# Created: 07.03.2016
# Copyright (c) 2016-2018, Manfred Moitzi
# License: MIT License
from typing import Iterable, Tuple, Sequence, List, TYPE_CHECKING, cast
from ezdxf.dxfentity import DXFEntity
from ezdxf.lldxf.attributes import DXFAttr, DXFAttributes, DefSubclass, XType
from ezdxf.lldxf.types import DXFVertex
from ezdxf.lldxf.tags import Tags
from ezdxf.lldxf.extendedtags import ExtendedTags
from ezdxf.math import Vector

from .graphics import none_subclass, entity_subclass, ModernGraphicEntity


if TYPE_CHECKING:
    from ezdxf.eztypes import Vertex


_IMAGE_CLS = """0
CLASS
1
IMAGE
2
AcDbRasterImage
3
ISM
90
2175
91
0
280
0
281
1
"""
_IMAGE_TPL = """0
IMAGE
5
0
330
0
100
AcDbEntity
8
0
100
AcDbRasterImage
90
0
10
0.0
20
0.0
30
0.0
11
0.0
21
0.0
31
0.0
12
0.0
22
0.0
32
0.0
13
640
23
320
340
0
70
3
280
0
281
50
282
50
283
0
360
0
71
1
91
2
"""

image_subclass = DefSubclass('AcDbRasterImage', {
    'insert': DXFAttr(10, xtype=XType.point3d),
    'u_pixel': DXFAttr(11, xtype=XType.point3d),  # U-vector of a single pixel (points along the visual bottom of the image, starting at the insertion point)
    'v_pixel': DXFAttr(12, xtype=XType.point3d),  # V2-vector of a single pixel (points along the visual left side of the image, starting at the insertion point)
    'image_size': DXFAttr(13, xtype=XType.point2d),  # Image size in pixels
    'image_def': DXFAttr(340),  # Hard reference to image def object
    'flags': DXFAttr(70, default=3),  # Image display properties:
    # 1 = Show image
    # 2 = Show image when not aligned with screen
    # 4 = Use clipping boundary
    # 8 = Transparency is on
    'clipping': DXFAttr(280, default=0),  # Clipping state: 0 = Off; 1 = On
    'brightness': DXFAttr(281, default=50),  # Brightness value (0-100; default = 50)
    'contrast': DXFAttr(282, default=50),  # Contrast value (0-100; default = 50)
    'fade': DXFAttr(283, default=0),  # Fade value (0-100; default = 0)
    'image_def_reactor': DXFAttr(360),  # Hard reference to image def reactor object, not required by AutoCAD
    'clipping_boundary_type': DXFAttr(71, default=1),  # Clipping boundary type. 1 = Rectangular; 2 = Polygonal
    'count_boundary_points': DXFAttr(91),  # Number of clip boundary vertices that follow
    'clip_mode': DXFAttr(290, dxfversion='AC1024'),  # 0 = outside, 1 = inside mode
    # boundary path coordinates are pixel coordinates NOT drawing units
})


class Image(ModernGraphicEntity):
    __slots__ = ()
    TEMPLATE = ExtendedTags.from_text(_IMAGE_TPL)
    CLASS = ExtendedTags.from_text(_IMAGE_CLS)
    DXFATTRIBS = DXFAttributes(none_subclass, entity_subclass, image_subclass)
    # flags for IMAGE
    SHOW_IMAGE = 1
    SHOW_IMAGE_WHEN_NOT_ALIGNED = 2
    USE_CLIPPING_BOUNDARY = 4
    USE_TRANSPARENCY = 8

    def post_new_hook(self) -> None:
        self.reset_boundary_path()

    def set_boundary_path(self, vertices: Iterable[Tuple[float, float]]) -> None:
        vertices = list(vertices)
        if len(vertices) > 2 and vertices[-1] != vertices[0]:
            vertices.append(vertices[0])  # close path, else AutoCAD crashes
        self._set_path_tags(vertices)
        self.set_flag_state(self.USE_CLIPPING_BOUNDARY, state=True)
        self.dxf.clipping = 1
        self.dxf.clipping_boundary_type = 1 if len(vertices) < 3 else 2

    def _set_path_tags(self, vertices: Sequence[Tuple[float, float]]):
        boundary = [DXFVertex(14, value) for value in vertices]
        subclasstags = Tags(tag for tag in self.tags.subclasses[2] if tag.code != 14)
        subclasstags.extend(boundary)
        self.tags.subclasses[2] = subclasstags
        self.dxf.count_boundary_points = len(vertices)

    def reset_boundary_path(self) -> None:
        lower_left_corner = (-.5, -.5)
        upper_right_corner = Vector(self.dxf.image_size) + lower_left_corner
        self._set_path_tags([lower_left_corner, upper_right_corner[:2]])
        self.set_flag_state(Image.USE_CLIPPING_BOUNDARY, state=False)
        self.dxf.clipping = 0
        self.dxf.clipping_boundary_type = 1

    def get_boundary_path(self) -> List['Vertex']:
        image_subclass = self.tags.subclasses[2]
        return [tag.value for tag in image_subclass if tag.code == 14]

    def get_image_def(self) -> 'ImageDef':
        return cast('ImageDef', self.dxffactory.wrap_handle(self.dxf.image_def))

    def destroy(self) -> None:
        super(Image, self).destroy()
        # remove rectors
        image_def = self.get_image_def()
        reactor_handle = self.get_dxf_attrib('image_def_reactor', None)
        if reactor_handle is None:
            return
        image_def.remove_reactor_handle(reactor_handle)
        if self.drawing is not None:
            reactor = self.dxffactory.wrap_handle(reactor_handle)
            self.drawing.objects.delete_entity(reactor)


_IMAGE_DEF_CLS = """0
CLASS
1
IMAGEDEF
2
AcDbRasterImageDef
3
ISM
90
0
91
0
280
0
281
0
"""

_IMAGE_DEF_TPL = """0
IMAGEDEF
  5
0
330
0
102
{ACAD_REACTORS
102
}
100
AcDbRasterImageDef
 90
  0
  1
path/filename.jpg
 10
640
 20
480
 11
0.01
 21
0.01
280
  1
281
  0
"""

image_def_subclass = DefSubclass('AcDbRasterImageDef', {
    'class_version': DXFAttr(90),  # class version
    'filename': DXFAttr(1),  # File name of image
    'image_size': DXFAttr(10, xtype=XType.point2d),  # image size in pixels
    'pixel_size': DXFAttr(11, xtype=XType.point2d),  # Default size of one pixel in AutoCAD units
    'loaded': DXFAttr(280, default=1),
    'resolution_units': DXFAttr(281, default=0),  # Resolution units. 0 = No units; 2 = Centimeters; 5 = Inch
})


# IMAGEDEF - requires entry in objects table ACAD_IMAGE_DICT, ACAD_IMAGE_DICT exists not by default
class ImageDef(DXFEntity):
    TEMPLATE = ExtendedTags.from_text(_IMAGE_DEF_TPL)
    CLASS = ExtendedTags.from_text(_IMAGE_DEF_CLS)
    DXFATTRIBS = DXFAttributes(none_subclass, image_def_subclass)


_IMAGE_DEF_REACTOR_CLS = """0
CLASS
1
IMAGEDEF_REACTOR
2
AcDbRasterImageDefReactor
3
ISM
90
1
91
0
280
0
281
0
"""
_IMAGE_DEF_REACTOR_TPL = """0
IMAGEDEF_REACTOR
5
0
330
0
100
AcDbRasterImageDefReactor
90
2
330
0
"""


# IMAGEDEF_REACTOR is not required by AutoCAD
# owner -> IMAGE
class ImageDefReactor(DXFEntity):
    TEMPLATE = ExtendedTags.from_text(_IMAGE_DEF_REACTOR_TPL)
    CLASS = ExtendedTags.from_text(_IMAGE_DEF_REACTOR_CLS)
    DXFATTRIBS = DXFAttributes(none_subclass, DefSubclass('AcDbRasterImageDef', {
        'image': DXFAttr(330),  # handle to image
    }))


_RASTER_VARIABLES_CLS = """0
CLASS
1
RASTERVARIABLES
2
AcDbRasterVariables
3
ISM
90
0
91
0
280
0
281
0
"""

_RASTER_VARIABLES_TPL = """0
RASTERVARIABLES
5
0
102
{ACAD_REACTORS
330
0
102
}
330
0
100
AcDbRasterVariables
90
0
70
0
71
1
72
3
"""


class RasterVariables(DXFEntity):
    TEMPLATE = ExtendedTags.from_text(_RASTER_VARIABLES_TPL)
    CLASS = ExtendedTags.from_text(_RASTER_VARIABLES_CLS)
    DXFATTRIBS = DXFAttributes(
        none_subclass,
        DefSubclass('AcDbRasterVariables', {
            'version': DXFAttr(90, default=0),
            'frame': DXFAttr(70, default=0),  # 0 = no frame; 1= show frame
            'quality': DXFAttr(71, default=1),  # 0=draft; 1=high
            'units': DXFAttr(72, default=3),  # 0 = None; 1 = mm; 2 = cm 3 = m; 4 = km; 5 = in 6 = ft; 7 = yd; 8 = mi
        }),
    )