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 { SkillEnt } from "../skill/SkillEnt";
import { HeroSkillsComp } from "./HeroSkills";

/**
 * ==================== 技能施法系统 ====================
 * 
 * 职责：
 * 1. 监听 CastSkillRequestComp 标记组件
 * 2. 检查施法条件（CD、MP、状态）
 * 3. 扣除资源（MP）
 * 4. 创建技能实体
 * 5. 触发施法动画
 * 6. 移除请求标记
 * 
 * 设计理念：
 * - 使用标记组件驱动，符合 ECS 理念
 * - 施法检查与执行分离
 * - 自动处理资源消耗和CD重置
 */
@ecs.register('SkillCastSystem')
export class SkillCastSystem extends ecs.ComblockSystem implements ecs.IEntityEnterSystem {
    
     /**
     * 过滤器：拥有技能数据 + 施法请求的实体
     */
    filter(): ecs.IMatcher {
        return ecs.allOf(HeroSkillsComp, HeroAttrsComp, CastSkillRequestComp);
    }

    /**
     * 实体进入时触发（即请求施法时）
     */
    entityEnter(e: ecs.Entity): void {
        const skillsData = e.get(HeroSkillsComp);
        const heroModel = e.get(HeroAttrsComp);
        const request = e.get(CastSkillRequestComp);
        const heroView = e.get(HeroViewComp);
        
        // 1. 验证数据完整性
        if (!skillsData || !heroModel || !request || !heroView) {
            console.warn("[SkillCastSystem] 数据不完整，取消施法");
            e.remove(CastSkillRequestComp);
            return;
        }
        
        // 2. 获取技能数据
        const skill = skillsData.getSkill(request.skillIndex);
        if (!skill) {
            console.warn(`[SkillCastSystem] 技能索引无效: ${request.skillIndex}`);
            e.remove(CastSkillRequestComp);
            return;
        }
        
        // 3. 检查施法条件
        if (!this.checkCastConditions(skillsData, heroModel, request.skillIndex)) {
            e.remove(CastSkillRequestComp);
            return;
        }
        
        // 4. 执行施法
        this.executeCast(e, skill, request.targetPositions, heroView);
        
        // 5. 扣除资源和重置CD
        heroModel.mp -= skill.cost;
        skillsData.resetCD(request.skillIndex);
        
        // 6. 移除请求标记
        e.remove(CastSkillRequestComp);
    }
    
    /**
     * 检查施法条件
     */
    private checkCastConditions(skillsData: HeroSkillsComp, heroModel: HeroAttrsComp, skillIndex: number): boolean {
        // 检查角色状态
        if (heroModel.is_dead) {
            return false;
        }
        
        // 检查控制状态（眩晕、冰冻）
        if (heroModel.isStun() || heroModel.isFrost()) {
            return false;
        }
        
        // 检查CD和MP
        if (!skillsData.canCast(skillIndex, heroModel.mp)) {
            return false;
        }
        
        return true;
    }
    
    /**
     * 执行施法
     */
    private executeCast(casterEntity: ecs.Entity, skill: any, targetPositions: Vec3[], heroView: HeroViewComp) {
        const config = SkillSet[skill.uuid];
        if (!config) {
            console.error("[SkillCastSystem] 技能配置不存在:", skill.uuid);
            return;
        }
        
        // 1. 播放施法动画
        heroView.playSkillEffect(skill.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.createSkillEntity(skill.uuid, heroView, targetPositions);
        }, delay);
        
        const heroModel = casterEntity.get(HeroAttrsComp);
        console.log(`[SkillCastSystem] ${heroModel?.hero_name ?? '未知'} 施放技能: ${config.name}`);
    }
    
    /**
     * 创建技能实体
     */
    private createSkillEntity(skillId: number, caster: HeroViewComp, targetPositions: Vec3[]) {
        // 检查节点有效性
        if (!caster.node || !caster.node.isValid) {
            console.warn("[SkillCastSystem] 施法者节点无效");
            return;
        }
        
        // 获取场景节点
        const parent = caster.node.parent;
        if (!parent) {
            console.warn("[SkillCastSystem] 场景节点无效");
            return;
        }
        
        // ✅ 使用现有的 SkillEnt 创建技能
        const skillEnt = ecs.getEntity<SkillEnt>(SkillEnt);
        skillEnt.load(
            caster.node.position,   // 起始位置
            parent,                 // 父节点
            skillId,                // 技能ID
            targetPositions,        // 目标位置数组
            caster,                 // 施法者
        );
    }
}