/*
 * Copyright (c) 2012-2013 NetEase, Inc. and other contributors
 *
 *  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 com.netease.qa.emmagee.utils;

import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.RandomAccessFile;
import java.text.DecimalFormat;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Calendar;

import com.netease.qa.emmagee.service.EmmageeService;

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

/**
 * operate CPU information
 * 
 * @author andrewleo
 */
public class CpuInfo {

	private static final String LOG_TAG = "Emmagee-"
			+ CpuInfo.class.getSimpleName();

	private Context context;
	private long processCpu;
	private long idleCpu;
	private long totalCpu;
	private boolean isInitialStatics = true;
	private SimpleDateFormat formatterFile;
	private MemoryInfo mi;
	private long totalMemorySize;
	private long initialTraffic;
	private long lastestTraffic;
	private long traffic;
	private TrafficInfo trafficInfo;
	private ArrayList<String> cpuUsedRatio;
	private long totalCpu2;
	private long processCpu2;
	private long idleCpu2;
	private String processCpuRatio = "";
	private String totalCpuRatio = "";
	private int pid;

	public CpuInfo(Context context, int pid, String uid) {
		this.pid = pid;
		this.context = context;
		trafficInfo = new TrafficInfo(uid);
		formatterFile = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
		mi = new MemoryInfo();
		totalMemorySize = mi.getTotalMemory();
		cpuUsedRatio = new ArrayList<String>();
	}

	/**
	 * read the status of CPU.
	 * 
	 * @throws FileNotFoundException
	 */
	public void readCpuStat() {
		String processPid = Integer.toString(pid);
		String cpuStatPath = "/proc/" + processPid + "/stat";
		try {
			// monitor cpu stat of certain process
			RandomAccessFile processCpuInfo = new RandomAccessFile(cpuStatPath,
					"r");
			String line = "";
			StringBuffer stringBuffer = new StringBuffer();
			stringBuffer.setLength(0);
			while ((line = processCpuInfo.readLine()) != null) {
				stringBuffer.append(line + "\n");
			}
			String[] tok = stringBuffer.toString().split(" ");
			processCpu = Long.parseLong(tok[13]) + Long.parseLong(tok[14]);
			processCpuInfo.close();
		} catch (FileNotFoundException e) {
			Log.e(LOG_TAG, "FileNotFoundException: " + e.getMessage());
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}

		try {
			// monitor total and idle cpu stat of certain process
			RandomAccessFile cpuInfo = new RandomAccessFile("/proc/stat", "r");
			String[] toks = cpuInfo.readLine().split("\\s+");
			idleCpu = Long.parseLong(toks[4]);
			totalCpu = Long.parseLong(toks[1]) + Long.parseLong(toks[2])
					+ Long.parseLong(toks[3]) + Long.parseLong(toks[4])
					+ Long.parseLong(toks[6]) + Long.parseLong(toks[5])
					+ Long.parseLong(toks[7]);
			cpuInfo.close();
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
	}

	/**
	 * get CPU name.
	 * 
	 * @return CPU name
	 */
	public String getCpuName() {
		try {
			RandomAccessFile cpuStat = new RandomAccessFile("/proc/cpuinfo",
					"r");
			String[] cpu = cpuStat.readLine().split(":"); // cpu信息的前一段是含有processor字符串，此处替换为不显示
			cpuStat.close();
			return cpu[1];
		} catch (IOException e) {
			Log.e(LOG_TAG, "IOException: " + e.getMessage());
		}
		return "";
	}

	/**
	 * reserve used ratio of process CPU and total CPU, meanwhile collect
	 * network traffic.
	 * 
	 * @return network traffic ,used ratio of process CPU and total CPU in
	 *         certain interval
	 */
	public ArrayList<String> getCpuRatioInfo(String totalBatt,
			String currentBatt, String temperature, String voltage) {

		DecimalFormat fomart = new DecimalFormat();
		fomart.setMaximumFractionDigits(2);
		fomart.setMinimumFractionDigits(2);

		readCpuStat();
		cpuUsedRatio.clear();

		try {
			String mDateTime2;
			Calendar cal = Calendar.getInstance();
			if ((Build.MODEL.equals("sdk"))
					|| (Build.MODEL.equals("google_sdk"))) {
				mDateTime2 = formatterFile.format(cal.getTime().getTime() + 8
						* 60 * 60 * 1000);
				totalBatt = "N/A";
				currentBatt = "N/A";
				temperature = "N/A";
				voltage = "N/A";
			} else
				mDateTime2 = formatterFile.format(cal.getTime().getTime());

			if (isInitialStatics) {
				initialTraffic = trafficInfo.getTrafficInfo();
				isInitialStatics = false;
			} else {
				lastestTraffic = trafficInfo.getTrafficInfo();
				if (initialTraffic == -1)
					traffic = -1;
				else
					traffic = (lastestTraffic - initialTraffic + 1023) / 1024;
				processCpuRatio = fomart
						.format(100 * ((double) (processCpu - processCpu2) / ((double) (totalCpu - totalCpu2))));
				totalCpuRatio = fomart
						.format(100 * ((double) ((totalCpu - idleCpu) - (totalCpu2 - idleCpu2)) / (double) (totalCpu - totalCpu2)));
				long pidMemory = mi.getPidMemorySize(pid, context);
				String pMemory = fomart.format((double) pidMemory / 1024);
				long freeMemory = mi.getFreeMemorySize(context);
				String fMemory = fomart.format((double) freeMemory / 1024);
				String percent = "统计出错";
				if (totalMemorySize != 0) {
					percent = fomart
							.format(((double) pidMemory / (double) totalMemorySize) * 100);
				}

				// whether certain device supports traffic statics or not
				if (traffic == -1) {
					EmmageeService.bw.write(mDateTime2 + "," + pMemory + ","
							+ percent + "," + fMemory + "," + processCpuRatio
							+ "," + totalCpuRatio + "," + "本程序或本设备不支持流量统计"
							+ "," + totalBatt + "," + currentBatt + ","
							+ temperature + "," + voltage + "\r\n");
				} else {
					EmmageeService.bw.write(mDateTime2 + "," + pMemory + ","
							+ percent + "," + fMemory + "," + processCpuRatio
							+ "," + totalCpuRatio + "," + traffic + ","
							+ totalBatt + "," + currentBatt + "," + temperature
							+ "," + voltage + "\r\n");
				}
			}
			totalCpu2 = totalCpu;
			processCpu2 = processCpu;
			idleCpu2 = idleCpu;
			cpuUsedRatio.add(processCpuRatio);
			cpuUsedRatio.add(totalCpuRatio);
			cpuUsedRatio.add(String.valueOf(traffic));
		} catch (IOException e) {
			e.printStackTrace();
			// PttService.closeOpenedStream()
		}
		return cpuUsedRatio;
	}
}