/**
 * 该类用于屏幕适配,一般挂载与Canvas节点
 */
import { _decorator, Component, Node, UITransform, View, Widget ,screen} from 'cc';
const { ccclass, property } = _decorator;

@ccclass('Adapter')
export class ScreenAdapter extends Component {

    public static instance: ScreenAdapter = null as unknown as ScreenAdapter;

    onLoad() 
    {
        if (ScreenAdapter.instance === null) {
            ScreenAdapter.instance = this;
        }
        else {
            ScreenAdapter.instance.destroy();
            return;
        }
        
        console.log("屏幕适配组件加载！", screen, screen.devicePixelRatio, screen.resolution, screen.windowSize, screen.windowSize.width, screen.windowSize.height);
        //获取当前平台(设备)显示的有效分辨率(宽、高)
        let deviceScreenW = screen.windowSize.width;
        let deviceScreenH = screen.windowSize.height;
        //获取当前节点(Canvas)变换组件,用于节点尺寸的获取和屏幕适配的设置
        let _transform = this.getComponent(UITransform);
        //获取当前节点(Canvas)的宽高尺寸
        let nodeCurW = _transform.contentSize.width;
        let nodeCurH = _transform.contentSize.height;
        //通过平台(设备)与节点的宽高比例获取最小值-即
        let srcScaleForShowAll = Math.min(deviceScreenW / nodeCurW, deviceScreenH / nodeCurH);
        console.log("当前最小缩放", srcScaleForShowAll);
        let realWidth = nodeCurW * srcScaleForShowAll;
        let realHeight = nodeCurH * srcScaleForShowAll;
        
        console.log(`计算后的尺寸${nodeCurW * (deviceScreenW / realWidth)}, ${nodeCurH * (deviceScreenH / realHeight)}`);
        // 2. 基于第一步的数据，再做节点宽高适配
        
        _transform.setContentSize(nodeCurW * (deviceScreenW / realWidth),nodeCurH * (deviceScreenH / realHeight))
        // // 3. 因为本节点的宽高发生了改变，所以要手动更新剩下子节点的宽高
        this._updateAllChildNodeWidget(this.node);
        console.log(`适配尺寸数据详情：视图[${deviceScreenW}, ${deviceScreenH}]，缩放[系数-${srcScaleForShowAll}，比例-${realWidth}, ${realHeight}],实际尺寸[${_transform.contentSize.width}, ${_transform.contentSize.height}]`)
        // if (CC_DEBUG) {
        //     cc.log(`节点在SHOW_ALL模式下展示的宽高: ${realWidth} x ${realHeight}`);
        //     cc.log(`节点在SHOW_ALL模式下展示的缩放: ${srcScaleForShowAll}`);
        //     cc.log(
        //         `节点在SHOW_ALL模式下做全屏处理后的实际宽高（${cc.view.getCanvasSize().width}x${
        //             cc.view.getCanvasSize().height
        //         }）等价于于原节点的宽高(${this.node.width}x${this.node.height})`
        //     );
        // }
    }

    private _updateAllChildNodeWidget(node: Node) {
        if (node == null) {
            return;
        }
        let widget = node.getComponent(Widget);
        if (widget != null) {
            widget.updateAlignment();
        }
        if (node.children.length == 0) {
            return;
        }
        node.children.forEach((childNode: Node) => {
            this._updateAllChildNodeWidget(childNode);
        });
    }
}