import os
import pathlib
import shutil
import tempfile
from copy import deepcopy
from unittest.mock import MagicMock, patch

import ffmpy
import matplotlib.pyplot as plt
import numpy as np
import pytest
from PIL import Image

from gradio import media_data, processing_utils

os.environ["GRADIO_ANALYTICS_ENABLED"] = "False"


class TestImagePreprocessing:
    def test_decode_base64_to_image(self):
        output_image = processing_utils.decode_base64_to_image(
            deepcopy(media_data.BASE64_IMAGE)
        )
        assert isinstance(output_image, Image.Image)

    def test_encode_url_or_file_to_base64(self):
        output_base64 = processing_utils.encode_url_or_file_to_base64(
            "gradio/test_data/test_image.png"
        )
        assert output_base64 == deepcopy(media_data.BASE64_IMAGE)

    def test_encode_file_to_base64(self):
        output_base64 = processing_utils.encode_file_to_base64(
            "gradio/test_data/test_image.png"
        )
        assert output_base64 == deepcopy(media_data.BASE64_IMAGE)

    @pytest.mark.flaky
    def test_encode_url_to_base64(self):
        output_base64 = processing_utils.encode_url_to_base64(
            "https://raw.githubusercontent.com/gradio-app/gradio/main/gradio/test_data/test_image.png"
        )
        assert output_base64 == deepcopy(media_data.BASE64_IMAGE)

    def test_encode_plot_to_base64(self):
        plt.plot([1, 2, 3, 4])
        output_base64 = processing_utils.encode_plot_to_base64(plt)
        assert output_base64.startswith(
            "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAo"
        )

    def test_encode_array_to_base64(self):
        img = Image.open("gradio/test_data/test_image.png")
        img = img.convert("RGB")
        numpy_data = np.asarray(img, dtype=np.uint8)
        output_base64 = processing_utils.encode_array_to_base64(numpy_data)
        assert output_base64 == deepcopy(media_data.ARRAY_TO_BASE64_IMAGE)

    def test_encode_pil_to_base64(self):
        img = Image.open("gradio/test_data/test_image.png")
        img = img.convert("RGB")
        img.info = {}  # Strip metadata
        output_base64 = processing_utils.encode_pil_to_base64(img)
        assert output_base64 == deepcopy(media_data.ARRAY_TO_BASE64_IMAGE)

    def test_encode_pil_to_base64_keeps_pnginfo(self):
        input_img = Image.open("gradio/test_data/test_image.png")
        input_img = input_img.convert("RGB")
        input_img.info = {"key1": "value1", "key2": "value2"}

        encoded_image = processing_utils.encode_pil_to_base64(input_img)
        decoded_image = processing_utils.decode_base64_to_image(encoded_image)

        assert decoded_image.info == input_img.info

    def test_resize_and_crop(self):
        img = Image.open("gradio/test_data/test_image.png")
        new_img = processing_utils.resize_and_crop(img, (20, 20))
        assert new_img.size == (20, 20)
        with pytest.raises(ValueError):
            processing_utils.resize_and_crop(
                **{"img": img, "size": (20, 20), "crop_type": "test"}
            )


class TestAudioPreprocessing:
    def test_audio_from_file(self):
        audio = processing_utils.audio_from_file("gradio/test_data/test_audio.wav")
        assert audio[0] == 22050
        assert isinstance(audio[1], np.ndarray)

    def test_audio_to_file(self):
        audio = processing_utils.audio_from_file("gradio/test_data/test_audio.wav")
        processing_utils.audio_to_file(audio[0], audio[1], "test_audio_to_file")
        assert os.path.exists("test_audio_to_file")
        os.remove("test_audio_to_file")

    def test_convert_to_16_bit_wav(self):
        # Generate a random audio sample and set the amplitude
        audio = np.random.randint(-100, 100, size=(100), dtype="int16")
        audio[0] = -32767
        audio[1] = 32766

        audio_ = audio.astype("float64")
        audio_ = processing_utils.convert_to_16_bit_wav(audio_)
        assert np.allclose(audio, audio_)
        assert audio_.dtype == "int16"

        audio_ = audio.astype("float32")
        audio_ = processing_utils.convert_to_16_bit_wav(audio_)
        assert np.allclose(audio, audio_)
        assert audio_.dtype == "int16"

        audio_ = processing_utils.convert_to_16_bit_wav(audio)
        assert np.allclose(audio, audio_)
        assert audio_.dtype == "int16"


class TestTempFileManager:
    def test_get_temp_file_path(self):
        temp_file_manager = processing_utils.TempFileManager()
        temp_file_manager.hash_file = MagicMock(return_value="")

        filepath = "C:/gradio/test_image.png"
        temp_filepath = temp_file_manager.get_temp_file_path(filepath)
        assert "test_image" in temp_filepath
        assert temp_filepath.endswith(".png")

        filepath = "ABCabc123.csv"
        temp_filepath = temp_file_manager.get_temp_file_path(filepath)
        assert "ABCabc123" in temp_filepath
        assert temp_filepath.endswith(".csv")

        filepath = "lion#1.jpeg"
        temp_filepath = temp_file_manager.get_temp_file_path(filepath)
        assert "lion1" in temp_filepath
        assert temp_filepath.endswith(".jpeg")

        filepath = "%%lio|n#1.jpeg"
        temp_filepath = temp_file_manager.get_temp_file_path(filepath)
        assert "lion1" in temp_filepath
        assert temp_filepath.endswith(".jpeg")

        filepath = "/home/lion--_1.txt"
        temp_filepath = temp_file_manager.get_temp_file_path(filepath)
        assert "lion--_1" in temp_filepath
        assert temp_filepath.endswith(".txt")

    def test_hash_file(self):
        temp_file_manager = processing_utils.TempFileManager()
        h1 = temp_file_manager.hash_file("gradio/test_data/cheetah1.jpg")
        h2 = temp_file_manager.hash_file("gradio/test_data/cheetah1-copy.jpg")
        h3 = temp_file_manager.hash_file("gradio/test_data/cheetah2.jpg")
        assert h1 == h2
        assert h1 != h3

    @patch("shutil.copy2")
    def test_make_temp_copy_if_needed(self, mock_copy):
        temp_file_manager = processing_utils.TempFileManager()

        f = temp_file_manager.make_temp_copy_if_needed("gradio/test_data/cheetah1.jpg")
        try:  # Delete if already exists from before this test
            os.remove(f)
        except OSError:
            pass

        f = temp_file_manager.make_temp_copy_if_needed("gradio/test_data/cheetah1.jpg")
        assert mock_copy.called
        assert len(temp_file_manager.temp_files) == 1

        f = temp_file_manager.make_temp_copy_if_needed("gradio/test_data/cheetah1.jpg")
        assert len(temp_file_manager.temp_files) == 1

        f = temp_file_manager.make_temp_copy_if_needed(
            "gradio/test_data/cheetah1-copy.jpg"
        )
        assert len(temp_file_manager.temp_files) == 2

    @pytest.mark.flaky
    @patch("shutil.copyfileobj")
    def test_download_temp_copy_if_needed(self, mock_copy):
        temp_file_manager = processing_utils.TempFileManager()
        url1 = "https://raw.githubusercontent.com/gradio-app/gradio/main/gradio/test_data/test_image.png"
        url2 = "https://raw.githubusercontent.com/gradio-app/gradio/main/gradio/test_data/cheetah1.jpg"

        f = temp_file_manager.download_temp_copy_if_needed(url1)
        try:  # Delete if already exists from before this test
            os.remove(f)
        except OSError:
            pass

        f = temp_file_manager.download_temp_copy_if_needed(url1)
        assert mock_copy.called
        assert len(temp_file_manager.temp_files) == 1

        f = temp_file_manager.download_temp_copy_if_needed(url1)
        assert len(temp_file_manager.temp_files) == 1

        f = temp_file_manager.download_temp_copy_if_needed(url2)
        assert len(temp_file_manager.temp_files) == 2


class TestOutputPreprocessing:
    def test_decode_base64_to_binary(self):
        binary = processing_utils.decode_base64_to_binary(
            deepcopy(media_data.BASE64_IMAGE)
        )
        assert deepcopy(media_data.BINARY_IMAGE) == binary

    def test_decode_base64_to_file(self):
        temp_file = processing_utils.decode_base64_to_file(
            deepcopy(media_data.BASE64_IMAGE)
        )
        assert isinstance(temp_file, tempfile._TemporaryFileWrapper)

    float_dtype_list = [
        float,
        float,
        np.double,
        np.single,
        np.float32,
        np.float64,
        "float32",
        "float64",
    ]

    def test_float_conversion_dtype(self):
        """Test any convertion from a float dtype to an other."""

        x = np.array([-1, 1])
        # Test all combinations of dtypes conversions
        dtype_combin = np.array(
            np.meshgrid(
                TestOutputPreprocessing.float_dtype_list,
                TestOutputPreprocessing.float_dtype_list,
            )
        ).T.reshape(-1, 2)

        for dtype_in, dtype_out in dtype_combin:
            x = x.astype(dtype_in)
            y = processing_utils._convert(x, dtype_out)
            assert y.dtype == np.dtype(dtype_out)

    def test_subclass_conversion(self):
        """Check subclass conversion behavior"""
        x = np.array([-1, 1])
        for dtype in TestOutputPreprocessing.float_dtype_list:
            x = x.astype(dtype)
            y = processing_utils._convert(x, np.floating)
            assert y.dtype == x.dtype


class TestVideoProcessing:
    def test_video_has_playable_codecs(self, test_file_dir):
        assert processing_utils.video_is_playable(
            str(test_file_dir / "video_sample.mp4")
        )
        assert processing_utils.video_is_playable(
            str(test_file_dir / "video_sample.ogg")
        )
        assert processing_utils.video_is_playable(
            str(test_file_dir / "video_sample.webm")
        )
        assert not processing_utils.video_is_playable(
            str(test_file_dir / "bad_video_sample.mp4")
        )

    def raise_ffmpy_runtime_exception(*args, **kwargs):
        raise ffmpy.FFRuntimeError("", "", "", "")

    @pytest.mark.parametrize(
        "exception_to_raise", [raise_ffmpy_runtime_exception, KeyError(), IndexError()]
    )
    def test_video_has_playable_codecs_catches_exceptions(
        self, exception_to_raise, test_file_dir
    ):
        with patch("ffmpy.FFprobe.run", side_effect=exception_to_raise):
            with tempfile.NamedTemporaryFile(
                suffix="out.avi", delete=False
            ) as tmp_not_playable_vid:
                shutil.copy(
                    str(test_file_dir / "bad_video_sample.mp4"),
                    tmp_not_playable_vid.name,
                )
                assert processing_utils.video_is_playable(tmp_not_playable_vid.name)

    def test_convert_video_to_playable_mp4(self, test_file_dir):
        with tempfile.NamedTemporaryFile(
            suffix="out.avi", delete=False
        ) as tmp_not_playable_vid:
            shutil.copy(
                str(test_file_dir / "bad_video_sample.mp4"), tmp_not_playable_vid.name
            )
            playable_vid = processing_utils.convert_video_to_playable_mp4(
                tmp_not_playable_vid.name
            )
            assert processing_utils.video_is_playable(playable_vid)

    @patch("ffmpy.FFmpeg.run", side_effect=raise_ffmpy_runtime_exception)
    def test_video_conversion_returns_original_video_if_fails(
        self, mock_run, test_file_dir
    ):
        with tempfile.NamedTemporaryFile(
            suffix="out.avi", delete=False
        ) as tmp_not_playable_vid:
            shutil.copy(
                str(test_file_dir / "bad_video_sample.mp4"), tmp_not_playable_vid.name
            )
            playable_vid = processing_utils.convert_video_to_playable_mp4(
                tmp_not_playable_vid.name
            )
            # If the conversion succeeded it'd be .mp4
            assert pathlib.Path(playable_vid).suffix == ".avi"