import os
from glob import glob
from itertools import product

import pytest
from PIL import Image

from .helper import PillowTestCase, assert_image_equal, hopper

_TGA_DIR = os.path.join("Tests", "images", "tga")
_TGA_DIR_COMMON = os.path.join(_TGA_DIR, "common")


class TestFileTga(PillowTestCase):

    _MODES = ("L", "LA", "P", "RGB", "RGBA")
    _ORIGINS = ("tl", "bl")

    _ORIGIN_TO_ORIENTATION = {"tl": 1, "bl": -1}

    def test_sanity(self):
        for mode in self._MODES:
            png_paths = glob(
                os.path.join(_TGA_DIR_COMMON, "*x*_{}.png".format(mode.lower()))
            )

            for png_path in png_paths:
                with Image.open(png_path) as reference_im:
                    assert reference_im.mode == mode

                    path_no_ext = os.path.splitext(png_path)[0]
                    for origin, rle in product(self._ORIGINS, (True, False)):
                        tga_path = "{}_{}_{}.tga".format(
                            path_no_ext, origin, "rle" if rle else "raw"
                        )

                        with Image.open(tga_path) as original_im:
                            assert original_im.format == "TGA"
                            assert original_im.get_format_mimetype() == "image/x-tga"
                            if rle:
                                assert original_im.info["compression"] == "tga_rle"
                            assert (
                                original_im.info["orientation"]
                                == self._ORIGIN_TO_ORIENTATION[origin]
                            )
                            if mode == "P":
                                assert (
                                    original_im.getpalette()
                                    == reference_im.getpalette()
                                )

                            assert_image_equal(original_im, reference_im)

                            # Generate a new test name every time so the
                            # test will not fail with permission error
                            # on Windows.
                            out = self.tempfile("temp.tga")

                            original_im.save(out, rle=rle)
                            with Image.open(out) as saved_im:
                                if rle:
                                    assert (
                                        saved_im.info["compression"]
                                        == original_im.info["compression"]
                                    )
                                assert (
                                    saved_im.info["orientation"]
                                    == original_im.info["orientation"]
                                )
                                if mode == "P":
                                    assert (
                                        saved_im.getpalette()
                                        == original_im.getpalette()
                                    )

                                assert_image_equal(saved_im, original_im)

    def test_id_field(self):
        # tga file with id field
        test_file = "Tests/images/tga_id_field.tga"

        # Act
        with Image.open(test_file) as im:

            # Assert
            assert im.size == (100, 100)

    def test_id_field_rle(self):
        # tga file with id field
        test_file = "Tests/images/rgb32rle.tga"

        # Act
        with Image.open(test_file) as im:

            # Assert
            assert im.size == (199, 199)

    def test_save(self):
        test_file = "Tests/images/tga_id_field.tga"
        with Image.open(test_file) as im:
            out = self.tempfile("temp.tga")

            # Save
            im.save(out)
            with Image.open(out) as test_im:
                assert test_im.size == (100, 100)
                assert test_im.info["id_section"] == im.info["id_section"]

            # RGBA save
            im.convert("RGBA").save(out)
        with Image.open(out) as test_im:
            assert test_im.size == (100, 100)

    def test_save_wrong_mode(self):
        im = hopper("PA")
        out = self.tempfile("temp.tga")

        with pytest.raises(OSError):
            im.save(out)

    def test_save_id_section(self):
        test_file = "Tests/images/rgb32rle.tga"
        with Image.open(test_file) as im:
            out = self.tempfile("temp.tga")

            # Check there is no id section
            im.save(out)
        with Image.open(out) as test_im:
            assert "id_section" not in test_im.info

        # Save with custom id section
        im.save(out, id_section=b"Test content")
        with Image.open(out) as test_im:
            assert test_im.info["id_section"] == b"Test content"

        # Save with custom id section greater than 255 characters
        id_section = b"Test content" * 25
        pytest.warns(UserWarning, lambda: im.save(out, id_section=id_section))
        with Image.open(out) as test_im:
            assert test_im.info["id_section"] == id_section[:255]

        test_file = "Tests/images/tga_id_field.tga"
        with Image.open(test_file) as im:

            # Save with no id section
            im.save(out, id_section="")
        with Image.open(out) as test_im:
            assert "id_section" not in test_im.info

    def test_save_orientation(self):
        test_file = "Tests/images/rgb32rle.tga"
        out = self.tempfile("temp.tga")
        with Image.open(test_file) as im:
            assert im.info["orientation"] == -1

            im.save(out, orientation=1)
        with Image.open(out) as test_im:
            assert test_im.info["orientation"] == 1

    def test_save_rle(self):
        test_file = "Tests/images/rgb32rle.tga"
        with Image.open(test_file) as im:
            assert im.info["compression"] == "tga_rle"

            out = self.tempfile("temp.tga")

            # Save
            im.save(out)
        with Image.open(out) as test_im:
            assert test_im.size == (199, 199)
            assert test_im.info["compression"] == "tga_rle"

        # Save without compression
        im.save(out, compression=None)
        with Image.open(out) as test_im:
            assert "compression" not in test_im.info

        # RGBA save
        im.convert("RGBA").save(out)
        with Image.open(out) as test_im:
            assert test_im.size == (199, 199)

        test_file = "Tests/images/tga_id_field.tga"
        with Image.open(test_file) as im:
            assert "compression" not in im.info

            # Save with compression
            im.save(out, compression="tga_rle")
        with Image.open(out) as test_im:
            assert test_im.info["compression"] == "tga_rle"

    def test_save_l_transparency(self):
        # There are 559 transparent pixels in la.tga.
        num_transparent = 559

        in_file = "Tests/images/la.tga"
        with Image.open(in_file) as im:
            assert im.mode == "LA"
            assert im.getchannel("A").getcolors()[0][0] == num_transparent

            out = self.tempfile("temp.tga")
            im.save(out)

        with Image.open(out) as test_im:
            assert test_im.mode == "LA"
            assert test_im.getchannel("A").getcolors()[0][0] == num_transparent

            assert_image_equal(im, test_im)