import { _decorator, Node, Component, find } from 'cc';
import EventBus, { GameEvents } from '../Core/EventBus';

const { ccclass, property } = _decorator;

/**
 * 敌人攻击状态管理器
 * 使用字典结构快速查询敌人是否可以被攻击
 * 采用标准单例模式，不依赖BaseSingleton
 */
@ccclass('EnemyAttackStateManager')
export class EnemyAttackStateManager extends Component {
    private static _instance: EnemyAttackStateManager | null = null;

    // 敌人攻击状态字典：key为敌人节点的uuid，value为是否可攻击
    private enemyAttackableStates: Map<string, boolean> = new Map();
    
    // 敌人节点引用字典：key为敌人节点的uuid，value为敌人节点
    private enemyNodeReferences: Map<string, Node> = new Map();

    // Debug（属性检查器展示）
    @property({ tooltip: '是否更新调试信息（属性检查器）' })
    public showDebug: boolean = true;

    @property({ tooltip: '调试信息刷新间隔（秒）' })
    public debugUpdateInterval: number = 0.5;

    // 以下字段通过装饰器在属性检查器中显示（只读调试）
    @property({ tooltip: '敌人总数（只读）' })
    public totalEnemies: number = 0;

    @property({ tooltip: '可攻击敌人数（只读）' })
    public attackableCount: number = 0;

    @property({ type: [String], tooltip: '示例敌人名称（最多10个）' })
    public enemyNameSamples: string[] = [];

    @property({ tooltip: '字典状态预览（JSON，只读）' })
    public statesPreviewJson: string = '';

    // 组件加载时设置单例并注册事件
    onLoad() {
        EnemyAttackStateManager._instance = this;
        this.setupEventListeners();
        if (this.showDebug) {
            this.schedule(this.refreshInspectorDebug.bind(this), Math.max(0.1, this.debugUpdateInterval));
        }
        this.refreshInspectorDebug();
    }

    public static getInstance(): EnemyAttackStateManager {
        // 若已有实例则直接返回
        if (EnemyAttackStateManager._instance) {
            return EnemyAttackStateManager._instance;
        }

        // 尝试从场景中获取或挂载到 Canvas/GameLevelUI/enemyContainer
        const enemyContainer = find('Canvas/GameLevelUI/enemyContainer');
        if (enemyContainer) {
            let comp = enemyContainer.getComponent(EnemyAttackStateManager) as EnemyAttackStateManager;
            if (!comp) {
                comp = enemyContainer.addComponent(EnemyAttackStateManager) as EnemyAttackStateManager;
            }
            EnemyAttackStateManager._instance = comp;
            return comp;
        }

        // 如果未找到节点，返回一个占位的组件实例（不建议，但保证调用不崩溃）
        // 注意：占位实例无法可视化显示，仅用于避免空指针
        const placeholder = new EnemyAttackStateManager();
        EnemyAttackStateManager._instance = placeholder as any;
        return EnemyAttackStateManager._instance;
    }

    private setupEventListeners() {
        const eventBus = EventBus.getInstance();
        
        // 监听敌人隐身开始事件
        eventBus.on(GameEvents.ENEMY_STEALTH_START, this.onEnemyStealthStart, this);
        
        // 监听敌人隐身结束事件
        eventBus.on(GameEvents.ENEMY_STEALTH_END, this.onEnemyStealthEnd, this);
        
        // 监听敌人死亡事件
        eventBus.on('ENEMY_KILLED', this.onEnemyKilled, this);
        
        // 监听清除所有敌人事件
        eventBus.on(GameEvents.CLEAR_ALL_ENEMIES, this.onClearAllEnemies, this);
    }

    /**
     * 注册敌人到攻击状态管理器
     * @param enemyNode 敌人节点
     * @param isAttackable 初始攻击状态，默认为true
     */
    public registerEnemy(enemyNode: Node, isAttackable: boolean = true) {
        if (!enemyNode || !enemyNode.isValid) return;
        
        const enemyId = enemyNode.uuid;
        this.enemyAttackableStates.set(enemyId, isAttackable);
        this.enemyNodeReferences.set(enemyId, enemyNode);
        
        console.log(`[EnemyAttackStateManager] 注册敌人: ${enemyNode.name} (${enemyId}), 可攻击: ${isAttackable}`);
        this.refreshInspectorDebug();
    }

    /**
     * 从攻击状态管理器中移除敌人
     * @param enemyNode 敌人节点
     */
    public unregisterEnemy(enemyNode: Node) {
        if (!enemyNode) return;
        
        const enemyId = enemyNode.uuid;
        this.enemyAttackableStates.delete(enemyId);
        this.enemyNodeReferences.delete(enemyId);
        
        console.log(`[EnemyAttackStateManager] 移除敌人: ${enemyNode.name} (${enemyId})`);
        this.refreshInspectorDebug();
    }

    /**
     * 设置敌人的攻击状态
     * @param enemyNode 敌人节点
     * @param attackable 是否可攻击
     */
    public setEnemyAttackable(enemyNode: Node, attackable: boolean): void {
        if (!enemyNode || !enemyNode.isValid) return;
        
        const enemyId = enemyNode.uuid;
        const previousState = this.enemyAttackableStates.get(enemyId);
        
        this.enemyAttackableStates.set(enemyId, attackable);
        
        // 添加状态变化日志
        if (previousState !== attackable) {
            const stateText = attackable ? '可攻击' : '不可攻击';
            const reasonText = attackable ? '(退出隐身)' : '(进入隐身)';
            console.log(`[EnemyAttackStateManager] 敌人状态变化: ${enemyNode.name} (${enemyId.substring(0, 8)}...) -> ${stateText} ${reasonText}`);
        }
        this.refreshInspectorDebug();
    }

    /**
     * 检查敌人是否可以被攻击
     * @param enemyNode 敌人节点
     * @returns 是否可攻击
     */
    public isEnemyAttackable(enemyNode: Node): boolean {
        if (!enemyNode || !enemyNode.isValid) return false;
        
        const enemyId = enemyNode.uuid;
        return this.enemyAttackableStates.get(enemyId) ?? false;
    }

    /**
     * 获取所有可攻击的敌人节点
     * @returns 可攻击的敌人节点数组
     */
    public getAttackableEnemies(): Node[] {
        const attackableEnemies: Node[] = [];
        
        for (const [enemyId, isAttackable] of this.enemyAttackableStates.entries()) {
            if (isAttackable) {
                const enemyNode = this.enemyNodeReferences.get(enemyId);
                if (enemyNode && enemyNode.isValid) {
                    attackableEnemies.push(enemyNode);
                } else {
                    // 清理无效的引用
                    this.enemyAttackableStates.delete(enemyId);
                    this.enemyNodeReferences.delete(enemyId);
                }
            }
        }
        
        return attackableEnemies;
    }

    /**
     * 清理所有敌人状态
     */
    public clearAllEnemies() {
        this.enemyAttackableStates.clear();
        this.enemyNodeReferences.clear();
        console.log(`[EnemyAttackStateManager] 清理所有敌人状态`);
        this.refreshInspectorDebug();
    }

    /**
     * 获取当前管理的敌人数量
     */
    public getEnemyCount(): number {
        return this.enemyAttackableStates.size;
    }

    /**
     * 获取可攻击敌人数量
     */
    public getAttackableEnemyCount(): number {
        let count = 0;
        for (const isAttackable of this.enemyAttackableStates.values()) {
            if (isAttackable) count++;
        }
        return count;
    }

    // 事件处理方法
    private onEnemyStealthStart(data: { enemy: any, duration?: number }) {
        if (data.enemy && data.enemy.node) {
            this.setEnemyAttackable(data.enemy.node, false);
            console.log(`[EnemyAttackStateManager] 敌人进入隐身状态: ${data.enemy.node.name}`);
        }
    }

    private onEnemyStealthEnd(data: { enemy: any }) {
        if (data.enemy && data.enemy.node) {
            this.setEnemyAttackable(data.enemy.node, true);
            console.log(`[EnemyAttackStateManager] 敌人退出隐身状态: ${data.enemy.node.name}`);
        }
    }

    private onEnemyKilled() {
        // 注意：敌人节点的移除已经在EnemyInstance.onDestroy()中通过unregisterEnemy()处理
        // 这个事件处理器主要用于其他需要响应敌人死亡的逻辑
        console.log(`[EnemyAttackStateManager] 接收到敌人死亡事件`);
    }

    private onClearAllEnemies() {
        this.clearAllEnemies();
    }

    onDestroy() {
        const eventBus = EventBus.getInstance();
        
        // 移除所有事件监听器
        eventBus.off(GameEvents.ENEMY_STEALTH_START, this.onEnemyStealthStart, this);
        eventBus.off(GameEvents.ENEMY_STEALTH_END, this.onEnemyStealthEnd, this);
        eventBus.off('ENEMY_KILLED', this.onEnemyKilled, this);
        eventBus.off(GameEvents.CLEAR_ALL_ENEMIES, this.onClearAllEnemies, this);
        
        // 清空所有数据
        this.enemyAttackableStates.clear();
        this.enemyNodeReferences.clear();
        
        // 清空单例实例
        EnemyAttackStateManager._instance = null;
    }

    // === Debug（属性检查器） ===
    private refreshInspectorDebug() {
        if (!this.showDebug) return;

        // 概览统计
        this.totalEnemies = this.getEnemyCount();
        this.attackableCount = this.getAttackableEnemyCount();

        // 示例名称（最多10个）
        const samples: string[] = [];
        let i = 0;
        for (const [, enemyNode] of this.enemyNodeReferences.entries()) {
            if (enemyNode && enemyNode.isValid) {
                samples.push(enemyNode.name);
                i++;
                if (i >= 10) break;
            }
        }
        this.enemyNameSamples = samples;

        // 预览字典（最多20条，JSON字符串）
        const previewItems: Array<{ name: string; id: string; attackable: boolean }> = [];
        i = 0;
        for (const [enemyId, isAttackable] of this.enemyAttackableStates.entries()) {
            const enemyNode = this.enemyNodeReferences.get(enemyId);
            const name = enemyNode && enemyNode.isValid ? enemyNode.name : '(invalid)';
            previewItems.push({ name, id: enemyId.substring(0, 8), attackable: !!isAttackable });
            i++;
            if (i >= 20) break;
        }
        this.statesPreviewJson = JSON.stringify(previewItems, null, 2);
    }
}