import { _decorator, Component, Node, director } from 'cc';
import EventBus, { GameEvents } from '../Core/EventBus';
import { GameState } from '../LevelSystem/IN_game';

const { ccclass } = _decorator;

/**
 * 游戏状态管理器
 * 纯粹的状态管理，不直接执行动作
 */
@ccclass('GamePause')
export class GamePause extends Component {
    public static _instance: GamePause = null;

    // 当前游戏状态
    private currentState: GameState = GameState.PLAYING;

    // 是否允许小球发射子弹（暂停时禁用）
    private bulletFireEnabled: boolean = true;
    
    // 游戏是否在进行中（用于替代对GameManager的直接依赖）
    private isInGameMode: boolean = false;

    start() {
        // 初始化状态
        this.resetGameState();
        
        // 设置事件监听器
        this.setupEventListeners();
    }
    
    /**
     * 设置事件监听器
     */
    private setupEventListeners() {
        const eventBus = EventBus.getInstance();
        
        // 监听游戏暂停重置事件
        eventBus.on(GameEvents.RESET_GAME_PAUSE, this.onResetGamePauseEvent, this);
        
        // 监听游戏开始和结束事件来更新游戏模式状态
        eventBus.on(GameEvents.GAME_START, this.onGameStartEvent, this);
        
        // 监听游戏暂停事件
        eventBus.on(GameEvents.GAME_PAUSE, this.onGamePauseEvent, this);
        eventBus.on(GameEvents.GAME_PAUSE_SKILL_SELECTION, this.onGamePauseEvent, this);
        eventBus.on(GameEvents.GAME_PAUSE_BLOCK_SELECTION, this.onGamePauseEvent, this);
        
        // 监听游戏恢复事件
        eventBus.on(GameEvents.GAME_RESUME, this.onGameResumeEvent, this);
        eventBus.on(GameEvents.GAME_RESUME_SKILL_SELECTION, this.onGameResumeEvent, this);
        eventBus.on(GameEvents.GAME_RESUME_BLOCK_SELECTION, this.onGameResumeEvent, this);
        
        // 监听子弹发射检查事件
        eventBus.on(GameEvents.BALL_FIRE_BULLET, this.onBallFireBulletEvent, this);
        
        // 监听游戏结束状态检查事件
        eventBus.on(GameEvents.GAME_CHECK_OVER, this.onGameCheckOverEvent, this);
        
        // 监听游戏结束事件来重置游戏模式状态
        eventBus.on('GAME_END', this.onGameEndEvent, this);
    }
    
    /**
     * 处理重置游戏暂停事件
     */
    private onResetGamePauseEvent() {
        console.log('[GamePause] 接收到重置游戏暂停事件，重置游戏状态');
        this.resetGameState();
        // 重置游戏模式状态
        this.isInGameMode = false;
        console.log('[GamePause] 游戏模式状态已重置为false');
    }
    
    /**
     * 处理游戏开始事件
     */
    private onGameStartEvent() {
        console.log('[GamePause] 接收到游戏开始事件，设置为游戏模式');
        this.isInGameMode = true;
    }
    
    /**
     * 处理游戏暂停事件
     */
    private onGamePauseEvent() {
        console.log('[GamePause] 接收到游戏暂停事件');
        this.pauseGame();
    }
    
    /**
     * 处理游戏恢复事件
     */
    private onGameResumeEvent() {
        console.log('[GamePause] 接收到游戏恢复事件');
        this.resumeGame();
    }
    
    /**
     * 处理游戏结束事件
     */
    private onGameEndEvent() {
        console.log('[GamePause] 接收到游戏结束事件，退出游戏模式');
        this.isInGameMode = false;
    }
    

    
    /**
     * 处理子弹发射检查事件
     */
    private onBallFireBulletEvent(data: { canFire: (value: boolean) => void }) {
        // 检查是否允许发射子弹
        const canFire = this.bulletFireEnabled && !this.isGameOver() && this.isInGameMode;
        data.canFire(canFire);
    }

    /**
     * 处理游戏结束状态检查事件
     */
    private onGameCheckOverEvent(callback: (isOver: boolean) => void) {
        callback(this.isGameOver());
    }

    /**
     * 设置游戏状态为暂停
     */
    public pauseGame(): void {
        // 检查是否在游戏中
        if (!this.isInGameMode) {
            console.log('[GamePause] 不在游戏中，无法暂停');
            return;
        }
        
        if (this.currentState === GameState.PAUSED) {
            console.log('[GamePause] 游戏已经是暂停状态，跳过重复暂停');
            return;
        }
        
        // 移除游戏结束检查，允许游戏结束时也能暂停
        // 这样可以在成功/失败时暂停所有游戏对象的行为

        console.log('[GamePause] 设置游戏状态为暂停，之前状态:', this.currentState);
        this.currentState = GameState.PAUSED;
        this.bulletFireEnabled = false;

        // 派发暂停事件，让GameManager处理具体动作
        EventBus.getInstance().emit(GameEvents.GAME_PAUSE);
    }

    /**
     * 设置游戏状态为运行
     */
    public resumeGame(): void {
        // 检查是否在游戏中
        if (!this.isInGameMode) {
            console.log('[GamePause] 不在游戏中，无法恢复');
            return;
        }
        
        if (this.currentState === GameState.PLAYING) {
            console.log('[GamePause] 游戏已经是运行状态，跳过重复恢复');
            return;
        }
        
        if (this.isGameOver()) {
            console.log('[GamePause] 游戏已结束，无法恢复，当前状态:', this.currentState);
            return;
        }

        console.log('[GamePause] 设置游戏状态为运行，之前状态:', this.currentState);
        this.currentState = GameState.PLAYING;
        this.bulletFireEnabled = true;

        // 派发恢复事件，让GameManager处理具体动作
        EventBus.getInstance().emit(GameEvents.GAME_RESUME);
    }

    /**
     * 设置游戏状态为成功
     */
    public triggerGameSuccess(): void {
        // 检查是否在游戏中
        if (!this.isInGameMode) {
            console.log('[GamePause] 不在游戏中，无法触发游戏成功');
            return;
        }
        
        if (this.currentState === GameState.SUCCESS || this.currentState === GameState.DEFEAT) {
            return;
        }

        console.log('[GamePause] 设置游戏状态为成功');
        this.currentState = GameState.SUCCESS;
        this.bulletFireEnabled = false;

        // 派发游戏成功事件，让GameManager处理具体动作
        EventBus.getInstance().emit(GameEvents.GAME_SUCCESS);
    }

    /**
     * 设置游戏状态为失败
     */
    public triggerGameDefeat(): void {
        // 检查是否在游戏中
        if (!this.isInGameMode) {
            console.log('[GamePause] 不在游戏中，无法触发游戏失败');
            return;
        }
        
        if (this.currentState === GameState.SUCCESS || this.currentState === GameState.DEFEAT) {
            return;
        }

        console.log('[GamePause] 设置游戏状态为失败');
        this.currentState = GameState.DEFEAT;
        this.bulletFireEnabled = false;

        // 派发游戏失败事件，让GameManager处理具体动作
        EventBus.getInstance().emit(GameEvents.GAME_DEFEAT);
    }

    /**
     * 敌人被击杀事件 - 只管理状态，不执行具体动作
     */
    public onEnemyKilled(): void {
        // 如果游戏已经结束，不执行后续逻辑
        if (this.isGameOver()) {
            console.warn('[GamePause] 游戏已结束状态下onEnemyKilled被调用！当前状态:', this.currentState);
            return;
        }

        // 派发敌人被击杀事件，让GameManager处理具体逻辑
        // 使用自定义事件名称，避免依赖GameEvents中可能不存在的事件
        EventBus.getInstance().emit('ENEMY_KILLED');
    }

    /**
     * 检查游戏是否结束
     */
    public isGameOver(): boolean {
        return this.currentState === GameState.SUCCESS || this.currentState === GameState.DEFEAT;
    }

    /**
     * 重置游戏状态
     */
    public resetGameState(): void {
        console.log('[GamePause] 重置游戏状态');
        this.currentState = GameState.PLAYING;
        this.bulletFireEnabled = true;
        console.log('[GamePause] 游戏状态重置完成');
    }

    /**
     * 检查是否为暂停状态
     */
    public isPaused(): boolean {
        return this.currentState === GameState.PAUSED;
    }

    /**
     * 检查是否允许发射子弹
     */
    public isBulletFireEnabled(): boolean {
        return this.bulletFireEnabled;
    }

    /**
     * 获取当前游戏状态
     */
    public getCurrentState(): GameState {
        return this.currentState;
    }

    /**
     * 强制设置游戏状态（谨慎使用）
     */
    public forceSetState(state: GameState): void {
        this.currentState = state;
        this.bulletFireEnabled = (state === GameState.PLAYING);
        console.log(`[GamePause] 强制设置状态为: ${state}`);
    }

    /**
     * 获取单例实例
     */
    public static getInstance(): GamePause {
        if (!GamePause._instance) {
            // 创建节点和组件
            const gamePauseNode = new Node('GamePause');
            GamePause._instance = gamePauseNode.addComponent(GamePause);
            
            // 将节点添加到场景中（不销毁）
            const scene = director.getScene();
            if (scene) {
                scene.addChild(gamePauseNode);
            }
        }
        return GamePause._instance;
    }

    onDestroy() {
        // 清理事件监听
        const eventBus = EventBus.getInstance();
        eventBus.off(GameEvents.RESET_GAME_PAUSE, this.onResetGamePauseEvent, this);
        eventBus.off(GameEvents.GAME_START, this.onGameStartEvent, this);
        eventBus.off(GameEvents.GAME_PAUSE, this.onGamePauseEvent, this);
        eventBus.off(GameEvents.GAME_PAUSE_SKILL_SELECTION, this.onGamePauseEvent, this);
        eventBus.off(GameEvents.GAME_PAUSE_BLOCK_SELECTION, this.onGamePauseEvent, this);
        eventBus.off(GameEvents.GAME_RESUME, this.onGameResumeEvent, this);
        eventBus.off(GameEvents.GAME_RESUME_SKILL_SELECTION, this.onGameResumeEvent, this);
        eventBus.off(GameEvents.GAME_RESUME_BLOCK_SELECTION, this.onGameResumeEvent, this);
        eventBus.off(GameEvents.BALL_FIRE_BULLET, this.onBallFireBulletEvent, this);
        eventBus.off(GameEvents.GAME_CHECK_OVER, this.onGameCheckOverEvent, this);
        eventBus.off('GAME_END', this.onGameEndEvent, this);
        
        GamePause._instance = null;
    }
}