using AutoMapper;
using Kean.Domain.Order.Commands;
using Kean.Domain.Order.Events;
using Kean.Domain.Order.Models;
using Kean.Domain.Order.Repositories;
using System;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;

namespace Kean.Domain.Order.CommandHandlers
{
    /// <summary>
    /// 创建订单命令处理程序
    /// </summary>
    public sealed class CreateOrderCommandHandler : CommandHandler<CreateOrderCommand>
    {
        private readonly ICommandBus _commandBus; // 命令总线
        private readonly IMapper _mapper; // 模型映射
        private readonly IOrderRepository _orderRepository; // 订单仓库

        /// <summary>
        /// 依赖注入
        /// </summary>
        public CreateOrderCommandHandler(
            ICommandBus commandBus,
            IMapper mapper,
            IOrderRepository orderRepository)
        {
            _commandBus = commandBus;
            _mapper = mapper;
            _orderRepository = orderRepository;
        }

        /// <summary>
        /// 处理程序
        /// </summary>
        public override async Task Handle(CreateOrderCommand command, CancellationToken cancellationToken)
        {
            if (command.ValidationResult.IsValid)
            {
                var type = await _orderRepository.GetType(command.Type);
                if (type == null)
                {
                    await _commandBus.Notify(nameof(command.Type), "订单类型不存在", command.Type,
                        cancellationToken: cancellationToken);
                    return;
                }
                //// 根据工作流设置入口节点
                //var node = await _orderRepository.GetNode(command.Flow, "start");
                //if (node == null || !node.Detail.ContainsKey(type.Id))
                //{
                //    await _commandBus.Notify(nameof(command.Flow), "工作流不正确", command.Flow,
                //        cancellationToken: cancellationToken);
                //    return;
                //}
                // 单号处理
                if (type.No == string.Empty)
                {
                    if (string.IsNullOrWhiteSpace(command.No))
                    {
                        await _commandBus.Notify(nameof(command.No), "单号不允许为空", command.No,
                            cancellationToken: cancellationToken);
                        return;
                    }
                    if (await _orderRepository.IsOrderExist(command.No))
                    {
                        await _commandBus.Notify(nameof(command.No), "单号已存在", command.No,
                            cancellationToken: cancellationToken);
                        return;
                    }
                }
                else
                {
                    // 生成单号
                    command.No = string.Empty;
                    var format = Format.Interpret(type.No);
                    if (format.Any(s => s.Type == "serial"))
                    {
                        int? serial = null;
                        foreach (var item in format)
                        {
                            switch (item.Type)
                            {
                                case "serial":
                                    if (!serial.HasValue)
                                    {
                                        if (await _orderRepository.IsSerialExist(type.Id))
                                        {
                                            serial = await _orderRepository.GetSerialValue(type.Id, DateTime.Now, 2000);
                                        }
                                        else
                                        {
                                            var date = format.Where(s => s.Type == "date").ToArray();
                                            // 单号中含有单个时间片段，以此为流水周期
                                            if (date.Length == 1)
                                            {
                                                await _orderRepository.CreateSerial(type.Id, DateTime.Now.ToString(date[0].Value));
                                            }
                                            // 单号中没有时间片段，无限流水
                                            else if (date.Length == 0)
                                            {
                                                await _orderRepository.CreateSerial(type.Id, string.Empty);
                                            }
                                            // 单号中含有多个时间片段，取高精度片段为流水周期
                                            else
                                            {
                                                char? cycle = null;
                                                foreach (var unit in "smHdMy")
                                                {
                                                    foreach (var span in date)
                                                    {
                                                        if (span.Value.IndexOf(unit) >= 0)
                                                        {
                                                            cycle = unit;
                                                            break;
                                                        }
                                                    }
                                                    if (cycle != null)
                                                    {
                                                        break;
                                                    }
                                                }
                                                if (!cycle.HasValue)
                                                {
                                                    await _commandBus.Notify(nameof(command.No), "单号生成失败", command.No,
                                                        cancellationToken: cancellationToken);
                                                    return;
                                                }
                                                await _orderRepository.CreateSerial(type.Id, DateTime.Now.ToString("yyyyMMddHHmmss"[..(1 + "yyyyMMddHHmmss".LastIndexOf(cycle.Value))]));
                                            }
                                            serial = 1;
                                        }
                                        if (!serial.HasValue)
                                        {
                                            await _commandBus.Notify(nameof(command.No), "单号生成失败", command.No,
                                                cancellationToken: cancellationToken);
                                            return;
                                        }

                                    }
                                    command.No += serial.Value.ToString(item.Value);
                                    break;
                                case "date":
                                    command.No += DateTime.Now.ToString(item.Value);
                                    break;
                                default:
                                    command.No += item.Value;
                                    break;
                            }
                        }
                    }
                    else
                    {
                        foreach (var item in format)
                        {
                            command.No += item.Type == "date" ? DateTime.Now.ToString(item.Value) : item.Value;
                        }
                    }
                }
                // 创建订单
                var order = _mapper.Map<Models.Order>(command);
                //order.Node = node.Id;
                Output(nameof(command.Id), order.Id = await _orderRepository.CreateOrder(order));
                var @event = _mapper.Map<CreateOrderSuccessEvent>(command);
                //@event.Node = node.Id;
                await _commandBus.Trigger(@event, cancellationToken);
            }
            else
            {
                await _commandBus.Notify(command.ValidationResult,
                    cancellationToken: cancellationToken);
            }
        }
    }
}