/*
 * Copyright 2009 Cedric Priscal
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License. 
 */

package android_serialport_api;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileDescriptor;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;

import android.util.Log;

public class SerialPort {

	private static final String TAG = "SerialPort";

	/*
	 * Do not remove or rename the field mFd: it is used by native method close();
	 */
	private FileDescriptor mFd;
	private FileInputStream mFileInputStream;
	private FileOutputStream mFileOutputStream;

	public SerialPort(File device, int baudrate, int flags) throws SecurityException, IOException {

		/* Check access permission */
		if (!device.canRead() || !device.canWrite()) {

			try {
				Log.e(TAG, "1============================");
				// Missing read/write permission, trying to chmod the file 
				Process su;
				su = Runtime.getRuntime().exec("/system/xbin/su");
				//String cmd = "chmod 666 " + device.getAbsolutePath() + "\n"
				//+ "exit\n";
				String cmd = "chmod 666 " + device.getAbsolutePath();
				Log.e(TAG, "cmd====================="+cmd);
				Runtime.getRuntime().exec(cmd);
				//su.getOutputStream().write(cmd.getBytes());
				if (/*(su.waitFor() != 0) || */!device.canRead()
						|| !device.canWrite()) {
					Log.e(TAG, "2=====================");
					throw new SecurityException();
				}
			} catch (Exception e) {
				Log.e(TAG, "3=================");
				e.printStackTrace();
				throw new SecurityException();
			}

			//do_exec("su root\n");
			//Log.e(TAG, "=============cmd : "+device.getAbsolutePath());
			//do_exec("chmod 755 " + device.getAbsolutePath() + "\n");
			//do_exec("rm /sdcard/123");
			//Runtime.getRuntime().exec("/system/xbin/su");
			//Runtime.getRuntime().exec("chmod 755 /dev/ttyS1");

		}

		mFd = open(device.getAbsolutePath(), baudrate, flags);
		if (mFd == null) {
			Log.e(TAG, "native open returns null");
			throw new IOException();
		}
		mFileInputStream = new FileInputStream(mFd);
		mFileOutputStream = new FileOutputStream(mFd);
	}

	// Getters and setters
	public InputStream getInputStream() {
		return mFileInputStream;
	}

	public OutputStream getOutputStream() {
		return mFileOutputStream;
	}

	String do_exec(String cmd) {
		String s = "/n";
		try {
			Process p = Runtime.getRuntime().exec(cmd);
			BufferedReader in = new BufferedReader(
					new InputStreamReader(p.getInputStream()));
			String line = null;
			while ((line = in.readLine()) != null) {
				s += line + "/n";
			}
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}

		return cmd;
	}

	// JNI 
	private native static FileDescriptor open(String path, int baudrate, int flags);
	public native void close();
	static {
		try {
			System.loadLibrary("serial_port");
		} catch (Exception e) {
			e.printStackTrace();
		}catch (Throwable e) {
			e.printStackTrace();
		}
	}



	/*
	 * iD pos机
	 */
	public SerialPort(String dev, int baudrate, int flags)
			throws IOException
	{
		OpenSerialPort(new File(dev), baudrate, flags);
	}

	private void OpenSerialPort(File device, int baudrate, int flags) throws IOException {
		this.mFd = open(device.getAbsolutePath(), baudrate, flags);
		if (this.mFd == null) {
			Log.e("SerialPort", "native open returns null");
			throw new IOException();
		}
		this.mFileInputStream = new FileInputStream(this.mFd);
		this.mFileOutputStream = new FileOutputStream(this.mFd);
	}
}