"""Tests for audio utility functions."""

import hashlib
import tempfile
from pathlib import Path
from unittest.mock import patch

import pytest

from app.utils.audio import get_audio_duration, get_file_hash, get_file_size


class TestAudioUtils:
    """Test audio utility functions."""

    def test_get_file_hash(self):
        """Test file hash calculation."""
        # Create a temporary file with known content
        test_content = "test content for hashing"
        with tempfile.NamedTemporaryFile(mode="w", delete=False) as f:
            f.write(test_content)
            temp_path = Path(f.name)

        try:
            # Calculate hash using our function
            result_hash = get_file_hash(temp_path)

            # Calculate expected hash manually
            expected_hash = hashlib.sha256(test_content.encode()).hexdigest()

            # Verify the hash is correct
            assert result_hash == expected_hash
            assert len(result_hash) == 64  # SHA-256 hash length
            assert isinstance(result_hash, str)

        finally:
            temp_path.unlink()

    def test_get_file_hash_binary_content(self):
        """Test file hash calculation with binary content."""
        # Create a temporary file with binary content
        test_bytes = b"\x00\x01\x02\x03\xff\xfe\xfd"
        with tempfile.NamedTemporaryFile(mode="wb", delete=False) as f:
            f.write(test_bytes)
            temp_path = Path(f.name)

        try:
            # Calculate hash using our function
            result_hash = get_file_hash(temp_path)

            # Calculate expected hash manually
            expected_hash = hashlib.sha256(test_bytes).hexdigest()

            # Verify the hash is correct
            assert result_hash == expected_hash
            assert len(result_hash) == 64  # SHA-256 hash length
            assert isinstance(result_hash, str)

        finally:
            temp_path.unlink()

    def test_get_file_hash_empty_file(self):
        """Test file hash calculation for empty file."""
        # Create an empty temporary file
        with tempfile.NamedTemporaryFile(delete=False) as f:
            temp_path = Path(f.name)

        try:
            # Calculate hash using our function
            result_hash = get_file_hash(temp_path)

            # Calculate expected hash for empty content
            expected_hash = hashlib.sha256(b"").hexdigest()

            # Verify the hash is correct
            assert result_hash == expected_hash
            assert len(result_hash) == 64  # SHA-256 hash length
            assert isinstance(result_hash, str)

        finally:
            temp_path.unlink()

    def test_get_file_hash_large_file(self):
        """Test file hash calculation for large file (tests chunked reading)."""
        # Create a large temporary file (larger than 4096 bytes chunk size)
        test_content = "A" * 10000  # 10KB of 'A' characters
        with tempfile.NamedTemporaryFile(mode="w", delete=False) as f:
            f.write(test_content)
            temp_path = Path(f.name)

        try:
            # Calculate hash using our function
            result_hash = get_file_hash(temp_path)

            # Calculate expected hash manually
            expected_hash = hashlib.sha256(test_content.encode()).hexdigest()

            # Verify the hash is correct
            assert result_hash == expected_hash
            assert len(result_hash) == 64  # SHA-256 hash length
            assert isinstance(result_hash, str)

        finally:
            temp_path.unlink()

    def test_get_file_size(self):
        """Test file size calculation."""
        # Create a temporary file with known content
        test_content = "test content for size calculation"
        with tempfile.NamedTemporaryFile(mode="w", delete=False) as f:
            f.write(test_content)
            temp_path = Path(f.name)

        try:
            # Get size using our function
            result_size = get_file_size(temp_path)

            # Get expected size using pathlib directly
            expected_size = temp_path.stat().st_size

            # Verify the size is correct
            assert result_size == expected_size
            assert result_size > 0
            assert isinstance(result_size, int)

        finally:
            temp_path.unlink()

    def test_get_file_size_empty_file(self):
        """Test file size calculation for empty file."""
        # Create an empty temporary file
        with tempfile.NamedTemporaryFile(delete=False) as f:
            temp_path = Path(f.name)

        try:
            # Get size using our function
            result_size = get_file_size(temp_path)

            # Verify the size is zero
            assert result_size == 0
            assert isinstance(result_size, int)

        finally:
            temp_path.unlink()

    def test_get_file_size_binary_file(self):
        """Test file size calculation for binary file."""
        # Create a temporary file with binary content
        test_bytes = b"\x00\x01\x02\x03\xff\xfe\xfd" * 100  # 700 bytes
        with tempfile.NamedTemporaryFile(mode="wb", delete=False) as f:
            f.write(test_bytes)
            temp_path = Path(f.name)

        try:
            # Get size using our function
            result_size = get_file_size(temp_path)

            # Verify the size is correct
            assert result_size == len(test_bytes)
            assert result_size == 700
            assert isinstance(result_size, int)

        finally:
            temp_path.unlink()

    @patch("app.utils.audio.ffmpeg.probe")
    def test_get_audio_duration_success(self, mock_probe):
        """Test successful audio duration extraction."""
        # Mock ffmpeg.probe to return duration
        mock_probe.return_value = {"format": {"duration": "123.456"}}

        temp_path = Path("/fake/path/test.mp3")
        duration = get_audio_duration(temp_path)

        # Verify duration is converted correctly (seconds to milliseconds)
        assert duration == 123456  # 123.456 seconds * 1000 = 123456 ms
        assert isinstance(duration, int)
        mock_probe.assert_called_once_with(str(temp_path))

    @patch("app.utils.audio.ffmpeg.probe")
    def test_get_audio_duration_integer_duration(self, mock_probe):
        """Test audio duration extraction with integer duration."""
        # Mock ffmpeg.probe to return integer duration
        mock_probe.return_value = {"format": {"duration": "60"}}

        temp_path = Path("/fake/path/test.wav")
        duration = get_audio_duration(temp_path)

        # Verify duration is converted correctly
        assert duration == 60000  # 60 seconds * 1000 = 60000 ms
        assert isinstance(duration, int)
        mock_probe.assert_called_once_with(str(temp_path))

    @patch("app.utils.audio.ffmpeg.probe")
    def test_get_audio_duration_zero_duration(self, mock_probe):
        """Test audio duration extraction with zero duration."""
        # Mock ffmpeg.probe to return zero duration
        mock_probe.return_value = {"format": {"duration": "0.0"}}

        temp_path = Path("/fake/path/silent.mp3")
        duration = get_audio_duration(temp_path)

        # Verify duration is zero
        assert duration == 0
        assert isinstance(duration, int)
        mock_probe.assert_called_once_with(str(temp_path))

    @patch("app.utils.audio.ffmpeg.probe")
    def test_get_audio_duration_fractional_duration(self, mock_probe):
        """Test audio duration extraction with fractional seconds."""
        # Mock ffmpeg.probe to return fractional duration
        mock_probe.return_value = {"format": {"duration": "45.123"}}

        temp_path = Path("/fake/path/test.flac")
        duration = get_audio_duration(temp_path)

        # Verify duration is converted and rounded correctly
        assert duration == 45123  # 45.123 seconds * 1000 = 45123 ms
        assert isinstance(duration, int)
        mock_probe.assert_called_once_with(str(temp_path))

    @patch("app.utils.audio.ffmpeg.probe")
    def test_get_audio_duration_ffmpeg_error(self, mock_probe):
        """Test audio duration extraction when ffmpeg fails."""
        # Mock ffmpeg.probe to raise an exception
        mock_probe.side_effect = Exception("FFmpeg error: file not found")

        temp_path = Path("/fake/path/nonexistent.mp3")
        duration = get_audio_duration(temp_path)

        # Verify duration defaults to 0 on error
        assert duration == 0
        assert isinstance(duration, int)
        mock_probe.assert_called_once_with(str(temp_path))

    @patch("app.utils.audio.ffmpeg.probe")
    def test_get_audio_duration_missing_format(self, mock_probe):
        """Test audio duration extraction when format info is missing."""
        # Mock ffmpeg.probe to return data without format info
        mock_probe.return_value = {"streams": []}

        temp_path = Path("/fake/path/corrupt.mp3")
        duration = get_audio_duration(temp_path)

        # Verify duration defaults to 0 when format info is missing
        assert duration == 0
        assert isinstance(duration, int)
        mock_probe.assert_called_once_with(str(temp_path))

    @patch("app.utils.audio.ffmpeg.probe")
    def test_get_audio_duration_missing_duration(self, mock_probe):
        """Test audio duration extraction when duration is missing."""
        # Mock ffmpeg.probe to return format without duration
        mock_probe.return_value = {"format": {"size": "1024"}}

        temp_path = Path("/fake/path/noduration.mp3")
        duration = get_audio_duration(temp_path)

        # Verify duration defaults to 0 when duration is missing
        assert duration == 0
        assert isinstance(duration, int)
        mock_probe.assert_called_once_with(str(temp_path))

    @patch("app.utils.audio.ffmpeg.probe")
    def test_get_audio_duration_invalid_duration(self, mock_probe):
        """Test audio duration extraction with invalid duration value."""
        # Mock ffmpeg.probe to return invalid duration
        mock_probe.return_value = {"format": {"duration": "invalid"}}

        temp_path = Path("/fake/path/invalid.mp3")
        duration = get_audio_duration(temp_path)

        # Verify duration defaults to 0 when duration is invalid
        assert duration == 0
        assert isinstance(duration, int)
        mock_probe.assert_called_once_with(str(temp_path))

    def test_get_file_hash_nonexistent_file(self):
        """Test file hash calculation for nonexistent file."""
        nonexistent_path = Path("/fake/nonexistent/file.mp3")

        # Should raise FileNotFoundError for nonexistent file
        with pytest.raises(FileNotFoundError):
            get_file_hash(nonexistent_path)

    def test_get_file_size_nonexistent_file(self):
        """Test file size calculation for nonexistent file."""
        nonexistent_path = Path("/fake/nonexistent/file.mp3")

        # Should raise FileNotFoundError for nonexistent file
        with pytest.raises(FileNotFoundError):
            get_file_size(nonexistent_path)