using AutoMapper;
using Kean.Domain.Stock.Commands;
using Kean.Domain.Stock.Events;
using Kean.Domain.Stock.Repositories;
using Kean.Domain.Stock.SharedServices.Proxies;
using Kean.Infrastructure.Configuration;
using System;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;

namespace Kean.Domain.Stock.CommandHandlers
{
    /// <summary>
    /// 出库命令处理程序
    /// </summary>
    public sealed class AutoOutCommandHandler : CommandHandler<AutoOutCommand>
    {
        private readonly ICommandBus _commandBus; // 命令总线
        private readonly INotification _notifications; // 总线通知
        private readonly IMapper _mapper; // 模型映射
        private readonly IStockRepository _stockRepository; // 存储仓库

        /// <summary>
        /// 依赖注入
        /// </summary>
        public AutoOutCommandHandler(
            ICommandBus commandBus,
            INotification notifications,
            IMapper mapper,
            IStockRepository stockRepository,
            IWarehouseRepository warehouseRepository,
            BarcodeValidator barcodeValidator,
            TaskProxy taskProxy)
        {
            _commandBus = commandBus;
            _notifications = notifications;
            _mapper = mapper;
            _stockRepository = stockRepository;
        }

        /// <summary>
        /// 处理程序
        /// </summary>
        public override async Task Handle(AutoOutCommand command, CancellationToken cancellationToken)
        {
            var original = await _stockRepository.GetCell(command.Barcode);
            // 托盘不存在
            if (!original.HasValue)
            {
                await _commandBus.Notify(nameof(command.Barcode), "托盘不存在", command.Barcode,
                        cancellationToken: cancellationToken);
                return;
            }

            // 时间戳
            command.Timestamp ??= DateTime.Now;

            // 切点事件
            var event0 = _mapper.Map<AutoOutExecutingEvent>(command);
            event0.Cell = original.Value;

            // 成功事件
            var event1 = _mapper.Map<AutoOutSuccessEvent>(command);
            event1.EndTime = command.Timestamp.Value;
            event1.Lines = await _stockRepository.GetLines(event1.Barcode);

            await _commandBus.Trigger(event0, cancellationToken);
            if (!_notifications.Any())
            {
                // 允许删除库存
                var stock = _mapper.Map<Models.Stock>(command);
                stock.Cell = original.Value;
                stock.Timestamp = command.Timestamp.Value;
                if (await _stockRepository.DeleteStock(stock).ContinueWith(task =>
                {
                    if (task.Exception?.InnerException is RepositoryException ex)
                    {
                        task.Exception.Handle(_ => true);
                        _commandBus.Notify(ex.Member.Key, ex.Message, ex.Member.Value,
                            cancellationToken: cancellationToken).Wait();
                        return true;
                    }
                    return false;
                }))
                {
                    return;
                }
                // 成功事件
                await _commandBus.Trigger(event1, cancellationToken);
            }
        }
    }
}