using BuildFlow.Platform.Application.Roles.Commands;
using BuildFlow.Platform.Application.Roles.Handlers;
using BuildFlow.Platform.Application.Users.Commands;
using BuildFlow.Platform.Application.Users.Handlers;
using BuildFlow.Platform.Application.Users.Queries;
using BuildFlow.Platform.Infrastructure.Persistence;
using BuildFlow.Shared.Domain.Errors;
using BuildFlow.Shared.Domain.Exceptions;
using FluentAssertions;
using Microsoft.EntityFrameworkCore;
using Xunit;

namespace BuildFlow.Platform.Tests.Users;

/// <summary>
/// [SOP-PLATFORM] Users 模块 6 个 Handler 覆盖测试。
/// 覆盖: GetList / GetById / GetNames / Create / Update / Delete。
/// 飞书矩阵: platform/Users 子域(6 Handler 零覆盖→全补)。
/// </summary>
public class UsersHandlerTests
{
    private static PlatformDbContext CreateDb([System.Runtime.CompilerServices.CallerMemberName] string name = "")
        => PlatformTestDb.CreateDbContext(name);

    private static async Task SeedUserRole(PlatformDbContext db)
        => await new CreateRoleCommandHandler(db).Handle(new CreateRoleCommand("User", null), CancellationToken.None);

    #region GetUserList

    [Fact]
    public async Task GetUserList_ReturnsAll()
    {
        var db = CreateDb();
        await PlatformTestDb.SeedUserAsync(db, Guid.NewGuid(), "u1");
        await PlatformTestDb.SeedUserAsync(db, Guid.NewGuid(), "u2");
        var result = await new GetUserListQueryHandler(db)
            .Handle(new GetUserListQuery(null), CancellationToken.None);
        result.Should().HaveCount(2);
    }

    [Fact]
    public async Task GetUserList_SearchFilters()
    {
        var db = CreateDb();
        await PlatformTestDb.SeedUserAsync(db, Guid.NewGuid(), "searchme");
        await PlatformTestDb.SeedUserAsync(db, Guid.NewGuid(), "otherguy");
        var result = await new GetUserListQueryHandler(db)
            .Handle(new GetUserListQuery("searchme"), CancellationToken.None);
        result.Should().ContainSingle();
        result[0].Username.Should().Be("searchme");
    }

    #endregion

    #region GetUserById

    [Fact]
    public async Task GetUserById_Existing_ReturnsDto()
    {
        var db = CreateDb();
        var user = await PlatformTestDb.SeedUserAsync(db, Guid.NewGuid(), "bob");
        var result = await new GetUserByIdQueryHandler(db)
            .Handle(new GetUserByIdQuery(user.Id), CancellationToken.None);
        result.Username.Should().Be("bob");
    }

    [Fact]
    public async Task GetUserById_NonExistent_ThrowsNotFound()
    {
        var db = CreateDb();
        var act = async () => await new GetUserByIdQueryHandler(db)
            .Handle(new GetUserByIdQuery(Guid.NewGuid()), CancellationToken.None);
        var ex = await act.Should().ThrowAsync<NotFoundException>();
        ex.Which.Code.Should().Be(ErrorCode.NotFound);
    }

    #endregion

    #region GetUserNames

    [Fact]
    public async Task GetUserNames_EmptyIds_ReturnsEmpty()
    {
        var db = CreateDb();
        var result = await new GetUserNamesQueryHandler(db)
            .Handle(new GetUserNamesQuery(new List<Guid>()), CancellationToken.None);
        result.Should().BeEmpty();
    }

    [Fact]
    public async Task GetUserNames_WithIds_ReturnsMap()
    {
        var db = CreateDb();
        var user = await PlatformTestDb.SeedUserAsync(db, Guid.NewGuid(), "namer");
        var result = await new GetUserNamesQueryHandler(db)
            .Handle(new GetUserNamesQuery(new List<Guid> { user.Id }), CancellationToken.None);
        result.Should().ContainKey(user.Id);
        result[user.Id].Should().Be("namer");
    }

    #endregion

    #region CreateUser

    [Fact]
    public async Task CreateUser_Valid_ReturnsDtoAndAssignsUserRole()
    {
        var db = CreateDb();
        await SeedUserRole(db);
        var result = await new CreateUserCommandHandler(db)
            .Handle(new CreateUserCommand("alice", "alice@test.local", "Pass@123"), CancellationToken.None);
        result.Username.Should().Be("alice");
        result.Roles.Should().Contain("User");
        (await db.Users.CountAsync()).Should().Be(1);
    }

    [Fact]
    public async Task CreateUser_DuplicateUsername_ThrowsBusiness()
    {
        var db = CreateDb();
        await SeedUserRole(db);
        await new CreateUserCommandHandler(db)
            .Handle(new CreateUserCommand("alice", "alice@test.local", "Pass@123"), CancellationToken.None);
        var act = async () => await new CreateUserCommandHandler(db)
            .Handle(new CreateUserCommand("alice", "other@test.local", "Pass@123"), CancellationToken.None);
        var ex = await act.Should().ThrowAsync<BusinessException>();
        ex.Which.Code.Should().Be(ErrorCode.AlreadyExists);
    }

    #endregion

    #region UpdateUser

    [Fact]
    public async Task UpdateUser_Existing_UpdatesFields()
    {
        var db = CreateDb();
        var user = await PlatformTestDb.SeedUserAsync(db, Guid.NewGuid(), "carol");
        var result = await new UpdateUserCommandHandler(db)
            .Handle(new UpdateUserCommand(user.Id, "carol2@test.local", null, false), CancellationToken.None);
        result.Email.Should().Be("carol2@test.local");
        result.IsActive.Should().BeFalse();
    }

    [Fact]
    public async Task UpdateUser_NonExistent_ThrowsNotFound()
    {
        var db = CreateDb();
        var act = async () => await new UpdateUserCommandHandler(db)
            .Handle(new UpdateUserCommand(Guid.NewGuid(), null, null, null), CancellationToken.None);
        var ex = await act.Should().ThrowAsync<NotFoundException>();
        ex.Which.Code.Should().Be(ErrorCode.NotFound);
    }

    #endregion

    #region DeleteUser

    [Fact]
    public async Task DeleteUser_Existing_Removes()
    {
        var db = CreateDb();
        var user = await PlatformTestDb.SeedUserAsync(db, Guid.NewGuid(), "dave");
        await new DeleteUserCommandHandler(db).Handle(new DeleteUserCommand(user.Id), CancellationToken.None);
        (await db.Users.CountAsync()).Should().Be(0);
    }

    [Fact]
    public async Task DeleteUser_NonExistent_ThrowsNotFound()
    {
        var db = CreateDb();
        var act = async () => await new DeleteUserCommandHandler(db)
            .Handle(new DeleteUserCommand(Guid.NewGuid()), CancellationToken.None);
        var ex = await act.Should().ThrowAsync<NotFoundException>();
        ex.Which.Code.Should().Be(ErrorCode.NotFound);
    }

    #endregion
}