package btools.routingapp;

import java.io.File;

public class WpDatabaseScanner extends Thread {
  private String currentDir = "";
  private String bestGuess = "";
  private String lastError = "";

  private Object currentDirSync = new Object();

  private long maxtimestamp = 0;

  public String getCurrentDir() {
    synchronized (currentDirSync) {
      return currentDir;
    }
  }

  private void setCurrentDir(String dir) {
    synchronized (currentDirSync) {
      currentDir = dir;
    }
  }

  public String getBestGuess() {
    synchronized (currentDirSync) {
      return bestGuess;
    }
  }

  public String getLastError() {
    synchronized (currentDirSync) {
      return lastError;
    }
  }

  private void setLastError(String msg) {
    synchronized (currentDirSync) {
      lastError = msg;
    }
  }

  private static String[] vetos = new String[]{"dev", "sys", "system", "proc", "etc", "init", "d", "cache", "acct", "data"};

  private void scan(File dir, int level) {
    if (level > 8) {
      return;
    }

    try {
      if (dir.isDirectory()) {
        if (level == 1) {
          String name = dir.getName();
          for (String veto : vetos) {
            if (veto.equals(name)) {
              return;
            }
          }
        }

        testPath(dir.getPath());
        File[] childs = dir.listFiles();
        if (childs == null) {
          return;
        }
        for (File child : childs) {
          scan(child, level + 1);
        }
      }
    } catch (Exception e) {
      setLastError(e.toString());
    }
  }

  private void testPath(String path) throws Exception {
    setCurrentDir(path);

    testReader(new CoordinateReaderOsmAnd(path));
    testReader(new CoordinateReaderOsmAnd(path, true));
    testReader(new CoordinateReaderLocus(path));
    testReader(new CoordinateReaderOrux(path));
  }

  private void testReader(CoordinateReader cor) throws Exception {
    long ts = cor.getTimeStamp();
    if (ts > maxtimestamp) {
      maxtimestamp = ts;
      synchronized (currentDirSync) {
        bestGuess = cor.basedir;
      }
    } else if (ts > 0 && ts == maxtimestamp) {
      synchronized (currentDirSync) {
        if (cor.basedir.length() < bestGuess.length()) {
          bestGuess = cor.basedir;
        }
      }
    }
  }

  @Override
  public void run() {
    scan(new File("/"), 0);
    setCurrentDir(null);

  }
}