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package com.pg.iterableRng;

import java.util.Iterator;
import java.util.NoSuchElementException;

public class RangePalindromeIterator implements Iterator<Integer> {
	int lastReturned; 
	int max;
	
	public RangePalindromeIterator(int min, int max) {
		this.lastReturned = isPalindrome(min) ? min : nextPal(min);
		this.max = max;
	}

	@Override
	public boolean hasNext() {
		return (lastReturned < max);
	}

	@Override
	public Integer next() {
		if(!hasNext())  throw new NoSuchElementException();
		int res = lastReturned;
		lastReturned = nextPal(++lastReturned);
		return Integer.valueOf(res);
	}
	
	int nextPal(final int n){
		int res = n;
		while (!isPalindrome(res)){
			res++; 
		}
		return res;
	}

	static boolean isPalindrome(int N){
		return N == numReverse(N);
	}
	
	static int numReverse(int N){
		int res = 0;
		if (N == 0) {
			return 0;
		}
		if (N > 0){
			res = positiveNumReverse(N);
		}else{
			res = -positiveNumReverse(-N);
		}
		return res;
	}
	
	static int positiveNumReverse(int N){
		int res = 0;
		while ( N >  0 ){
			res *= 10;
			res += N % 10;
			N = N / 10;
		}
		return res;
	}
	
	
}