/**
 * Created by nuintun on 2015/11/25.
 */

'use strict';

module.exports = function (Terminal){
  // CSI Ps S  Scroll up Ps lines (default = 1) (SU).
  Terminal.prototype.scrollUp = function (params){
    var param = params[0] || 1;

    while (param--) {
      this.lines.splice(this.ybase + this.scrollTop, 1);
      this.lines.splice(this.ybase + this.scrollBottom, 0, this.blankLine());
    }

    this.updateRange(this.scrollTop);
    this.updateRange(this.scrollBottom);
  };

  // CSI Ps T  Scroll down Ps lines (default = 1) (SD).
  Terminal.prototype.scrollDown = function (params){
    var param = params[0] || 1;

    while (param--) {
      this.lines.splice(this.ybase + this.scrollBottom, 1);
      this.lines.splice(this.ybase + this.scrollTop, 0, this.blankLine());
    }

    this.updateRange(this.scrollTop);
    this.updateRange(this.scrollBottom);
  };

  // CSI Ps ; Ps r
  //   Set Scrolling Region [top;bottom] (default = full size of win-
  //   dow) (DECSTBM).
  // CSI ? Pm r
  Terminal.prototype.setScrollRegion = function (params){
    if (this.prefix) return;

    this.x = 0;
    this.y = 0;
    this.scrollTop = (params[0] || 1) - 1;
    this.scrollBottom = (params[1] || this.rows) - 1;
  };
};