package com.novelbook.android.netapi;

import java.util.Random;


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

public class RandomHost {

	private static final int MAX = 5;
	private static final Random random = new Random();
	//private static final Map<String, int[]> indexsMap = new HashMap<String, int[]>();

	private JSONObject hosts = null;
	private String uri = null;
	
	private int[] indexs = new int[10];
	
	public RandomHost(JSONObject hosts, String uri) throws JSONException {
		this.hosts = hosts;
		this.uri = uri;
		String hostName = UrlFactory.getHost(uri);
		indexs = new int[MAX];
		JSONArray us = hosts.getJSONArray(hostName);
		int maxFixIndex = us == null ||us.length()==0 ? 0 :us.length();
		if (maxFixIndex > 0) {
			randomFill(indexs, 0, 0, maxFixIndex - 1);
		}
		for (int i = maxFixIndex; i < MAX; i++) {
			indexs[i] = i;
		}
		//randomFill(indexs, maxFixIndex, maxFixIndex, MAX - 1);
	}
	
	private static boolean in(int[] values, int maxIndex, int value) {
		for (int i = 0; i <= maxIndex; i++) {
			if (values[i] == value) return true;
 		}
		
		return false;
	}
	
	private static void randomFill(int[] indexs, int fromIndex, int min, int max) {
		for (int i = min; i <= max; i++) {
			while (true) {
				int value = random.nextInt(max + 1);
				if (value < min) continue;
				if (in(indexs, fromIndex + i - min - 1, value)) continue;
				indexs[ fromIndex + i - min] = value;
				break;
			}
		}
	}
	
	private int currentIndex = 0;
	public String next() {
		if (indexs == null || indexs.length == 0) return "";
		if (currentIndex >= indexs.length) {
			return "";
		}
		else {
			try {
				return UrlFactory.getUrl(hosts, uri, indexs[currentIndex++]);
			} catch (JSONException e) {
				e.printStackTrace();
			}
		}
		return "";
	}
}