using MediatR;
using Workflow.Application.Features.WorkflowInstances.Commands;
using BuildFlow.Shared.Domain.Common;
using BuildFlow.Host.Services.Users;

namespace BuildFlow.Host.Endpoints.Workflow.WorkflowInstance;


/// <summary>
/// 发起流程实例端点。POST /workflow-instances，按定义创建实例并产生首个 token。
/// </summary>
public class StartWorkflowInstanceEndpoint(
    IMediator mediator,
    ICurrentUserContext currentUserContext) : Endpoint<StartWorkflowInstanceRequest, Guid>
{
    public override void Configure()
    {
        Post("/workflow-instances");
        Permissions("workflow-instance:start");
        Summary(s =>
        {
            s.Summary = "Start a new workflow instance";
        });
    }

    public override async Task HandleAsync(StartWorkflowInstanceRequest req, CancellationToken ct)
    {
        // 发起人取自当前认证用户，写入 WorkflowInstance.InitiatorId，供撤回鉴权与发起人通知使用。
        var command = new StartWorkflowInstanceCommand(
            req.DefinitionCode,
            req.Title,
            req.Variables,
            req.FormDataJson,
            currentUserContext.GetUserIdGuid());
        var result = await mediator.Send(command, ct);
        await Send.OkAsync(result, ct);
    }
}