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package com.github.segmentio.stats;

import java.util.concurrent.ConcurrentHashMap;

public class Statistics extends ConcurrentHashMap {

	private static final long serialVersionUID = -8837006750327885446L;
	
	public Statistic ensure(String key) {
		if (this.containsKey(key)) return this.get(key);

		Statistic statistic = new Statistic();
		this.put(key, statistic);
		return statistic;
	}
	
	public void update(String operation, double val) {
		if (!this.containsKey(operation)) {
			this.putIfAbsent(operation, new Statistic());
		}
		
		this.get(operation).update(val);
	}
	
	@Override
	public String toString() {
		
		StringBuilder builder = new StringBuilder();
		
		builder.append("\n-------- Safe Client Statistics --------\n");
		
		for (Entry entry : entrySet()) {
			
			String operation = entry.getKey();
			Statistic statistic = entry.getValue();
			
			builder.append(String.format("%s : %s\n", operation, statistic.toString()));
		}
		
		builder.append("----------------------------------------\n");
		
		return builder.toString();
	}
	
}