import { ecs } from "../../../../extensions/oops-plugin-framework/assets/libs/ecs/ECS";
import { Vec3, v3 } from "cc";
import { HeroAttrsComp } from "./HeroAttrsComp";
import { HeroViewComp } from "./HeroViewComp";
import { SkillSet, SType } from "../common/config/SkillSet";
import { HeroSkillsComp, SkillSlot } from "./HeroSkills";
import { Skill } from "../skill/Skill";

/**
 * ==================== 自动施法系统 ====================
 * 
 * 职责：
 * 1. 检测可施放的技能
 * 2. 根据策略自动施法（AI）
 * 3. 选择目标
 * 4. 添加施法请求标记
 * 
 * 设计理念：
 * - 负责"何时施法"的决策
 * - 通过添加 CSRequestComp 触发施法
 * - 可被玩家输入系统或AI系统复用
 * - 支持多种AI策略
 */
@ecs.register('SACastSystem')
export class SACastSystem extends ecs.ComblockSystem implements ecs.ISystemUpdate {
    
    filter(): ecs.IMatcher {
        return ecs.allOf(HeroSkillsComp, HeroAttrsComp, HeroViewComp);
    }
    
    update(e: ecs.Entity): void {
        const skills = e.get(HeroSkillsComp);
        const heroAttrs = e.get(HeroAttrsComp);
        const heroView = e.get(HeroViewComp);
        if (!skills || !heroAttrs || !heroView) return;
        
        // 检查基本条件
        if (heroAttrs.is_dead || heroAttrs.isStun() || heroAttrs.isFrost()) return;
        
        // 检查是否正在攻击（只有攻击时才释放技能）
        if (!heroAttrs.is_atking) return;
        
        // 获取所有可施放的技能
        const readySkills = skills.getReadySkills(heroAttrs.mp);
        if (readySkills.length === 0) return;
        
        // 选择第一个可施放的伤害技能
        for (const s_uuid    of readySkills) {
            const skill = skills.getSkill(s_uuid);
            if (!skill) continue;
            
            const config = SkillSet[skill.s_uuid];
            if (!config || config.SType !== SType.damage) continue;
            
            // ✅ 开始执行施法
            this.startCast(e,skill);
            
            // 一次只施放一个技能
            break;
        }
    }
    private startCast(e: ecs.Entity,skill:SkillSlot): void {
        if (!skill||!e)  return
        const skills = e.get(HeroSkillsComp);
        const heroAttrs = e.get(HeroAttrsComp);
        const heroView = e.get(HeroViewComp);
        // 3. 检查施法条件
        if (!this.checkCastConditions(skills, heroAttrs, skill.s_uuid)) return
        
        // 4. 执行施法
        this.executeCast(e, skill.s_uuid, heroView);
        // 5. 扣除资源和重置CD
        heroAttrs.mp -= skill.cost;
        skills.resetCD(skill.s_uuid);
    
    }
    /**
     * 检查施法条件
     */
    private checkCastConditions(skills: HeroSkillsComp, heroAttrs: HeroAttrsComp, s_uuid: number): boolean {
        // 检查角色状态
        if (heroAttrs.is_dead) {
            return false;
        }
        
        // 检查控制状态（眩晕、冰冻）
        if (heroAttrs.isStun() || heroAttrs.isFrost()) {
            return false;
        }
        
        // 检查CD和MP
        if (!skills.canCast(s_uuid, heroAttrs.mp)) {
            return false;
        }
        
        return true;
    }
    
    /**
     * 执行施法
     */
    private executeCast(casterEntity: ecs.Entity, s_uuid: number, heroView: HeroViewComp) {
        const config = SkillSet[s_uuid];
        if (!config) {
            console.error("[SACastSystem] 技能配置不存在:", s_uuid);
            return;
        }
        // 1. 播放施法动画
        heroView.playSkillEffect(s_uuid);
        
        // 2. 延迟创建技能实体（等待动画）
        const delay = config.with ?? 0.3;  // 施法前摇时间
        heroView.scheduleOnce(() => {
            this.createSkill(s_uuid, heroView);
        }, delay);
        
        const heroAttrs = casterEntity.get(HeroAttrsComp);
        // console.log(`[SACastSystem] ${heroAttrs?.hero_name ?? '未知'} 施放技能: ${config.name}`);
    }
    
    /**
     * 创建技能实体
     */
    private createSkill(s_uuid: number, caster: HeroViewComp) {
        // 检查节点有效性
        if (!caster.node || !caster.node.isValid) {
            console.warn("[SACastSystem] 施法者节点无效");
            return;
        }
        
        // 获取场景节点
        const parent = caster.node.parent;
        if (!parent) {
            console.warn("[SACastSystem] 场景节点无效");
            return;
        }
        
        // 获取目标位置
        const targets = this.sTargets(caster);
        if (targets.length === 0) {
            console.warn("[SACastSystem] 没有找到有效目标");
            return;
        }
        
        // 创建技能实体
        const skill = ecs.getEntity<Skill>(Skill);
        
        // 获取施法者位置作为起始位置
        const startPos = caster.node.position.clone();
        
        const targetPos = targets[0]; // 使用第一个目标位置
        // console.log(`[SACastSystem]: ${s_uuid}, 起始位置: ${startPos}, 目标位置: ${targetPos}`);
        // 加载技能实体（包括预制体、组件初始化等）
        skill.load(startPos, parent, s_uuid, targetPos, caster);
        
        
    }
    /**
     * 选择目标位置
     */
    private sTargets(caster: HeroViewComp): Vec3[] {
        // 简化版：选择最前方的敌人
        const targets: Vec3[] = [];
        
        // 这里可以调用 SkillConComp 的目标选择逻辑
        // 暂时返回默认位置
        const heroAttrs = caster.ent.get(HeroAttrsComp);
        const fac = heroAttrs?.fac ?? 0;
        const defaultX = fac === 0 ? 400 : -400;
        targets.push(v3(defaultX, 0, 0));
        
        return targets;
    }
    
    /**
     * 选择伤害技能目标
     */
    private sDamageTargets(caster: HeroViewComp, config: any, maxTargets: number): Vec3[] {
        const targets: Vec3[] = [];
        const heroAttrs = caster.ent.get(HeroAttrsComp);
        if (!heroAttrs) return targets;
        
        // 寻找最近的敌人
        const enemyPositions = this.findNearbyEnemies(caster, heroAttrs.fac, config.range || 300);
        
        // 选择最多maxTargets个目标
        for (let i = 0; i < Math.min(maxTargets, enemyPositions.length); i++) {
            targets.push(enemyPositions[i]);
        }
        
        // 如果没有找到敌人，使用默认位置
        if (targets.length === 0) {
            targets.push(...this.sDefaultTargets(caster, heroAttrs.fac));
        }
        
        return targets;
    }
    
    /**
     * 选择治疗技能目标
     */
    private sHealTargets(caster: HeroViewComp, config: any, maxTargets: number): Vec3[] {
        const targets: Vec3[] = [];
        const heroAttrs = caster.ent.get(HeroAttrsComp);
        if (!heroAttrs) return targets;
        
        // 寻找血量最低的友军
        const allyPositions = this.findLowHealthAllies(caster, heroAttrs.fac, config.range || 200);
        
        for (let i = 0; i < Math.min(maxTargets, allyPositions.length); i++) {
            targets.push(allyPositions[i]);
        }
        
        // 如果没有找到友军，治疗自己
        if (targets.length === 0 && caster.node) {
            targets.push(caster.node.position.clone());
        }
        
        return targets;
    }
    
    /**
     * 选择BUFF技能目标
     */
    private sBuffTargets(caster: HeroViewComp, config: any, maxTargets: number): Vec3[] {
        // BUFF技能通常施放在自己或友军身上
        return this.sHealTargets(caster, config, maxTargets);
    }
    
    /**
     * 选择DEBUFF技能目标
     */
    private sDebuffTargets(caster: HeroViewComp, config: any, maxTargets: number): Vec3[] {
        // DEBUFF技能通常施放在敌人身上
        return this.sDamageTargets(caster, config, maxTargets);
    }
    
    /**
     * 选择默认目标
     */
    private sDefaultTargets(caster: HeroViewComp, faction: number): Vec3[] {
        const targets: Vec3[] = [];
        const defaultX = faction === 0 ? 400 : -400;
        targets.push(v3(defaultX, 0, 0));
        return targets;
    }
    
    /**
     * 查找附近的敌人
     */
    private findNearbyEnemies(caster: HeroViewComp, faction: number, range: number): Vec3[] {
        // 简化实现，实际应该查询ECS中的敌方实体
        const enemies: Vec3[] = [];
        
        // 模拟敌人位置
        const enemyX = faction === 0 ? 300 : -300;
        enemies.push(v3(enemyX, 0, 0));
        enemies.push(v3(enemyX + 50, 20, 0));
        
        return enemies;
    }
    
    /**
     * 查找血量低的友军
     */
    private findLowHealthAllies(caster: HeroViewComp, faction: number, range: number): Vec3[] {
        // 简化实现，实际应该查询ECS中的友方实体并按血量排序
        const allies: Vec3[] = [];
        
        // 如果自己血量低，优先治疗自己
        
        
        return allies;
    }
  

}