import type { EntityId } from 'db://assets/mx/module/ecs';
import { BattleTeamId, TeamComp, type BattleSession } from 'db://assets/mx/module/battle';
import { AI_PLAYER_ID } from '../../battle/ai/runtime/AiCampArea';

/**
 * 战斗 Buff 阵营语义（见 docs/需求-战斗Buff阵营语义.md）：
 * - 我方单位：己侧场上塔/神将
 * - 我方出征兵：进攻对面基地的行军怪（画面常在对面半场）
 * - 我方基地：己侧扣墙血区域
 */

/**
 * 行军怪的「出征方」playerId。
 * Team.ownerId = 被进攻方；双人局出征方 = 1 - ownerId。
 * @param session 战斗会话
 * @param entityId 行军实体
 * @returns 0=本机出征，1=AI 出征；非敌军或无法判定返回 -1
 */
export function resolveMarchOwnerPlayerId(session: BattleSession, entityId: EntityId): number {
    const world = session.world;
    if (!world.isAlive(entityId)) return -1;
    const team = world.getComponent(entityId, TeamComp);
    if (!team || !BattleTeamId.isEnemyTeam(team.team)) return -1;
    const targetId = Math.max(0, Math.floor(Number(team.ownerId) || 0));
    if (targetId === 0) return AI_PLAYER_ID;
    if (targetId === 1) return 0;
    return -1;
}