using System;
using System.Collections.Generic;
using Paca.Core;
using Xunit;

namespace Paca.Tests.Core;

public class SpeedAndBitrateScheduleExtremeRedTests
{
    private const string SampleInput = "C:\\Media\\input.mp4";
    private const string SampleOutput = "C:\\Media\\output.mp4";

    // ==========================================
    // 1. MediaPlaybackSpeedPitchEngine
    // ==========================================

    [Fact]
    public void MediaPlaybackSpeedPitchEngine_BuildCommandLine_SameInputAndOutput_ThrowsInvalidOperationException()
    {
        Assert.Throws<InvalidOperationException>(() =>
            MediaPlaybackSpeedPitchEngine.BuildSpeedCommandLine(SampleInput, SampleInput, 1.5));
    }

    [Theory]
    [InlineData(null, SampleOutput)]
    [InlineData(SampleInput, null)]
    [InlineData("", SampleOutput)]
    [InlineData(SampleInput, "   ")]
    public void MediaPlaybackSpeedPitchEngine_BuildCommandLine_NullOrWhitespacePaths_ThrowsArgumentException(string? inPath, string? outPath)
    {
        Assert.Throws<ArgumentException>(() =>
            MediaPlaybackSpeedPitchEngine.BuildSpeedCommandLine(inPath!, outPath!, 1.5));
    }

    [Fact]
    public void MediaPlaybackSpeedPitchEngine_BuildCommandLine_PathsWithQuotes_EscapedOrStripped()
    {
        string maliciousIn = "C:\\Media\\in\"put.mp4";
        string maliciousOut = "C:\\Media\\out\"put.mp4";

        var cmd = MediaPlaybackSpeedPitchEngine.BuildSpeedCommandLine(maliciousIn, maliciousOut, 2.0);
        Assert.NotNull(cmd);
        Assert.DoesNotContain("in\"put", cmd);
        Assert.DoesNotContain("out\"put", cmd);
    }

    // ==========================================
    // 2. MediaBitrateEstimator
    // ==========================================

    [Fact]
    public void MediaBitrateEstimator_BuildTwoPassCommands_SameInputAndOutput_ThrowsInvalidOperationException()
    {
        var plan = new BitrateEstimationResult(true, 2500, 128, 50_000_000);
        Assert.Throws<InvalidOperationException>(() =>
            MediaBitrateEstimator.BuildTwoPassCommands(SampleInput, SampleInput, plan));
    }

    [Theory]
    [InlineData(null, SampleOutput)]
    [InlineData(SampleInput, null)]
    [InlineData("", SampleOutput)]
    [InlineData(SampleInput, "   ")]
    public void MediaBitrateEstimator_BuildTwoPassCommands_NullOrWhitespacePaths_ThrowsArgumentException(string? inPath, string? outPath)
    {
        var plan = new BitrateEstimationResult(true, 2500, 128, 50_000_000);
        Assert.Throws<ArgumentException>(() =>
            MediaBitrateEstimator.BuildTwoPassCommands(inPath!, outPath!, plan));
    }

    [Fact]
    public void MediaBitrateEstimator_BuildTwoPassCommands_PathsWithQuotes_EscapedOrStripped()
    {
        var plan = new BitrateEstimationResult(true, 2500, 128, 50_000_000);
        string maliciousIn = "C:\\Media\\in\"put.mp4";
        string maliciousOut = "C:\\Media\\out\"put.mp4";

        var (p1, p2) = MediaBitrateEstimator.BuildTwoPassCommands(maliciousIn, maliciousOut, plan);
        Assert.NotNull(p1);
        Assert.NotNull(p2);
        Assert.DoesNotContain("in\"put", p1);
        Assert.DoesNotContain("out\"put", p2);
    }

    [Theory]
    [InlineData(0)]
    [InlineData(-1024)]
    public void MediaBitrateEstimator_CalculateBitrate_ZeroOrNegativeTarget_ReturnsNotPossible(long badTarget)
    {
        var result = MediaBitrateEstimator.CalculateBitrate(60.0, badTarget);
        Assert.NotNull(result);
        Assert.False(result.IsPossible);
    }

    // ==========================================
    // 3. BandwidthScheduleProfileEngine
    // ==========================================

    [Fact]
    public void BandwidthScheduleProfileEngine_GetActiveProfile_NullConfig_ReturnsSafeDefault()
    {
        var profile = BandwidthScheduleProfileEngine.GetActiveProfile(DateTime.UtcNow, null!);
        Assert.NotNull(profile);
        Assert.Equal("Default", profile.ProfileName);
    }

    [Fact]
    public void BandwidthScheduleProfileEngine_GetActiveProfile_ConfigWithNullRules_SkipsNullRulesSafely()
    {
        var config = new BandwidthScheduleConfig
        {
            IsEnabled = true,
            DefaultProfile = new BandwidthProfile("Default", 0, 4),
            Rules = new List<BandwidthTimeRule>
            {
                null!,
                new(TimeSpan.FromHours(1), TimeSpan.FromHours(2), null!)
            }
        };

        var ex = Record.Exception(() => BandwidthScheduleProfileEngine.GetActiveProfile(DateTime.UtcNow, config));
        Assert.Null(ex);
    }

    // ==========================================
    // 4. HlsManifestValidator
    // ==========================================

    [Fact]
    public void HlsManifestValidator_Analyze_NullManifest_ReturnsSafeEmptyResult()
    {
        var result = HlsManifestValidator.Analyze(null!);
        Assert.NotNull(result);
        Assert.False(result.IsMasterPlaylist);
        Assert.Equal(0, result.SegmentCount);
    }

    [Fact]
    public void HlsManifestValidator_StripAdBlocks_NullManifest_ReturnsEmptyString()
    {
        var stripped = HlsManifestValidator.StripAdBlocks(null!);
        Assert.NotNull(stripped);
    }
}