import { _decorator, Component, Node, Sprite, SpriteFrame, resources, find, assetManager } from 'cc';
import { LevelConfigManager } from './LevelConfigManager';
import { SaveDataManager } from './SaveDataManager';
import EventBus, { GameEvents } from '../Core/EventBus';

const { ccclass, property } = _decorator;

/**
 * 背景管理器 - 负责根据关卡配置动态设置游戏背景
 */
@ccclass('BackgroundManager')
export class BackgroundManager extends Component {
    @property(Node)
    backgroundNode: Node = null; // Canvas/GameLevelUI/Background节点

    private backgroundSprite: Sprite = null;
    private levelConfigManager: LevelConfigManager = null;
    private saveDataManager: SaveDataManager = null;

    onLoad() {
        // 获取关卡配置管理器
        this.levelConfigManager = LevelConfigManager.getInstance();
        // 获取SaveDataManager实例
        this.saveDataManager = SaveDataManager.getInstance();
        // 监听关卡开始事件
        EventBus.getInstance().on(GameEvents.GAME_START, this.onGameStart, this);
    }

    start() {
        this.initBackgroundSprite();
    }

    /**
     * 初始化背景Sprite组件
     */
    private initBackgroundSprite() {
        // 如果编辑器中没有设置backgroundNode，尝试自动查找
        if (!this.backgroundNode) {
            this.backgroundNode = find('Canvas/GameLevelUI/Background');
            if (!this.backgroundNode) {
                console.warn('[BackgroundManager] 未找到Canvas/GameLevelUI/Background节点，请检查节点路径');
                return;
            }
        }

        // 获取Sprite组件
        this.backgroundSprite = this.backgroundNode.getComponent(Sprite);
        if (!this.backgroundSprite) {
            console.warn('[BackgroundManager] 背景节点上未找到Sprite组件，请为节点添加Sprite组件');
        } else {
            console.log('[BackgroundManager] 背景Sprite组件初始化成功');
        }
    }



    onDestroy() {
        // 移除事件监听
        EventBus.getInstance().off(GameEvents.GAME_START, this.onGameStart, this);
    }

    /**
     * 游戏开始时设置背景
     */
    private async onGameStart() {
        await this.setBackgroundForCurrentLevel();
    }

    /**
     * 根据当前关卡设置背景图片
     */
    public async setBackgroundForCurrentLevel() {
        if (!this.levelConfigManager || !this.saveDataManager) {
            console.warn('[BackgroundManager] LevelConfigManager或SaveDataManager未初始化');
            return;
        }

        const currentLevel = this.saveDataManager.getCurrentLevel();
        const levelConfig = await this.levelConfigManager.getLevelConfig(currentLevel);
        
        console.log(`[BackgroundManager] 当前关卡: ${currentLevel}`);
        console.log(`[BackgroundManager] 关卡配置:`, levelConfig);
        
        if (levelConfig && levelConfig.backgroundImage) {
            console.log(`[BackgroundManager] 关卡${currentLevel}配置的背景图片: ${levelConfig.backgroundImage}`);
            this.setBackground(levelConfig.backgroundImage);
        } else {
            // 使用默认背景
            this.setBackground('images/LevelBackground/BG1');
            console.log(`[BackgroundManager] 关卡${currentLevel}未配置背景图片，使用默认背景`);
            if (levelConfig) {
                console.log(`[BackgroundManager] 关卡配置中backgroundImage字段值:`, levelConfig.backgroundImage);
            }
        }
    }

    /**
     * 设置背景图片
     * @param imagePath 图片路径（相对于resources目录）
     */
    public setBackground(imagePath: string) {
        if (!this.backgroundSprite) {
            console.warn('[BackgroundManager] 背景Sprite组件未找到，无法设置背景');
            return;
        }

        console.log(`[BackgroundManager] 开始加载背景图片: ${imagePath}`);
        
        // 确保resources bundle已加载
        const resourcesBundle = assetManager.getBundle('resources');
        if (!resourcesBundle) {
            console.warn('[BackgroundManager] resources bundle未找到，尝试加载...');
            assetManager.loadBundle('resources', (err, bundle) => {
                if (err) {
                    console.error('[BackgroundManager] 加载resources bundle失败:', err);
                    return;
                }
                this.loadBackgroundImage(bundle, imagePath);
            });
        } else {
            this.loadBackgroundImage(resourcesBundle, imagePath);
        }
    }

    /**
     * 加载背景图片
     */
    private loadBackgroundImage(bundle: any, imagePath: string) {
        // 正确的SpriteFrame子资源路径
        const spriteFramePath = `${imagePath}/spriteFrame`;
        
        bundle.load(spriteFramePath, SpriteFrame, (err: any, spriteFrame: SpriteFrame) => {
            if (!err && spriteFrame && this.backgroundSprite && this.backgroundSprite.isValid) {
                this.backgroundSprite.spriteFrame = spriteFrame;
                console.log(`[BackgroundManager] 背景图片加载成功: ${imagePath}`);
            } else if (err) {
                console.warn(`[BackgroundManager] 背景图片加载失败: ${spriteFramePath}`, err);
                // 尝试使用resources.load作为备用方案
                resources.load(spriteFramePath, SpriteFrame, (fallbackErr, fallbackSpriteFrame) => {
                    if (!fallbackErr && fallbackSpriteFrame && this.backgroundSprite && this.backgroundSprite.isValid) {
                        this.backgroundSprite.spriteFrame = fallbackSpriteFrame;
                        console.log(`[BackgroundManager] 使用备用方案加载背景成功: ${imagePath}`);
                    } else {
                        // 尝试加载默认背景
                        if (imagePath !== 'images/LevelBackground/BG1') {
                            console.log('[BackgroundManager] 尝试加载默认背景');
                            this.setBackground('images/LevelBackground/BG1');
                        }
                    }
                });
            }
        });
    }

    /**
     * 根据指定关卡设置背景图片
     * @param levelId 关卡ID
     */
    public async setBackgroundForLevel(levelId: number) {
        if (!this.levelConfigManager) {
            console.warn('[BackgroundManager] LevelConfigManager未初始化');
            return;
        }

        const levelConfig = await this.levelConfigManager.getLevelConfig(levelId);
        
        if (levelConfig && levelConfig.backgroundImage) {
            this.setBackground(levelConfig.backgroundImage);
        } else {
            // 使用默认背景
            this.setBackground('images/LevelBackground/BG1');
            console.log(`[BackgroundManager] 关卡${levelId}未配置背景图片，使用默认背景`);
        }
    }
}