/**
 *
 */
var Mergesort = function() {
    this.instructions = [];
};

Mergesort.prototype = Object.create(Sorter.prototype);

/**
 *
 */
Mergesort.prototype.addInstruction = function(operation, left, right, mid) {
    console.log({
        operation: operation,
        left: left,
        right: right,
        mid: mid
    });

    this.instructions.push({
        operation: operation,
        left: left,
        right: right
    });
};

var count = 0;

/**
 *
 */
Mergesort.prototype.sort = function(arr, start, end) {
    count++;

    if (count > 30) {
        console.error('count exceeded');
        return;
    }

    if (start >= end) {
        this.addInstruction('single', start, end, null);
        return;
    }

    var mid = start + Math.floor((end - start) / 2);
    // this.addInstruction('init', start, end, mid);


    this.sort(arr, start, mid);
    this.sort(arr, mid + 1, end);
    return;
};