using System;
using System.Collections.Generic;
using Data;
using Entity;
using Managers;
using UnityEngine;

namespace Item
{
    public class WeaponResource : ItemResource
    {
        /// <summary>
        ///     构造函数：通过 WeaponDef 对象初始化 WeaponResource。
        /// </summary>
        /// <param name="def">武器的定义对象。</param>
        /// <exception cref="ArgumentNullException">如果传入的 WeaponDef 为 null，则抛出此异常。</exception>
        public WeaponResource(WeaponDef def)
            : base(def)
        {
            if (def == null) throw new ArgumentNullException(nameof(def), "创建 WeaponResource 时，WeaponDef 不能为 null。");

            Bullet = def.bullet;
            Attributes = new Attributes(def.attributes);
            Type = def.type;

            AttackAnimation = PackagesImageManager.Instance.GetSprites(def.attackAnimation);
            AttackAnimationTime = AttackAnimation.Count / FPS;
            AttackDetectionTime = def.attackDetectionTime;
            UseEntityAttackAnimation = def.useEntityAttackAnimation;

            SelfWeaponDef = def;
        }

        // 武器的属性
        public Attributes Attributes { get; }

        // 武器发射的子弹定义
        public BulletDef Bullet { get; private set; }

        // 武器类型
        public WeaponType Type { get; private set; }

        // 攻击动画的精灵列表
        public IReadOnlyList<Sprite> AttackAnimation { get; }

        // 攻击动画的时长
        public float AttackAnimationTime { get; private set; }

        // 攻击冷却时间
        public float AttackCooldown => 1f / Attributes.attackSpeed;

        // 攻击判定时间
        public float AttackDetectionTime { get; private set; }

        // 是否使用实体自身的攻击动画
        public bool UseEntityAttackAnimation { get; private set; }

        public WeaponDef SelfWeaponDef { get; private set; }
    }
}