package com.zxt.dlna.util;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;

import com.zxt.dlna.util.DevMountInfo.DevInfo;

import android.os.Environment;

public class DevMountInfo implements IDev {
	/**
	 * ***
	 */
	public final String HEAD = "dev_mount";
	public final String LABEL = "<label>";
	public final String MOUNT_POINT = "<mount_point>";
	public final String PATH = "<part>";
	public final String SYSFS_PATH = "<sysfs_path1...>";

	/**
	 * Label for the volume
	 */
	private final int NLABEL = 1;
	/**
	 * Partition
	 */
	private final int NPATH = 2;
	/**
	 * Where the volume will be mounted
	 */
	private final int NMOUNT_POINT = 3;
	private final int NSYSFS_PATH = 4;

	private final int DEV_INTERNAL = 0;
	private final int DEV_EXTERNAL = 1;

	private ArrayList<String> cache = new ArrayList<String>();

	private static DevMountInfo dev;
	private DevInfo info;

	private final File VOLD_FSTAB = new File(Environment.getRootDirectory()
			.getAbsoluteFile()
			+ File.separator
			+ "etc"
			+ File.separator
			+ "vold.fstab");

	public static DevMountInfo getInstance() {
		if (null == dev)
			dev = new DevMountInfo();
		return dev;
	}

	private DevInfo getInfo(final int device) {
		// for(String str:cache)
		// System.out.println(str);

		if (null == info)
			info = new DevInfo();

		try {
			initVoldFstabToCache();
		} catch (IOException e) {
			e.printStackTrace();
		}

		if (device >= cache.size())
			return null;
		String[] sinfo = cache.get(device).split(" ");

		info.setLabel(sinfo[NLABEL]);
		info.setMount_point(sinfo[NMOUNT_POINT]);
		info.setPath(sinfo[NPATH]);
		info.setSysfs_path(sinfo[NSYSFS_PATH]);

		return info;
	}

	/**
	 * init the words into the cache array
	 * 
	 * @throws IOException
	 */
	private void initVoldFstabToCache() throws IOException {
		cache.clear();
		BufferedReader br = new BufferedReader(new FileReader(VOLD_FSTAB));
		String tmp = null;
		while ((tmp = br.readLine()) != null) {
			// the words startsWith "dev_mount" are the SD info
			if (tmp.startsWith(HEAD)) {
				cache.add(tmp);
			}
		}
		br.close();
		cache.trimToSize();
	}

	public class DevInfo {
		private String label, mount_point, path, sysfs_path;

		/**
		 * return the label name of the SD card
		 * 
		 * @return
		 */
		public String getLabel() {
			return label;
		}

		private void setLabel(String label) {
			this.label = label;
		}

		/**
		 * the mount point of the SD card
		 * 
		 * @return
		 */
		public String getMount_point() {
			return mount_point;
		}

		private void setMount_point(String mount_point) {
			this.mount_point = mount_point;
		}

		/**
		 * SD mount path
		 * 
		 * @return
		 */
		public String getPath() {
			return path;
		}

		private void setPath(String path) {
			this.path = path;
		}

		/**
		 * "unknow"
		 * 
		 * @return
		 */
		public String getSysfs_path() {
			return sysfs_path;
		}

		private void setSysfs_path(String sysfs_path) {
			this.sysfs_path = sysfs_path;
		}

	}

	@Override
	public DevInfo getInternalInfo() {
		return getInfo(DEV_INTERNAL);
	}

	@Override
	public DevInfo getExternalInfo() {
		return getInfo(DEV_EXTERNAL);
	}
}

interface IDev {
	DevInfo getInternalInfo();

	DevInfo getExternalInfo();
}