package de.mpiwg.gazetteer.utils;

import java.io.File;
import java.io.PrintWriter;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.UUID;

import org.apache.commons.lang.RandomStringUtils;
import org.apache.commons.lang.StringUtils;
import org.apache.log4j.Logger;

import de.mpiwg.gazetteer.bo.LGBranch;
import de.mpiwg.gazetteer.bo.LGFile;

public class FileManager {

	private static Logger logger = Logger.getLogger(FileManager.class);
	
	private static DateFormat dfmt = new SimpleDateFormat( "yyyy.MM.dd_hh.mm.ss.SSS" );

	
	
	private static String getRootPath() throws Exception{
		String base = PropertiesUtils.getPropValue("files_root");
		
		if(StringUtils.isEmpty(base)){
			throw new Exception("Property files_root no found. The files can be stored without this property.");
		}
		
		if(!base.endsWith("/")){
			base += "/";
		}
		
		logger.info("files_root=" + base);
		
		return base;
	}
	
	public static String saveFile(LGBranch branch, LGFile file, Date date) throws Exception{
				
		String absolutePath = getRootPath() + branch.getSectionId() + "/";
		String fileName = 
				branch.getSectionId() + "_" + 
				branch.getId() + "_"  + 
				file.getId() +  "_" + 
				dfmt.format(date) + 
				".txt";
		
		File folder = new File(absolutePath);
		folder.mkdirs();
		
		logger.info("Trying to save file " + absolutePath + fileName + ".");
		
		PrintWriter out = new PrintWriter(absolutePath + fileName);
		out.println(file.getContent());
		out.close();
		
		logger.info("The file " + fileName + " has been saved correctly.");
		return fileName;
	}
	
	public static String getFile(LGFile file) throws Exception{
		
		LGBranch branch = DataProvider.getInstance().getBranch(file.getBranchId());
		
		String absolutePath = getRootPath() + branch.getSectionId() + "/" + file.getFileName();
		System.out.println("Loading: " + absolutePath);
		byte[] encoded = Files.readAllBytes(Paths.get(absolutePath));
		return new String(encoded, "UTF8");
	}
	
	
}