/**
 * Created by nuintun on 2015/11/24.
 */

'use strict';

module.exports = function (Terminal){
  // CSI Ps J Erase in Display (ED).
  // Ps = 0 -> Erase Below (default).
  // Ps = 1 -> Erase Above.
  // Ps = 2 -> Erase All.
  // Ps = 3 -> Erase Saved Lines (xterm).
  // CSI ? Ps J
  // Erase in Display (DECSED).
  // Ps = 0 -> Selective Erase Below (default).
  // Ps = 1 -> Selective Erase Above.
  // Ps = 2 -> Selective Erase All.
  Terminal.prototype.eraseInDisplay = function (params){
    var j;

    switch (params[0]) {
      case 0:
        this.eraseRight(this.x, this.y);

        j = this.y + 1;

        for (; j < this.rows; j++) {
          this.eraseLine(j);
        }
        break;
      case 1:
        this.eraseLeft(this.x, this.y);

        j = this.y;

        while (j--) {
          this.eraseLine(j);
        }
        break;
      case 2:
        j = this.rows;

        while (j--) this.eraseLine(j);
        break;
      case 3:
        // no saved lines
        break;
    }
  };

  // CSI Ps K Erase in Line (EL).
  // Ps = 0 -> Erase to Right (default).
  // Ps = 1 -> Erase to Left.
  // Ps = 2 -> Erase All.
  // CSI ? Ps K
  // Erase in Line (DECSEL).
  // Ps = 0 -> Selective Erase to Right (default).
  // Ps = 1 -> Selective Erase to Left.
  // Ps = 2 -> Selective Erase All.
  Terminal.prototype.eraseInLine = function (params){
    switch (params[0]) {
      case 0:
        this.eraseRight(this.x, this.y);
        break;
      case 1:
        this.eraseLeft(this.x, this.y);
        break;
      case 2:
        this.eraseLine(this.y);
        break;
    }
  };
};