# This file is part of the MapProxy project.
# Copyright (C) 2012 Omniscale <http://omniscale.de>
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#    http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

from mapproxy.compat.image import Image, ImageDraw
from mapproxy.image import ImageSource
from mapproxy.image.mask import mask_image_source_from_coverage
from mapproxy.image.merge import LayerMerger
from mapproxy.image.opts import ImageOptions
from mapproxy.srs import SRS
from mapproxy.test.image import assert_img_colors_eq, create_image
from mapproxy.util.coverage import load_limited_to

import pytest

try:
    from shapely.geometry import Polygon

    geom_support = True
except ImportError:
    geom_support = False

pytestmark = pytest.mark.skipif(not geom_support, reason="requires shapely")


def coverage(geom, srs="EPSG:4326"):
    return load_limited_to({"srs": srs, "geometry": geom})


class TestMaskImage(object):

    def test_mask_outside_of_image_transparent(self):
        img = ImageSource(
            Image.new("RGB", (100, 100), color=(100, 0, 200)),
            image_opts=ImageOptions(transparent=True),
        )
        result = mask_image_source_from_coverage(
            img, [0, 0, 10, 10], SRS(4326), coverage([20, 20, 30, 30])
        )
        assert_img_colors_eq(
            result.as_image().getcolors(), [((100 * 100), (255, 255, 255, 0))]
        )

    def test_mask_outside_of_image_bgcolor(self):
        img = ImageSource(
            Image.new("RGB", (100, 100), color=(100, 0, 200)),
            image_opts=ImageOptions(bgcolor=(200, 30, 120)),
        )

        result = mask_image_source_from_coverage(
            img, [0, 0, 10, 10], SRS(4326), coverage([20, 20, 30, 30])
        )
        assert_img_colors_eq(
            result.as_image().getcolors(), [((100 * 100), (200, 30, 120))]
        )

    def test_mask_partial_image_bgcolor(self):
        img = ImageSource(
            Image.new("RGB", (100, 100), color=(100, 0, 200)),
            image_opts=ImageOptions(bgcolor=(200, 30, 120)),
        )

        result = mask_image_source_from_coverage(
            img, [0, 0, 10, 10], SRS(4326), coverage([5, 5, 30, 30])
        )
        assert_img_colors_eq(
            result.as_image().getcolors(),
            [(7500, (200, 30, 120)), (2500, (100, 0, 200))],
        )

    def test_mask_partial_image_transparent(self):
        img = ImageSource(
            Image.new("RGB", (100, 100), color=(100, 0, 200)),
            image_opts=ImageOptions(transparent=True),
        )

        result = mask_image_source_from_coverage(
            img, [0, 0, 10, 10], SRS(4326), coverage([5, 5, 30, 30])
        )
        assert_img_colors_eq(
            result.as_image().getcolors(),
            [(7500, (255, 255, 255, 0)), (2500, (100, 0, 200, 255))],
        )

    def test_wkt_mask_partial_image_transparent(self):
        img = ImageSource(
            Image.new("RGB", (100, 100), color=(100, 0, 200)),
            image_opts=ImageOptions(transparent=True),
        )

        # polygon with hole
        geom = "POLYGON((2 2, 2 8, 8 8, 8 2, 2 2), (4 4, 4 6, 6 6, 6 4, 4 4))"

        result = mask_image_source_from_coverage(
            img, [0, 0, 10, 10], SRS(4326), coverage(geom)
        )
        # 60*60 - 20*20 = 3200
        assert_img_colors_eq(
            result.as_image().getcolors(),
            [(10000 - 3200, (255, 255, 255, 0)), (3200, (100, 0, 200, 255))],
        )

    def test_shapely_mask_with_transform_partial_image_transparent(self):
        img = ImageSource(
            Image.new("RGB", (100, 100), color=(100, 0, 200)),
            image_opts=ImageOptions(transparent=True),
        )

        p = Polygon(
            [(0, 0), (222000, 0), (222000, 222000), (0, 222000)]
        )  # ~ 2x2 degres

        result = mask_image_source_from_coverage(
            img, [0, 0, 10, 10], SRS(4326), coverage(p, "EPSG:3857")
        )
        # 20*20 = 400
        assert_img_colors_eq(
            result.as_image().getcolors(),
            [(10000 - 400, (255, 255, 255, 0)), (400, (100, 0, 200, 255))],
        )


class TestLayerCoverageMerge(object):

    def setup_method(self):
        self.coverage1 = coverage(
            Polygon([(0, 0), (0, 10), (10, 10), (10, 0)]), 3857
        )
        self.coverage2 = coverage([2, 2, 8, 8], 3857)

    def test_merge_single_coverage(self):
        merger = LayerMerger()
        merger.add(
            ImageSource(Image.new("RGB", (10, 10), (255, 255, 255))),
            self.coverage1,
        )
        result = merger.merge(
            image_opts=ImageOptions(transparent=True),
            bbox=(5, 0, 15, 10),
            bbox_srs=3857,
        )
        img = result.as_image()
        assert img.mode == "RGBA"
        assert img.getpixel((4, 0)) == (255, 255, 255, 255)
        assert img.getpixel((6, 0)) == (255, 255, 255, 0)

    def test_merge_overlapping_coverage(self):
        color1 = (255, 255, 0)
        color2 = (0, 255, 255)
        merger = LayerMerger()
        merger.add(
            ImageSource(Image.new("RGB", (10, 10), color1)), self.coverage1
        )
        merger.add(
            ImageSource(Image.new("RGB", (10, 10), color2)), self.coverage2
        )

        result = merger.merge(
            image_opts=ImageOptions(), bbox=(0, 0, 10, 10), bbox_srs=3857
        )
        img = result.as_image()
        assert img.mode == "RGB"

        expected = create_image((10, 10), color1, "RGB")
        draw = ImageDraw.Draw(expected)
        draw.polygon([(2, 2), (7, 2), (7, 7), (2, 7)], fill=color2)

        for x in range(0, 9):
            for y in range(0, 9):
                assert img.getpixel((x, y)) == expected.getpixel((x, y))
