package com.walker.infrastructure.utils;

import com.walker.infrastructure.ApplicationRuntimeException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.imageio.ImageIO;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;

public class ImageUtils {

    protected static final Logger logger = LoggerFactory.getLogger(ImageUtils.class);

    /***
     * 按指定的比例缩放图片
     *
     * @param sourceImagePath
     * 源地址
     * 改变大小后图片的地址
     * 缩放比例，如1.2
     * @return 返回压缩后的新文件路径
     * @date 2023-11-02
     */
    public static String scaleImage4Jpg(String sourceImagePath, double maxWidth) {
        File file = new File(sourceImagePath);
        BufferedImage bufferedImage = null;

        try {
            bufferedImage = ImageIO.read(file);
            int width = bufferedImage.getWidth();
            int height = bufferedImage.getHeight();
            if(width <= maxWidth){
                return sourceImagePath;
            }
            double scale = maxWidth / width;
            logger.debug("scale = {}", scale);
            width = parseDoubleToInt(width * scale);
            height = parseDoubleToInt(height * scale);

            Image image = bufferedImage.getScaledInstance(width, height, Image.SCALE_SMOOTH);

            BufferedImage outputImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
            Graphics graphics = outputImage.getGraphics();
            graphics.drawImage(image, 0, 0, null);
            graphics.dispose();

            String destinationPath = FileUtils.getThumbNailsName(sourceImagePath);
            ImageIO.write(outputImage, IMAGE_JPG, new File(destinationPath));
            return destinationPath;

        } catch (IOException e) {
            logger.error("scaleImage方法压缩图片时出错:" + e.getMessage() + ", file=" + sourceImagePath, e);
            throw new ApplicationRuntimeException("压缩图片错误：" + sourceImagePath, e);
        } finally {

        }
    }

    private static int parseDoubleToInt(double sourceDouble) {
        int result = 0;
        return  (int) sourceDouble;
    }

    public static final String IMAGE_JPG = "jpg";
}