using AutoMapper;
using Koogle.Application.DTOs;
using Koogle.Application.Services;
using Koogle.Domain.Entities;
using Koogle.Domain.Enums;
using Koogle.Domain.Interfaces;
using Moq;
using FluentAssertions;
using Koogle.Application.Interfaces;

namespace Koogle.Tests.Unit.Services;

/// <summary>
/// Unit tests for BookingCategoryService.
/// </summary>
public class BookingCategoryServiceTests
{
    private readonly Mock<IBookingCategoryRepository> _repositoryMock;
    private readonly Mock<ICurrentClubContext> _clubContextMock;
    private readonly Mock<IMapper> _mapperMock;
    private readonly BookingCategoryService _sut;
    private readonly Guid _clubId = Guid.NewGuid();

    public BookingCategoryServiceTests()
    {
        _repositoryMock = new Mock<IBookingCategoryRepository>();
        _clubContextMock = new Mock<ICurrentClubContext>();
        _mapperMock = new Mock<IMapper>();

        _clubContextMock.Setup(c => c.ClubId).Returns(_clubId);

        SetupMapper();

        _sut = new BookingCategoryService(
            _repositoryMock.Object,
            _clubContextMock.Object,
            _mapperMock.Object);
    }

    private void SetupMapper()
    {
        _mapperMock.Setup(m => m.Map<BookingCategoryDto>(It.IsAny<BookingCategory>()))
            .Returns((BookingCategory c) => new BookingCategoryDto
            {
                Id = c.Id,
                Name = c.Name,
                Description = c.Description,
                CategoryType = c.CategoryType,
                IsSystemCategory = c.IsSystemCategory,
                Color = c.Color,
                Icon = c.Icon,
                IsActive = c.IsActive
            });

        _mapperMock.Setup(m => m.Map<List<BookingCategoryDto>>(It.IsAny<List<BookingCategory>>()))
            .Returns((List<BookingCategory> cats) => cats.Select(c => new BookingCategoryDto
            {
                Id = c.Id,
                Name = c.Name,
                Description = c.Description,
                CategoryType = c.CategoryType,
                IsSystemCategory = c.IsSystemCategory,
                Color = c.Color,
                Icon = c.Icon,
                IsActive = c.IsActive
            }).ToList());
    }

    #region GetAllAsync Tests

    [Fact]
    public async Task GetAllAsync_ReturnsEmptyList_WhenNoCategoriesExist()
    {
        // Arrange
        _repositoryMock.Setup(r => r.GetByClubIdAsync(_clubId, false, It.IsAny<CancellationToken>()))
            .ReturnsAsync([]);

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

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

    [Fact]
    public async Task GetAllAsync_ReturnsAllCategories_WhenCategoriesExist()
    {
        // Arrange
        var categories = new List<BookingCategory>
        {
            CreateCategory("Spielstrafe"),
            CreateCategory("Mitgliedsbeitrag"),
            CreateCategory("Sonstige Einnahmen")
        };
        _repositoryMock.Setup(r => r.GetByClubIdAsync(_clubId, false, It.IsAny<CancellationToken>()))
            .ReturnsAsync(categories);

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

        // Assert
        result.Should().HaveCount(3);
    }

    [Fact]
    public async Task GetAllAsync_IncludesInactive_WhenRequested()
    {
        // Arrange
        _repositoryMock.Setup(r => r.GetByClubIdAsync(_clubId, true, It.IsAny<CancellationToken>()))
            .ReturnsAsync([]);

        // Act
        await _sut.GetAllAsync(includeInactive: true);

        // Assert
        _repositoryMock.Verify(r => r.GetByClubIdAsync(_clubId, true, It.IsAny<CancellationToken>()), Times.Once);
    }

    #endregion

    #region GetByIdAsync Tests

    [Fact]
    public async Task GetByIdAsync_ReturnsNull_WhenCategoryNotFound()
    {
        // Arrange
        var id = Guid.NewGuid();
        _repositoryMock.Setup(r => r.GetByIdAsync(id, It.IsAny<CancellationToken>()))
            .ReturnsAsync((BookingCategory?)null);

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

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

    [Fact]
    public async Task GetByIdAsync_ReturnsNull_WhenCategoryBelongsToDifferentClub()
    {
        // Arrange
        var category = CreateCategory("Test", clubId: Guid.NewGuid());
        _repositoryMock.Setup(r => r.GetByIdAsync(category.Id, It.IsAny<CancellationToken>()))
            .ReturnsAsync(category);

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

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

    [Fact]
    public async Task GetByIdAsync_ReturnsCategory_WhenExists()
    {
        // Arrange
        var category = CreateCategory("Test");
        _repositoryMock.Setup(r => r.GetByIdAsync(category.Id, It.IsAny<CancellationToken>()))
            .ReturnsAsync(category);

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

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

    #endregion

    #region CreateAsync Tests

    [Fact]
    public async Task CreateAsync_CreatesCategory_WithCorrectData()
    {
        // Arrange
        var dto = new CreateBookingCategoryDto
        {
            Name = "Neue Kategorie",
            Description = "Beschreibung",
            CategoryType = BookingCategoryType.Income,
            Color = "#FF0000",
            Icon = "Star"
        };
        BookingCategory? captured = null;
        _repositoryMock.Setup(r => r.AddAsync(It.IsAny<BookingCategory>(), It.IsAny<CancellationToken>()))
            .Callback<BookingCategory, CancellationToken>((c, _) => captured = c)
            .ReturnsAsync((BookingCategory c, CancellationToken _) => c);

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

        // Assert
        captured.Should().NotBeNull();
        captured!.Name.Should().Be("Neue Kategorie");
        captured.ClubId.Should().Be(_clubId);
        captured.IsSystemCategory.Should().BeFalse();
        captured.IsActive.Should().BeTrue();
    }

    [Fact]
    public async Task CreateAsync_SetsCreatedAt()
    {
        // Arrange
        var dto = new CreateBookingCategoryDto
        {
            Name = "Test",
            CategoryType = BookingCategoryType.Expense
        };
        var beforeCreate = DateTime.UtcNow;
        BookingCategory? captured = null;
        _repositoryMock.Setup(r => r.AddAsync(It.IsAny<BookingCategory>(), It.IsAny<CancellationToken>()))
            .Callback<BookingCategory, CancellationToken>((c, _) => captured = c)
            .ReturnsAsync((BookingCategory c, CancellationToken _) => c);

        // Act
        await _sut.CreateAsync(dto);
        var afterCreate = DateTime.UtcNow;

        // Assert
        captured!.CreatedAt.Should().BeOnOrAfter(beforeCreate);
        captured.CreatedAt.Should().BeOnOrBefore(afterCreate);
    }

    #endregion

    #region UpdateAsync Tests

    [Fact]
    public async Task UpdateAsync_ThrowsException_WhenCategoryNotFound()
    {
        // Arrange
        var dto = new UpdateBookingCategoryDto
        {
            Id = Guid.NewGuid(),
            Name = "Updated",
            IsActive = true
        };
        _repositoryMock.Setup(r => r.GetByIdAsync(dto.Id, It.IsAny<CancellationToken>()))
            .ReturnsAsync((BookingCategory?)null);

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

        // Assert
        await act.Should().ThrowAsync<InvalidOperationException>()
            .WithMessage($"Category with id {dto.Id} not found.");
    }

    [Fact]
    public async Task UpdateAsync_ThrowsException_WhenCategoryBelongsToDifferentClub()
    {
        // Arrange
        var category = CreateCategory("Test", clubId: Guid.NewGuid());
        var dto = new UpdateBookingCategoryDto
        {
            Id = category.Id,
            Name = "Updated",
            IsActive = true
        };
        _repositoryMock.Setup(r => r.GetByIdAsync(category.Id, It.IsAny<CancellationToken>()))
            .ReturnsAsync(category);

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

        // Assert
        await act.Should().ThrowAsync<InvalidOperationException>()
            .WithMessage("Category does not belong to current club.");
    }

    [Fact]
    public async Task UpdateAsync_UpdatesCategory_Correctly()
    {
        // Arrange
        var category = CreateCategory("Original");
        var dto = new UpdateBookingCategoryDto
        {
            Id = category.Id,
            Name = "Updated",
            Description = "New Desc",
            Color = "#00FF00",
            Icon = "Edit",
            IsActive = false
        };
        _repositoryMock.Setup(r => r.GetByIdAsync(category.Id, It.IsAny<CancellationToken>()))
            .ReturnsAsync(category);
        _repositoryMock.Setup(r => r.UpdateAsync(It.IsAny<BookingCategory>(), It.IsAny<CancellationToken>()))
            .ReturnsAsync((BookingCategory c, CancellationToken _) => c);

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

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

    #endregion

    #region DeleteAsync Tests

    [Fact]
    public async Task DeleteAsync_ReturnsFalse_WhenCategoryNotFound()
    {
        // Arrange
        var id = Guid.NewGuid();
        _repositoryMock.Setup(r => r.GetByIdAsync(id, It.IsAny<CancellationToken>()))
            .ReturnsAsync((BookingCategory?)null);

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

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

    [Fact]
    public async Task DeleteAsync_ThrowsException_WhenSystemCategory()
    {
        // Arrange
        var category = CreateCategory("Spielstrafe", isSystem: true);
        _repositoryMock.Setup(r => r.GetByIdAsync(category.Id, It.IsAny<CancellationToken>()))
            .ReturnsAsync(category);

        // Act
        var act = () => _sut.DeleteAsync(category.Id);

        // Assert
        await act.Should().ThrowAsync<InvalidOperationException>()
            .WithMessage("System categories cannot be deleted.");
    }

    [Fact]
    public async Task DeleteAsync_SoftDeletes_WhenNonSystemCategory()
    {
        // Arrange
        var category = CreateCategory("Custom", isSystem: false);
        _repositoryMock.Setup(r => r.GetByIdAsync(category.Id, It.IsAny<CancellationToken>()))
            .ReturnsAsync(category);
        _repositoryMock.Setup(r => r.UpdateAsync(It.IsAny<BookingCategory>(), It.IsAny<CancellationToken>()))
            .ReturnsAsync((BookingCategory c, CancellationToken _) => c);

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

        // Assert
        result.Should().BeTrue();
        category.IsDeleted.Should().BeTrue();
    }

    #endregion

    #region EnsureSystemCategoriesAsync Tests

    [Fact]
    public async Task EnsureSystemCategoriesAsync_CreatesAllSystemCategories_WhenNoneExist()
    {
        // Arrange
        _repositoryMock.Setup(r => r.GetSystemCategoryAsync(_clubId, It.IsAny<string>(), It.IsAny<CancellationToken>()))
            .ReturnsAsync((BookingCategory?)null);
        _repositoryMock.Setup(r => r.AddAsync(It.IsAny<BookingCategory>(), It.IsAny<CancellationToken>()))
            .ReturnsAsync((BookingCategory c, CancellationToken _) => c);

        // Act
        await _sut.EnsureSystemCategoriesAsync();

        // Assert
        _repositoryMock.Verify(r => r.AddAsync(It.IsAny<BookingCategory>(), It.IsAny<CancellationToken>()), Times.Exactly(4));
    }

    [Fact]
    public async Task EnsureSystemCategoriesAsync_SkipsExisting_Categories()
    {
        // Arrange
        var existing = CreateCategory("Spielstrafe", isSystem: true);
        _repositoryMock.Setup(r => r.GetSystemCategoryAsync(_clubId, "Spielstrafe", It.IsAny<CancellationToken>()))
            .ReturnsAsync(existing);
        _repositoryMock.Setup(r => r.GetSystemCategoryAsync(_clubId, It.Is<string>(s => s != "Spielstrafe"), It.IsAny<CancellationToken>()))
            .ReturnsAsync((BookingCategory?)null);
        _repositoryMock.Setup(r => r.AddAsync(It.IsAny<BookingCategory>(), It.IsAny<CancellationToken>()))
            .ReturnsAsync((BookingCategory c, CancellationToken _) => c);

        // Act
        await _sut.EnsureSystemCategoriesAsync();

        // Assert
        _repositoryMock.Verify(r => r.AddAsync(It.IsAny<BookingCategory>(), It.IsAny<CancellationToken>()), Times.Exactly(3));
    }

    #endregion

    #region Helper Methods

    private BookingCategory CreateCategory(
        string name,
        Guid? clubId = null,
        bool isSystem = false,
        BookingCategoryType type = BookingCategoryType.Income)
    {
        return new BookingCategory
        {
            Id = Guid.NewGuid(),
            ClubId = clubId ?? _clubId,
            Name = name,
            CategoryType = type,
            IsSystemCategory = isSystem,
            IsActive = true,
            CreatedAt = DateTime.UtcNow
        };
    }

    #endregion
}