//一个简单的tost组件，用法：
// let Toast = reqire('Toast.js')
// Toast(text,{gravity,duration,bg_color})
//text:要显示的字符串
//gravity(可选):位置，String类型，可选值('CENTER','TOP','BOTTOM'),默认为'CENTER'
//duration(可选):时间，Number类型，单位为秒，默认1s
//bg_color(可选):颜色，cc.color类型，默认cc.color(102, 102, 102, 200)
function Toast(
    text = "",
    {
        gravity = "CENTER",
        duration = 1,
        bg_color = cc.color(102,102,102,200)
    } = {}
){
    //canvas
    let canvas = cc.director.getScene().getComponentInChildren(cc.Canvas);
    let width = canvas.node.width;
    let height = canvas.node.height;

    let bgNode = new cc.Node();

    //Label文本格式设置
    let textNode = new cc.Node();
    let textLabel = textNode.addComponent(cc.Label);
    textLabel.horizontalAlign = cc.Label.HorizontalAlign.CENTER;
    textLabel.verticalAlign = cc.Label.VerticalAlign.CENTER;
    textLabel.fontSize = 30;
    textLabel.string = text;

    //当文本宽度过长时，设置为自动换行格式
    if (text.length * textLabel.fontSize > (width * 3) / 5){
        textNode.width = (width * 3) / 5;
        textLabel.overflow = cc.Label.Overflow.RESIZE_HEIGHT;
    }else {
        textNode.width = text.length * textLabel.fontSize;
    }
    let lineCount = ~~((text.length * textLabel.fontSize) / ((width * 3) / 5)) + 1;
    textNode.height = textLabel.fontSize * lineCount;

    //背景设置
    let ctx = bgNode.addComponent(cc.Graphics);
    ctx.arc(
        -textNode.width / 2,
        0,
        textNode.height / 2 + 20,
        0.5 * Math.PI,
        1.5*Math.PI,
        true
    );
    ctx.lineTo(textNode.width / 2, -(textNode.height / 2 + 20));
    ctx.arc(
        textNode.width / 2,
        0,
        textNode.height / 2 + 20,
        1.5 * Math.PI,
        0.5 * Math.PI,
        true
    );
    ctx.lineTo(-textNode.width / 2, textNode.height / 2 + 20);
    ctx.fillColor = bg_color;
    ctx.fill();

    bgNode.addChild(textNode);

    // gravity 设置Toast显示的位置
    if (gravity === "CENTER"){
        bgNode.y = 0;
        bgNode.x = 0;
    }else if (gravity === "TOP"){
        bgNode.y = bgNode.y + (height / 5) * 2;
    }else if (gravity === "BOTTOM"){
        bgNode.y = bgNode.y - (height / 5) * 2;
    }

    canvas.node.addChild(bgNode);

    let finished = cc.callFunc(function (){
        bgNode.destroy();
    });
    let action = cc.sequence(
        cc.moveBy(duration, cc.v2(0, 0)),
        cc.fadeOut(0.3),
        finished
    );
    bgNode.runAction(action);
}

module.exports = Toast;