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package com.clickntap.tool.storage;

import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.zip.CRC32;

import org.apache.commons.io.FileUtils;
import org.springframework.core.io.Resource;

import com.clickntap.utils.ConstUtils;
import com.clickntap.utils.IOUtils;

public class Disk {

  private static final String MASTER = "master";
  private int DIR_NAME_MAX_LENGHT = 2;
  private File workFile;
  private String volumeName;
  private String dir;

  public String getVolumeName() {
    return volumeName;
  }

  public void setVolumeName(String volumeName) {
    this.volumeName = volumeName;
  }

  public void setWorkDir(Resource workDir) throws IOException {
    this.workFile = workDir.getFile();
  }

  public void setWorkFile(File workFile) {
    this.workFile = workFile;
  }

  public void start() throws Exception {
    File dir = workFile;
    if (!dir.isDirectory())
      throw new IOException("workDir must be a directory");
    FileUtils.forceMkdir(dir = new File(dir.getCanonicalPath() + ConstUtils.SLASH + volumeName));
    this.dir = dir.getCanonicalPath() + ConstUtils.SLASH;
  }

  public void store(Number id, InputStream in) throws Exception {
    store(id, MASTER, in);
  }

  public boolean exists(Number id) throws Exception {
    return exists(id, MASTER);
  }

  public void load(Number id, OutputStream out) throws Exception {
    load(id, MASTER, out);
  }

  public void delete(Number id) throws Exception {
    delete(id, MASTER);
  }

  public InputStream stream(Number id) throws Exception {
    return inputStream(id, MASTER);
  }

  public void store(Number id, String key, InputStream in) throws Exception {
    ByteArrayOutputStream bin = new ByteArrayOutputStream();
    IOUtils.copy(in, bin);
    CRC32 crc = new CRC32();
    crc.update(bin.toByteArray());
    OutputStream out = outputStream(id, key, crc.getValue());
    out.write(bin.toByteArray());
    out.close();
  }

  public InputStream inputStream(Number id, String key) throws Exception {
    return new FileInputStream(getFile(id, key));
  }

  public OutputStream outputStream(Number id, String key, long crc) throws Exception {
    File file = getFile(id, key);
    FileUtils.forceMkdir(file.getParentFile());
    return new FileOutputStream(getFile(id, key, crc));
  }

  public void load(Number id, String key, OutputStream out) throws Exception {
    InputStream in = inputStream(id, key);
    IOUtils.copy(in, out);
    in.close();
  }

  public boolean exists(Number id, String key) throws Exception {
    // System.out.println(getFile(id, key));
    return getFile(id, key).exists();
  }

  public void delete(Number id, String key) throws Exception {
    if (key.equals(MASTER)) {
      int x1;
      String filen;
      File parentFile = getFile(id, key).getParentFile();
      File[] files = parentFile.listFiles();
      if (files != null)
        for (File file : files) {
          x1 = file.getName().indexOf(ConstUtils.DOT);
          filen = file.getName().substring(0, x1);
          if (filen.equals(Long.toString(id.longValue())))
            file.delete();
        }
      files = parentFile.listFiles();
      if (files == null || files.length == 0)
        parentFile.delete();
    } else
      getFile(id, key).delete();
  }

  private File getFile(Number id, String key) {
    return new File(dir + toPath(Long.toString(id.longValue()), key, null));
  }

  private File getFile(Number id, String key, Long crc) {
    return new File(dir + toPath(Long.toString(id.longValue()), key, crc));
  }

  private String toPath(String n, String key, Long crc) {
    key = ConstUtils.MINUS + key;
    String path = ConstUtils.EMPTY;
    for (int i = 0; i < n.length(); i += DIR_NAME_MAX_LENGHT) {
      if (i != 0)
        path += ConstUtils.SLASH;
      if (i == n.length() - 1)
        path += n;
      else {
        if (i + DIR_NAME_MAX_LENGHT >= n.length())
          path += n;
        else
          path += n.substring(i, Math.min(i + DIR_NAME_MAX_LENGHT, n.length()));
      }
    }
    if (crc != null)
      path += ConstUtils.DOT + crc;
    else {
      int x1, x2;
      String filen, filekey;
      File parentFile = new File(dir + path).getParentFile();
      File[] files = parentFile.listFiles();
      if (files != null)
        for (File file : files) {
          if (!file.isDirectory()) {
            x1 = file.getName().indexOf(ConstUtils.DOT);
            x2 = file.getName().indexOf(ConstUtils.MINUS);
            filen = file.getName().substring(0, x1);
            filekey = file.getName().substring(x2);
            if (filen.equals(n) && filekey.equals(key))
              path += file.getName().substring(x1, x2);
          }
        }
    }
    path += key;
    return path;
  }
}