import type { BattleServices } from '../combat/BattleServices';
import type { AbilityContext } from '../combat/AbilityContext';
import type { EffectSpec } from '../config/BattleConfigTypes';

/** 效果处理器签名 */
export type EffectHandler = (
    services: BattleServices,
    ctx: AbilityContext,
    params: Record<string, unknown>,
    spec: EffectSpec,
) => void;

/** 条件处理器签名 */
export type ConditionHandler = (
    services: BattleServices,
    ctx: AbilityContext,
    params: Record<string, unknown>,
) => boolean;

/**
 * 全局单表：抖音/微信等小游戏分包可能把同一模块加载成两份，
 * 类静态 Map 会分裂成「注册在 A、执行读 B」→ PlayPresentation 丢失 → 表现锁死、塔不攻击。
 */
function globalHandlers<T>(key: string): Map<string, T> {
    const g = globalThis as unknown as Record<string, Map<string, T> | undefined>;
    let m = g[key];
    if (!m) {
        m = new Map();
        g[key] = m;
    }
    return m;
}

const EFFECT_KEY = '__mx_battle_EffectRegistry__';
const CONDITION_KEY = '__mx_battle_ConditionRegistry__';

/** 技能效果注册表 */
export class EffectRegistry {
    private static get _handlers(): Map<string, EffectHandler> {
        return globalHandlers<EffectHandler>(EFFECT_KEY);
    }

    /**
     * @param type 效果类型键
     * @param handler 处理函数
     */
    static register(type: string, handler: EffectHandler): void {
        this._handlers.set(type, handler);
    }

    /**
     * @param type 效果类型键
     * @returns 已注册的处理函数
     */
    static get(type: string): EffectHandler | undefined {
        return this._handlers.get(type);
    }

    /**
     * @param type 效果类型键
     * @returns 是否已注册
     */
    static has(type: string): boolean {
        return this._handlers.has(type);
    }

    /** 清空所有注册（测试用） */
    static clear(): void {
        this._handlers.clear();
    }
}

/** 技能条件注册表 */
export class ConditionRegistry {
    private static get _handlers(): Map<string, ConditionHandler> {
        return globalHandlers<ConditionHandler>(CONDITION_KEY);
    }

    /**
     * @param type 条件类型键
     * @param handler 处理函数
     */
    static register(type: string, handler: ConditionHandler): void {
        this._handlers.set(type, handler);
    }

    /**
     * @param type 条件类型键
     * @returns 已注册的处理函数
     */
    static get(type: string): ConditionHandler | undefined {
        return this._handlers.get(type);
    }

    /**
     * @param services 战斗服务聚合
     * @param ctx 技能上下文
     * @param type 条件类型键
     * @param params 条件参数
     * @returns 条件是否满足（未注册默认 true）
     */
    static evaluate(
        services: BattleServices,
        ctx: AbilityContext,
        type: string,
        params: Record<string, unknown> = {},
    ): boolean {
        const h = this._handlers.get(type);
        return h ? h(services, ctx, params) : true;
    }

    /** 清空所有注册（测试用） */
    static clear(): void {
        this._handlers.clear();
    }
}