using BuildFlow.Application.AiModel.Commands;
using BuildFlow.Application.AiModel.Handlers;
using BuildFlow.Domain.Enums;
using BuildFlow.Infrastructure.Persistence;
using BuildFlow.Shared.Domain.Errors;
using BuildFlow.Shared.Domain.Exceptions;
using FluentAssertions;
using Microsoft.EntityFrameworkCore;
using Xunit;

namespace BuildFlow.Rag.Tests;

/// <summary>
/// 新建 AI 模型处理器测试。成功路径 + 参数校验异常分支。
/// </summary>
public class CreateAiModelCommandHandlerTests
{
    [Fact]
    public async Task Handle_ValidRequest_CreatesModelAndReturnsDto()
    {
        await using var db = CreateDb();
        var handler = new CreateAiModelCommandHandler(db);
        var command = new CreateAiModelCommand(
            "Qwen",
            (int)ModelProviderEnum.LMStudio,
            "qwen2.5-7b",
            "http://localhost:1234/v1",
            "lm-studio",
            (int)ModelTypeEnum.Chat,
            false,
            null,
            null,
            null);

        var result = await handler.Handle(command, CancellationToken.None);

        result.Name.Should().Be("Qwen");
        result.ModelId.Should().Be("qwen2.5-7b");
        result.IsDefault.Should().BeFalse();
        (await db.AiModels.CountAsync()).Should().Be(1);
    }

    [Fact]
    public async Task Handle_EmptyName_ThrowsInvalidParam()
    {
        await using var db = CreateDb();
        var handler = new CreateAiModelCommandHandler(db);
        var command = new CreateAiModelCommand(
            "",
            (int)ModelProviderEnum.LMStudio,
            "qwen2.5-7b",
            "http://localhost:1234/v1",
            "lm-studio",
            (int)ModelTypeEnum.Chat,
            false,
            null,
            null,
            null);

        var act = async () => await handler.Handle(command, CancellationToken.None);
        var ex = await act.Should().ThrowAsync<BusinessException>();
        ex.Which.Code.Should().Be(ErrorCode.InvalidParam);
    }

    [Fact]
    public async Task Handle_InvalidProvider_ThrowsInvalidParam()
    {
        await using var db = CreateDb();
        var handler = new CreateAiModelCommandHandler(db);
        var command = new CreateAiModelCommand(
            "Qwen",
            999,
            "qwen2.5-7b",
            "http://localhost:1234/v1",
            "lm-studio",
            (int)ModelTypeEnum.Chat,
            false,
            null,
            null,
            null);

        var act = async () => await handler.Handle(command, CancellationToken.None);
        var ex = await act.Should().ThrowAsync<BusinessException>();
        ex.Which.Code.Should().Be(ErrorCode.InvalidParam);
    }

    private static RagDbContext CreateDb()
    {
        var options = new DbContextOptionsBuilder<RagDbContext>()
            .UseInMemoryDatabase($"rag-create-aimodel-{Guid.NewGuid():N}")
            .Options;
        var db = new RagDbContext(options);
        db.SavingChanges += (_, _) => RagTestDb.FillAudit(db);
        return db;
    }
}