import { ecs } from "../../../../extensions/oops-plugin-framework/assets/libs/ecs/ECS";
import { Vec3 } from "cc";
import { HeroAttrsComp } from "./HeroAttrsComp";
import { HeroViewComp } from "./HeroViewComp";
import { BuffsList, SkillConfig, SkillSet, SType, TGroup } from "../common/config/SkillSet";
import { Skill } from "../skill/Skill";
import { smc } from "../common/SingletonModuleComp";
import { GameConst } from "../common/config/GameConst";
import { mLogger } from "../common/Logger";

/**
 * ==================== 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('SCastSystem')
export class SCastSystem extends ecs.ComblockSystem implements ecs.ISystemUpdate {
    debugMode: boolean = false;  // 是否启用调试模式
    
    filter(): ecs.IMatcher {
        return ecs.allOf(HeroAttrsComp, HeroViewComp);
    }

    update(e: ecs.Entity): void {
        if(!smc.mission.play ) return;
        if(smc.mission.pause) return
        const heroAttrs = e.get(HeroAttrsComp);
        const heroView = e.get(HeroViewComp);
        if (!heroAttrs || !heroView || !heroView.node) return;
        if (heroAttrs.is_dead || heroAttrs.is_reviving || heroAttrs.isStun() || heroAttrs.isFrost()) return;
        heroAttrs.updateCD(this.dt);
        if (!heroAttrs.is_atking) return;
        const castSkillId = this.pickCastSkill(heroAttrs, heroView);
        if (castSkillId === 0) return;
        this.castSkill(e, castSkillId, heroAttrs, heroView);
    }

    private pickCastSkill(heroAttrs: HeroAttrsComp, heroView: HeroViewComp): number {
        const skillCandidates = [heroAttrs.skill_id, heroAttrs.atk_id];
        for (const s_uuid of skillCandidates) {
            if (!s_uuid) continue;
            const config = SkillSet[s_uuid];
            if (!config) continue;
            const isMainSkill = s_uuid === heroAttrs.skill_id;
            if (isMainSkill && !heroAttrs.can_skill) continue;
            if (!isMainSkill && !heroAttrs.can_atk) continue;
            const targets = this.findTargets(heroView, heroAttrs, config);
            if (targets.length === 0) continue;
            return s_uuid;
        }
        return 0;
    }

    private castSkill(entity: ecs.Entity, s_uuid: number, heroAttrs: HeroAttrsComp, heroView: HeroViewComp) {
        const config = SkillSet[s_uuid];
        if (!config) return;
        const targets = this.findTargets(heroView, heroAttrs, config);
        if (targets.length === 0) return;
        heroView.playSkillEffect(s_uuid);
        const isMainSkill = s_uuid === heroAttrs.skill_id;
        const delay = GameConst.Battle.SKILL_CAST_DELAY;
        heroView.scheduleOnce(() => {
            if (!heroView.node || !heroView.node.isValid || heroAttrs.is_dead) return;
            if (config.SType === SType.damage) {
                this.createSkillEntity(s_uuid, heroView, targets[0].node.position);
            } else {
                this.applySupportSkill(entity, config, targets);
            }
        }, delay);
        if (isMainSkill) {
            heroAttrs.triggerSkillCD();
        } else {
            heroAttrs.triggerAtkCD();
        }
    }

    private createSkillEntity(s_uuid: number, caster: HeroViewComp, targetPos: Vec3) {
        if (!caster.node || !caster.node.isValid) return;
        const parent = caster.node.parent;
        if (!parent) return;
        const skill = ecs.getEntity<Skill>(Skill);
        skill.load(caster.node.position.clone(), parent, s_uuid, targetPos.clone(), caster, 0);
    }

    private applySupportSkill(casterEntity: ecs.Entity, config: SkillConfig, targets: HeroViewComp[]) {
        const casterAttrs = casterEntity.get(HeroAttrsComp);
        if (!casterAttrs) return;
        const ratio = Number(config.ap ?? 0) / 100;
        for (const target of targets) {
            if (!target.ent) continue;
            const model = target.ent.get(HeroAttrsComp);
            if (!model || model.is_dead) continue;
            if (config.SType === SType.heal) {
                const amount = model.hp_max * ratio;
                model.add_hp(amount, true);
                target.health(amount);
                continue;
            }
            if (config.SType === SType.shield) {
                const amount = model.hp_max * ratio;
                model.shield_max = Math.max(model.shield_max, amount);
                model.add_shield(amount, true);
                continue;
            }
            if (config.SType === SType.buff) {
                for (const buffId of config.buffs) {
                    const buffConf = BuffsList[buffId];
                    if (buffConf) {
                        model.addBuff(buffConf);
                    }
                }
            }
        }
        mLogger.log(this.debugMode, "SCastSystem", `[SCastSystem] ${casterAttrs.hero_name} 施放 ${config.name}`);
    }

    private findTargets(caster: HeroViewComp, casterAttrs: HeroAttrsComp, config: SkillConfig): HeroViewComp[] {
        const range = casterAttrs.getCachedMaxSkillDistance() || GameConst.Battle.DEFAULT_SEARCH_RANGE;
        const isEnemy = config.TGroup === TGroup.Enemy;
        const isSelf = config.TGroup === TGroup.Self;
        const isTeam = config.TGroup === TGroup.Team || config.TGroup === TGroup.Ally;
        const isAll = config.TGroup === TGroup.All;
        if (isSelf) return [caster];
        const currentPos = caster.node.position;
        const list: { view: HeroViewComp; dis: number; lane: number }[] = [];
        ecs.query(ecs.allOf(HeroAttrsComp, HeroViewComp)).forEach(ent => {
            const targetAttrs = ent.get(HeroAttrsComp);
            const targetView = ent.get(HeroViewComp);
            if (!targetAttrs || !targetView || !targetView.node || targetAttrs.is_dead) return;
            if (targetView === caster) return;
            const isSameFac = targetAttrs.fac === casterAttrs.fac;
            if (isEnemy && isSameFac) return;
            if (isTeam && !isSameFac) return;
            if (!isEnemy && !isTeam && !isAll) return;
            const dis = Math.abs(currentPos.x - targetView.node.position.x);
            if (dis > range) return;
            const lane = Math.abs(currentPos.y - targetView.node.position.y);
            list.push({ view: targetView, dis, lane });
        });
        list.sort((a, b) => {
            if (a.lane !== b.lane) return a.lane - b.lane;
            return a.dis - b.dis;
        });
        const maxTargets = Math.max(GameConst.Skill.MIN_TARGET_COUNT, 1);
        return list.slice(0, maxTargets).map(item => item.view);
    }
}