using BuildFlow.Application.Users.Handlers;
using BuildFlow.Application.Users.Queries;
using BuildFlow.Domain.Entities;
using BuildFlow.Infrastructure.Persistence;
using FluentAssertions;
using Microsoft.EntityFrameworkCore;
using Xunit;

namespace BuildFlow.Rag.Tests.Users;

/// <summary>
/// 用户列表查询处理器单元测试。覆盖无搜索、关键字搜索、空表三个场景。
/// </summary>
public class GetUserListQueryHandlerTests
{
    /// <summary>创建 InMemory 数据库 + 种子用户。</summary>
    private static async Task<(RagDbContext db, GetUserListQueryHandler handler)> SetupAsync()
    {
        var options = new DbContextOptionsBuilder<RagDbContext>()
            .UseInMemoryDatabase($"userlist-{Guid.NewGuid()}")
            .Options;
        var db = new RagDbContext(options);

        db.Users.AddRange(
            new User { Id = Guid.NewGuid(), Username = "zhangsan", Email = "z@e.com", PasswordHash = "x", IsActive = true, CreatedBy = "s", UpdatedBy = "s", OperatorIP = "0" },
            new User { Id = Guid.NewGuid(), Username = "lisi", Email = "l@e.com", PasswordHash = "x", IsActive = true, CreatedBy = "s", UpdatedBy = "s", OperatorIP = "0" },
            new User { Id = Guid.NewGuid(), Username = "wangwu", Email = "w@e.com", PasswordHash = "x", IsActive = false, CreatedBy = "s", UpdatedBy = "s", OperatorIP = "0" }
        );
        await db.SaveChangesAsync();

        var handler = new GetUserListQueryHandler(db);
        return (db, handler);
    }

    [Fact]
    public async Task GetUserList_WithoutSearch_ReturnsAllUsers()
    {
        // Arrange
        var (db, handler) = await SetupAsync();

        // Act
        var result = await handler.Handle(new GetUserListQuery(null), CancellationToken.None);

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

    [Fact]
    public async Task GetUserList_WithSearch_ReturnsFilteredUsers()
    {
        // Arrange
        var (db, handler) = await SetupAsync();

        // Act
        var result = await handler.Handle(new GetUserListQuery("zhang"), CancellationToken.None);

        // Assert
        result.Should().HaveCount(1);
        result[0].Username.Should().Be("zhangsan");
    }

    [Fact]
    public async Task GetUserList_OnEmptyDatabase_ReturnsEmptyList()
    {
        // Arrange
        var options = new DbContextOptionsBuilder<RagDbContext>()
            .UseInMemoryDatabase($"userlist-empty-{Guid.NewGuid()}")
            .Options;
        var db = new RagDbContext(options);
        var handler = new GetUserListQueryHandler(db);

        // Act
        var result = await handler.Handle(new GetUserListQuery(null), CancellationToken.None);

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