import os
from io import BytesIO

import pytest

from PIL import Image, TiffImagePlugin
from PIL.TiffImagePlugin import RESOLUTION_UNIT, X_RESOLUTION, Y_RESOLUTION

from .helper import (
    assert_image_equal,
    assert_image_equal_tofile,
    assert_image_similar,
    assert_image_similar_tofile,
    hopper,
    is_pypy,
    is_win32,
)


class TestFileTiff:
    def test_sanity(self, tmp_path):

        filename = str(tmp_path / "temp.tif")

        hopper("RGB").save(filename)

        with Image.open(filename) as im:
            im.load()
        assert im.mode == "RGB"
        assert im.size == (128, 128)
        assert im.format == "TIFF"

        hopper("1").save(filename)
        with Image.open(filename):
            pass

        hopper("L").save(filename)
        with Image.open(filename):
            pass

        hopper("P").save(filename)
        with Image.open(filename):
            pass

        hopper("RGB").save(filename)
        with Image.open(filename):
            pass

        hopper("I").save(filename)
        with Image.open(filename):
            pass

    @pytest.mark.skipif(is_pypy(), reason="Requires CPython")
    def test_unclosed_file(self):
        def open():
            im = Image.open("Tests/images/multipage.tiff")
            im.load()

        pytest.warns(ResourceWarning, open)

    def test_closed_file(self):
        def open():
            im = Image.open("Tests/images/multipage.tiff")
            im.load()
            im.close()

        pytest.warns(None, open)

    def test_context_manager(self):
        def open():
            with Image.open("Tests/images/multipage.tiff") as im:
                im.load()

        pytest.warns(None, open)

    def test_mac_tiff(self):
        # Read RGBa images from macOS [@PIL136]

        filename = "Tests/images/pil136.tiff"
        with Image.open(filename) as im:
            assert im.mode == "RGBA"
            assert im.size == (55, 43)
            assert im.tile == [("raw", (0, 0, 55, 43), 8, ("RGBa", 0, 1))]
            im.load()

            assert_image_similar_tofile(im, "Tests/images/pil136.png", 1)

    def test_wrong_bits_per_sample(self):
        with Image.open("Tests/images/tiff_wrong_bits_per_sample.tiff") as im:
            assert im.mode == "RGBA"
            assert im.size == (52, 53)
            assert im.tile == [("raw", (0, 0, 52, 53), 160, ("RGBA", 0, 1))]
            im.load()

    def test_set_legacy_api(self):
        ifd = TiffImagePlugin.ImageFileDirectory_v2()
        with pytest.raises(Exception) as e:
            ifd.legacy_api = None
        assert str(e.value) == "Not allowing setting of legacy api"

    def test_xyres_tiff(self):
        filename = "Tests/images/pil168.tif"
        with Image.open(filename) as im:

            # legacy api
            assert isinstance(im.tag[X_RESOLUTION][0], tuple)
            assert isinstance(im.tag[Y_RESOLUTION][0], tuple)

            # v2 api
            assert isinstance(im.tag_v2[X_RESOLUTION], TiffImagePlugin.IFDRational)
            assert isinstance(im.tag_v2[Y_RESOLUTION], TiffImagePlugin.IFDRational)

            assert im.info["dpi"] == (72.0, 72.0)

    def test_xyres_fallback_tiff(self):
        filename = "Tests/images/compression.tif"
        with Image.open(filename) as im:

            # v2 api
            assert isinstance(im.tag_v2[X_RESOLUTION], TiffImagePlugin.IFDRational)
            assert isinstance(im.tag_v2[Y_RESOLUTION], TiffImagePlugin.IFDRational)
            with pytest.raises(KeyError):
                im.tag_v2[RESOLUTION_UNIT]

            # Legacy.
            assert im.info["resolution"] == (100.0, 100.0)
            # Fallback "inch".
            assert im.info["dpi"] == (100.0, 100.0)

    def test_int_resolution(self):
        filename = "Tests/images/pil168.tif"
        with Image.open(filename) as im:

            # Try to read a file where X,Y_RESOLUTION are ints
            im.tag_v2[X_RESOLUTION] = 71
            im.tag_v2[Y_RESOLUTION] = 71
            im._setup()
            assert im.info["dpi"] == (71.0, 71.0)

    def test_load_dpi_rounding(self):
        for resolutionUnit, dpi in ((None, (72, 73)), (2, (72, 73)), (3, (183, 185))):
            with Image.open(
                "Tests/images/hopper_roundDown_" + str(resolutionUnit) + ".tif"
            ) as im:
                assert im.tag_v2.get(RESOLUTION_UNIT) == resolutionUnit
                assert im.info["dpi"] == (dpi[0], dpi[0])

            with Image.open(
                "Tests/images/hopper_roundUp_" + str(resolutionUnit) + ".tif"
            ) as im:
                assert im.tag_v2.get(RESOLUTION_UNIT) == resolutionUnit
                assert im.info["dpi"] == (dpi[1], dpi[1])

    def test_save_dpi_rounding(self, tmp_path):
        outfile = str(tmp_path / "temp.tif")
        with Image.open("Tests/images/hopper.tif") as im:
            for dpi in (72.2, 72.8):
                im.save(outfile, dpi=(dpi, dpi))

                with Image.open(outfile) as reloaded:
                    reloaded.load()
                    assert (round(dpi), round(dpi)) == reloaded.info["dpi"]

    def test_save_setting_missing_resolution(self):
        b = BytesIO()
        Image.open("Tests/images/10ct_32bit_128.tiff").save(
            b, format="tiff", resolution=123.45
        )
        with Image.open(b) as im:
            assert float(im.tag_v2[X_RESOLUTION]) == 123.45
            assert float(im.tag_v2[Y_RESOLUTION]) == 123.45

    def test_invalid_file(self):
        invalid_file = "Tests/images/flower.jpg"

        with pytest.raises(SyntaxError):
            TiffImagePlugin.TiffImageFile(invalid_file)

        TiffImagePlugin.PREFIXES.append(b"\xff\xd8\xff\xe0")
        with pytest.raises(SyntaxError):
            TiffImagePlugin.TiffImageFile(invalid_file)
        TiffImagePlugin.PREFIXES.pop()

    def test_bad_exif(self):
        with Image.open("Tests/images/hopper_bad_exif.jpg") as i:
            # Should not raise struct.error.
            pytest.warns(UserWarning, i._getexif)

    def test_save_rgba(self, tmp_path):
        im = hopper("RGBA")
        outfile = str(tmp_path / "temp.tif")
        im.save(outfile)

    def test_save_unsupported_mode(self, tmp_path):
        im = hopper("HSV")
        outfile = str(tmp_path / "temp.tif")
        with pytest.raises(OSError):
            im.save(outfile)

    def test_little_endian(self):
        with Image.open("Tests/images/16bit.cropped.tif") as im:
            assert im.getpixel((0, 0)) == 480
            assert im.mode == "I;16"

            b = im.tobytes()
        # Bytes are in image native order (little endian)
        assert b[0] == ord(b"\xe0")
        assert b[1] == ord(b"\x01")

    def test_big_endian(self):
        with Image.open("Tests/images/16bit.MM.cropped.tif") as im:
            assert im.getpixel((0, 0)) == 480
            assert im.mode == "I;16B"

            b = im.tobytes()
        # Bytes are in image native order (big endian)
        assert b[0] == ord(b"\x01")
        assert b[1] == ord(b"\xe0")

    def test_16bit_s(self):
        with Image.open("Tests/images/16bit.s.tif") as im:
            im.load()
            assert im.mode == "I"
            assert im.getpixel((0, 0)) == 32767
            assert im.getpixel((0, 1)) == 0

    def test_12bit_rawmode(self):
        """Are we generating the same interpretation
        of the image as Imagemagick is?"""

        with Image.open("Tests/images/12bit.cropped.tif") as im:
            # to make the target --
            # convert 12bit.cropped.tif -depth 16 tmp.tif
            # convert tmp.tif -evaluate RightShift 4 12in16bit2.tif
            # imagemagick will auto scale so that a 12bit FFF is 16bit FFF0,
            # so we need to unshift so that the integer values are the same.

            assert_image_equal_tofile(im, "Tests/images/12in16bit.tif")

    def test_32bit_float(self):
        # Issue 614, specific 32-bit float format
        path = "Tests/images/10ct_32bit_128.tiff"
        with Image.open(path) as im:
            im.load()

            assert im.getpixel((0, 0)) == -0.4526388943195343
            assert im.getextrema() == (-3.140936851501465, 3.140684127807617)

    def test_unknown_pixel_mode(self):
        with pytest.raises(OSError):
            Image.open("Tests/images/hopper_unknown_pixel_mode.tif")

    def test_n_frames(self):
        for path, n_frames in [
            ["Tests/images/multipage-lastframe.tif", 1],
            ["Tests/images/multipage.tiff", 3],
        ]:
            with Image.open(path) as im:
                assert im.n_frames == n_frames
                assert im.is_animated == (n_frames != 1)

    def test_eoferror(self):
        with Image.open("Tests/images/multipage-lastframe.tif") as im:
            n_frames = im.n_frames

            # Test seeking past the last frame
            with pytest.raises(EOFError):
                im.seek(n_frames)
            assert im.tell() < n_frames

            # Test that seeking to the last frame does not raise an error
            im.seek(n_frames - 1)

    def test_multipage(self):
        # issue #862
        with Image.open("Tests/images/multipage.tiff") as im:
            # file is a multipage tiff: 10x10 green, 10x10 red, 20x20 blue

            im.seek(0)
            assert im.size == (10, 10)
            assert im.convert("RGB").getpixel((0, 0)) == (0, 128, 0)

            im.seek(1)
            im.load()
            assert im.size == (10, 10)
            assert im.convert("RGB").getpixel((0, 0)) == (255, 0, 0)

            im.seek(0)
            im.load()
            assert im.size == (10, 10)
            assert im.convert("RGB").getpixel((0, 0)) == (0, 128, 0)

            im.seek(2)
            im.load()
            assert im.size == (20, 20)
            assert im.convert("RGB").getpixel((0, 0)) == (0, 0, 255)

    def test_multipage_last_frame(self):
        with Image.open("Tests/images/multipage-lastframe.tif") as im:
            im.load()
            assert im.size == (20, 20)
            assert im.convert("RGB").getpixel((0, 0)) == (0, 0, 255)

    def test___str__(self):
        filename = "Tests/images/pil136.tiff"
        with Image.open(filename) as im:

            # Act
            ret = str(im.ifd)

            # Assert
            assert isinstance(ret, str)

    def test_dict(self):
        # Arrange
        filename = "Tests/images/pil136.tiff"
        with Image.open(filename) as im:

            # v2 interface
            v2_tags = {
                256: 55,
                257: 43,
                258: (8, 8, 8, 8),
                259: 1,
                262: 2,
                296: 2,
                273: (8,),
                338: (1,),
                277: 4,
                279: (9460,),
                282: 72.0,
                283: 72.0,
                284: 1,
            }
            assert dict(im.tag_v2) == v2_tags

            # legacy interface
            legacy_tags = {
                256: (55,),
                257: (43,),
                258: (8, 8, 8, 8),
                259: (1,),
                262: (2,),
                296: (2,),
                273: (8,),
                338: (1,),
                277: (4,),
                279: (9460,),
                282: ((720000, 10000),),
                283: ((720000, 10000),),
                284: (1,),
            }
            assert dict(im.tag) == legacy_tags

    def test__delitem__(self):
        filename = "Tests/images/pil136.tiff"
        with Image.open(filename) as im:
            len_before = len(dict(im.ifd))
            del im.ifd[256]
            len_after = len(dict(im.ifd))
            assert len_before == len_after + 1

    def test_load_byte(self):
        for legacy_api in [False, True]:
            ifd = TiffImagePlugin.ImageFileDirectory_v2()
            data = b"abc"
            ret = ifd.load_byte(data, legacy_api)
            assert ret == b"abc"

    def test_load_string(self):
        ifd = TiffImagePlugin.ImageFileDirectory_v2()
        data = b"abc\0"
        ret = ifd.load_string(data, False)
        assert ret == "abc"

    def test_load_float(self):
        ifd = TiffImagePlugin.ImageFileDirectory_v2()
        data = b"abcdabcd"
        ret = ifd.load_float(data, False)
        assert ret == (1.6777999408082104e22, 1.6777999408082104e22)

    def test_load_double(self):
        ifd = TiffImagePlugin.ImageFileDirectory_v2()
        data = b"abcdefghabcdefgh"
        ret = ifd.load_double(data, False)
        assert ret == (8.540883223036124e194, 8.540883223036124e194)

    def test_seek(self):
        filename = "Tests/images/pil136.tiff"
        with Image.open(filename) as im:
            im.seek(0)
            assert im.tell() == 0

    def test_seek_eof(self):
        filename = "Tests/images/pil136.tiff"
        with Image.open(filename) as im:
            assert im.tell() == 0
            with pytest.raises(EOFError):
                im.seek(-1)
            with pytest.raises(EOFError):
                im.seek(1)

    def test__limit_rational_int(self):
        from PIL.TiffImagePlugin import _limit_rational

        value = 34
        ret = _limit_rational(value, 65536)
        assert ret == (34, 1)

    def test__limit_rational_float(self):
        from PIL.TiffImagePlugin import _limit_rational

        value = 22.3
        ret = _limit_rational(value, 65536)
        assert ret == (223, 10)

    def test_4bit(self):
        test_file = "Tests/images/hopper_gray_4bpp.tif"
        original = hopper("L")
        with Image.open(test_file) as im:
            assert im.size == (128, 128)
            assert im.mode == "L"
            assert_image_similar(im, original, 7.3)

    def test_gray_semibyte_per_pixel(self):
        test_files = (
            (
                24.8,  # epsilon
                (  # group
                    "Tests/images/tiff_gray_2_4_bpp/hopper2.tif",
                    "Tests/images/tiff_gray_2_4_bpp/hopper2I.tif",
                    "Tests/images/tiff_gray_2_4_bpp/hopper2R.tif",
                    "Tests/images/tiff_gray_2_4_bpp/hopper2IR.tif",
                ),
            ),
            (
                7.3,  # epsilon
                (  # group
                    "Tests/images/tiff_gray_2_4_bpp/hopper4.tif",
                    "Tests/images/tiff_gray_2_4_bpp/hopper4I.tif",
                    "Tests/images/tiff_gray_2_4_bpp/hopper4R.tif",
                    "Tests/images/tiff_gray_2_4_bpp/hopper4IR.tif",
                ),
            ),
        )
        original = hopper("L")
        for epsilon, group in test_files:
            with Image.open(group[0]) as im:
                assert im.size == (128, 128)
                assert im.mode == "L"
                assert_image_similar(im, original, epsilon)
                for file in group[1:]:
                    with Image.open(file) as im2:
                        assert im2.size == (128, 128)
                        assert im2.mode == "L"
                        assert_image_equal(im, im2)

    def test_with_underscores(self, tmp_path):
        kwargs = {"resolution_unit": "inch", "x_resolution": 72, "y_resolution": 36}
        filename = str(tmp_path / "temp.tif")
        hopper("RGB").save(filename, **kwargs)
        with Image.open(filename) as im:

            # legacy interface
            assert im.tag[X_RESOLUTION][0][0] == 72
            assert im.tag[Y_RESOLUTION][0][0] == 36

            # v2 interface
            assert im.tag_v2[X_RESOLUTION] == 72
            assert im.tag_v2[Y_RESOLUTION] == 36

    def test_roundtrip_tiff_uint16(self, tmp_path):
        # Test an image of all '0' values
        pixel_value = 0x1234
        infile = "Tests/images/uint16_1_4660.tif"
        with Image.open(infile) as im:
            assert im.getpixel((0, 0)) == pixel_value

            tmpfile = str(tmp_path / "temp.tif")
            im.save(tmpfile)

            with Image.open(tmpfile) as reloaded:
                assert_image_equal(im, reloaded)

    def test_strip_raw(self):
        infile = "Tests/images/tiff_strip_raw.tif"
        with Image.open(infile) as im:
            assert_image_equal_tofile(im, "Tests/images/tiff_adobe_deflate.png")

    def test_strip_planar_raw(self):
        # gdal_translate -of GTiff -co INTERLEAVE=BAND \
        # tiff_strip_raw.tif tiff_strip_planar_raw.tiff
        infile = "Tests/images/tiff_strip_planar_raw.tif"
        with Image.open(infile) as im:
            assert_image_equal_tofile(im, "Tests/images/tiff_adobe_deflate.png")

    def test_strip_planar_raw_with_overviews(self):
        # gdaladdo tiff_strip_planar_raw2.tif 2 4 8 16
        infile = "Tests/images/tiff_strip_planar_raw_with_overviews.tif"
        with Image.open(infile) as im:
            assert_image_equal_tofile(im, "Tests/images/tiff_adobe_deflate.png")

    def test_tiled_planar_raw(self):
        # gdal_translate -of GTiff -co TILED=YES -co BLOCKXSIZE=32 \
        # -co BLOCKYSIZE=32 -co INTERLEAVE=BAND \
        # tiff_tiled_raw.tif tiff_tiled_planar_raw.tiff
        infile = "Tests/images/tiff_tiled_planar_raw.tif"
        with Image.open(infile) as im:
            assert_image_equal_tofile(im, "Tests/images/tiff_adobe_deflate.png")

    def test_palette(self, tmp_path):
        def roundtrip(mode):
            outfile = str(tmp_path / "temp.tif")

            im = hopper(mode)
            im.save(outfile)

            with Image.open(outfile) as reloaded:
                assert_image_equal(im.convert("RGB"), reloaded.convert("RGB"))

        for mode in ["P", "PA"]:
            roundtrip(mode)

    def test_tiff_save_all(self):
        mp = BytesIO()
        with Image.open("Tests/images/multipage.tiff") as im:
            im.save(mp, format="tiff", save_all=True)

        mp.seek(0, os.SEEK_SET)
        with Image.open(mp) as im:
            assert im.n_frames == 3

        # Test appending images
        mp = BytesIO()
        im = Image.new("RGB", (100, 100), "#f00")
        ims = [Image.new("RGB", (100, 100), color) for color in ["#0f0", "#00f"]]
        im.copy().save(mp, format="TIFF", save_all=True, append_images=ims)

        mp.seek(0, os.SEEK_SET)
        with Image.open(mp) as reread:
            assert reread.n_frames == 3

        # Test appending using a generator
        def imGenerator(ims):
            yield from ims

        mp = BytesIO()
        im.save(mp, format="TIFF", save_all=True, append_images=imGenerator(ims))

        mp.seek(0, os.SEEK_SET)
        with Image.open(mp) as reread:
            assert reread.n_frames == 3

    def test_saving_icc_profile(self, tmp_path):
        # Tests saving TIFF with icc_profile set.
        # At the time of writing this will only work for non-compressed tiffs
        # as libtiff does not support embedded ICC profiles,
        # ImageFile._save(..) however does.
        im = Image.new("RGB", (1, 1))
        im.info["icc_profile"] = "Dummy value"

        # Try save-load round trip to make sure both handle icc_profile.
        tmpfile = str(tmp_path / "temp.tif")
        im.save(tmpfile, "TIFF", compression="raw")
        with Image.open(tmpfile) as reloaded:
            assert b"Dummy value" == reloaded.info["icc_profile"]

    def test_close_on_load_exclusive(self, tmp_path):
        # similar to test_fd_leak, but runs on unixlike os
        tmpfile = str(tmp_path / "temp.tif")

        with Image.open("Tests/images/uint16_1_4660.tif") as im:
            im.save(tmpfile)

        im = Image.open(tmpfile)
        fp = im.fp
        assert not fp.closed
        im.load()
        assert fp.closed

    def test_close_on_load_nonexclusive(self, tmp_path):
        tmpfile = str(tmp_path / "temp.tif")

        with Image.open("Tests/images/uint16_1_4660.tif") as im:
            im.save(tmpfile)

        with open(tmpfile, "rb") as f:
            im = Image.open(f)
            fp = im.fp
            assert not fp.closed
            im.load()
            assert not fp.closed

    # Ignore this UserWarning which triggers for four tags:
    # "Possibly corrupt EXIF data.  Expecting to read 50404352 bytes but..."
    @pytest.mark.filterwarnings("ignore:Possibly corrupt EXIF data")
    def test_string_dimension(self):
        # Assert that an error is raised if one of the dimensions is a string
        with pytest.raises(ValueError):
            Image.open("Tests/images/string_dimension.tiff")


@pytest.mark.skipif(not is_win32(), reason="Windows only")
class TestFileTiffW32:
    def test_fd_leak(self, tmp_path):
        tmpfile = str(tmp_path / "temp.tif")

        # this is an mmaped file.
        with Image.open("Tests/images/uint16_1_4660.tif") as im:
            im.save(tmpfile)

        im = Image.open(tmpfile)
        fp = im.fp
        assert not fp.closed
        with pytest.raises(OSError):
            os.remove(tmpfile)
        im.load()
        assert fp.closed

        # this closes the mmap
        im.close()

        # this should not fail, as load should have closed the file pointer,
        # and close should have closed the mmap
        os.remove(tmpfile)