using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Logging;
using MiAssessment.Admin.Business.Data;
using MiAssessment.Admin.Business.Entities;
using MiAssessment.Admin.Business.Models;
using MiAssessment.Admin.Business.Models.BusinessPage;
using MiAssessment.Admin.Business.Models.Common;
using MiAssessment.Admin.Business.Services;
using Moq;
using Xunit;

namespace MiAssessment.Tests.Admin;

/// <summary>
/// 业务介绍页服务单元测试
/// 验证业务介绍页服务的边界条件和错误处理
/// </summary>
public class BusinessPageServiceTests
{
    private readonly Mock<ILogger<BusinessPageService>> _mockLogger = new();

    #region 测试页面不存在返回错误 (Requirements 7.4, 8.3)

    /// <summary>
    /// 测试 GetPageByIdAsync 当页面 ID 不存在时返回 null
    /// **Validates: Requirements 7.4**
    /// </summary>
    [Fact]
    public async Task GetPageByIdAsync_WhenPageNotExists_ReturnsNull()
    {
        // Arrange
        using var dbContext = CreateDbContext();
        var service = new BusinessPageService(dbContext, _mockLogger.Object);
        var nonExistentId = 99999L;

        // Act
        var result = await service.GetPageByIdAsync(nonExistentId);

        // Assert
        Assert.Null(result);
    }

    /// <summary>
    /// 测试 UpdatePageAsync 当页面 ID 不存在时抛出 BusinessException
    /// **Validates: Requirements 7.4**
    /// </summary>
    [Fact]
    public async Task UpdatePageAsync_WhenPageNotExists_ThrowsBusinessException()
    {
        // Arrange
        using var dbContext = CreateDbContext();
        var service = new BusinessPageService(dbContext, _mockLogger.Object);
        var request = new UpdateBusinessPageRequest
        {
            Id = 99999L,
            Title = "测试标题",
            ImageUrl = "https://example.com/image.jpg",
            HasActionButton = false,
            Sort = 0,
            Status = 1
        };

        // Act & Assert
        var exception = await Assert.ThrowsAsync<BusinessException>(
            () => service.UpdatePageAsync(request));

        Assert.Equal(ErrorCodes.BusinessPageNotFound, exception.Code);
        Assert.Equal("业务介绍页不存在", exception.Message);
    }

    /// <summary>
    /// 测试 DeletePageAsync 当页面 ID 不存在时抛出 BusinessException
    /// **Validates: Requirements 8.3**
    /// </summary>
    [Fact]
    public async Task DeletePageAsync_WhenPageNotExists_ThrowsBusinessException()
    {
        // Arrange
        using var dbContext = CreateDbContext();
        var service = new BusinessPageService(dbContext, _mockLogger.Object);
        var nonExistentId = 99999L;

        // Act & Assert
        var exception = await Assert.ThrowsAsync<BusinessException>(
            () => service.DeletePageAsync(nonExistentId));

        Assert.Equal(ErrorCodes.BusinessPageNotFound, exception.Code);
        Assert.Equal("业务介绍页不存在", exception.Message);
    }

    /// <summary>
    /// 测试 UpdatePageStatusAsync 当页面 ID 不存在时抛出 BusinessException
    /// **Validates: Requirements 8.3**
    /// </summary>
    [Fact]
    public async Task UpdatePageStatusAsync_WhenPageNotExists_ThrowsBusinessException()
    {
        // Arrange
        using var dbContext = CreateDbContext();
        var service = new BusinessPageService(dbContext, _mockLogger.Object);
        var nonExistentId = 99999L;

        // Act & Assert
        var exception = await Assert.ThrowsAsync<BusinessException>(
            () => service.UpdatePageStatusAsync(nonExistentId, 1));

        Assert.Equal(ErrorCodes.BusinessPageNotFound, exception.Code);
        Assert.Equal("业务介绍页不存在", exception.Message);
    }

    /// <summary>
    /// 测试 UpdatePageSortAsync 当页面 ID 不存在时抛出 BusinessException
    /// **Validates: Requirements 8.3**
    /// </summary>
    [Fact]
    public async Task UpdatePageSortAsync_WhenPageNotExists_ThrowsBusinessException()
    {
        // Arrange
        using var dbContext = CreateDbContext();
        var service = new BusinessPageService(dbContext, _mockLogger.Object);
        var nonExistentId = 99999L;

        // Act & Assert
        var exception = await Assert.ThrowsAsync<BusinessException>(
            () => service.UpdatePageSortAsync(nonExistentId, 100));

        Assert.Equal(ErrorCodes.BusinessPageNotFound, exception.Code);
        Assert.Equal("业务介绍页不存在", exception.Message);
    }

    #endregion

    #region 测试软删除后不出现在列表中 (Requirements 8.1)

    /// <summary>
    /// 测试 GetPageListAsync 软删除后页面不出现在列表中
    /// **Validates: Requirements 8.1**
    /// </summary>
    [Fact]
    public async Task GetPageListAsync_AfterSoftDelete_PageNotInList()
    {
        // Arrange
        using var dbContext = CreateDbContext();
        
        // 创建一个业务介绍页
        var page = await CreateTestBusinessPage(dbContext, 1);
        var pageId = page.Id;
        
        var service = new BusinessPageService(dbContext, _mockLogger.Object);
        
        // 验证页面在列表中
        var listBeforeDelete = await service.GetPageListAsync(new BusinessPageQueryRequest { Page = 1, PageSize = 10 });
        Assert.Single(listBeforeDelete.List);
        Assert.Equal(pageId, listBeforeDelete.List[0].Id);

        // Act - 执行软删除
        await service.DeletePageAsync(pageId);

        // Assert - 验证页面不在列表中
        var listAfterDelete = await service.GetPageListAsync(new BusinessPageQueryRequest { Page = 1, PageSize = 10 });
        Assert.Empty(listAfterDelete.List);
    }

    /// <summary>
    /// 测试 GetPageByIdAsync 软删除后页面返回 null
    /// **Validates: Requirements 8.1**
    /// </summary>
    [Fact]
    public async Task GetPageByIdAsync_AfterSoftDelete_ReturnsNull()
    {
        // Arrange
        using var dbContext = CreateDbContext();
        
        // 创建一个业务介绍页
        var page = await CreateTestBusinessPage(dbContext, 1);
        var pageId = page.Id;
        
        var service = new BusinessPageService(dbContext, _mockLogger.Object);
        
        // 验证页面存在
        var pageBeforeDelete = await service.GetPageByIdAsync(pageId);
        Assert.NotNull(pageBeforeDelete);

        // Act - 执行软删除
        await service.DeletePageAsync(pageId);

        // Assert - 验证页面返回 null
        var pageAfterDelete = await service.GetPageByIdAsync(pageId);
        Assert.Null(pageAfterDelete);
    }

    /// <summary>
    /// 测试 UpdatePageAsync 软删除后更新页面抛出 BusinessException
    /// **Validates: Requirements 8.1, 7.4**
    /// </summary>
    [Fact]
    public async Task UpdatePageAsync_AfterSoftDelete_ThrowsBusinessException()
    {
        // Arrange
        using var dbContext = CreateDbContext();
        
        // 创建一个业务介绍页
        var page = await CreateTestBusinessPage(dbContext, 1);
        var pageId = page.Id;
        
        var service = new BusinessPageService(dbContext, _mockLogger.Object);
        
        // 执行软删除
        await service.DeletePageAsync(pageId);

        // Act & Assert - 尝试更新已软删除的页面
        var request = new UpdateBusinessPageRequest
        {
            Id = pageId,
            Title = "更新后的标题",
            ImageUrl = "https://example.com/new-image.jpg",
            HasActionButton = false,
            Sort = 0,
            Status = 1
        };

        var exception = await Assert.ThrowsAsync<BusinessException>(
            () => service.UpdatePageAsync(request));

        Assert.Equal(ErrorCodes.BusinessPageNotFound, exception.Code);
        Assert.Equal("业务介绍页不存在", exception.Message);
    }

    /// <summary>
    /// 测试 DeletePageAsync 软删除后再次删除抛出 BusinessException
    /// **Validates: Requirements 8.1, 8.3**
    /// </summary>
    [Fact]
    public async Task DeletePageAsync_AfterSoftDelete_ThrowsBusinessException()
    {
        // Arrange
        using var dbContext = CreateDbContext();
        
        // 创建一个业务介绍页
        var page = await CreateTestBusinessPage(dbContext, 1);
        var pageId = page.Id;
        
        var service = new BusinessPageService(dbContext, _mockLogger.Object);
        
        // 执行软删除
        await service.DeletePageAsync(pageId);

        // Act & Assert - 尝试再次删除已软删除的页面
        var exception = await Assert.ThrowsAsync<BusinessException>(
            () => service.DeletePageAsync(pageId));

        Assert.Equal(ErrorCodes.BusinessPageNotFound, exception.Code);
        Assert.Equal("业务介绍页不存在", exception.Message);
    }

    /// <summary>
    /// 测试 UpdatePageStatusAsync 软删除后更新状态抛出 BusinessException
    /// **Validates: Requirements 8.1, 8.3**
    /// </summary>
    [Fact]
    public async Task UpdatePageStatusAsync_AfterSoftDelete_ThrowsBusinessException()
    {
        // Arrange
        using var dbContext = CreateDbContext();
        
        // 创建一个业务介绍页
        var page = await CreateTestBusinessPage(dbContext, 1);
        var pageId = page.Id;
        
        var service = new BusinessPageService(dbContext, _mockLogger.Object);
        
        // 执行软删除
        await service.DeletePageAsync(pageId);

        // Act & Assert - 尝试更新已软删除页面的状态
        var exception = await Assert.ThrowsAsync<BusinessException>(
            () => service.UpdatePageStatusAsync(pageId, 0));

        Assert.Equal(ErrorCodes.BusinessPageNotFound, exception.Code);
        Assert.Equal("业务介绍页不存在", exception.Message);
    }

    /// <summary>
    /// 测试 UpdatePageSortAsync 软删除后更新排序抛出 BusinessException
    /// **Validates: Requirements 8.1, 8.3**
    /// </summary>
    [Fact]
    public async Task UpdatePageSortAsync_AfterSoftDelete_ThrowsBusinessException()
    {
        // Arrange
        using var dbContext = CreateDbContext();
        
        // 创建一个业务介绍页
        var page = await CreateTestBusinessPage(dbContext, 1);
        var pageId = page.Id;
        
        var service = new BusinessPageService(dbContext, _mockLogger.Object);
        
        // 执行软删除
        await service.DeletePageAsync(pageId);

        // Act & Assert - 尝试更新已软删除页面的排序
        var exception = await Assert.ThrowsAsync<BusinessException>(
            () => service.UpdatePageSortAsync(pageId, 100));

        Assert.Equal(ErrorCodes.BusinessPageNotFound, exception.Code);
        Assert.Equal("业务介绍页不存在", exception.Message);
    }

    #endregion

    #region 辅助方法

    /// <summary>
    /// 创建内存数据库上下文
    /// </summary>
    private AdminBusinessDbContext CreateDbContext()
    {
        var options = new DbContextOptionsBuilder<AdminBusinessDbContext>()
            .UseInMemoryDatabase(databaseName: Guid.NewGuid().ToString())
            .Options;

        return new AdminBusinessDbContext(options);
    }

    /// <summary>
    /// 创建测试业务介绍页
    /// </summary>
    private async Task<BusinessPage> CreateTestBusinessPage(AdminBusinessDbContext dbContext, int seed)
    {
        var now = DateTime.Now;
        var page = new BusinessPage
        {
            Title = $"测试业务介绍页_{seed}",
            ImageUrl = $"https://example.com/image_{seed}.jpg",
            HasActionButton = false,
            ActionButtonText = null,
            ActionButtonLink = null,
            Sort = seed,
            Status = 1,
            CreateTime = now,
            UpdateTime = now,
            IsDeleted = false
        };
        dbContext.BusinessPages.Add(page);
        await dbContext.SaveChangesAsync();
        return page;
    }

    #endregion
}