using System;
using System.IO;
using System.Threading;
using System.Threading.Tasks;
using Jellyfin.Plugin.JRay.Configuration;
using Jellyfin.Plugin.JRay.Models;
using Jellyfin.Plugin.JRay.Services;
using MediaBrowser.Common.Configuration;
using Microsoft.Extensions.Logging.Abstractions;
using Xunit;

namespace Jellyfin.Plugin.JRay.Tests;

/// <summary>
/// JR-010 — three sources now deliver truth data (sidecar, pushed, fetched) and
/// they are not interchangeable. A locally computed sidecar and a
/// <c>loose</c>-tier manifest from a third-party server make claims of very
/// different strength about the same item, and the truth file itself records
/// nothing about how it arrived.
///
/// TRACES: UT-024, UT-025, UT-026, UT-027, UT-028 | JR-010
/// </summary>
public class ManagedTruthStoreTests : IDisposable
{
    private readonly string _root;
    private readonly ManagedTruthStore _store;

    public ManagedTruthStoreTests()
    {
        _root = Path.Combine(Path.GetTempPath(), "jray-tests-" + Guid.NewGuid().ToString("N"));
        Directory.CreateDirectory(_root);
        _store = new ManagedTruthStore(new FakePaths(_root), NullLogger<ManagedTruthStore>.Instance);
    }

    public void Dispose()
    {
        GC.SuppressFinalize(this);
        if (Directory.Exists(_root))
        {
            Directory.Delete(_root, recursive: true);
        }
    }

    private static TruthFile Truth()
    {
        var truth = new TruthFile { SchemaVersion = TruthSchema.SupportedVersion, Movie = "/m.mkv" };
        var actor = new TruthActor { Name = "A", TmdbId = "884" };
        actor.Scenes.Add(new TruthScene { Start = 1.0, End = 2.0 });
        truth.Actors.Add(actor);
        return truth;
    }

    // UT-024
    [Fact]
    public async Task SaveAsync_ThenLoadProvenance_RoundTripsAFetchedClaim()
    {
        var id = Guid.NewGuid();
        var recorded = new DateTime(2026, 7, 31, 12, 0, 0, DateTimeKind.Utc);

        await _store.SaveAsync(
            id,
            Truth(),
            new TruthProvenance
            {
                Source = TruthSource.Fetched,
                ServerUrl = "https://jray.example",
                MatchTier = MatchTier.Loose,
                OffsetSec = -12.5,
                Caveat = "loose match",
                RecordedAt = recorded,
            },
            CancellationToken.None);

        var loaded = _store.LoadProvenance(id);

        Assert.NotNull(loaded);
        Assert.Equal(TruthSource.Fetched, loaded!.Source);
        Assert.Equal("https://jray.example", loaded.ServerUrl);
        Assert.Equal(MatchTier.Loose, loaded.MatchTier);

        // The offset is unrecoverable once applied: the stored windows look
        // native, and nothing else would say they had been shifted.
        Assert.Equal(-12.5, loaded.OffsetSec);
        Assert.Equal("loose match", loaded.Caveat);
        Assert.Equal(recorded, loaded.RecordedAt);
    }

    // UT-025
    [Fact]
    public async Task SaveAsync_LocalPush_RecordsNoServerOrTier()
    {
        var id = Guid.NewGuid();

        await _store.SaveAsync(
            id,
            Truth(),
            TruthProvenance.Local(TruthSource.Pushed, DateTime.UtcNow),
            CancellationToken.None);

        var loaded = _store.LoadProvenance(id)!;

        Assert.Equal(TruthSource.Pushed, loaded.Source);
        Assert.Equal(string.Empty, loaded.ServerUrl);

        // A push is about *this* file, so there is no cut to match. A tier here
        // would be a fabricated claim.
        Assert.Null(loaded.MatchTier);
    }

    // UT-026
    [Fact]
    public async Task SaveAsync_DoesNotWriteProvenanceIntoTheTruthFile()
    {
        var id = Guid.NewGuid();
        await _store.SaveAsync(id, Truth(), TruthProvenance.Local(TruthSource.Pushed, DateTime.UtcNow), CancellationToken.None);

        var truthJson = await File.ReadAllTextAsync(
            Path.Combine(_root, "plugins", "configurations", "JRay", "truth", id.ToString("D") + ".json"));

        // JR-004: the bytes served back are the bytes the producer wrote.
        Assert.DoesNotContain("source", truthJson, StringComparison.OrdinalIgnoreCase);
        Assert.DoesNotContain("match_tier", truthJson, StringComparison.OrdinalIgnoreCase);
    }

    // UT-027
    [Fact]
    public async Task Delete_RemovesProvenanceToo()
    {
        var id = Guid.NewGuid();
        await _store.SaveAsync(id, Truth(), TruthProvenance.Local(TruthSource.Pushed, DateTime.UtcNow), CancellationToken.None);

        Assert.True(_store.Delete(id));

        // A stale provenance record outliving its truth file would describe data
        // the next fetch has already replaced.
        Assert.Null(_store.LoadProvenance(id));
        Assert.False(_store.Exists(id));
    }

    // UT-028
    [Fact]
    public void LoadProvenance_ForUnknownItem_ReturnsNull()
    {
        Assert.Null(_store.LoadProvenance(Guid.NewGuid()));
    }

    private sealed class FakePaths : IApplicationPaths
    {
        public FakePaths(string root)
        {
            ProgramDataPath = root;
            PluginsPath = Path.Combine(root, "plugins");
            PluginConfigurationsPath = Path.Combine(root, "plugins", "configurations");
        }

        public string ProgramDataPath { get; }

        public string WebPath => Path.Combine(ProgramDataPath, "web");

        public string ProgramSystemPath => ProgramDataPath;

        public string DataPath => ProgramDataPath;

        public string ImageCachePath => ProgramDataPath;

        public string PluginsPath { get; }

        public string PluginConfigurationsPath { get; }

        public string LogDirectoryPath => ProgramDataPath;

        public string ConfigurationDirectoryPath => ProgramDataPath;

        public string SystemConfigurationFilePath => Path.Combine(ProgramDataPath, "system.xml");

        public string CachePath { get; set; } = string.Empty;

        public string TempDirectory => Path.Combine(ProgramDataPath, "temp");

        public string TrickplayPath => Path.Combine(ProgramDataPath, "trickplay");

        public string VirtualDataPath => ProgramDataPath;

        public string BackupPath => Path.Combine(ProgramDataPath, "backup");

        public void MakeSanityCheckOrThrow()
        {
        }

        public void CreateAndCheckMarker(string path, string markerName, bool recursive = false)
        {
        }
    }
}