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package com.bagri.server.hazelcast.stats;

import java.util.Date;
import java.util.HashMap;
import java.util.Map;

import com.bagri.support.stats.Statistics;
import com.bagri.support.stats.StatisticsEvent;
import com.bagri.support.util.DateUtils;

public class InvocationStatistics extends Statistics { 

	// stats indexes provided in alphabetical order
	public static final int idx_Avg_Time = 0;
	public static final int idx_Duration = 1;
	public static final int idx_Failed = 2;
	public static final int idx_First = 3;
	public static final int idx_Invoked = 4;
	public static final int idx_Last = 5;
	public static final int idx_Max_Time = 6;
	public static final int idx_Method = 7;
	public static final int idx_Min_Time = 8;
	public static final int idx_Succeed = 9;
	public static final int idx_Sum_Time = 10;
	public static final int idx_Throughput = 11;
	
	// stats names
	private static final String sn_Avg_Time = "Avg time";
	private static final String sn_Duration = "Duration";
	private static final String sn_Failed = "Failed";
	private static final String sn_First = "First";
	private static final String sn_Invoked = "Invoked";
	private static final String sn_Last = "Last";
	private static final String sn_Max_Time = "Max time";
	private static final String sn_Method = "Method"; 
	private static final String sn_Min_Time = "Min time";
	private static final String sn_Succeed = "Succeed";
	private static final String sn_Sum_Time = "Sum time";
	private static final String sn_Throughput = "Throughput";
		
	private static final String sn_Name = "invocation";
	private static final String sn_Header = "Method Invocation Statistics";
		
	private int cntInvoked;
	private int cntFailed;
	private int cntSucceed;
		
	private long tmMin = Long.MAX_VALUE;
	private long tmMax;
	private long tmSum;
	private long tmFirst = 0;
	private long tmLast;

	public InvocationStatistics(String name) {
		super(name);
	}
		
	@Override
	public String getDescription() {
		return sn_Header;
	}

	@Override
	public String getHeader() {
		return sn_Method;
	}
		
	@Override
	public String getName() {
		return sn_Name;
	}
		
	public void update(StatisticsEvent event) {
		cntInvoked++;
		long duration = (Long) event.getParam(0);
		tmSum += duration;
		if (duration < tmMin) {
			tmMin = duration;
		}
		if (duration > tmMax) {
			tmMax = duration;
		}
		if (event.isSuccess()) {
			cntSucceed++;
		} else {
			cntFailed++;
		}
		tmLast = event.getTimestamp();
		if (tmFirst == 0) {
			tmFirst = tmLast;
		}
	}
		
	@Override
	public Map toMap() {
		Map result = new HashMap(12);
		result.put(sn_First, new Date(tmFirst));
		result.put(sn_Last, new Date(tmLast));
		result.put(sn_Invoked, cntInvoked);
		result.put(sn_Failed, cntFailed);
		result.put(sn_Succeed, cntSucceed);
		result.put(sn_Max_Time, tmMax);
		result.put(sn_Sum_Time, tmSum);
		if (cntInvoked > 0) {
			result.put(sn_Min_Time, tmMin);
			double dSum = tmSum;
			double tmAvg = dSum/cntInvoked;
			result.put(sn_Avg_Time, tmAvg);
			double dCnt = 1000.0d;
			long tmDuration = tmLast - tmFirst + tmMin; //tmAvg;
			result.put(sn_Throughput, dCnt*cntInvoked/tmDuration);
			result.put(sn_Duration, tmDuration); //DateUtils.getDuration(tmLast - tmFirst));
		} else {
			result.put(sn_Min_Time, 0L);
			result.put(sn_Avg_Time, 0.0d);
			result.put(sn_Throughput, 0.0d);
			result.put(sn_Duration, 0L);
		}
		return result;
	}
		
	@Override
	public String toString() {
		StringBuilder buff = new StringBuilder(sn_Header).append(" [");
		buff.append(sn_First).append(colon).append(new Date(tmFirst)).append(semicolon);
		buff.append(sn_Last).append(colon).append(new Date(tmLast)).append(semicolon);
		buff.append(sn_Invoked).append(colon).append(cntInvoked).append(semicolon);
		buff.append(sn_Failed).append(colon).append(cntFailed).append(semicolon);
		buff.append(sn_Succeed).append(colon).append(cntSucceed).append(semicolon);
		buff.append(sn_Max_Time).append(colon).append(tmMax).append(semicolon);
		if (cntInvoked > 0) {
			buff.append(sn_Min_Time).append(colon).append(tmMin).append(semicolon);
			double dSum = tmSum;
			double tmAvg = dSum/cntInvoked;
			buff.append(sn_Avg_Time).append(colon).append(tmAvg).append(semicolon);
			double dCnt = cntInvoked*1000.0;
			long tmDuration = tmLast - tmFirst + tmMin; //tmAvg;
			buff.append(sn_Throughput).append(colon).append(dCnt/tmDuration).append(semicolon);
			buff.append(sn_Duration).append(colon).append(DateUtils.getDuration(tmDuration)).append(semicolon);
		} else {
			buff.append(sn_Min_Time).append(empty);
			buff.append(sn_Avg_Time).append(empty);
			buff.append(sn_Throughput).append(empty);
			buff.append(sn_Duration).append(empty);
		}
		buff.append(sn_Sum_Time).append(colon).append(tmSum);
		buff.append("]");
		return buff.toString();
	}

}