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

namespace Kean.Domain.Task.Strategies
{
    /// <summary>
    /// 避让策略上下文
    /// </summary>
    public sealed class AvertContext<T> where T : AvertStrategy
    {
        private readonly T _strategy; // 策略实例

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

        /// <summary>
        /// 生成用于避让的移库命令
        /// </summary>
        /// <param name="cell">避让货位</param>
        /// <returns>移库命令</returns>
        public Task<TransferCommand> AutoCommand(Cell cell) => 
            _strategy.AutoCommand(cell);
    }
}