/*
    Dateiverwaltung - File management in your browser
    Copyright (C) 2017 Ulrich Hilger, http://uhilger.de

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU Affero General Public License as
    published by the Free Software Foundation, either version 3 of the
    License, or (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Affero General Public License for more details.

    You should have received a copy of the GNU Affero General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

package de.uhilger.filecms.api;

import de.uhilger.filecms.web.Initialiser;
import de.uhilger.filesystem.FileRef;
import de.uhilger.filesystem.LocalFileSystem;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.StringReader;
import java.security.Principal;
import java.util.ArrayList;
import java.util.List;
import java.util.logging.Level;
import java.util.logging.Logger;

/**
 *
 * @author ulrich
 */
public class FileMgr extends Api {
  private static final Logger logger = Logger.getLogger(FileMgr.class.getName());
  
  public static final String PUB_DIR_PATH = "www/";
  public static final String HOME_DIR_PATH = "home/";
  public static final String PUB_DIR_NAME = "Oeffentlich";
  public static final String HOME_DIR_NAME = "Persoenlicher Ordner";
  
  public String hallo() {
    return "Hallo Welt!";
  }
  
  public List<FileRef> list(String relPath) {
    List<FileRef> files = new ArrayList();
    if(relPath.length() == 0) {
      FileRef namedPublicFolder = new FileRef(PUB_DIR_NAME, true);
      logger.finer(namedPublicFolder.getAbsolutePath());
      FileRef namedHomeFolder = new FileRef(HOME_DIR_NAME, true);
      logger.finer(namedHomeFolder.getAbsolutePath());
      files = new ArrayList();
      files.add(namedHomeFolder);
      files.add(namedPublicFolder);
    } else {
      String path = getTargetDir(relPath).getAbsolutePath();
      logger.fine(path);
      LocalFileSystem fs = new LocalFileSystem();
      FileRef[] fileRefs = fs.list(new FileRef(getTargetDir(relPath).getAbsolutePath(), true));
      for(int i = 0; i < fileRefs.length; i++) {
        files.add(fileRefs[i]);
        logger.finer("added " + fileRefs[i].getAbsolutePath());
      }
    }    
    return files;
  }
  
  public FileRef newFolder(String relPath, String folderName) {
    logger.finer(relPath);
    String targetPath = null;
    if(relPath.startsWith(PUB_DIR_NAME)) {
      targetPath = PUB_DIR_PATH + getUserName() + "/" + relPath.substring(PUB_DIR_NAME.length()) + "/" + folderName;
    } else if(relPath.startsWith(HOME_DIR_NAME)) {
      targetPath = HOME_DIR_PATH + getUserName() + "/" + relPath.substring(HOME_DIR_NAME.length()) + "/" + folderName;
    } else {
      // kann eigentlich nicht sein..
    }
    logger.finer(targetPath);
    File targetDir = new File(getBase().getAbsolutePath(), targetPath);
    targetDir.mkdirs();
    return new FileRef(targetDir.getAbsolutePath(), true);
  }
  
  public String getCode(String relPath, String fileName) {
    String code = null;
    
    Object p = getRequest().getUserPrincipal();
    if(p instanceof Principal) {
      FileReader reader = null;
      try {
        File targetFile = new File(getTargetDir(relPath), fileName);
        reader = new FileReader(targetFile);
        StringBuffer buf = new StringBuffer();
        char[] readBuffer = new char[1024];
        int charsRead = reader.read(readBuffer);
        while(charsRead > -1) {
          buf.append(readBuffer, 0, charsRead);
          charsRead = reader.read(readBuffer);
        }
        code = buf.toString();
      } catch (FileNotFoundException ex) {
        Logger.getLogger(FileMgr.class.getName()).log(Level.SEVERE, null, ex);
      } catch (IOException ex) {
        Logger.getLogger(FileMgr.class.getName()).log(Level.SEVERE, null, ex);
      } finally {
        try {
          reader.close();
        } catch (IOException ex) {
          Logger.getLogger(FileMgr.class.getName()).log(Level.SEVERE, null, ex);
        }
      }
      
    }    
    
    return code;
  }
  
  public FileRef saveTextFile(String relPath, String fileName, String contents) {
    FileRef savedFile = null;
    try {
      FileRef datenRef = getBase();
      //File daten = new File(datenRef.getAbsolutePath());
      Object p = getRequest().getUserPrincipal();
      if(p instanceof Principal) {
        File targetFile = new File(getTargetDir(relPath), fileName);
        if(targetFile.exists()) {
          /*
            muss delete() sein?
            pruefen: ueberschreibt der FileWriter den alteen Inhalt oder 
            entsteht eine unerwuenschte Mischung aus altem und neuem 
            Inhalt?
          */
          targetFile.delete();
        } else {
          targetFile.getParentFile().mkdirs();
        }
        targetFile.createNewFile();
        FileWriter w = new FileWriter(targetFile);
        w.write(contents);
        w.flush();
        w.close();
        savedFile = new FileRef(
                targetFile.getAbsolutePath(), 
                targetFile.isDirectory(), 
                targetFile.isHidden(), 
                targetFile.lastModified(), 
                targetFile.length());
      }
    } catch (IOException ex) {
      logger.log(Level.SEVERE, null, ex);
    }
    return savedFile;
  }
    
  /* ---- Hilfsfunktionen ---- */
  
  private File getTargetDir(String relPath) {
    logger.finer(relPath);
    String targetPath = null;
    if(relPath.startsWith(PUB_DIR_NAME)) {
      targetPath = PUB_DIR_PATH + getUserName() + "/" + relPath.substring(PUB_DIR_NAME.length());
    } else if(relPath.startsWith(HOME_DIR_NAME)) {
      targetPath = HOME_DIR_PATH + getUserName() + "/" + relPath.substring(HOME_DIR_NAME.length());
    } else {
      // kann eigentlich nicht sein..
    }
    logger.finer(targetPath);
    File targetDir = new File(getBase().getAbsolutePath(), targetPath);
    return targetDir;
  }
  private FileRef getBase() {
    FileRef base = null;
    Object o = getServletContext().getAttribute(Initialiser.FILE_BASE);
    if(o instanceof FileRef) {
      base = (FileRef) o;
    }
    return base;
  }
  
  private String getUserName() {
    String userName = null;
    Object p = getRequest().getUserPrincipal();
    if(p instanceof Principal) {
      userName = ((Principal) p).getName();
    }
    return userName;
  }
  
  /*
  private File getWebappsDir() {
    File cfile = new File(this.getClass().getResource(
            this.getClass().getSimpleName() + ".class").getFile());
    String path = cfile.getAbsolutePath();
    return new File(path.substring(0, path.indexOf(getRequest().getContextPath())));
  }
  */
    
}