using System;
using Core.Health;
using Core.Utilities;
using TowerDefense.Agents;
using UnityEngine;
using Random = UnityEngine.Random;

namespace ActionGameFramework.Health
{
    /// <summary>
    /// A component that does damage to damageables
    /// </summary>
    public class Damager : MonoBehaviour
    {
        /// <summary>
        /// The amount of damage damager does
        /// </summary>
        public float damage;

        /// <summary>
        /// 用于最后一颗子弹的多倍攻击
        /// </summary>
        public float damageMulti = 1.0f;

        /// <summary>
        /// TEST CODE TO TOWER_NAME
        /// </summary>
        public string towerName = "";

        public bool bSet = false;

        /// <summary>
        /// The event that fires off when the damager has been damaged
        /// </summary>
        public Action<Vector3> hasDamaged;

        /// <summary>
        /// 设置局内升级的对应伤害.
        /// </summary>
        protected float mInSceneUpGradeDamage = 0;

        /// <summary>
        /// Random chance to spawn collision projectile prefab
        /// </summary>
        [Range(0, 1)]
        public float chanceToSpawnCollisionPrefab = 1.0f;

        /// <summary>
        /// The particle system to fire off when the damager attacks
        /// </summary>
        public GameObject collisionObj;

        /// <summary>
        /// The alignment of the damager
        /// </summary>
        public SerializableIAlignmentProvider alignment;


        /// <summary>
        /// Gets the alignment of the damager
        /// </summary>
        public IAlignmentProvider alignmentProvider
        {
            get { return alignment != null ? alignment.GetInterface() : null; }
        }

        protected void Awake()
        {
            doubleHit = false;
        }

        public float inSceneUpGradeDamage
        {
            get { return mInSceneUpGradeDamage; }
            set { mInSceneUpGradeDamage = value; }
        }

        /// <summary>
        /// The logic to set the value of the damage
        /// </summary>
        /// <param name="damageAmount">
        /// The amount to set the damage by, 
        /// will not be set for values less than zero
        /// </param>
        public void SetDamage(float damageAmount)
        {
            if (damageAmount < 0) return;
            damage = damageAmount;
        }

        public bool isCrit
        {
            get
            {
                System.Random mRandom = new System.Random();
                int val = mRandom.Next(0, 15);
                if (val <= 1)
                    return true;
                else
                    return false;
            }
        }

        /// <summary>
        /// 用于精英怪双击.
        /// </summary>
        public bool doubleHit { get; set; }

        /// <summary>
        /// 得到最终的Damage数据,WORK START:
        /// </summary>
        public float finalDamage
        {
            
            
            get {
                float fd = damage * damageMulti;
                damageMulti = 1.0f;
                return fd + inSceneUpGradeDamage; 
            }
        }

        /// <summary>
        /// Damagable will tell damager that it has successful hurt the damagable
        /// </summary>
        public void HasDamaged(Vector3 point, IAlignmentProvider otherAlignment)
        {
            if (hasDamaged != null)
            {
                hasDamaged(point);
            }
        }

        /// <summary>
        /// Instantiate particle system and play it
        /// </summary>
        void OnCollisionEnter(Collision other)
        {
            if (collisionObj == null || Random.value > chanceToSpawnCollisionPrefab)
            {
                return;
            }
        }

        /// <summary>
        /// TEST CODE:把Agent的isTrigger勾上了，所以加入了相关的其它处理。
        /// </summary>
        /// <param name="other"></param>
        protected void OnTriggerEnter(Collider other)
        {
            var ag = other.gameObject.GetComponent<Agent>();
            if (ag == null) return;

            if (collisionObj == null || Random.value > chanceToSpawnCollisionPrefab)
            {
                return;
            }

            // 炮弹击中特效
            GameObject obj = Poolable.TryGetPoolable(collisionObj);
            ParticleSystem ps = obj.GetComponent<ParticleSystem>();
            if (ps == null)
                ps = obj.transform.GetChild(0).GetComponent<ParticleSystem>();
            ps.transform.position = transform.position;
            ps.Play();
        }
    }
}