import type { BattleSession } from '../core/BattleSession';
import type { MapRegion } from '../battlefield/MapRegion';
import { createSoloRegion } from '../battlefield/MapRegion';
import { PlayerSlot } from './PlayerSlot';

/** 战斗模式策略：单人 / 双阵营（玩家 vs AI） */
export interface IBattleMode {
    /** 模式标识 */
    readonly id: 'solo' | 'pvp';
    /**
     * @param session 战斗会话
     * @returns 初始玩家槽列表
     */
    createPlayers(session: BattleSession): PlayerSlot[];
    /**
     * @param playerId 玩家 ID
     * @param mapRows 地图行数
     * @param mapCols 地图列数
     * @returns 该玩家可部署区域（全图；落子隔离由 CampArea 负责）
     */
    getDeployRegion(playerId: number, mapRows: number, mapCols: number): MapRegion;
}

/** 单人闯关模式 */
export class SoloBattleMode implements IBattleMode {
    readonly id = 'solo' as const;

    /** @inheritdoc */
    createPlayers(session: BattleSession): PlayerSlot[] {
        const level = session.levelDef;
        const region = createSoloRegion(level.mapRows, level.mapCols);
        return [
            new PlayerSlot(0, level.wallHp, level.startGold ?? 0, region),
        ];
    }

    /** @inheritdoc */
    getDeployRegion(_playerId: number, mapRows: number, mapCols: number): MapRegion {
        return createSoloRegion(mapRows, mapCols);
    }
}

/**
 * 双玩家槽位（玩家 vs AI）。
 * 双方部署区均为全图；阵营隔离由 CampAreaPolicy / MapPlaceValidator 负责。
 */
export class PvPBattleMode implements IBattleMode {
    readonly id = 'pvp' as const;

    /** @inheritdoc */
    createPlayers(session: BattleSession): PlayerSlot[] {
        const level = session.levelDef;
        const region = createSoloRegion(level.mapRows, level.mapCols);
        const startGold = level.startGold ?? 0;
        return [
            new PlayerSlot(0, level.wallHp, startGold, region),
            new PlayerSlot(1, level.wallHp, startGold, region),
        ];
    }

    /** @inheritdoc */
    getDeployRegion(_playerId: number, mapRows: number, mapCols: number): MapRegion {
        return createSoloRegion(mapRows, mapCols);
    }
}