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

/**
 * ==================== 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 CastSkillRequestComp 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('SkillAutocastSystem')
export class SkillAutocastSystem 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 heroModel = e.get(HeroAttrsComp);
        const heroView = e.get(HeroViewComp);
        if (!skills || !heroModel || !heroView) return;
        
        // 检查基本条件
        if (heroModel.is_dead || heroModel.isStun() || heroModel.isFrost()) return;
        
        // 检查是否正在攻击（只有攻击时才释放技能）
        if (!heroModel.is_atking) return;
        
        // 获取所有可施放的技能
        const readySkills = skills.getReadySkills(heroModel.mp);
        if (readySkills.length === 0) return;
        
        // 选择第一个可施放的伤害技能
        for (const skillIndex of readySkills) {
            const skill = skills.getSkill(skillIndex);
            if (!skill) continue;
            
            const config = SkillSet[skill.uuid];
            if (!config || config.SType !== SType.damage) continue;
            
            // ✅ 添加施法请求标记组件
            const request = e.add(CastSkillRequestComp) as CastSkillRequestComp;
            request.skillIndex = skillIndex;
            request.targetPositions = this.selectTargets(heroView);
            
            // 一次只施放一个技能
            break;
        }
    }
    
    /**
     * 选择目标位置
     */
    private selectTargets(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 heroModel = caster.ent.get(HeroAttrsComp);
        const fac = heroModel?.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 selectDamageTargets(caster: HeroViewComp, config: any, maxTargets: number): Vec3[] {
        const targets: Vec3[] = [];
        const heroModel = caster.ent.get(HeroAttrsComp);
        if (!heroModel) return targets;
        
        // 寻找最近的敌人
        const enemyPositions = this.findNearbyEnemies(caster, heroModel.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.selectDefaultTargets(caster, heroModel.fac));
        }
        
        return targets;
    }
    
    /**
     * 选择治疗技能目标
     */
    private selectHealTargets(caster: HeroViewComp, config: any, maxTargets: number): Vec3[] {
        const targets: Vec3[] = [];
        const heroModel = caster.ent.get(HeroAttrsComp);
        if (!heroModel) return targets;
        
        // 寻找血量最低的友军
        const allyPositions = this.findLowHealthAllies(caster, heroModel.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 selectBuffTargets(caster: HeroViewComp, config: any, maxTargets: number): Vec3[] {
        // BUFF技能通常施放在自己或友军身上
        return this.selectHealTargets(caster, config, maxTargets);
    }
    
    /**
     * 选择DEBUFF技能目标
     */
    private selectDebuffTargets(caster: HeroViewComp, config: any, maxTargets: number): Vec3[] {
        // DEBUFF技能通常施放在敌人身上
        return this.selectDamageTargets(caster, config, maxTargets);
    }
    
    /**
     * 选择默认目标
     */
    private selectDefaultTargets(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;
    }

}