using NSubstitute;
using PnvPanel.Application.Admin.Roles;
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.Support;
using Xunit;

namespace PnvPanel.Application.Tests.Admin.Support;

public class ApproveRoleRequestCommandHandlerTests
{
    private readonly IRoleService _roleService = Substitute.For<IRoleService>();
    private readonly IRealtimeNotifier _notifier = Substitute.For<IRealtimeNotifier>();
    private readonly ITelegramNotifier _telegramNotifier = Substitute.For<ITelegramNotifier>();

    [Fact]
    public async Task Handle_ForNewRoleRequest_CreatesRoleAssignsAndResolves()
    {
        using var dbContext = InMemoryDbContextFactory.Create();
        var userId = Guid.NewGuid();
        var ticket = SupportTicket.CreateRoleRequestForNewRole(userId, "premium", 10, 5);
        dbContext.SupportTickets.Add(ticket);
        await dbContext.SaveChangesAsync(CancellationToken.None);

        var newRoleId = Guid.NewGuid();
        _roleService
            .CreateRoleAsync("premium", 10, 5, null, null, Arg.Any<CancellationToken>())
            .Returns(Result.Success(new RoleDto(newRoleId, "premium", 10, 5, false)));
        _roleService
            .ChangeUserRoleAsync(userId, newRoleId, Arg.Any<CancellationToken>())
            .Returns(Result.Success());

        var currentUser = FakeCurrentUser.Authenticated(Guid.NewGuid(), "admin");
        var handler = new ApproveRoleRequestCommandHandler(
            dbContext,
            _roleService,
            _notifier,
            _telegramNotifier,
            currentUser
        );

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

        Assert.True(result.IsSuccess);
        Assert.Equal(TicketStatus.Resolved, ticket.Status);
        await _roleService
            .Received(1)
            .CreateRoleAsync("premium", 10, 5, null, null, Arg.Any<CancellationToken>());
        await _roleService
            .Received(1)
            .ChangeUserRoleAsync(userId, newRoleId, Arg.Any<CancellationToken>());
        await _telegramNotifier
            .Received(1)
            .NotifyUserAsync(
                userId,
                Arg.Any<string>(),
                Arg.Any<string?>(),
                Arg.Any<CancellationToken>()
            );
    }

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

        _roleService
            .ChangeUserRoleAsync(userId, roleId, Arg.Any<CancellationToken>())
            .Returns(Result.Success());

        var currentUser = FakeCurrentUser.Authenticated(Guid.NewGuid());
        var handler = new ApproveRoleRequestCommandHandler(
            dbContext,
            _roleService,
            _notifier,
            _telegramNotifier,
            currentUser
        );

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

        Assert.True(result.IsSuccess);
        await _roleService
            .DidNotReceive()
            .CreateRoleAsync(
                Arg.Any<string>(),
                Arg.Any<int>(),
                Arg.Any<int>(),
                Arg.Any<int?>(),
                Arg.Any<int?>(),
                Arg.Any<CancellationToken>()
            );
    }

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

        var currentUser = FakeCurrentUser.Authenticated(Guid.NewGuid());
        var handler = new ApproveRoleRequestCommandHandler(
            dbContext,
            _roleService,
            _notifier,
            _telegramNotifier,
            currentUser
        );

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

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

    [Fact]
    public async Task Handle_WhenTicketIsOwnedByAdmin_StillApproves()
    {
        // Одобрить свою же заявку можно — единственный реальный риск (снять admin с последнего
        // администратора) ловит RoleService.ChangeUserRoleAsync, а не этот хендлер (см. соседний тест).
        using var dbContext = InMemoryDbContextFactory.Create();
        var adminId = Guid.NewGuid();
        var roleId = Guid.NewGuid();
        var ticket = SupportTicket.CreateRoleRequestForExistingRole(adminId, roleId);
        dbContext.SupportTickets.Add(ticket);
        await dbContext.SaveChangesAsync(CancellationToken.None);

        _roleService
            .ChangeUserRoleAsync(adminId, roleId, Arg.Any<CancellationToken>())
            .Returns(Result.Success());

        var currentUser = FakeCurrentUser.Authenticated(adminId, "admin");
        var handler = new ApproveRoleRequestCommandHandler(
            dbContext,
            _roleService,
            _notifier,
            _telegramNotifier,
            currentUser
        );

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

        Assert.True(result.IsSuccess);
        Assert.Equal(TicketStatus.Resolved, ticket.Status);
    }

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

        _roleService
            .ChangeUserRoleAsync(adminId, roleId, Arg.Any<CancellationToken>())
            .Returns(Result.Failure(RoleErrors.CannotRemoveLastAdmin));

        var currentUser = FakeCurrentUser.Authenticated(adminId, "admin");
        var handler = new ApproveRoleRequestCommandHandler(
            dbContext,
            _roleService,
            _notifier,
            _telegramNotifier,
            currentUser
        );

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

        Assert.False(result.IsSuccess);
        Assert.Equal(RoleErrors.CannotRemoveLastAdmin, result.Error);
        // Тикет остаётся Open — можно повторить попытку после назначения второго админа.
        Assert.Equal(TicketStatus.Open, ticket.Status);
    }
}