package project.web.api;

import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Properties;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.web.bind.annotation.CrossOrigin;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import kernel.util.ImageDispatcher;
import kernel.util.PropertiesLoaderUtils;

@RestController
@CrossOrigin
public class ShowImgController {

	public final String basePath = "/public/showimg";
	
	private static Properties properties = PropertiesLoaderUtils.loadProperties("config/system.properties");
	
	@RequestMapping(basePath+"!showImg.action")
	public void showImg(HttpServletRequest request,HttpServletResponse response) throws Exception {
		String imagePath=request.getParameter("imagePath");
		if(null==imagePath || (imagePath=imagePath.trim()).isEmpty()) return;
		responseFile(response, imagePath);
	}
	
	 /**
     * 响应输出图片文件
     * @param response
     * @param imgFile
     */
    private void responseFile(HttpServletResponse response, String imagePath) {
        try(InputStream is = getDownloadFile(imagePath);
            OutputStream os = response.getOutputStream();){
            byte [] buffer = new byte[1024]; // 图片文件流缓存池
            while(is.read(buffer) != -1){
                os.write(buffer);
            }
            os.flush();
        } catch (IOException ioe){
            ioe.printStackTrace();
        }
    }
    
	public InputStream getDownloadFile(String imagePath) throws FileNotFoundException {
		BufferedInputStream bis = null;
		try {
			boolean goback = false;
			File fl = null;
			if ((imagePath == null) || (imagePath.trim().length() <= 0)) {
				fl = new File(properties.getProperty("images.dir") + "noimage.jpg");
				goback = true;
			}
			if (!goback) {
				fl = ImageDispatcher.findFile(imagePath);
				if (fl == null) {
					fl = new File(properties.getProperty("images.dir") + "noimage.jpg");
				}
				if (!fl.exists()) {
					fl = new File(properties.getProperty("images.dir") + "noimage.jpg");
				}

			}

			FileInputStream fis = new FileInputStream(fl);
			bis = new BufferedInputStream(fis);
		} catch (Throwable e) {
			e.printStackTrace();
		}

		return bis;
	}
}