import type { MapRegion } from 'db://assets/mx/module/battle/battlefield/MapRegion';
import type { EntityId } from 'db://assets/mx/module/battle/ecs/EntityId';
import type { BattleEventBus } from 'db://assets/mx/module/battle/events/BattleEventBus';
import { BattleEventFactory } from 'db://assets/mx/module/battle/events/BattleEvents';

/** 单玩家槽：经济、城墙、已部署单位 */
export class PlayerSlot {
    /** 玩家 ID */
    readonly id: number;
    /** 当前金币 */
    gold: number;
    /** 城墙当前血量 */
    wallHp: number;
    /** 城墙最大血量 */
    wallMaxHp: number;
    /** 已部署单位实体 ID 列表 */
    deployedUnits: EntityId[] = [];
    /** 可部署区域 */
    region: MapRegion;
    /** 城墙免伤（GM 营地不掉血） */
    immuneWall = false;

    /**
     * @param id 玩家 ID
     * @param wallMaxHp 城墙最大血量
     * @param startGold 初始金币
     * @param region 可部署区域
     */
    constructor(id: number, wallMaxHp: number, startGold: number, region: MapRegion) {
        this.id = id;
        this.wallMaxHp = wallMaxHp;
        this.wallHp = wallMaxHp;
        this.gold = startGold;
        this.region = region;
    }

    /**
     * @param amount 消费金额
     * @returns 金币是否足够并已扣除
     */
    spendGold(amount: number): boolean {
        if (this.gold < amount) return false;
        this.gold -= amount;
        return true;
    }

    /** @param amount 增加金币 */
    addGold(amount: number): void {
        this.gold += amount;
    }

    /**
     * @param amount 伤害量
     * @param events 战斗事件总线
     */
    damageWall(amount: number, events: BattleEventBus): void {
        if (this.immuneWall) return;
        this.wallHp = Math.max(0, this.wallHp - amount);
        events.emit(BattleEventFactory.wallDamaged(this.id, amount, this.wallHp));
    }
}