using Omika.Core.Contracts.Mobile.Sync;
using Omika.Core.Interfaces.Mobile;
using Omika.Core.Services.Mobile;

namespace Omika.Tests.Mobile;

/// <summary>
/// Tests de la réception et du suivi des opérations de synchronisation.
/// </summary>
public class SyncOperationServiceTests
{
    private const string DeviceId = "device-1";

    private static MobileTokenIdentity Identity() => new()
    {
        CodeClient = "BATIK.01",
        DeviceId = DeviceId,
        UserId = "user-1",
        CollaborateurId = "collab-1",
        NumeroLicence = "lic-1"
    };

    private static SyncOperation ValidOperation(SyncOperationType type = SyncOperationType.Create)
    {
        return new SyncOperation
        {
            OperationId = Guid.NewGuid(),
            DeviceId = DeviceId,
            EntityType = "Client",
            OperationType = type,
            EntityGuid = Guid.NewGuid(),
            Payload = "{}"
        };
    }

    [Fact]
    public async Task Receive_Valid_Operation_Returns_Received()
    {
        // Arrange
        var repo = new FakeSyncTransferRepository();
        var service = new SyncOperationService(repo);
        var op = ValidOperation();

        // Act
        var receipt = await service.ReceiveAsync(op, Identity());

        // Assert
        Assert.Equal("RECEIVED", receipt.Status);
        Assert.Equal(op.OperationId, receipt.OperationId);
        Assert.True(repo.Inserted);
        Assert.True(repo.Logged);
    }

    [Fact]
    public async Task Receive_Empty_OperationId_Throws()
    {
        // Arrange
        var repo = new FakeSyncTransferRepository();
        var service = new SyncOperationService(repo);
        var op = ValidOperation() with { OperationId = Guid.Empty };

        // Act & Assert
        await Assert.ThrowsAsync<ArgumentException>(() => service.ReceiveAsync(op, Identity()));
    }

    [Fact]
    public async Task Receive_Incoherent_DeviceId_Throws()
    {
        // Arrange
        var repo = new FakeSyncTransferRepository();
        var service = new SyncOperationService(repo);
        var op = ValidOperation();

        // Act & Assert : DeviceId de l'opération != identité authentifiée.
        var otherIdentity = Identity() with { DeviceId = "autre-device" };
        await Assert.ThrowsAsync<UnauthorizedAccessException>(
            () => service.ReceiveAsync(op, otherIdentity));
    }

    [Fact]
    public async Task Receive_Duplicate_Operation_Does_Not_Insert_Twice()
    {
        // Arrange
        var repo = new FakeSyncTransferRepository();
        var service = new SyncOperationService(repo);
        var op = ValidOperation();

        // Premier envoi.
        await service.ReceiveAsync(op, Identity());

        // Le repository signale que l'opération existe déjà.
        repo.ExistingState = SyncOperationState.Pending;

        // Act : second envoi (dupliqué).
        var receipt = await service.ReceiveAsync(op, Identity());

        // Assert : RECEIVED sans nouvelle insertion.
        Assert.Equal("RECEIVED", receipt.Status);
        Assert.Equal(1, repo.InsertCount);
    }

    [Fact]
    public async Task GetStatus_Unknown_Operation_Returns_StatusNotAvailable()
    {
        // Arrange
        var repo = new FakeSyncTransferRepository();
        var service = new SyncOperationService(repo);

        // Act
        var status = await service.GetStatusAsync(Guid.NewGuid(), DeviceId);

        // Assert
        Assert.Equal(SyncStatus.StatusNotAvailable, status.Status);
    }

    [Fact]
    public async Task GetStatus_Pending_Operation_Returns_Pending()
    {
        // Arrange
        var repo = new FakeSyncTransferRepository
        {
            Status = new SyncStatusResponse
            {
                OperationId = Guid.NewGuid(),
                Status = SyncStatus.Pending,
                DeviceId = DeviceId
            }
        };
        var service = new SyncOperationService(repo);

        // Act
        var status = await service.GetStatusAsync(repo.Status.OperationId, DeviceId);

        // Assert
        Assert.Equal(SyncStatus.Pending, status.Status);
    }

    [Fact]
    public async Task GetStatus_Success_Operation_Returns_Success()
    {
        // Arrange
        var repo = new FakeSyncTransferRepository
        {
            Status = new SyncStatusResponse
            {
                OperationId = Guid.NewGuid(),
                Status = SyncStatus.Success,
                DeviceId = DeviceId
            }
        };
        var service = new SyncOperationService(repo);

        // Act
        var status = await service.GetStatusAsync(repo.Status.OperationId, DeviceId);

        // Assert
        Assert.Equal(SyncStatus.Success, status.Status);
    }

    [Fact]
    public async Task GetStatus_Rejected_Operation_Returns_Rejected()
    {
        // Arrange
        var repo = new FakeSyncTransferRepository
        {
            Status = new SyncStatusResponse
            {
                OperationId = Guid.NewGuid(),
                Status = SyncStatus.Rejected,
                DeviceId = DeviceId
            }
        };
        var service = new SyncOperationService(repo);

        // Act
        var status = await service.GetStatusAsync(repo.Status.OperationId, DeviceId);

        // Assert
        Assert.Equal(SyncStatus.Rejected, status.Status);
    }

    [Fact]
    public async Task GetStatus_Empty_OperationId_Throws()
    {
        // Arrange
        var repo = new FakeSyncTransferRepository();
        var service = new SyncOperationService(repo);

        // Act & Assert
        await Assert.ThrowsAsync<ArgumentException>(() => service.GetStatusAsync(Guid.Empty, DeviceId));
    }

    // ===== Fake =====

    private sealed class FakeSyncTransferRepository : ISyncTransferRepository
    {
        public bool Inserted { get; private set; }
        public bool Logged { get; private set; }
        public int InsertCount { get; private set; }
        public SyncOperationState ExistingState { get; set; } = SyncOperationState.Unknown;
        public SyncStatusResponse? Status { get; set; }

        public Task<bool> ExistsAsync(Guid operationId, CancellationToken cancellationToken = default)
            => Task.FromResult(ExistingState != SyncOperationState.Unknown);

        public Task<SyncOperationState> GetExistingStateAsync(Guid operationId, CancellationToken cancellationToken = default)
            => Task.FromResult(ExistingState);

        public Task InsertToSrvAsync(SyncEnvelope envelope, CancellationToken cancellationToken = default)
        {
            Inserted = true;
            InsertCount++;
            return Task.CompletedTask;
        }

        public Task<SyncStatusResponse?> GetStatusAsync(Guid operationId, string deviceId, CancellationToken cancellationToken = default)
            => Task.FromResult(Status);

        public Task<SyncLogEntry?> GetTerminalResultAsync(Guid operationId, CancellationToken cancellationToken = default)
            => Task.FromResult<SyncLogEntry?>(null);

        public Task WriteLogAsync(SyncLogEntry entry, CancellationToken cancellationToken = default)
        {
            Logged = true;
            return Task.CompletedTask;
        }


        public Task<int> PurgeLogsAsync(DateTime cutoffUtc, CancellationToken cancellationToken = default)
            => Task.FromResult(0);

        public Task<int> TransferToReceptionAsync(CancellationToken cancellationToken = default)
            => Task.FromResult(0);

        public Task<IReadOnlyList<SyncEnvelope>> GetPendingOperationsAsync(CancellationToken cancellationToken = default)
            => Task.FromResult<IReadOnlyList<SyncEnvelope>>(Array.Empty<SyncEnvelope>());

        public Task MarkSuccessAsync(SyncLogEntry entry, CancellationToken cancellationToken = default)
            => Task.CompletedTask;

        public Task MarkRejectedAsync(SyncLogEntry entry, CancellationToken cancellationToken = default)
            => Task.CompletedTask;

        public Task IncrementRetryAsync(Guid operationId, int newRetryCount, DateTime nextAttemptUtc, CancellationToken cancellationToken = default)
            => Task.CompletedTask;
    }
}