using RichCreator.Utility.InputControl;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;

namespace RichCreator.Utility.Skills
{
    /// <summary>
    /// 技能释放队列
    /// </summary>
    public class SkillQueue
    {
        private List<SKillCallTime> callTimes = new List<SKillCallTime>();//可调用的技能列表
        private SkillInfo lastSkill = null;//最后一个调用的技能
        private DateTime lastSkillCallTime = DateTime.MinValue;//最后一个技能的调用时间

        public SkillQueue()
        {
        }
        
        public SkillQueue(HIDCode[] skillCodes)
        {
            for (int i = 0; i < skillCodes.Length; i++)
            {
                EnQueue(false, skillCodes[i]);
            }
        }

        /// <summary>
        /// 向可队列添加技能
        /// </summary>
        /// <param name="isOnce"></param>
        /// <param name="skillCode"></param>
        public void EnQueue(bool isOnce, HIDCode skillCode)
        {
            SkillInfo skill = SkillInfo.GetSkillInfo(skillCode);
            SKillCallTime time = new SKillCallTime(skill,isOnce);
            this.callTimes.Add(time);
        }


        private SkillInfo nextSkill;

        /// <summary>
        /// 阻塞查看队列，但不从队列中删除
        /// </summary>
        /// <returns></returns>
        public SkillInfo SyncPeek()
        {
            if (nextSkill == null)
            {
                nextSkill = FindOk();
            }
            
            return nextSkill;
        }

        /// <summary>
        /// 阻塞出队列
        /// </summary>
        /// <returns></returns>
        public SkillInfo SyncDeQueue()
        {
            SkillInfo result = null;
            if (nextSkill != null)
            {
                result = nextSkill;
                nextSkill = null;
            }
            else
            {
                result = FindOk();
            }

            for (int i = 0; i < this.callTimes.Count; i++)
            {
                if (this.callTimes[i].Skill == result)
                {
                    this.callTimes[i].CallCount++;
                    this.callTimes[i].LastCallTime = DateTime.Now;
                    break;
                }
            }
            
            return result;
        }


        /// <summary>
        /// 查找可以调用的技能
        /// </summary>
        /// <returns></returns>
        private SkillInfo FindOk()
        {
            SKillCallTime callTime = null;
            while (true)
            {
                for (int i = 0; i < callTimes.Count; i++)
                {
                    callTime = callTimes[i];
                    double dimMS = (DateTime.Now - callTime.LastCallTime).TotalMilliseconds;
                    if (dimMS > (callTime.Skill.WaitTime * 1000))
                    {
                        //已经过了技能等待时间
                        if (!callTime.IsOnce || callTime.CallCount <= 0)
                        {
                            //不是限制只调用一次，或一次也没调用过
                            return callTime.Skill;
                        }
                        
                    }
                }

                //Thread.Sleep(100);
            }
        }


        

        /// <summary>
        /// 技能调用时间
        /// </summary>
        private class SKillCallTime
        {
            public SKillCallTime( SkillInfo skill,bool isOnce)
            {
                this.Skill = skill;
                this.IsOnce = isOnce;
                this.LastCallTime = DateTime.MinValue;
                this.CallCount = 0;
            }
            /// <summary>
            /// 技能
            /// </summary>
            public SkillInfo Skill;

            /// <summary>
            /// 上次调用时间
            /// </summary>
            public DateTime LastCallTime;

            /// <summary>
            /// 是否只能调用一次
            /// </summary>
            public bool IsOnce;

            /// <summary>
            /// 调用次数
            /// </summary>
            public Int32 CallCount;
        }
    }
}