using Kean.Domain.Task.Models;
using System;
using System.Linq;
using System.Threading.Tasks;

namespace Kean.Domain.Task.Strategies
{
    /// <summary>
    /// 上架策略上下文
    /// </summary>
    public sealed class InfeedContext<T> where T : InfeedStrategy
    {
        private readonly T _strategy; // 策略实例

        /// <summary>
        /// 初始化 Kean.Domain.Task.Strategies.InfeedContext 类的新实例
        /// </summary>
        public InfeedContext(IServiceProvider serviceProvider) =>
            _strategy = Activator.CreateInstance(typeof(T),
                typeof(T).GetConstructors().First().GetParameters().Select(p => serviceProvider.GetService(p.ParameterType)).ToArray()) as T;

        /// <summary>
        /// 获取自动分配的目标货位
        /// </summary>
        /// <param name="pallet">托盘类型</param>
        /// <param name="original">任务起始位置</param>
        /// <param name="spec">负载规格</param>
        /// <returns>自动分配的目标货位</returns>
        public Task<Cell> AutoDestination(string pallet, Station original, int? spec, int? goodsid) => 
            _strategy.AutoDestination(pallet, original, spec,goodsid);
    }
}