using AutoMapper;
using GoodWood.Application.DTOs;
using GoodWood.Application.Interfaces;
using GoodWood.Application.Services;
using GoodWood.Domain.Entities;
using GoodWood.Domain.Enums;
using GoodWood.Domain.Interfaces;
using GoodWood.Infrastructure.Data;
using GoodWood.Tests.Common;
using Microsoft.EntityFrameworkCore;

namespace GoodWood.Tests.Integration;

/// <summary>
/// Integration tests for ClubService with in-memory database.
/// </summary>
public class ClubServiceIntegrationTests : IAsyncLifetime
{
    private AppDbContext _context = null!;
    private ClubService _sut = null!;
    private IMapper _mapper = null!;

    public Task InitializeAsync()
    {
        var options = new DbContextOptionsBuilder<AppDbContext>()
            .UseInMemoryDatabase($"TestDb_{Guid.NewGuid()}")
            .Options;

        _context = new AppDbContext(options);

        // Use TestMockHelpers for simple mapper
        _mapper = TestMockHelpers.CreateClubMapperMock().Object;

        var repository = new ClubRepository(_context);
        var gifServiceMock = new Mock<IClubGifService>();
        var bookingCategoryServiceMock = new Mock<IBookingCategoryService>();

        _sut = new ClubService(
            repository,
            _mapper,
            _context,
            gifServiceMock.Object,
            bookingCategoryServiceMock.Object);

        return Task.CompletedTask;
    }

    public async Task DisposeAsync()
    {
        await _context.DisposeAsync();
    }

    #region GetAllAsync Integration Tests

    [Fact]
    public async Task GetAllAsync_ReturnsEmptyList_WhenDatabaseEmpty()
    {
        // Act
        var result = await _sut.GetAllAsync();

        // Assert
        result.Should().BeEmpty();
    }

    [Fact]
    public async Task GetAllAsync_ReturnsAllClubs_FromDatabase()
    {
        // Arrange
        var clubs = new[]
        {
            TestDataGenerator.CreateClub(name: "Club A"),
            TestDataGenerator.CreateClub(name: "Club B"),
            TestDataGenerator.CreateClub(name: "Club C")
        };

        await _context.Clubs.AddRangeAsync(clubs);
        await _context.SaveChangesAsync();

        // Act
        var result = await _sut.GetAllAsync();

        // Assert
        result.Should().HaveCount(3);
        result.Select(c => c.Name).Should().Contain(new[] { "Club A", "Club B", "Club C" });
    }

    [Fact]
    public async Task GetAllAsync_ExcludesDeletedClubs()
    {
        // Arrange
        var activeClub = TestDataGenerator.CreateClub(name: "Active Club");
        var deletedClub = TestDataGenerator.CreateClub(name: "Deleted Club", isDeleted: true);

        await _context.Clubs.AddRangeAsync(activeClub, deletedClub);
        await _context.SaveChangesAsync();

        // Act
        var result = await _sut.GetAllAsync();

        // Assert
        result.Should().ContainSingle();
        result.First().Name.Should().Be("Active Club");
    }

    #endregion

    #region GetByIdAsync Integration Tests

    [Fact]
    public async Task GetByIdAsync_ReturnsClub_WhenExists()
    {
        // Arrange
        var club = TestDataGenerator.CreateClub(name: "Test Club");
        await _context.Clubs.AddAsync(club);
        await _context.SaveChangesAsync();

        // Act
        var result = await _sut.GetByIdAsync(club.Id);

        // Assert
        result.Should().NotBeNull();
        result!.Id.Should().Be(club.Id);
        result.Name.Should().Be("Test Club");
    }

    [Fact]
    public async Task GetByIdAsync_ReturnsNull_WhenNotExists()
    {
        // Arrange
        var nonExistentId = Guid.NewGuid();

        // Act
        var result = await _sut.GetByIdAsync(nonExistentId);

        // Assert
        result.Should().BeNull();
    }

    [Fact]
    public async Task GetByIdAsync_ReturnsNull_WhenDeleted()
    {
        // Arrange
        var deletedClub = TestDataGenerator.CreateClub(isDeleted: true);
        await _context.Clubs.AddAsync(deletedClub);
        await _context.SaveChangesAsync();

        // Act
        var result = await _sut.GetByIdAsync(deletedClub.Id);

        // Assert
        result.Should().BeNull();
    }

    #endregion

    #region CreateAsync Integration Tests

    [Fact]
    public async Task CreateAsync_PersistsClubToDatabase()
    {
        // Arrange
        var dto = TestDataGenerator.CreateCreateClubDto(
            name: "New Kegelclub",
            expenseCalculation: ExpenseCalculation.Average);

        // Act
        var result = await _sut.CreateAsync(dto);

        // Assert
        result.Should().NotBeNull();
        result.Name.Should().Be("New Kegelclub");
        result.ExpenseCalculation.Should().Be(ExpenseCalculation.Average);

        // Verify in database
        var dbClub = await _context.Clubs.FindAsync(result.Id);
        dbClub.Should().NotBeNull();
        dbClub!.Name.Should().Be("New Kegelclub");
    }

    [Fact]
    public async Task CreateAsync_GeneratesUniqueIds()
    {
        // Arrange
        var dto1 = TestDataGenerator.CreateCreateClubDto(name: "Club 1");
        var dto2 = TestDataGenerator.CreateCreateClubDto(name: "Club 2");

        // Act
        var result1 = await _sut.CreateAsync(dto1);
        var result2 = await _sut.CreateAsync(dto2);

        // Assert
        result1.Id.Should().NotBe(result2.Id);
        result1.Id.Should().NotBe(Guid.Empty);
        result2.Id.Should().NotBe(Guid.Empty);
    }

    [Theory]
    [InlineData(ExpenseCalculation.None)]
    [InlineData(ExpenseCalculation.Average)]
    [InlineData(ExpenseCalculation.Maximum)]
    public async Task CreateAsync_HandlesAllExpenseCalculationTypes(ExpenseCalculation calculation)
    {
        // Arrange
        var dto = TestDataGenerator.CreateCreateClubDto(expenseCalculation: calculation);

        // Act
        var result = await _sut.CreateAsync(dto);

        // Assert
        result.ExpenseCalculation.Should().Be(calculation);

        var dbClub = await _context.Clubs.FindAsync(result.Id);
        dbClub!.ExpenseCalculation.Should().Be(calculation);
    }

    #endregion

    #region UpdateAsync Integration Tests

    [Fact]
    public async Task UpdateAsync_UpdatesClubInDatabase()
    {
        // Arrange
        var club = TestDataGenerator.CreateClub(
            name: "Original Name",
            expenseCalculation: ExpenseCalculation.None);
        await _context.Clubs.AddAsync(club);
        await _context.SaveChangesAsync();

        var updateDto = new UpdateClubDto
        {
            Id = club.Id,
            Name = "Updated Name",
            ExpenseCalculation = ExpenseCalculation.Maximum
        };

        // Act
        var result = await _sut.UpdateAsync(updateDto);

        // Assert
        result.Name.Should().Be("Updated Name");
        result.ExpenseCalculation.Should().Be(ExpenseCalculation.Maximum);

        // Verify in database
        _context.ChangeTracker.Clear();
        var dbClub = await _context.Clubs.FindAsync(club.Id);
        dbClub!.Name.Should().Be("Updated Name");
        dbClub.ExpenseCalculation.Should().Be(ExpenseCalculation.Maximum);
    }

    [Fact]
    public async Task UpdateAsync_SetsModifiedAt()
    {
        // Arrange
        var club = TestDataGenerator.CreateClub();
        club.ModifiedAt = null;
        await _context.Clubs.AddAsync(club);
        await _context.SaveChangesAsync();

        var updateDto = TestDataGenerator.CreateUpdateClubDto(id: club.Id);
        var beforeUpdate = DateTime.UtcNow;

        // Act
        await _sut.UpdateAsync(updateDto);

        // Assert
        _context.ChangeTracker.Clear();
        var dbClub = await _context.Clubs.FindAsync(club.Id);
        dbClub!.ModifiedAt.Should().NotBeNull();
        dbClub.ModifiedAt.Should().BeOnOrAfter(beforeUpdate);
    }

    [Fact]
    public async Task UpdateAsync_ThrowsException_WhenClubNotFound()
    {
        // Arrange
        var updateDto = TestDataGenerator.CreateUpdateClubDto(id: Guid.NewGuid());

        // Act
        var act = () => _sut.UpdateAsync(updateDto);

        // Assert
        await act.Should().ThrowAsync<InvalidOperationException>();
    }

    #endregion

    #region DeleteAsync Integration Tests

    [Fact]
    public async Task DeleteAsync_SoftDeletesClub()
    {
        var useQueryFilter = true;
        // Arrange
        var club = TestDataGenerator.CreateClub();
        await _context.Clubs.AddAsync(club);
        await _context.SaveChangesAsync();

        // Act
        var result = await _sut.DeleteAsync(club.Id);

        // Assert
        result.Should().BeTrue();

        _context.ChangeTracker.Clear();
        var dbClub = await _context.Clubs.FindAsync(club.Id);

        if (!useQueryFilter)
        {
            dbClub!.IsDeleted.Should().BeTrue();
        }
        else
        {
            dbClub.Should().BeNull();
        }
    }

    [Fact]
    public async Task DeleteAsync_ReturnsFalse_WhenClubNotFound()
    {
        // Arrange
        var nonExistentId = Guid.NewGuid();

        // Act
        var result = await _sut.DeleteAsync(nonExistentId);

        // Assert
        result.Should().BeFalse();
    }

    [Fact]
    public async Task DeleteAsync_MakesClubInvisibleToGetAll()
    {
        // Arrange
        var club = TestDataGenerator.CreateClub();
        await _context.Clubs.AddAsync(club);
        await _context.SaveChangesAsync();

        // Act
        await _sut.DeleteAsync(club.Id);
        var allClubs = await _sut.GetAllAsync();

        // Assert
        allClubs.Should().NotContain(c => c.Id == club.Id);
    }

    #endregion

    #region Concurrent Operations Tests

    [Fact]
    public async Task ConcurrentCreates_AllSucceed()
    {
        // Arrange
        var tasks = Enumerable.Range(0, 10)
            .Select(i => TestDataGenerator.CreateCreateClubDto(name: $"Club {i}"))
            .Select(dto => _sut.CreateAsync(dto))
            .ToList();

        // Act
        var results = await Task.WhenAll(tasks);

        // Assert
        results.Should().HaveCount(10);
        results.Select(r => r.Id).Should().OnlyHaveUniqueItems();
    }

    #endregion
}

/// <summary>
/// Simple in-memory ClubRepository for integration testing.
/// </summary>
internal class ClubRepository : GoodWood.Domain.Interfaces.IClubRepository
{
    private readonly AppDbContext _context;

    public ClubRepository(AppDbContext context)
    {
        _context = context;
    }

    public async Task<List<Club>> GetAllAsync(CancellationToken ct = default)
    {
        return await _context.Clubs
            .Where(c => !c.IsDeleted)
            .ToListAsync(ct);
    }

    public async Task<Club?> GetByIdAsync(Guid id, CancellationToken ct = default)
    {
        return await _context.Clubs
            .Where(c => c.Id == id && !c.IsDeleted)
            .FirstOrDefaultAsync(ct);
    }

    public async Task<Club> AddAsync(Club entity, CancellationToken ct = default)
    {
        await _context.Clubs.AddAsync(entity, ct);
        await _context.SaveChangesAsync(ct);
        return entity;
    }

    public async Task<Club> UpdateAsync(Club entity, CancellationToken ct = default)
    {
        _context.Clubs.Update(entity);
        await _context.SaveChangesAsync(ct);
        return entity;
    }

    public async Task<bool> DeleteAsync(Guid id, CancellationToken ct = default)
    {
        var club = await _context.Clubs.FindAsync([id], ct);
        if (club == null) return false;

        club.IsDeleted = true;
        club.ModifiedAt = DateTime.UtcNow;
        await _context.SaveChangesAsync(ct);
        return true;
    }

    public async Task<Club?> GetByNameAsync(string clubName, Guid? excludeGuid, CancellationToken ct = default)
    {
        var query = _context.Clubs
            .Where(c => !c.IsDeleted && c.Name.ToLower() == clubName.ToLower());
        if (excludeGuid.HasValue)
        {
            query = query.Where(c => c.Id != excludeGuid.Value);
        }
        return await query.FirstOrDefaultAsync(ct);
    }

    public async Task<Club?> GetByLoginNameAsync(string clubLoginName, Guid? excludeGuid, CancellationToken ct = default)
    {
        var query = _context.Clubs
            .Where(c => !c.IsDeleted && c.LoginName.ToLower() == clubLoginName.ToLower());
        if (excludeGuid.HasValue)
        {
            query = query.Where(c => c.Id != excludeGuid.Value);
        }
        return await query.FirstOrDefaultAsync(ct);
    }
}