#include "texturecrafter.h"

TextureCrafter::TextureCrafter(QObject *parent)
    : QObject{parent}
{}

QUrl TextureCrafter::packChannels(QVector<QUrl> imagePaths) {

    QVector<QImage> sourceImages;
    int width = 0, height = 0;
    QImage::Format format = QImage::Format_RGB888;

    for (int i = 0; i < imagePaths.length(); i++) {
        // if the ui layer did its job this will always be a file:// url
        QString rawPath = imagePaths[i].toLocalFile();
        QImage newImage(rawPath); // would this cause a use after free idk

        // we just use the first image's dimensions and force the others to conform hehe
        if (width == 0) {
            width = newImage.width();
        }
        if (height == 0) {
            height = newImage.height();
        }

        sourceImages.append(newImage);
    }

    QImage outImage(width, height, format);

    // do the channel packing!!
    // theres probably a faster way to do this but eh
    for (int i = 0; i < width; i++) {
        for (int j = 0; j < height; j++) {
            int r, g, b;

            // too eepy for dry
            r = sourceImages.at(0).pixelColor(i, j).red();
            g = sourceImages.at(1).pixelColor(i, j).green();
            b = sourceImages.at(2).pixelColor(i, j).blue();

            QColor newColor(r, g, b);

            outImage.setPixelColor(i, j, newColor);
        }
    }

    // write it to a temp file
    if (outDir.isValid()) {
        QString outFileName = outDir.path();
        outFileName.append("/out.png");

        printf("writing to %s\n", outFileName.toLatin1().data());

	//TODO: use libpng and do progressive write to update the progress bar
        if (outImage.save(outFileName)) {
            printf("cool ^-^\n");
            return QUrl::fromLocalFile(outFileName);
        } else {
            //TODO: return some error value to show the user
            printf("that dream is fucked it is fucking fucked (write failed ;-;)\n");
        }
    } else {
        printf("chat its so over (output dir invalid </3)\n");
    }

    return QUrl();
    //do we need to close these??? idk lets hope qt handles it
}