using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace YLBattle
{
    /// <summary>
    /// 战场事件处理中心
    /// </summary>
    public class FieldEventDispatcher : IEventDispatcher
    {
        /// <summary>
        /// 上下文环境信息
        /// </summary>
        private BattleParam env = null;

        /// <summary>
        /// 事件队列
        /// </summary>
        private Queue<FieldEvent> mFieldEventQueue = new Queue<FieldEvent>();

        /// <summary>
        /// 事件处理器映射表
        /// </summary>
        private Dictionary<EFieldEventType, Action<FieldEvent>> mHandle = new Dictionary<EFieldEventType, Action<FieldEvent>>();

        /// <summary>
        /// 事件ID生成器
        /// </summary>
        private int mEventIDGenerator = 0;

        /// <summary>
        /// 对象事件
        /// </summary>
        private BattleFighterEventHandler warriorEventHandle = new BattleFighterEventHandler();

        /// <summary>
        /// 初始化
        /// </summary>
        /// <param name="env">环境信息</param>
        public void Initialize(BattleParam env)
        {
            this.env = env;
            this.mFieldEventQueue.Clear();
            this.mHandle.Clear();
            this.mEventIDGenerator = 0;

            this.warriorEventHandle.Initialize(env);
        }

        /// <summary>
        /// 事件投递
        /// </summary>
        /// <param name="ev">事件信息</param>
        public void PostEvent(FieldEvent ev)
        {
            if (ev == null)
            {
                return;
            }

            this.mFieldEventQueue.Enqueue(ev);
        }

        /// <summary>
        /// 创建事件对象
        /// </summary>
        /// <param name="type">事件类型</param>
        /// <returns>事件对象</returns>
        public FieldEvent MakeEvent(EFieldEventType type)
        {
            FieldEvent fe = new FieldEvent();
            fe.id = ++this.mEventIDGenerator;
            fe.type = type;
            fe.ts = DateTime.Now.ToFileTimeUtc();
            return fe;
        }

        /// <summary>
        /// 事件处理注册
        /// </summary>
        /// <param name="type">事件类型</param>
        /// <param name="handle">事件处理器</param>
        public void RegisterEventHandle(EFieldEventType type, Action<FieldEvent> handle)
        {
            if (this.mHandle.ContainsKey(type))
            {
                this.env.DebugHelper().Warning("事件重复注册,编号:" + type.ToString());
                return;
            }
            //this.env.DebugHelper().Error(type.ToString());
            this.mHandle.Add(type, handle);
        }

        /// <summary>
        /// 查询事件处理器
        /// </summary>
        /// <param name="type">事件类型</param>
        /// <returns>处理器</returns>
        private Action<FieldEvent> FindEventHandle(EFieldEventType type)
        {
            if (this.mHandle.ContainsKey(type))
            {
                return this.mHandle[type];
            }

            return null;
        }

        /// <summary>
        /// 调度战场事件
        /// </summary>
        /// <param name="now">当前逻辑时间</param>
        public void OnUpdateFieldEvent(long now)
        {
            if (0 == this.mFieldEventQueue.Count)
            {
                return;
            }

            FieldEvent ev = null;
            Action<FieldEvent> handler = null;

            while (this.mFieldEventQueue.Count > 0)
            {
                ev = this.mFieldEventQueue.Dequeue();
                handler = this.FindEventHandle(ev.type);
                if (null == handler)
                {
                    this.env.DebugHelper().Warning("未知战斗事件:" + ev.type.ToString());
                    continue;
                }

                handler.Invoke(ev);
            }
        }
    }
}