using Microsoft.Extensions.Logging;
using NSubstitute;
using PnvPanel.Application.Admin.Support;
using PnvPanel.Application.Common.Interfaces;
using PnvPanel.Application.Common.Models;
using PnvPanel.Application.Support;
using PnvPanel.Application.Tests.TestSupport;
using PnvPanel.Domain.Configs;
using PnvPanel.Domain.Inbounds;
using PnvPanel.Domain.Nodes;
using PnvPanel.Domain.Support;
using Xunit;

namespace PnvPanel.Application.Tests.Admin.Support;

public class ApproveExtensionRequestCommandHandlerTests
{
    private readonly IIdentityService _identityService = Substitute.For<IIdentityService>();
    private readonly IXuiPanelGateway _gateway = Substitute.For<IXuiPanelGateway>();
    private readonly IRealtimeNotifier _notifier = Substitute.For<IRealtimeNotifier>();
    private readonly ITelegramNotifier _telegramNotifier = Substitute.For<ITelegramNotifier>();
    private readonly ILogger<ApproveExtensionRequestCommandHandler> _logger = Substitute.For<
        ILogger<ApproveExtensionRequestCommandHandler>
    >();

    private static CurrentUserProfile Profile(Guid userId, DateTimeOffset? paidUntil) =>
        new(
            userId,
            "alice",
            Guid.NewGuid(),
            "premium",
            IsActivated: true,
            IsBlocked: false,
            MaxConfigs: 5,
            MaxIpLimit: 3,
            SubscriptionToken: "sub-token",
            BillingEnabled: true,
            BillingPaidUntil: paidUntil,
            BillingSuspended: paidUntil is null
        );

    private ApproveExtensionRequestCommandHandler CreateHandler(
        PnvPanel.Infrastructure.Persistence.AppDbContext dbContext,
        Guid adminId
    ) =>
        new(
            dbContext,
            _identityService,
            _gateway,
            _notifier,
            _telegramNotifier,
            FakeCurrentUser.Authenticated(adminId, "admin"),
            _logger
        );

    [Fact]
    public async Task Handle_WhenNoPriorPayment_ExtendsFromNowAndResolves()
    {
        using var dbContext = InMemoryDbContextFactory.Create();
        var adminId = Guid.NewGuid();
        var userId = Guid.NewGuid();
        var ticket = SupportTicket.CreateExtensionRequest(userId, 10);
        dbContext.SupportTickets.Add(ticket);
        await dbContext.SaveChangesAsync(CancellationToken.None);

        _identityService
            .GetProfileAsync(userId, Arg.Any<CancellationToken>())
            .Returns(Profile(userId, paidUntil: null));
        _identityService
            .ExtendBillingPaidUntilAsync(userId, Arg.Any<DateTimeOffset>(), Arg.Any<CancellationToken>())
            .Returns(Result.Success());

        var handler = CreateHandler(dbContext, adminId);
        var before = DateTimeOffset.UtcNow;

        var result = await handler.Handle(
            new ApproveExtensionRequestCommand(ticket.Id),
            CancellationToken.None
        );

        Assert.True(result.IsSuccess);
        Assert.Equal(TicketStatus.Resolved, ticket.Status);
        await _identityService
            .Received(1)
            .ExtendBillingPaidUntilAsync(
                userId,
                Arg.Is<DateTimeOffset>(d => d >= before.AddDays(10).AddMinutes(-1)),
                Arg.Any<CancellationToken>()
            );
    }

    [Fact]
    public async Task Handle_ResumesExpiredConfigs()
    {
        using var dbContext = InMemoryDbContextFactory.Create();
        var adminId = Guid.NewGuid();
        var userId = Guid.NewGuid();

        var node = Node.Register(
            "node-1",
            new Uri("https://node1.example.com"),
            new NodeCredentials("admin", "protected"),
            null
        );
        var inbound = Inbound.FromRemote(node.Id, "1", VpnProtocol.Vless, "remark", 443);
        var config = VpnConfig.Create(userId, inbound.Id, VpnProtocol.Vless, null);
        config.AssignRemoteClient("ext-1");
        config.Suspend();

        dbContext.Nodes.Add(node);
        dbContext.Inbounds.Add(inbound);
        dbContext.VpnConfigs.Add(config);

        var ticket = SupportTicket.CreateExtensionRequest(userId, 5);
        dbContext.SupportTickets.Add(ticket);
        await dbContext.SaveChangesAsync(CancellationToken.None);

        _identityService
            .GetProfileAsync(userId, Arg.Any<CancellationToken>())
            .Returns(Profile(userId, paidUntil: null));
        _identityService
            .ExtendBillingPaidUntilAsync(userId, Arg.Any<DateTimeOffset>(), Arg.Any<CancellationToken>())
            .Returns(Result.Success());
        _gateway
            .UpdateClientAsync(
                Arg.Any<Node>(),
                Arg.Any<string>(),
                Arg.Any<string>(),
                Arg.Any<VpnProtocol>(),
                Arg.Any<string>(),
                enable: true,
                Arg.Any<CancellationToken>()
            )
            .Returns(Result.Success());

        var handler = CreateHandler(dbContext, adminId);

        var result = await handler.Handle(
            new ApproveExtensionRequestCommand(ticket.Id),
            CancellationToken.None
        );

        Assert.True(result.IsSuccess);
        Assert.Equal(ConfigStatus.Active, config.Status);
        Assert.NotNull(config.ExpiresAt);
    }

    [Fact]
    public async Task Handle_WhenTicketNotOpen_ReturnsNotOpen()
    {
        using var dbContext = InMemoryDbContextFactory.Create();
        var adminId = Guid.NewGuid();
        var userId = Guid.NewGuid();
        var ticket = SupportTicket.CreateExtensionRequest(userId, 5);
        ticket.Close();
        dbContext.SupportTickets.Add(ticket);
        await dbContext.SaveChangesAsync(CancellationToken.None);

        var handler = CreateHandler(dbContext, adminId);

        var result = await handler.Handle(
            new ApproveExtensionRequestCommand(ticket.Id),
            CancellationToken.None
        );

        Assert.False(result.IsSuccess);
        Assert.Equal(SupportErrors.NotOpen, result.Error);
    }

    [Fact]
    public async Task Handle_WhenNotExtensionRequest_ReturnsNotExtensionRequest()
    {
        using var dbContext = InMemoryDbContextFactory.Create();
        var adminId = Guid.NewGuid();
        var ticket = SupportTicket.CreateBugReport(Guid.NewGuid());
        dbContext.SupportTickets.Add(ticket);
        await dbContext.SaveChangesAsync(CancellationToken.None);

        var handler = CreateHandler(dbContext, adminId);

        var result = await handler.Handle(
            new ApproveExtensionRequestCommand(ticket.Id),
            CancellationToken.None
        );

        Assert.False(result.IsSuccess);
        Assert.Equal(SupportErrors.NotExtensionRequest, result.Error);
    }
}