# coding: utf-8
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"""This module provides 2D data and RGB(A) image item class.
"""

from __future__ import absolute_import

__authors__ = ["T. Vincent"]
__license__ = "MIT"
__date__ = "15/11/2017"

import numpy

from ..scene import primitives, utils
from .core import DataItem3D, ItemChangedType
from .mixins import ColormapMixIn, InterpolationMixIn
from ._pick import PickingResult


class _Image(DataItem3D, InterpolationMixIn):
    """Base class for images

    :param parent: The View widget this item belongs to.
    """

    def __init__(self, parent=None):
        DataItem3D.__init__(self, parent=parent)
        InterpolationMixIn.__init__(self)

    def _setPrimitive(self, primitive):
        InterpolationMixIn._setPrimitive(self, primitive)

    def getData(self, copy=True):
        raise NotImplementedError()

    def _pickFull(self, context):
        """Perform picking in this item at given widget position.

        :param PickContext context: Current picking context
        :return: Object holding the results or None
        :rtype: Union[None,PickingResult]
        """
        rayObject = context.getPickingSegment(frame=self._getScenePrimitive())
        if rayObject is None:
            return None

        points = utils.segmentPlaneIntersect(
            rayObject[0, :3],
            rayObject[1, :3],
            planeNorm=numpy.array((0., 0., 1.), dtype=numpy.float64),
            planePt=numpy.array((0., 0., 0.), dtype=numpy.float64))

        if len(points) == 1:  # Single intersection
            if points[0][0] < 0. or points[0][1] < 0.:
                return None  # Outside image
            row, column = int(points[0][1]), int(points[0][0])
            data = self.getData(copy=False)
            height, width = data.shape[:2]
            if row < height and column < width:
                return PickingResult(
                    self,
                    positions=[(points[0][0], points[0][1], 0.)],
                    indices=([row], [column]))
            else:
                return None  # Outside image
        else:  # Either no intersection or segment and image are coplanar
            return None


class ImageData(_Image, ColormapMixIn):
    """Description of a 2D image data.

    :param parent: The View widget this item belongs to.
    """

    def __init__(self, parent=None):
        _Image.__init__(self, parent=parent)
        ColormapMixIn.__init__(self)

        self._data = numpy.zeros((0, 0), dtype=numpy.float32)

        self._image = primitives.ImageData(self._data)
        self._getScenePrimitive().children.append(self._image)

        # Connect scene primitive to mix-in class
        ColormapMixIn._setSceneColormap(self, self._image.colormap)
        _Image._setPrimitive(self, self._image)

    def setData(self, data, copy=True):
        """Set the image data to display.

        The data will be casted to float32.

        :param numpy.ndarray data: The image data
        :param bool copy: True (default) to copy the data,
                          False to use as is (do not modify!).
        """
        self._image.setData(data, copy=copy)
        ColormapMixIn._setRangeFromData(self, self.getData(copy=False))
        self._updated(ItemChangedType.DATA)

    def getData(self, copy=True):
        """Get the image data.

        :param bool copy:
            True (default) to get a copy,
            False to get internal representation (do not modify!).
        :rtype: numpy.ndarray
        :return: The image data
        """
        return self._image.getData(copy=copy)


class ImageRgba(_Image, InterpolationMixIn):
    """Description of a 2D data RGB(A) image.

    :param parent: The View widget this item belongs to.
    """

    def __init__(self, parent=None):
        _Image.__init__(self, parent=parent)
        InterpolationMixIn.__init__(self)

        self._data = numpy.zeros((0, 0, 3), dtype=numpy.float32)

        self._image = primitives.ImageRgba(self._data)
        self._getScenePrimitive().children.append(self._image)

        # Connect scene primitive to mix-in class
        _Image._setPrimitive(self, self._image)

    def setData(self, data, copy=True):
        """Set the RGB(A) image data to display.

        Supported array format: float32 in [0, 1], uint8.

        :param numpy.ndarray data:
            The RGBA image data as an array of shape (H, W, Channels)
        :param bool copy: True (default) to copy the data,
                          False to use as is (do not modify!).
        """
        self._image.setData(data, copy=copy)
        self._updated(ItemChangedType.DATA)

    def getData(self, copy=True):
        """Get the image data.

        :param bool copy:
            True (default) to get a copy,
            False to get internal representation (do not modify!).
        :rtype: numpy.ndarray
        :return: The image data
        """
        return self._image.getData(copy=copy)