using System.Data.Common;
using EntitlementBLL.Exceptions;
using EntitlementBLL.Implementations;
using EntitlementDAL.DTOs;
using EntitlementDAL.Interfaces;
using GB5Shared.DTO.Framework.Login;
using GB5Shared.QueryExecutor;
using Moq;
using Xunit;

namespace EntitlementTests;

/// <summary>
/// Covers the new ILicenseBLL.GetSeatsByClientAsync — the ownership-safe, client-facing equivalent
/// of GetSeatsAsync(subscriptionId,...), which has no ownership check at all. A client can only
/// ever supply their own ClientId (from JWT claims, never a SubscriptionId), so this resolves the
/// caller's own subscription first via ISubscriptionDAL before ever touching license rows.
/// </summary>
public class LicenseBLLTests
{
    private static LoginDTO TestLogin() => new() { ClientId = 42, UserId = -1 };

    [Fact]
    public async Task Test_GetSeatsByClientAsync_ClientHasSubscription_ReturnsItsSeats()
    {
        var subscriptionDal = new Mock<ISubscriptionDAL>();
        var licenseDal       = new Mock<ILicenseDAL>();
        var queryExecutor    = new Mock<IQueryExecutor>();

        subscriptionDal.Setup(d => d.GetByClientAsync(42, It.IsAny<LoginDTO>(), It.IsAny<CancellationToken>()))
            .ReturnsAsync(new SubscriptionDTO { SubscriptionId = 10, ClientId = 42 });
        licenseDal.Setup(d => d.GetBySubscriptionAsync(10, It.IsAny<LoginDTO>(), It.IsAny<CancellationToken>()))
            .ReturnsAsync(new List<LicenseDTO> { new() { LicenseId = 1, SubscriptionId = 10, LicenseType = 0, Seats = 5 } });

        var svc = new LicenseBLL(licenseDal.Object, subscriptionDal.Object, queryExecutor.Object);

        var result = await svc.GetSeatsByClientAsync(42, TestLogin(), CancellationToken.None);

        Assert.Single(result);
        licenseDal.Verify(d => d.GetBySubscriptionAsync(10, It.IsAny<LoginDTO>(), It.IsAny<CancellationToken>()), Times.Once);
    }

    [Fact]
    public async Task Test_GetSeatsByClientAsync_ClientHasNoSubscription_Throws_NeverQueriesLicenses()
    {
        var subscriptionDal = new Mock<ISubscriptionDAL>();
        var licenseDal       = new Mock<ILicenseDAL>();
        var queryExecutor    = new Mock<IQueryExecutor>();

        subscriptionDal.Setup(d => d.GetByClientAsync(99, It.IsAny<LoginDTO>(), It.IsAny<CancellationToken>()))
            .ReturnsAsync((SubscriptionDTO?)null);

        var svc = new LicenseBLL(licenseDal.Object, subscriptionDal.Object, queryExecutor.Object);

        await Assert.ThrowsAsync<EntitlementNotFoundException>(
            () => svc.GetSeatsByClientAsync(99, TestLogin(), CancellationToken.None));

        licenseDal.Verify(d => d.GetBySubscriptionAsync(It.IsAny<int>(), It.IsAny<LoginDTO>(), It.IsAny<CancellationToken>()), Times.Never);
    }
}