using FluentAssertions;
using MediatR;
using Workflow.Application.Integration.Commands;
using Workflow.Application.Integration.Handlers;
using Workflow.Application.Integration.Queries;
using Workflow.Application.Features.WorkflowInstances.Commands;
using Workflow.Domain.Entities;
using Workflow.Domain.Enums;
using Xunit;

namespace BuildFlow.Workflow.Tests.Integration;

/// <summary>
/// AI/RAG 触发工作流的 CQRS 契约测试，禁止回退到 shared service bridge。
/// </summary>
public class WorkflowTriggerCqrsTests
{
    [Fact]
    public async Task StartWorkflowByNameCommand_ShouldDispatchStartInstanceCommand()
    {
        await using var db = TestDbFactory.Create();
        var definition = new WorkflowDefinition
        {
            Id = Guid.NewGuid(),
            Name = "报销审批",
            Code = "expense-approval",
            Status = DefinitionStatus.Published,
            Version = 1,
            IsEnabled = true,
        };
        db.WorkflowDefinitions.Add(definition);
        await db.SaveChangesAsync();
        var instanceId = Guid.NewGuid();
        var sender = new TestSender(instanceId);
        var handler = new StartWorkflowByNameCommandHandler(db, sender);

        var result = await handler.Handle(
            new StartWorkflowByNameCommand("报销", Guid.NewGuid(), """{"amount":1200}"""),
            CancellationToken.None);

        result.Success.Should().BeTrue();
        result.InstanceId.Should().Be(instanceId);
        result.Title.Should().Be("报销");
        sender.StartCommand.Should().NotBeNull();
        sender.StartCommand!.DefinitionCode.Should().Be("expense-approval");
        sender.StartCommand.Title.Should().StartWith("报销-");
        sender.StartCommand.Variables.Should().Be("""{"amount":1200}""");
    }

    [Fact]
    public async Task GetTriggerableWorkflowDefinitionsQuery_ShouldReturnPublishedDefinitions()
    {
        await using var db = TestDbFactory.Create();
        db.WorkflowDefinitions.AddRange(
            new WorkflowDefinition
            {
                Id = Guid.NewGuid(),
                Name = "报销审批",
                Code = "expense-approval",
                Status = DefinitionStatus.Published,
                Version = 1,
                IsEnabled = true,
            },
            new WorkflowDefinition
            {
                Id = Guid.NewGuid(),
                Name = "草稿流程",
                Code = "draft-flow",
                Status = DefinitionStatus.Draft,
                Version = 1,
                IsEnabled = true,
            });
        await db.SaveChangesAsync();
        var handler = new GetTriggerableWorkflowDefinitionsQueryHandler(db);

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

        result.Should().ContainSingle();
        result[0].Key.Should().Be("报销审批");
        result[0].Name.Should().Be("报销审批");
    }

    private sealed class TestSender(Guid instanceId) : ISender
    {
        public StartWorkflowInstanceCommand? StartCommand { get; private set; }

        public Task<TResponse> Send<TResponse>(IRequest<TResponse> request, CancellationToken cancellationToken = default)
        {
            if (request is StartWorkflowInstanceCommand command && typeof(TResponse) == typeof(Guid))
            {
                StartCommand = command;
                return Task.FromResult((TResponse)(object)instanceId);
            }

            throw new NotSupportedException($"Unexpected request {request.GetType().Name}");
        }

        public Task Send<TRequest>(TRequest request, CancellationToken cancellationToken = default)
            where TRequest : IRequest
            => throw new NotSupportedException($"Unexpected request {typeof(TRequest).Name}");

        public Task<object?> Send(object request, CancellationToken cancellationToken = default)
            => throw new NotSupportedException($"Unexpected request {request.GetType().Name}");

        public IAsyncEnumerable<TResponse> CreateStream<TResponse>(
            IStreamRequest<TResponse> request,
            CancellationToken cancellationToken = default)
            => throw new NotSupportedException($"Unexpected stream request {request.GetType().Name}");

        public IAsyncEnumerable<object?> CreateStream(object request, CancellationToken cancellationToken = default)
            => throw new NotSupportedException($"Unexpected stream request {request.GetType().Name}");
    }
}