import { _decorator, Component, ProgressBar, Label } from 'cc';
import { ViewManager } from './scripts/core/ViewManager';
import { LevelDataManager } from './scripts/utils/LevelDataManager';
const { ccclass, property } = _decorator;

/**
 * 页面加载组件
 * 负责预加载资源并显示加载进度
 */
@ccclass('PageLoading')
export class PageLoading extends Component {
    @property(ProgressBar)
    progressBar: ProgressBar | null = null;

    @property(Label)
    statusLabel: Label | null = null;

    start() {
        this._startPreload();
    }

    /**
     * 开始预加载
     */
    private async _startPreload(): Promise<void> {
        // 初始化进度条
        if (this.progressBar) {
            this.progressBar.progress = 0;
        }

        // 阶段1: 初始化 LevelDataManager (0-80%)
        await LevelDataManager.instance.initialize((progress, message) => {
            this._updateProgress(progress);
            this._updateStatusLabel(message);
        });

        // 阶段2: 预加载 PageHome (80-100%)
        ViewManager.instance.preload('PageHome',
            (progress) => {
                this._updateProgress(0.8 + progress * 0.2);
            },
            () => {
                this._onPreloadComplete();
            }
        );
    }

    /**
     * 更新进度条
     */
    private _updateProgress(progress: number): void {
        if (this.progressBar) {
            this.progressBar.progress = progress;
        }
    }

    /**
     * 更新状态标签
     */
    private _updateStatusLabel(message: string): void {
        if (this.statusLabel) {
            this.statusLabel.string = message;
        }
    }

    /**
     * 预加载完成回调
     */
    private _onPreloadComplete(): void {
        // 确保进度条显示完成
        this._updateProgress(1);
        this._updateStatusLabel('加载完成');

        // 打开 PageHome
        ViewManager.instance.open('PageHome', {
            onComplete: () => {
                // PageHome 打开成功后，销毁自身
                this.node.destroy();
            }
        });
    }
}