import type { World, EntityId } from 'db://assets/mx/module/ecs';
import type { ISystem } from 'db://assets/mx/module/ecs';
import { BattlePhase } from '../core/BattlePhase';
import { BattleTeamId } from '../ecs/BattleTeamId';
import { MovementComp, TeamComp } from '../ecs/Components';
import type { PlayerSlot } from '../player/PlayerSlot';
import type { BattleEventBus } from '../events/BattleEventBus';
import type { LifecycleSystem } from './LifecycleSystem';

/** 怪物到达攻击点：对手营地 -1 血并移除该怪 */
export class ReachGoalBaseDamageSystem implements ISystem {
    /** 调度优先级（Movement 50 之后） */
    readonly priority = 55;
    /** 是否启用 */
    enabled = true;
    /** 本帧待结算漏怪 */
    private readonly _leakIds: EntityId[] = [];

    /**
     * @param _world ECS 世界
     * @param _players 玩家槽
     * @param _events 事件总线
     * @param _lifecycle 实体生命周期
     * @param _getPhase 当前战斗阶段
     */
    constructor(
        private readonly _world: World,
        private readonly _players: PlayerSlot[],
        private readonly _events: BattleEventBus,
        private readonly _lifecycle: LifecycleSystem,
        private readonly _getPhase: () => BattlePhase,
    ) {}

    /** 每帧收集已到达攻击点的敌怪并结算漏怪 */
    tick(_dt: number): void {
        if (this._getPhase() !== BattlePhase.COMBAT) return;
        this._leakIds.length = 0;
        this._world.view2(MovementComp, TeamComp).forEach(this._collectLeak);
        for (let i = 0; i < this._leakIds.length; i++) {
            this._applyLeak(this._leakIds[i]);
        }
    }

    /**
     * 收集本帧到达攻击点的敌怪。
     * @param id 实体
     * @param move 移动组件
     * @param team 阵营
     */
    private readonly _collectLeak = (id: EntityId, move: MovementComp, team: TeamComp): void => {
        if (!BattleTeamId.isEnemyTeam(team.team)) return;
        if (!move.reachedGoal || !move.hasAttackGoal) return;
        if (move.spawnProtected || move.presentLocked || move.imprisoned) return;
        if (move.bajiaoBlowRetreating || move.forcePathSpeed > 0) return;
        this._leakIds.push(id);
    };

    /**
     * @param id 到达营地的敌怪
     */
    private _applyLeak(id: EntityId): void {
        if (!this._world.isAlive(id)) return;
        const team = this._world.getComponent(id, TeamComp);
        if (!team) {
            console.log('[ReachGoal] 漏怪无 TeamComp', id);
            this._lifecycle.despawn(id);
            return;
        }
        const slot = this._players[team.ownerId];
        if (!slot) {
            console.log('[ReachGoal] 无对应玩家槽', team.ownerId, id);
            this._lifecycle.despawn(id);
            return;
        }
        if (slot.wallHp > 0) {
            slot.damageWall(1, this._events);
        }
        this._lifecycle.despawn(id);
    }
}