package com.espressif.iot.esptouch.util;

import java.net.InetAddress;
import java.net.UnknownHostException;

import android.content.Context;
import android.net.wifi.WifiInfo;
import android.net.wifi.WifiManager;
import android.util.Log;
public class EspNetUtil {

	/**
	 * get the local ip address by Android System
	 *
	 * @param context
	 *            the context
	 * @return the local ip addr allocated by Ap
	 */
	public static InetAddress getLocalInetAddress(Context context) {
		WifiManager wm = (WifiManager) context
				.getSystemService(Context.WIFI_SERVICE);
		WifiInfo wifiInfo = wm.getConnectionInfo();
		int localAddrInt = wifiInfo.getIpAddress();
		String localAddrStr = __formatString(localAddrInt);
		InetAddress localInetAddr = null;
		try {
			localInetAddr = InetAddress.getByName(localAddrStr);
		} catch (UnknownHostException e) {
			e.printStackTrace();
		}
		return localInetAddr;
	}

	private static String __formatString(int value) {
		String strValue = "";
		byte[] ary = __intToByteArray(value);
		for (int i = ary.length - 1; i >= 0; i--) {
			strValue += (ary[i] & 0xFF);
			if (i > 0) {
				strValue += ".";
			}
		}
		return strValue;
	}

	private static byte[] __intToByteArray(int value) {
		byte[] b = new byte[4];
		for (int i = 0; i < 4; i++) {
			int offset = (b.length - 1 - i) * 8;
			b[i] = (byte) ((value >>> offset) & 0xFF);
		}
		return b;
	}

	/**
	 * parse InetAddress
	 *
	 * @param inetAddrBytes
	 * @return
	 */
	public static InetAddress parseInetAddr(byte[] inetAddrBytes, int offset,
			int count) {
		InetAddress inetAddress = null;
		StringBuilder sb = new StringBuilder();
		for (int i = 0; i < count; i++) {
			sb.append(Integer.toString(inetAddrBytes[offset + i] & 0xff));
			if (i != count-1) {
				sb.append('.');
			}
		}
		try {
			inetAddress = InetAddress.getByName(sb.toString());
		} catch (UnknownHostException e) {
			e.printStackTrace();
		}
		return inetAddress;
	}

	/**
	 * parse bssid
	 *
	 * @param bssid the bssid
	 * @return byte converted from bssid
	 */
	public static byte[] parseBssid2bytes(String bssid) {
		String bssidSplits[] = bssid.split(":");
		if(bssidSplits.length < 8) {
			return new byte[0];
		}
		byte[] result = new byte[bssidSplits.length];
		for(int i = 0;i < bssidSplits.length; i++) {
			result[i] = (byte) Integer.parseInt(bssidSplits[i], 16);
		}
		return result;
	}
}