var _curry2 = require('./_curry2');
var _xfBase = require('./_xfBase');


module.exports = (function() {
  function XDropLast(n, xf) {
    this.xf = xf;
    this.pos = 0;
    this.full = false;
    this.acc = new Array(n);
  }
  XDropLast.prototype['@@transducer/init'] = _xfBase.init;
  XDropLast.prototype['@@transducer/result'] =  function(result) {
    this.acc = null;
    return this.xf['@@transducer/result'](result);
  };
  XDropLast.prototype['@@transducer/step'] = function(result, input) {
    if (this.full) {
      result = this.xf['@@transducer/step'](result, this.acc[this.pos]);
    }
    this.store(input);
    return result;
  };
  XDropLast.prototype.store = function(input) {
    this.acc[this.pos] = input;
    this.pos += 1;
    if (this.pos === this.acc.length) {
      this.pos = 0;
      this.full = true;
    }
  };

  return _curry2(function _xdropLast(n, xf) { return new XDropLast(n, xf); });
}());