#include "elemultipng.h"
#include <QJsonObject>
#include <QJsonArray>
#include <QPainter>
#include <QTimerEvent>

EleMultiPng::EleMultiPng(QString dirPre, QJsonArray maps, QWidget *parent) : QWidget{parent} {
    int len = maps.size();
    for(int i=0; i<len; i++) imgs.append(QPixmap(dirPre+maps[i].toObject()["id"].toString()));
    QJsonObject map = maps[0].toObject();
    picDur = map["picDuration"].toInt()*1000;
    EffDur = map["effectSpeed"].toInt()*1000;
    if(EffDur==0) return;
    QString effStr = map["effect"].toString();
    if(effStr.isEmpty() || effStr=="no") EffDur = 0;
    else if(effStr.endsWith("left")) effType = 'l';
    else if(effStr.endsWith("top")) effType = 't';
    else if(effStr.endsWith("right")) effType = 'r';
    else if(effStr.endsWith("bottom")) effType = 'b';
    else if(effStr == "random") needRand = true;
    else EffDur = 0;
}

void EleMultiPng::startMove() {
    if(EffDur==0) return;
    if(needRand) effType = effTypes[rand.generate() % 4];
    double effDurD = EffDur;
    if(effType=='l') {
        imgx = width();
        imgy = 0;
        effDurD /= width();
    } else if(effType=='r') {
        imgx = -width();
        imgy = 0;
        effDurD /= width();
    } else if(effType=='t') {
        imgx = 0;
        imgy = height();
        effDurD /= height();
    } else if(effType=='b') {
        imgx = 0;
        imgy = -height();
        effDurD /= height();
    } else return;
    moveInter = ceil(effDurD/16.666666)*16.666666;
    movePx = ceil(moveInter/effDurD);
    moveTimerId = startTimer(moveInter, Qt::PreciseTimer);
}

void EleMultiPng::paintEvent(QPaintEvent *) {
    if(timerId==0 && (EffDur!=0 || imgs.size()>1)) {
        timerId = startTimer(picDur, Qt::PreciseTimer);
        startMove();
    }
    QPainter painter(this);
    painter.setRenderHints(QPainter::Antialiasing|QPainter::SmoothPixmapTransform);
    painter.drawPixmap(imgx, imgy, imgs[imgc]);
}

void EleMultiPng::timerEvent(QTimerEvent *e) {
    if(isVisible()) {
        int id = e->timerId();
        if(id==timerId){
            if(imgc+2 > imgs.size()) imgc = 0;
            else imgc++;
            startMove();
        } else if(id==moveTimerId){
            if(effType=='l') {
                imgx -= movePx;
                if(imgx < 0) imgx = 0;
            } else if(effType=='t') {
                imgy -= movePx;
                if(imgy < 0) imgy = 0;
            } else if(effType=='r') {
                imgx += movePx;
                if(imgx > 0) imgx = 0;
            } else if(effType=='b') {
                imgy += movePx;
                if(imgy > 0) imgy = 0;
            }
            if(imgx==0 && imgy==0) {
                killTimer(moveTimerId);
                moveTimerId = 0;
            }
        }
        update();
    } else {
        if(timerId!=0) {
            killTimer(timerId);
            timerId = 0;
        }
        if(moveTimerId!=0) {
            killTimer(moveTimerId);
            moveTimerId = 0;
        }
    }
}