using Microsoft.Extensions.DependencyInjection;
using Omika.Core.Abstractions;
using Omika.Core.Compatibility;
using Omika.Core.Runtime;
using Omika.Data;
using Omika.Data.Runtime;
using Omika.Data.SchemaDetection;

namespace Omika.Tests.Runtime;

[Collection("ApplicationRuntimeContext")]
public class DatabaseRuntimeInitializerTests
{

    // --- Auto + détecté Batik => succès --------------------------------------

    [Fact]
    public async Task InitializeAsync_AutoWithDetectedBatik_ReturnsSuccess()
    {
        ApplicationRuntimeContext.Reset();
        ApplicationRuntimeContext.Configure(DatabaseSchemaSelection.Auto);
        var detector = new FakeDetector(DatabaseSchemaVersion.Batik);
        var initializer = new DatabaseRuntimeInitializer(detector);

        var result = await initializer.InitializeAsync();

        Assert.True(result.IsSuccess);
        Assert.True(ApplicationRuntimeContext.Current.IsBatik);
        Assert.False(ApplicationRuntimeContext.Current.IsOmika);
        Assert.Equal(DatabaseSchemaVersion.Batik, ApplicationRuntimeContext.Current.DetectedVersion);
    }

    // --- Auto + détecté Omika => succès --------------------------------------

    [Fact]
    public async Task InitializeAsync_AutoWithDetectedOmika_ReturnsSuccess()
    {
        ApplicationRuntimeContext.Reset();
        ApplicationRuntimeContext.Configure(DatabaseSchemaSelection.Auto);
        var detector = new FakeDetector(DatabaseSchemaVersion.Omika);
        var initializer = new DatabaseRuntimeInitializer(detector);

        var result = await initializer.InitializeAsync();

        Assert.True(result.IsSuccess);
        Assert.True(ApplicationRuntimeContext.Current.IsOmika);
        Assert.False(ApplicationRuntimeContext.Current.IsBatik);
        Assert.Equal(DatabaseSchemaVersion.Omika, ApplicationRuntimeContext.Current.DetectedVersion);
    }

    // --- Batik + détecté Batik => succès -------------------------------------

    [Fact]
    public async Task InitializeAsync_BatikWithDetectedBatik_ReturnsSuccess()
    {
        ApplicationRuntimeContext.Reset();
        ApplicationRuntimeContext.Configure(DatabaseSchemaSelection.Batik);
        var detector = new FakeDetector(DatabaseSchemaVersion.Batik);
        var initializer = new DatabaseRuntimeInitializer(detector);

        var result = await initializer.InitializeAsync();

        Assert.True(result.IsSuccess);
        Assert.True(ApplicationRuntimeContext.Current.IsBatik);
        Assert.Equal(DatabaseSchemaVersion.Batik, ApplicationRuntimeContext.Current.DetectedVersion);
    }

    // --- Omika + détecté Omika => succès -------------------------------------

    [Fact]
    public async Task InitializeAsync_OmikaWithDetectedOmika_ReturnsSuccess()
    {
        ApplicationRuntimeContext.Reset();
        ApplicationRuntimeContext.Configure(DatabaseSchemaSelection.Omika);
        var detector = new FakeDetector(DatabaseSchemaVersion.Omika);
        var initializer = new DatabaseRuntimeInitializer(detector);

        var result = await initializer.InitializeAsync();

        Assert.True(result.IsSuccess);
        Assert.True(ApplicationRuntimeContext.Current.IsOmika);
        Assert.Equal(DatabaseSchemaVersion.Omika, ApplicationRuntimeContext.Current.DetectedVersion);
    }

    // --- Batik + détecté Omika => échec --------------------------------------

    [Fact]
    public async Task InitializeAsync_BatikWithDetectedOmika_ReturnsFailureAndKeepsUnknown()
    {
        ApplicationRuntimeContext.Reset();
        ApplicationRuntimeContext.Configure(DatabaseSchemaSelection.Batik);
        var detector = new FakeDetector(DatabaseSchemaVersion.Omika);
        var initializer = new DatabaseRuntimeInitializer(detector);

        var result = await initializer.InitializeAsync();

        Assert.True(result.IsFailure);
        Assert.NotEmpty(result.Errors);
        Assert.Equal(DatabaseSchemaVersion.Unknown, ApplicationRuntimeContext.Current.DetectedVersion);
        Assert.False(ApplicationRuntimeContext.Current.IsBatik);
        Assert.False(ApplicationRuntimeContext.Current.IsOmika);
    }

    // --- Omika + détecté Batik => échec --------------------------------------

    [Fact]
    public async Task InitializeAsync_OmikaWithDetectedBatik_ReturnsFailureAndKeepsUnknown()
    {
        ApplicationRuntimeContext.Reset();
        ApplicationRuntimeContext.Configure(DatabaseSchemaSelection.Omika);
        var detector = new FakeDetector(DatabaseSchemaVersion.Batik);
        var initializer = new DatabaseRuntimeInitializer(detector);

        var result = await initializer.InitializeAsync();

        Assert.True(result.IsFailure);
        Assert.NotEmpty(result.Errors);
        Assert.Equal(DatabaseSchemaVersion.Unknown, ApplicationRuntimeContext.Current.DetectedVersion);
        Assert.False(ApplicationRuntimeContext.Current.IsBatik);
        Assert.False(ApplicationRuntimeContext.Current.IsOmika);
    }

    // --- Unknown => échec ----------------------------------------------------

    [Fact]
    public async Task InitializeAsync_DetectedUnknown_ReturnsFailureAndKeepsUnknown()
    {
        ApplicationRuntimeContext.Reset();
        ApplicationRuntimeContext.Configure(DatabaseSchemaSelection.Auto);
        var detector = new FakeDetector(DatabaseSchemaVersion.Unknown);
        var initializer = new DatabaseRuntimeInitializer(detector);

        var result = await initializer.InitializeAsync();

        Assert.True(result.IsFailure);
        Assert.NotEmpty(result.Errors);
        Assert.Equal(DatabaseSchemaVersion.Unknown, ApplicationRuntimeContext.Current.DetectedVersion);
        Assert.False(ApplicationRuntimeContext.Current.IsBatik);
        Assert.False(ApplicationRuntimeContext.Current.IsOmika);
    }

    // --- échec du détecteur => runtime non activé ----------------------------

    [Fact]
    public async Task InitializeAsync_DetectorFailure_ReturnsFailureAndDoesNotActivateRuntime()
    {
        ApplicationRuntimeContext.Reset();
        ApplicationRuntimeContext.Configure(DatabaseSchemaSelection.Auto);
        var detector = new FakeDetector(Result<DatabaseSchemaVersion>.Failure("Échec de lecture des métadonnées."));
        var initializer = new DatabaseRuntimeInitializer(detector);

        var result = await initializer.InitializeAsync();

        Assert.True(result.IsFailure);
        Assert.Contains("métadonnées", result.Errors[0], StringComparison.OrdinalIgnoreCase);
        Assert.Equal(DatabaseSchemaVersion.Unknown, ApplicationRuntimeContext.Current.DetectedVersion);
        Assert.False(ApplicationRuntimeContext.Current.IsBatik);
        Assert.False(ApplicationRuntimeContext.Current.IsOmika);
    }

    // --- cancellation => propagation correcte --------------------------------

    [Fact]
    public async Task InitializeAsync_CancellationRequested_Propagates()
    {
        ApplicationRuntimeContext.Reset();
        ApplicationRuntimeContext.Configure(DatabaseSchemaSelection.Auto);
        var detector = new FakeDetector(DatabaseSchemaVersion.Batik);
        var initializer = new DatabaseRuntimeInitializer(detector);
        using var cts = new CancellationTokenSource();
        cts.Cancel();

        await Assert.ThrowsAnyAsync<OperationCanceledException>(
            () => initializer.InitializeAsync(cts.Token));
    }

    // --- détecteur appelé une seule fois par initialisation ------------------

    [Fact]
    public async Task InitializeAsync_DetectorCalledExactlyOnce()
    {
        ApplicationRuntimeContext.Reset();
        ApplicationRuntimeContext.Configure(DatabaseSchemaSelection.Auto);
        var detector = new FakeDetector(DatabaseSchemaVersion.Omika);
        var initializer = new DatabaseRuntimeInitializer(detector);

        await initializer.InitializeAsync();

        Assert.Equal(1, detector.DetectCallCount);
    }

    // --- DetectedVersion renseigné uniquement après succès -------------------

    [Fact]
    public async Task InitializeAsync_DetectedVersionSetOnlyOnSuccess()
    {
        ApplicationRuntimeContext.Reset();
        ApplicationRuntimeContext.Configure(DatabaseSchemaSelection.Omika);
        var detector = new FakeDetector(DatabaseSchemaVersion.Batik);
        var initializer = new DatabaseRuntimeInitializer(detector);

        var result = await initializer.InitializeAsync();

        Assert.True(result.IsFailure);
        Assert.Equal(DatabaseSchemaVersion.Unknown, ApplicationRuntimeContext.Current.DetectedVersion);
    }

    // --- IsBatik correct après Batik -----------------------------------------

    [Fact]
    public async Task InitializeAsync_AfterBatik_IsBatikTrue()
    {
        ApplicationRuntimeContext.Reset();
        ApplicationRuntimeContext.Configure(DatabaseSchemaSelection.Auto);
        var initializer = new DatabaseRuntimeInitializer(new FakeDetector(DatabaseSchemaVersion.Batik));

        await initializer.InitializeAsync();

        Assert.True(ApplicationRuntimeContext.Current.IsBatik);
        Assert.False(ApplicationRuntimeContext.Current.IsOmika);
    }

    // --- IsOmika correct après Omika -----------------------------------------

    [Fact]
    public async Task InitializeAsync_AfterOmika_IsOmikaTrue()
    {
        ApplicationRuntimeContext.Reset();
        ApplicationRuntimeContext.Configure(DatabaseSchemaSelection.Auto);
        var initializer = new DatabaseRuntimeInitializer(new FakeDetector(DatabaseSchemaVersion.Omika));

        await initializer.InitializeAsync();

        Assert.True(ApplicationRuntimeContext.Current.IsOmika);
        Assert.False(ApplicationRuntimeContext.Current.IsBatik);
    }

    // --- capabilities cohérentes avec la version détectée --------------------

    [Fact]
    public async Task InitializeAsync_AfterOmika_CapabilitiesReflectDetectedVersion()
    {
        ApplicationRuntimeContext.Reset();
        ApplicationRuntimeContext.Configure(DatabaseSchemaSelection.Auto);
        var initializer = new DatabaseRuntimeInitializer(new FakeDetector(DatabaseSchemaVersion.Omika));

        await initializer.InitializeAsync();

        var capabilities = ApplicationRuntimeContext.Current.Capabilities;
        Assert.Equal(DatabaseSchemaVersion.Omika, capabilities.Version);
        Assert.True(capabilities.SupportsEntityGuids);
        Assert.True(capabilities.SupportsRoles);
    }

    [Fact]
    public async Task InitializeAsync_AfterBatik_CapabilitiesReflectDetectedVersion()
    {
        ApplicationRuntimeContext.Reset();
        ApplicationRuntimeContext.Configure(DatabaseSchemaSelection.Auto);
        var initializer = new DatabaseRuntimeInitializer(new FakeDetector(DatabaseSchemaVersion.Batik));

        await initializer.InitializeAsync();

        var capabilities = ApplicationRuntimeContext.Current.Capabilities;
        Assert.Equal(DatabaseSchemaVersion.Batik, capabilities.Version);
        Assert.False(capabilities.SupportsEntityGuids);
        Assert.False(capabilities.SupportsRoles);
    }

    // --- aucune sélection configurée utilisée comme version détectée ---------

    [Fact]
    public async Task InitializeAsync_SelectionIsNeverUsedAsDetectedVersion()
    {
        ApplicationRuntimeContext.Reset();
        // Sélection Omika, mais la base réellement détectée est Batik.
        ApplicationRuntimeContext.Configure(DatabaseSchemaSelection.Omika);
        var initializer = new DatabaseRuntimeInitializer(new FakeDetector(DatabaseSchemaVersion.Batik));

        var result = await initializer.InitializeAsync();

        // La sélection ne doit jamais être prise pour la version détectée : échec.
        Assert.True(result.IsFailure);
        Assert.Equal(DatabaseSchemaVersion.Unknown, ApplicationRuntimeContext.Current.DetectedVersion);
    }

    // --- aucun secret dans les messages d'erreur -----------------------------

    [Fact]
    public async Task InitializeAsync_ErrorMessagesDoNotContainSecrets()
    {
        ApplicationRuntimeContext.Reset();
        ApplicationRuntimeContext.Configure(DatabaseSchemaSelection.Batik);
        var detector = new FakeDetector(DatabaseSchemaVersion.Omika);
        var initializer = new DatabaseRuntimeInitializer(detector);

        var result = await initializer.InitializeAsync();

        Assert.True(result.IsFailure);
        foreach (var error in result.Errors)
        {
            Assert.DoesNotContain("password", error, StringComparison.OrdinalIgnoreCase);
            Assert.DoesNotContain("pwd", error, StringComparison.OrdinalIgnoreCase);
            Assert.DoesNotContain("connectionstring", error, StringComparison.OrdinalIgnoreCase);
            Assert.DoesNotContain("dsn", error, StringComparison.OrdinalIgnoreCase);
        }
    }

    // --- service d'initialisation enregistré en Scoped -----------------------

    [Fact]
    public void AddOmikaData_RegistersInitializerAsScoped()
    {
        var services = new ServiceCollection();
        services.AddOmikaData();

        var descriptor = services.Single(d => d.ServiceType == typeof(IDatabaseRuntimeInitializer));

        Assert.Equal(ServiceLifetime.Scoped, descriptor.Lifetime);
        Assert.Equal(typeof(DatabaseRuntimeInitializer), descriptor.ImplementationType);
    }

    // --- Program utilise un scope correct pour les services Scoped -----------

    [Fact]
    public void AddOmikaData_InitializerDependsOnScopedDetector()
    {
        var services = new ServiceCollection();
        services.AddOmikaData();

        var initializerDescriptor = services.Single(d => d.ServiceType == typeof(IDatabaseRuntimeInitializer));
        var detectorDescriptor = services.Single(d => d.ServiceType == typeof(IDatabaseSchemaDetector));

        // L'initialisateur consomme le détecteur du scope courant : les deux sont Scoped.
        Assert.Equal(ServiceLifetime.Scoped, initializerDescriptor.Lifetime);
        Assert.Equal(ServiceLifetime.Scoped, detectorDescriptor.Lifetime);
    }

    // --- Fake de détecteur ---------------------------------------------------

    private sealed class FakeDetector : IDatabaseSchemaDetector
    {
        private readonly Result<DatabaseSchemaVersion> _result;

        public FakeDetector(DatabaseSchemaVersion version)
            : this(Result<DatabaseSchemaVersion>.Success(version))
        {
        }

        public FakeDetector(Result<DatabaseSchemaVersion> result)
        {
            _result = result;
        }

        public int DetectCallCount { get; private set; }

        public Task<Result<DatabaseSchemaVersion>> DetectAsync(CancellationToken cancellationToken = default)
        {
            cancellationToken.ThrowIfCancellationRequested();
            DetectCallCount++;
            return Task.FromResult(_result);
        }
    }
}