using System.Collections.Generic;
using ActionGameFramework.Health;
using Core.Utilities;
using UnityEngine;

namespace TowerDefense.Towers.TowerLaunchers
{
    public abstract class Launcher : MonoBehaviour, ILauncher
    {
        protected ParticleSystem particleToPlay;
        /// <summary>
        /// 派生类，只需要真正实现这一个函数就可以了，其它的函数都是通过这一个函数来实现的。
        /// </summary>
        /// <param name="enemy"></param>
        /// <param name="attack"></param>
        /// <param name="firingPoint"></param>
        public abstract void Launch(Targetable enemy, GameObject attack, Transform firingPoint, int idx = 0);

        /// <summary>
        /// Gets an instance of the attack object from the Pool and Launches it
        /// </summary>
        /// <param name="enemies">
        /// The list of enemies to sample from
        /// </param>
        /// <param name="attack">
        /// The object used to attack
        /// </param>
        /// <param name="firingPoints"></param>
        public virtual void Launch(List<Targetable> enemies, GameObject attack, Transform[] firingPoints, int maxAttack = 1)
        {
            int count = enemies.Count;
            int currentFiringPointIndex = 0;
            int firingPointLength = firingPoints.Length;
            count = count > maxAttack ? maxAttack : count;
            for (int i = 0; i < count; i++)
            {
                Targetable enemy = enemies[i];
                Transform firingPoint = firingPoints[currentFiringPointIndex];
                currentFiringPointIndex = (currentFiringPointIndex + 1) % firingPointLength;
                var poolable = Poolable.TryGetPoolable<Poolable>(attack);
                if (poolable == null)
                {
                    return;
                }
                // 
                // 此处设置局内升级数据对应的攻击数据:
                Damager tm = poolable.gameObject.GetComponent<Damager>();
                if (tm)
                {
                    Damager srctm = attack.GetComponent<Damager>();
                    tm.inSceneUpGradeDamage = srctm.inSceneUpGradeDamage;
                    tm.doubleHit = srctm.doubleHit;
                    //Debug.Log("源始局内升级数据是:" + srctm.inSceneUpGradeDamage);
                }

                Launch(enemy, poolable.gameObject, firingPoint, i);
            }
        }

        /// <summary>
        /// Gets a instance of attack from the Pool and Launches it
        /// </summary>
        /// <param name="enemy">
        /// The enemy launcher is attacking
        /// </param>
        /// <param name="attack">
        /// The object used to attack the enemy
        /// </param>
        /// <param name="firingPoints"></param>
        public virtual void Launch(Targetable enemy, GameObject attack, Transform[] firingPoints)
        {
            var poolable = Poolable.TryGetPoolable<Poolable>(attack);
            if (poolable == null)
            {
                return;
            }

            // 
            // 此处设置局内升级数据对应的攻击数据:
            Damager tm = poolable.gameObject.GetComponent<Damager>();
            if (tm)
            {
                Damager srctm = attack.GetComponent<Damager>();
                tm.inSceneUpGradeDamage = srctm.inSceneUpGradeDamage;
                tm.doubleHit = srctm.doubleHit;

                // 
                // 最后一颗子弹的多倍伤害.
                tm.damageMulti = srctm.damageMulti;
                srctm.damageMulti = 1.0f;
                //Debug.Log("源始局内升级数据是:" + srctm.inSceneUpGradeDamage);
            }
            // WORK START: 从  Pool 内获取数据的时候，就把原来的数据清除掉了.
            Launch(enemy, poolable.gameObject, firingPoints[0]); //GetRandomTransform(firingPoints));
        }

        /// <summary>
        /// Sets up a particle system to provide aiming feedback
        /// </summary>
        /// <param name="particleSystemToPlay">
        /// The Particle system to fire
        /// </param>
        /// <param name="origin">
        /// The position of the particle system
        /// </param>
        /// <param name="lookPosition">
        /// The direction the particle system is looking
        /// </param>
        public void PlayParticles(ParticleSystem particleSystemToPlay, Vector3 origin, Vector3 lookPosition)
        {

            if (particleSystemToPlay == null)
            {
                return;
            }

            particleSystemToPlay.transform.position = origin;
            particleSystemToPlay.transform.LookAt(lookPosition);
            particleSystemToPlay.Play();


            // if( !particleToPlay )
            // 	particleToPlay = Instantiate(particleSystemToPlay);
            // particleToPlay.transform.position = origin;
            // particleToPlay.transform.LookAt(lookPosition);
            // particleToPlay.Play(); 

            //Debug.Log("播放粒子系统:" + particleSystemToPlay.name);
        }

        /// <summary>
        /// Gets a random transform from a list
        /// </summary>
        /// <param name="launchPoints">
        /// The list of transforms to use
        /// </param>
        public Transform GetRandomTransform(Transform[] launchPoints)
        {
            int index = Random.Range(0, launchPoints.Length);
            return launchPoints[index];
        }
    }
}