using Kean.Domain.Task.Commands;
using Kean.Domain.Task.Enums;
using Kean.Domain.Task.Repositories;
using System.Threading;

namespace Kean.Domain.Task.CommandHandlers
{
    /// <summary>
    /// 任务阻塞命令处理程序
    /// </summary>
    public sealed class BlockCommandHandler : CommandHandler<BlockCommand>
    {
        private readonly ICommandBus _commandBus; // 命令总线
        private readonly ITaskRepository _taskRepository; // 任务仓库

        /// <summary>
        /// 依赖注入
        /// </summary>
        public BlockCommandHandler(
            ICommandBus commandBus,
            ITaskRepository taskRepository)
        {
            _commandBus = commandBus;
            _taskRepository = taskRepository;
        }

        /// <summary>
        /// 处理程序
        /// </summary>
        public override async System.Threading.Tasks.Task Handle(BlockCommand command, CancellationToken cancellationToken)
        {
            if (command.ValidationResult.IsValid)
            {
                await _taskRepository.UpdateStatus(command.Id, TaskState.Blocked, command.Message);
            }
            else
            {
                await _commandBus.Notify(command.ValidationResult,
                    cancellationToken: cancellationToken);
            }
        }
    }
}