/**
 * 这是一个 使用cocos creator 3.8.2引擎 开发的游戏英雄技能系统TS脚本
 * SkillSet 技能配置表
 * HeroViewComp 英雄视图组件
 * HeroSkillsComp 英雄技能组件
 * Skill 技能实体
 * SkillCom 技能视图组件
 * 目前实现功能：
 * 1. 技能冷却
 * 2. 技能释放
 * 3. 技能目标选择
 * 4. 基础攻击技能的伤害应用 及view的伤害显示
 * 未完成功能



 * 1. 技能的动画显示和运动
 * 2. debuff技能的实现和动画显示
 * 3. buff技能实现和动画显示
 */



import { Node, Vec3 } from "cc";
import { ecs } from "../../../../extensions/oops-plugin-framework/assets/libs/ecs/ECS";
import { HeroViewComp } from "../hero/HeroViewComp";
import { HeroSkillsComp } from "./heroSkillsComp";
import { SkillSet, TargetGroup, TargetType } from "../common/config/SkillSet";
import { CdType } from "../common/config/SkillSet";
import { oops } from "db://oops-framework/core/Oops";
import { GameEvent } from "../common/config/GameEvent";
import { Skill } from "../skills/Skill";
import { SkillCom } from "../skills/SkillCom";


/** 技能系统 */
@ecs.register('HeroSkillSystem')
export class HeroSkillSystem extends ecs.ComblockSystem implements ecs.ISystemUpdate {
    // private updateInterval: number = 0.1; // 每0.1秒更新一次
    // private accumulator: number = 0;
    private _timers: { [key: string]: number } = {};
    private _damageQueue: Array<{ timer: number; callback: () => void }> = [];
    init(): void {
        oops.message.on(GameEvent.MissionEnd, this.clear_timer, this);
    }
    filter(): ecs.IMatcher {
        return ecs.allOf(HeroSkillsComp, HeroViewComp);
    }


    update(e: ecs.Entity) {
        // 处理伤害队列
        this.processDamageQueue();
        const view = e.get(HeroViewComp);
        const skills = e.get(HeroSkillsComp);
        
        // 使用固定时间步长更新
  
            // 只在攻击状态触发技能
            if (view.is_atking) {
                this.processSkills(e, skills);
            }
            
            // 更新所有技能冷却
            skills.skills.forEach(skillId => {
                this.updateCooldown(skills, skillId);
            });
    }

    private processDamageQueue() {
        const delta = this.dt;
        for (let i = this._damageQueue.length - 1; i >= 0; i--) {
            this._damageQueue[i].timer -= delta;
            if (this._damageQueue[i].timer <= 0) {
                this._damageQueue[i].callback();
                this._damageQueue.splice(i, 1);
            }
        }
    }

    /** 处理所有技能逻辑 */
    private processSkills(entity: ecs.Entity, comp: HeroSkillsComp) {
        comp.skills.forEach(skillId => {
            const config = SkillSet[skillId];
            if (!config) return;
           
            // 检查释放条件
            if (this.checkSkillCondition(entity, config)) {
                this.castSkill(entity, skillId, config);
            }
        });
    }

    /** 更新技能冷却 */
    private updateCooldown(comp: HeroSkillsComp, skillId: number) {
        let cd = comp.cooldowns.has(skillId) ? comp.cooldowns.get(skillId)! : 0;
        if (cd > 0) {
            comp.cooldowns.set(skillId, cd - this.dt);
        }
    }

    /** 检查技能释放条件 */
    private checkSkillCondition(entity: ecs.Entity, config: typeof SkillSet[keyof typeof SkillSet]): boolean {
        const view = entity.get(HeroViewComp);
        const comp = entity.get(HeroSkillsComp);
        switch(config.CdType){
            case CdType.SkillCD:
                return (comp.cooldowns.get(config.uuid as number) ?? 0) <= 0;
            case CdType.HeroCD:
                return view.at >= view.cd;
            case CdType.HeroPower:
                return view.pw >= view.pwm;
        }   
    }



    /** 施放技能 */
    private castSkill(caster: ecs.Entity, skillId: number, config: typeof SkillSet[keyof typeof SkillSet]) {
        const view = caster.get(HeroViewComp);
        const comp = caster.get(HeroSkillsComp);
        console.log(view.hero_name+"施放技能:"+config.uuid+"=>"+view.hero_name);
        
        // 处理CD和消耗
        switch(config.CdType) {
            case CdType.SkillCD:
                view.as.max()

                comp.cooldowns.set(skillId, config.cd); // 重置冷却时间
                break;
            case CdType.HeroCD:
                view.as.atk()
                view.at = view.at-view.cd;       // 重置普攻计时器
                break;
            case CdType.HeroPower:
                view.as.max()
                view.pw = view.pw-view.pwm; // 重置能量计时器
                break;
        }
        
        // 选择目标
        const targets = this.selectTargets(caster, config);
        if (targets.length === 0) return;

        // 创建技能实体
        const skillEntity = ecs.getEntity<Skill>(Skill);
        skillEntity.load(
            view.node.position,    // 起始位置
            view.fac,              // 阵营
            view.node.parent,      // 父节点
            config.uuid,           // 技能ID
            targets[0]?.get(HeroViewComp).node.position // 目标位置
        );

        // 应用技能效果
        targets.forEach(target => {
            this.applySkillEffect(caster, target, config);
        });
    }

    /** 选择技能目标 */
    private selectTargets(caster: ecs.Entity, config: typeof SkillSet[keyof typeof SkillSet]): ecs.Entity[] {
        const casterView = caster.get(HeroViewComp);
        const team = casterView.fac;
        const isEnemyTeam = team === 0 ? 1 : 0;
      
        // 第一阶段：基础目标筛选
        let candidates = ecs.query(ecs.allOf(HeroViewComp)).filter(e => {
            const view = e.get(HeroViewComp);
            // 根据技能目标类型筛选
            switch(config.TargetGroup) {
                case TargetGroup.Enemy:
                    return view.fac !== team;
                case TargetGroup.Ally:
                    return view.fac === team && e !== caster;
                case TargetGroup.Self:
                    return e === caster;
                default:
                    return true;
            }
        });

        // 第二阶段：位置/血量等精细筛选
        switch(config.TargetType) {
            case TargetType.Frontline:
                return this.filterFrontRow(candidates, isEnemyTeam);
            case TargetType.Backline:
                return this.filterBackRow(candidates, isEnemyTeam);
            case TargetType.LowestHP:
                return this.filterLowestHealth(candidates);
            case TargetType.HighestHP:
                return this.filterHighestHealth(candidates);
            case TargetType.Melee:
                return candidates.filter(e => e.get(HeroViewComp).type === 0);
            case TargetType.Ranged:
                return candidates.filter(e => e.get(HeroViewComp).type === 1);
            case TargetType.SupportClass:
                return candidates.filter(e => e.get(HeroViewComp).type === 2);
            case TargetType.Random:
                return this.pickRandomTarget(candidates, config.count || 1);
            default:
                return candidates;
        }
    }

    /** 筛选最前排单位 */
    private filterFrontRow(entities: ecs.Entity[], isEnemyTeam: number): ecs.Entity[] {
        // 敌方最前排是x坐标最大的，我方最前排是x坐标最小的
        const keyPos = isEnemyTeam ? 
            Math.min(...entities.map(e => e.get(HeroViewComp).node.position.x)) :
            Math.max(...entities.map(e => e.get(HeroViewComp).node.position.x));
            
        return entities.filter(e => 
            Math.abs(e.get(HeroViewComp).node.position.x - keyPos) < 10
        );
    }

    /** 筛选最后排单位 */
    private filterBackRow(entities: ecs.Entity[], isEnemyTeam: number): ecs.Entity[] {
        // 敌方最后排是x坐标最小的，我方最后排是x坐标最大的
        const keyPos = isEnemyTeam ?
            Math.max(...entities.map(e => e.get(HeroViewComp).node.position.x)) :
            Math.min(...entities.map(e => e.get(HeroViewComp).node.position.x));
            
        return entities.filter(e => 
            Math.abs(e.get(HeroViewComp).node.position.x - keyPos) < 10
        );
    }

    /** 筛选血量最低单位 */
    private filterLowestHealth(entities: ecs.Entity[]): ecs.Entity[] {
        const minHp = Math.min(...entities.map(e => e.get(HeroViewComp).hp));
        return entities.filter(e => e.get(HeroViewComp).hp === minHp);
    }

    /** 筛选血量最高单位 */
    private filterHighestHealth(entities: ecs.Entity[]): ecs.Entity[] {
        const maxHp = Math.max(...entities.map(e => e.get(HeroViewComp).hp));
        return entities.filter(e => e.get(HeroViewComp).hp === maxHp);
    }

    /** 随机选择目标 */
    private pickRandomTarget(entities: ecs.Entity[], count: number): ecs.Entity[] {
        const shuffled = [...entities].sort(() => 0.5 - Math.random());
        return shuffled.slice(0, count);
    }

    /** 应用技能效果 */
    private applySkillEffect(caster: ecs.Entity, target: ecs.Entity, config: typeof SkillSet[keyof typeof SkillSet]) {
        const casterView = caster.get(HeroViewComp);
        const targetView = target.get(HeroViewComp);
        
        // 直接计算伤害（包含防御减免）
        const damageResult = this.calculateDamage(caster, target, config);
        this.applyDamage(target, damageResult);
        
        // 播放技能特效
        casterView.playSkillEffect(config.uuid);
        console.log(`${casterView.hero_name} 对 ${targetView.hero_name} 造成 ${damageResult.value}伤害`);
    }

    private calculateDamage(caster: ecs.Entity, target: ecs.Entity, config: typeof SkillSet[keyof typeof SkillSet]) {
        const result = {
            value :0, // 确保最小伤害为1
            isCrit : false,
            isDodged : false,
            delay : 0.3,
            ignoreDefense : false,
            canCrit : true,
        }
       
        const targetView =target.get(HeroViewComp);
        const sourceView =caster.get(HeroViewComp);
        let final = sourceView.ap*config.ap/100;

        // 伤害浮动（±10%）
        const damageFloat = 0.9 + Math.random() * 0.2; // 0.9~1.1
        final *= damageFloat;
        final = Math.round(final);


        // 闪避判定
        if (Math.random()*100 < targetView.dodge) {
            result.isDodged = true
            return result
        }

        // 护甲减伤
        if (!result.ignoreDefense) {
            const effectiveArmor = Math.min(targetView.def, 300); // 最大减伤75%
            const damageReduction = effectiveArmor / (effectiveArmor + 100);
            final *= (1 - damageReduction);
            final = Math.round(final); // 四舍五入取整
        }

        // 暴击判定
        let isCrit = false;
        if (result.canCrit) {
            const critRate = sourceView.crit;
            if (Math.random() * 100 < critRate) {
                final *= 1.5;
                isCrit = true;
            }
        }

        result.value = Math.max(1, final); // 确保最小伤害为1
        result.isCrit = isCrit;
        
        return result;
    }

    private applyDamage(target: ecs.Entity, result: any) {
        this._damageQueue.push({
            timer: result.delay,
            callback: () => {
                const view = target.get(HeroViewComp);
                if (!view?.ent.has(HeroViewComp)) return;

                if(result.isDodged){
                    view.BUFFCOMP.tooltip(5,"*闪避*");
                    return;
                }

                let remainingDamage = result.value;
                if (view.shield > 0) {
                    const shieldAbsorb = Math.min(view.shield, remainingDamage);
                    view.shield -= shieldAbsorb;
                    remainingDamage -= shieldAbsorb;
                    
                    if (view.shield <= 0) {
                        view.BUFFCOMP.show_shield(false);
                    }
                }
                
                if (remainingDamage > 0) {
                    view.hp -= remainingDamage;
                    if(view.hp <= 0) {
                        view.BUFFCOMP.dead()
                        view.exp_add(view.dexp)
                        view.to_grave();
                    }
                    view.showDamage(result.value, result.isCrit);
                } else {
                    view.BUFFCOMP.tooltip(5,"*吸收*");
                }

            }
        });
    }

    public clear_timer() {
        console.log("clear_timer");
        Object.values(this._timers).forEach(clearTimeout);
    }
    onDestroy() {
        Object.values(this._timers).forEach(clearTimeout);
    }


    /** 应用负面状态 */
    private applyDebuff(target: ecs.Entity, config: typeof SkillSet[keyof typeof SkillSet]) {
        // 实现debuff逻辑...
    }

    /** 外部调用重置冷却 */
    public resetSkillCooldown(entity: ecs.Entity, skillId: number) {
        const comp = entity.get(HeroSkillsComp);
        comp.resetCooldown(skillId);
    }

    /** 重置所有技能冷却 */
    public resetAllCooldowns(entity: ecs.Entity) {
        const comp = entity.get(HeroSkillsComp);
        comp.resetAllCooldowns();
    }
}