package com.edufound.reader.util;

import android.content.Context;
import android.os.Environment;
import android.util.Log;

import com.chivox.AIEngine;

import org.json.JSONException;
import org.json.JSONObject;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.security.MessageDigest;
import java.util.Arrays;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;

//import org.apache.http.HttpResponse;
//import org.apache.http.NameValuePair;
//import org.apache.http.client.HttpClient;
//import org.apache.http.client.entity.UrlEncodedFormEntity;
//import org.apache.http.client.methods.HttpPost;
//import org.apache.http.impl.client.DefaultHttpClient;
//import org.apache.http.message.BasicNameValuePair;
//import org.apache.http.params.BasicHttpParams;
//import org.apache.http.util.EntityUtils;

public class AIEngineHelper {

	private static String TAG = "AIEngineHelper";
	private static int BUFFER_SIZE = 4096;

	private static String readFileAsString(File file) throws IOException {
		String line;
		StringBuffer sb = new StringBuffer();
		BufferedReader br = new BufferedReader(new FileReader(file));
		while ((line = br.readLine()) != null) {
			sb.append(line);
		}

		br.close();
		return sb.toString();
	}

	private static void writeFileAsString(File file, String str) throws IOException {
		FileWriter fw = new FileWriter(file);
		fw.write(str);
		fw.close();
	}

	private static void writeFileAsBytes(File file, byte [] bytes) throws IOException {
		FileOutputStream fstream = new FileOutputStream(file);
		BufferedOutputStream stream = new BufferedOutputStream(fstream);
		stream.write(bytes);
		stream.close();
		fstream.close();
	}

	private static void removeDirectory(File directory) {
		if (directory.isDirectory()) {
			File[] files = directory.listFiles();
			for (int i = 0; i < files.length; i++) {
				if (files[i].isDirectory()) {
					removeDirectory(files[i]);
				}
				files[i].delete();
			}
			directory.delete();
		}
	}

	/**
	 * extract resource once, the resource should in zip formatting
	 *
	 * @param context
	 * @param name
	 * @return return resource directory contains resources for native aiengine cores on success, otherwise return null
	 */
	public static String extractResourceOnce(Context context, String name, boolean unzip) {

		try {
			if (unzip) {
				String pureName = name.replaceAll("\\.[^.]*$", "");

				File filesDir = getFilesDir(context);
				File targetDir = new File(filesDir, pureName);

				String md5sum = md5sum(context.getAssets().open(name));

				File md5sumFile = new File(targetDir, ".md5sum");
				if (targetDir.isDirectory()) {
					if (md5sumFile.isFile()) {
						String md5sum2 = readFileAsString(md5sumFile);
						if (md5sum2.equals(md5sum)) {
							return targetDir.getAbsolutePath(); /* already extracted */
						}
					}

					removeDirectory(targetDir); /* remove old dirty resource */
				}

				unzip(context.getAssets().open(name), targetDir);
				writeFileAsString(md5sumFile, md5sum);

				return targetDir.getAbsolutePath();
			} else {
				File targetFile = new File(getFilesDir(context), name);
				copyInputStreamToFile(context.getAssets().open(name), targetFile);
				return targetFile.getAbsolutePath();
			}
		} catch (Exception e) {
			Log.e(TAG, "failed to extract resource", e);
		}

		return null;
	}

	/**
	 * register device once
	 * @param appKey
	 * @param secretKey
	 * @param userId
	 * @return return serialNumber on success, otherwise return null
	 */
	public static String registerDeviceOnce(Context context, String appKey, String secretKey, String userId) {
		File filesDir = getFilesDir(context);
		File serialNumberFile = new File(filesDir, "aiengine.serial");
		String serialNumber = "";
		String serialNumberInfo = "";
		if (serialNumberFile.isFile()) {
			try {
				serialNumber = readFileAsString(serialNumberFile);
				Log.d(TAG, "yes");
				return serialNumber;
			} catch (IOException e) {
				/* ignore */
			}
		}
		String sig = String.format("{\"appKey\":\"%s\",\"secretKey\":\"%s\",\"userId\":\"%s\"}", appKey,secretKey,userId);
		JSONObject sig_json = null;
		try {
			sig_json = new JSONObject(sig);
		} catch (JSONException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		byte cfg_b[] = Arrays.copyOf(sig_json.toString().getBytes(), 1024);
		int ret = AIEngine.aiengine_opt(0, 6, cfg_b, 1024);
		if (ret > 0) {
			serialNumberInfo = new String(cfg_b, 0, ret);
		} else {
			serialNumberInfo = new String(cfg_b);
		}
		try {
			serialNumber = (new JSONObject(serialNumberInfo)).getString("serialNumber");
		} catch (JSONException e1) {
			// TODO Auto-generated catch block
			e1.printStackTrace();
			return "";
		}
		if(serialNumber.length()==0){
			return "";
		}
		try {
			writeFileAsString(serialNumberFile, serialNumber);
		} catch (Exception e1) {
			/* ignore */
		}
		return serialNumber;
	}

	public static File getFilesDir(Context context) {

		File targetDir = null;

		if(Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
			// targetDir = context.getExternalFilesDir(null); // not support android 2.1
			targetDir = new File(Environment.getExternalStorageDirectory(), "Android/data/" + context.getApplicationInfo().packageName + "/files");
			if (!targetDir.exists()) {
				targetDir.mkdirs();
			}
		}

		if (targetDir == null || !targetDir.exists()) {
			targetDir = context.getFilesDir();
		}

		return targetDir;
	}

	private static void unzip(InputStream is, File targetDir)
			throws IOException {

		ZipInputStream zis = new ZipInputStream(new BufferedInputStream(is,
				BUFFER_SIZE));

		ZipEntry ze;
		while ((ze = zis.getNextEntry()) != null) {
			if (ze.isDirectory()) {
				new File(targetDir, ze.getName()).mkdirs();
			} else {

				File file = new File(targetDir, ze.getName());
				File parentdir = file.getParentFile();
				if (parentdir != null && (!parentdir.exists())) {
					parentdir.mkdirs();
				}

				int pos;
				byte[] buf = new byte[BUFFER_SIZE];
				OutputStream bos = new FileOutputStream(file);
				while ((pos = zis.read(buf, 0, BUFFER_SIZE)) > 0) {
					bos.write(buf, 0, pos);
				}
				bos.flush();
				bos.close();

				Log.d(TAG, file.getAbsolutePath());
			}
		}

		zis.close();
		is.close();
	}

	private static void copyInputStreamToFile(InputStream is, File file)
			throws Exception {
		int bytes;
		byte[] buf = new byte[BUFFER_SIZE];

		FileOutputStream fos = new FileOutputStream(file);
		while ((bytes = is.read(buf, 0, BUFFER_SIZE)) > 0) {
			fos.write(buf, 0, bytes);
		}

		is.close();
		fos.close();
	};

	private static String sha1(String message) {
		try {
			MessageDigest md = MessageDigest.getInstance("SHA-1");
			md.update(message.getBytes(), 0, message.length());
			return bytes2hex(md.digest());
		} catch (Exception e) {
			/* ignore */
		}
		return null;
	}

	private static String bytes2hex(byte[] bytes) {
		StringBuffer sb = new StringBuffer(bytes.length * 2);
		for (int i = 0; i < bytes.length; i++) {
			int v = bytes[i] & 0xff;
			if (v < 16) {
				sb.append('0');
			}
			sb.append(Integer.toHexString(v));
		}
		return sb.toString();
	}

	private static String md5sum(InputStream is) {
		int bytes;
		byte buf[] = new byte[BUFFER_SIZE];
		try {
			MessageDigest md = MessageDigest.getInstance("MD5");
			while ((bytes = is.read(buf, 0, BUFFER_SIZE)) > 0) {
				md.update(buf, 0, bytes);
			}
			is.close();
			return bytes2hex(md.digest());
		} catch (Exception e) {
			/* ignore */
		}
		return null;
	}

	public static String getProvisionTmpFile(Context context)
	{
		File filesDir = getFilesDir(context);
		String str = filesDir.getAbsolutePath() + "/aiengine.provision.temp";

		Log.d(TAG, "provison tmp file path: " + str);

		return str;
	}
}