package org.jeecg.modules.dry.util;

import ai.djl.Device;
import ai.djl.Model;
import ai.djl.inference.Predictor;
import ai.djl.modality.Classifications;
import ai.djl.modality.cv.Image;
import ai.djl.modality.cv.ImageFactory;
import ai.djl.modality.cv.transform.*;
import ai.djl.modality.cv.translator.ImageClassificationTranslator;
import ai.djl.translate.Translator;
import org.springframework.stereotype.Component;

import javax.imageio.ImageIO;
import javax.imageio.stream.ImageOutputStream;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.*;
import java.util.ArrayList;
import java.util.List;

@Component
public class HerbUtil {
 
    //规定输入尺寸
    private static final int INPUT_SIZE = 224;

    private static final int TARGET_SIZE = 256;
 
    //标签文件 一种类别名字占一行
    private List<String> herbNames;
 
    //用于识别
    Predictor<Image, Classifications> predictor;
 
    //模型
    private Model model;
 
    public HerbUtil() {
        //加载标签到herbNames中
        this.loadHerbNames();
        //初始化模型工作
        this.init();



    }

    public List<Classifications.Classification> predict(InputStream inputStream) {
        List<Classifications.Classification> result = new ArrayList<>();
        Image input = this.resizeImage(inputStream);
        try {
            Classifications output = predictor.predict(input);
            System.out.println("推测为：" + output.best().getClassName()
                    + ", 概率：" + output.best().getProbability());
            System.out.println(output);
            result = output.topK();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return result;
    }

    private void loadHerbNames() {
        BufferedReader reader = null;
        herbNames = new ArrayList<>();
        try {
            InputStream in = HerbUtil.class.getClassLoader().getResourceAsStream("class.txt");
            reader = new BufferedReader(new InputStreamReader(in));
            String name = null;
            while ((name = reader.readLine()) != null) {
                herbNames.add(name);
            }
            System.out.println(herbNames);
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (reader != null) {
                try {
                    reader.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }

    private void init() {
        Translator<Image, Classifications> translator = ImageClassificationTranslator.builder()
                //下面的transform根据自己的改
                .addTransform(new CenterCrop(INPUT_SIZE,INPUT_SIZE))

                .addTransform(new ToTensor())
                .addTransform(new Normalize(
                        new float[] {0.485f, 0.456f, 0.406f},
                        new float[] {0.229f, 0.224f, 0.225f}))

                //载入所有标签进去
                .optSynset(herbNames)
                //最终显示概率最高的5个
                .optTopK(5)
                .build();
        //随便起名
        Model model = Model.newInstance("model", Device.cpu());
        try {
            InputStream inputStream = HerbUtil.class.getClassLoader().getResourceAsStream("model1.pt");
            if (inputStream == null) {
                throw new RuntimeException("找不到模型文件");
            }
            model.load(inputStream);

            predictor = model.newPredictor(translator);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    private Image resizeImage(InputStream inputStream) {
        BufferedImage input = null;
        try {
            input = ImageIO.read(inputStream);
        } catch (IOException e) {
            e.printStackTrace();
        }
        int iw = input.getWidth(), ih = input.getHeight();
        int w = 256, h = 256;
        double scale = Math.max(1. *  w / iw, 1. * h / ih);
        int nw = (int) (iw * scale), nh = (int) (ih * scale);
        java.awt.Image img;
        //只有太长或太宽才会保留横纵比，填充颜色
       // boolean needResize = 1. * iw / ih > 1.4 || 1. * ih / iw > 1.4;
      //  if (needResize) {
            img = input.getScaledInstance(nw, nh, BufferedImage.SCALE_SMOOTH);
      //  } else {
       //     img = input.getScaledInstance(INPUT_SIZE, INPUT_SIZE, BufferedImage.SCALE_SMOOTH);
      //  }
        BufferedImage out = new BufferedImage(nw, nh, BufferedImage.TYPE_INT_RGB);
        Graphics g = out.getGraphics();
        //先将整个224*224区域填充128 128 128颜色
        g.setColor(new Color(255, 255, 255));
        g.fillRect(0, 0, nw, nh);
        out.getGraphics().drawImage(img, 0, 0, null);
        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
        try {
            ImageOutputStream imageOutputStream = ImageIO.createImageOutputStream(outputStream);
            ImageIO.write(out, "jpg", imageOutputStream);
            //去D盘看效果
            ImageIO.write(out, "jpg", new File("E:\\out.jpg"));
            InputStream is = new ByteArrayInputStream(outputStream.toByteArray());
            return ImageFactory.getInstance().fromInputStream(is);
        } catch (IOException e) {
            e.printStackTrace();
            throw new RuntimeException("图片转换失败");
        }
    }
}