grid)

    # @grid_decorators.grid_1d_to_structure_list
    # def ndarray_1d_list_from_grid(self, grid):
    #     return [np.ones(shape=grid.shape[0]), 2.0 * np.ones(shape=grid.shape[0])]
    #
    # @grid_decorators.grid_1d_to_structure_list
    # def ndarray_2d_list_from_grid(self, grid):
    #     return [np.multiply(1.0, grid), np.multiply(2.0, grid)]


class MockGrid2DLikeObj:
    def __init__(self):
        pass

    @grid_decorators.grid_2d_to_structure
    def ndarray_1d_from_grid(self, grid):
        return np.ones(shape=grid.shape[0])

    @grid_decorators.grid_2d_to_structure
    def ndarray_2d_from_grid(self, grid):
        return np.multiply(2.0, grid)

    @grid_decorators.grid_2d_to_structure_list
    def ndarray_1d_list_from_grid(self, grid):
        return [np.ones(shape=grid.shape[0]), 2.0 * np.ones(shape=grid.shape[0])]

    @grid_decorators.grid_2d_to_structure_list
    def ndarray_2d_list_from_grid(self, grid):
        return [np.multiply(1.0, grid), np.multiply(2.0, grid)]


class MockGridRadialMinimum:
    def __init__(self):
        pass

    def grid_to_grid_radii(self, grid):
        return np.sqrt(np.add(np.square(grid[:, 0]), np.square(grid[:, 1])))

    @grid_decorators.relocate_to_radial_minimum
    def deflections_2d_from_grid(self, grid):
        return grid


### Inversion ###


class MockFitInversion:
    def __init__(
        self,
        regularization_term,
        log_det_curvature_reg_matrix_term,
        log_det_regularization_matrix_term,
    ):

        self.regularization_term = regularization_term
        self.log_det_curvature_reg_matrix_term = log_det_curvature_reg_matrix_term
        self.log_det_regularization_matrix_term = log_det_regularization_matrix_term


class MockPixelization:
    def __init__(self, value, grid=None):
        self.value = value
        self.grid = grid

    # noinspection PyUnusedLocal,PyShadowingNames
    def mapper_from_grid_and_sparse_grid(
        self,
        grid,
        sparse_grid,
        sparse_image_plane_grid=None,
        hyper_image=None,
        settings=None,
    ):
        return self.value

    def sparse_grid_from_grid(self, grid, hyper_image, settings=None):
        if hyper_image is None:
            return self.grid
        else:
            return self.grid * hyper_image


class MockRegularization:
    def __init__(self, matrix_shape):
        self.shape = matrix_shape

    def regularization_matrix_from_pixel_neighbors(
        self, pixel_neighbors, pixel_neighbors_size
    ):
        return np.array([[1.0, 0.0, 0.0], [0.0, 1.0, 0.0], [0.0, 0.0, 1.0]])

    def regularization_matrix_from_mapper(self, mapper):
        return np.array([[1.0, 0.0, 0.0], [0.0, 1.0, 0.0], [0.0, 0.0, 1.0]])


class MockPixelizationGrid:
    def __init__(self, pixel_neighbors=None, pixel_neighbors_size=None):

        self.pixel_neighbors = pixel_neighbors
        self.pixel_neighbors_size = pixel_neighbors_size


class MockRegMapper:
    def __init__(self, source_pixelization_grid=None, pixel_signals=None):

        self.source_pixelization_grid = source_pixelization_grid
        self.pixel_signals = pixel_signals

    def pixel_signals_from_signal_scale(self, signal_scale):
        return self.pixel_signals


class MockMapper:
    def __init__(
        self, matrix_shape, source_grid_slim=None, source_pixelization_grid=None
    ):

        self.source_grid_slim = source_grid_slim
        self.source_pixelization_grid = source_pixelization_grid
        self.mapping_matrix = np.ones(matrix_shape)
        if source_pixelization_grid is not None:
            self.pixels = source_pixelization_grid.shape[0]
        else:
            self.pixels = None


class MockConvolver:
    def __init__(self, matrix_shape):
        self.shape = matrix_shape

    def convolve_mapping_matrix(self, mapping_matrix):
        return np.ones(self.shape)


class MockInversion:
    def __init__(self):
        self.blurred_mapping_matrix = np.zeros((1, 1))
        self.regularization_matrix = np.zeros((1, 1))
        self.curvature_matrix = np.zeros((1, 1))
        self.curvature_reg_matrix = np.zeros((1, 1))
        self.solution_vector = np.zeros((1))

    @property
    def reconstructed_image(self):
        return np.zeros((1, 1))
