import {Tool} from './tool'

export class AddSegmentTool extends Tool {

  constructor(viewer, multi) {
    super(multi ? "multi line" : "line", viewer);
    this.line = null;
    this.multi = multi;
  }

  restart(e) {
    this.sendMessage('specify the first point')
  }

  cleanup() {
    this.viewer.cleanSnap();
    this.line = null;
  }


  mousemove(e) {
    var p = this.viewer.screenToModel(e);
    if (this.line != null) {
      this.viewer.snap(p.x, p.y, [this.line.a, this.line.b]);
      this.line.b.x = p.x;
      this.line.b.y = p.y;
      this.viewer.refresh();
    } else {
      this.viewer.snap(p.x, p.y, []);
      this.viewer.refresh();
    }
  }
  
  mouseup(e) {
    if (this.line == null) {
      const b = this.viewer.screenToModel(e);
      var a = b;
      var needSnap = false;
      if (this.viewer.snapped.length != 0) {
        a = this.viewer.snapped.pop();
        this.viewer.cleanSnap();
        needSnap = true;
      }
      this.line = this.viewer.addSegment(a.x, a.y, b.x, b.y, this.viewer.activeLayer);
      if (needSnap) {
        this.viewer.parametricManager.linkObjects([this.line.a, a]);
      }
      this.sendMessage('specify ' + (this.multi ? 'next' : 'end') +' point');
      this.viewer.refresh();
    } else {
      if (this.viewer.snapped.length != 0) {
        var p = this.viewer.snapped.pop();
        this.viewer.cleanSnap();
        this.line.b.x = p.x;
        this.line.b.y = p.y;
        this.viewer.parametricManager.linkObjects([this.line.b, p]);
        this.viewer.refresh();
      }
      if (this.multi) {
        const b = this.line.b;
        this.line = this.viewer.addSegment(b.x, b.y, b.x, b.y, this.viewer.activeLayer);
        this.viewer.parametricManager.linkObjects([this.line.a, b]);
      } else {
        this.line = null;
      }
    }
  }

  dblclick(e) {
    this.cancelSegment();
  }

  keydown(e) {
    if (e.keyCode == 27) {
      this.cancelSegment();
    }
  }

  cancelSegment() {
    if (this.multi && this.line != null) {
      this.viewer.remove(this.line);
      this.viewer.refresh();
      this.cleanup(null);
    }
  }
}