using BuildFlow.Application.KnowledgeBase.Commands;
using BuildFlow.Application.KnowledgeBase.Handlers;
using BuildFlow.Application.KnowledgeBase.Queries;
using BuildFlow.Domain.Enums;
using BuildFlow.Infrastructure.Persistence;
using BuildFlow.Rag.Tests.Stub;
using BuildFlow.Shared.Domain.Exceptions;
using BuildFlow.Shared.Infrastructure;
using FluentAssertions;
using Microsoft.EntityFrameworkCore;
using Xunit;

namespace BuildFlow.Rag.Tests;

/// <summary>
/// [SOP-RAG] 知识库 CRUD + 列表查询 Handler 全覆盖。
/// 飞书矩阵: rag/KnowledgeBase 子域(Create/Update/Delete/GetList 缺口→全补)
/// </summary>
public class KnowledgeBaseCrudTests
{
    private static RagDbContext CreateDb([System.Runtime.CompilerServices.CallerMemberName] string name = "")
    {
        var userContext = new TestCurrentUserContext();
        var options = new DbContextOptionsBuilder<RagDbContext>()
            .UseInMemoryDatabase($"rag-kb-{name}-{Guid.NewGuid():N}")
            .AddInterceptors(new AuditInterceptor(userContext))
            .Options;
        return new RagDbContext(options);
    }

    [Fact]
    public async Task Create_Valid_ReturnsDtoWithDefaults()
    {
        var db = CreateDb();
        var handler = new CreateKnowledgeBaseCommandHandler(db);

        var result = await handler.Handle(
            new CreateKnowledgeBaseCommand("我的知识库", "描述", null, null, null, null, null, null, null, null, null, null, null),
            CancellationToken.None);

        result.Name.Should().Be("我的知识库");
        result.ChunkSize.Should().Be(500, "默认值");
        result.RetrievalMode.Should().Be((int)RetrievalMode.Hybrid);
        result.VectorWeight.Should().Be(0.7);
        (await db.KnowledgeBases.CountAsync()).Should().Be(1);
    }

    [Fact]
    public async Task Create_EmptyName_ThrowsBusiness()
    {
        var db = CreateDb();
        var handler = new CreateKnowledgeBaseCommandHandler(db);

        var act = async () => await handler.Handle(
            new CreateKnowledgeBaseCommand("  ", null, null, null, null, null, null, null, null, null, null, null, null),
            CancellationToken.None);

        await act.Should().ThrowAsync<BusinessException>("空名称应拒绝");
    }

    [Fact]
    public async Task Update_Existing_OverwritesFields()
    {
        var db = CreateDb();
        var createHandler = new CreateKnowledgeBaseCommandHandler(db);
        var created = await createHandler.Handle(
            new CreateKnowledgeBaseCommand("原名", null, null, null, null, null, null, null, null, null, null, null, null),
            CancellationToken.None);

        var updateHandler = new UpdateKnowledgeBaseCommandHandler(db);
        var result = await updateHandler.Handle(
            new UpdateKnowledgeBaseCommand(created.Id, "新名", "新描述", 800, 100, null, null, null, null, null, null, 0.8, 0.9),
            CancellationToken.None);

        result.Name.Should().Be("新名");
        result.ChunkSize.Should().Be(800);
        result.VectorWeight.Should().Be(0.9);
    }

    [Fact]
    public async Task Update_NonExistent_ThrowsNotFound()
    {
        var db = CreateDb();
        var handler = new UpdateKnowledgeBaseCommandHandler(db);

        var act = async () => await handler.Handle(
            new UpdateKnowledgeBaseCommand(Guid.NewGuid(), "x", null, null, null, null, null, null, null, null, null, null, null),
            CancellationToken.None);

        await act.Should().ThrowAsync<NotFoundException>();
    }

    [Fact]
    public async Task Delete_Existing_RemovesSoftly()
    {
        var db = CreateDb();
        var createHandler = new CreateKnowledgeBaseCommandHandler(db);
        var created = await createHandler.Handle(
            new CreateKnowledgeBaseCommand("待删", null, null, null, null, null, null, null, null, null, null, null, null),
            CancellationToken.None);

        var deleteHandler = new DeleteKnowledgeBaseCommandHandler(db);
        await deleteHandler.Handle(new DeleteKnowledgeBaseCommand(created.Id), CancellationToken.None);

        (await db.KnowledgeBases.AnyAsync(k => k.Id == created.Id)).Should().BeFalse("软删后不可见");
    }

    [Fact]
    public async Task GetList_ReturnsAllActive()
    {
        var db = CreateDb();
        var createHandler = new CreateKnowledgeBaseCommandHandler(db);
        await createHandler.Handle(new CreateKnowledgeBaseCommand("KB1", null, null, null, null, null, null, null, null, null, null, null, null), CancellationToken.None);
        await createHandler.Handle(new CreateKnowledgeBaseCommand("KB2", null, null, null, null, null, null, null, null, null, null, null, null), CancellationToken.None);

        var queryHandler = new GetKnowledgeBasesQueryHandler(db);
        var result = await queryHandler.Handle(new GetKnowledgeBasesQuery(), CancellationToken.None);

        result.Should().HaveCount(2);
    }
}