// Generated by CoffeeScript 1.10.0
(function() {
  var MultilineTool, get_closest_point,
    bind = function(fn, me){ return function(){ return fn.apply(me, arguments); }; };

  global(MultilineTool = (function() {
    function MultilineTool(conf) {
      this.hover_on_point = bind(this.hover_on_point, this);
      this.touch_link = bind(this.touch_link, this);
      this.touch_node = bind(this.touch_node, this);
      this.new_point = bind(this.new_point, this);
      this.graph = conf.graph;
      this.view = conf.view;
      this.last_point = null;
      this.listeners = [];
      this.listeners.push(this.view.on('hover_on_point', this.hover_on_point));
      this.listeners.push(this.view.on('action_on_point', this.new_point));
      this.listeners.push(this.view.on('action_on_node', this.touch_node));
      this.listeners.push(this.view.on('action_on_link', this.touch_link));
    }

    MultilineTool.prototype.destroy = function() {
      this.listeners.forEach((function(_this) {
        return function(l) {
          return _this.view.on(l, null);
        };
      })(this));
      if (this.preview_line != null) {
        return this.preview_line.remove();
      }
    };

    MultilineTool.prototype.new_point = function(x, y) {
      var nn;
      nn = this.graph.new_node(x, y);
      if (this.last_point != null) {
        this.graph.new_link(this.last_point, nn);
      }
      this.last_point = nn;
      return nn;
    };

    MultilineTool.prototype.touch_node = function(n, x, y) {
      if (this.last_point != null) {
        if (this.last_point !== n) {
          this.graph.new_link(this.last_point, n);
        }
        return this.last_point = null;
      } else {
        return this.last_point = n;
      }
    };

    MultilineTool.prototype.touch_link = function(l, x, y) {
      var A, B, CP, P, must_close, nn;
      A = {
        x: l.source.x,
        y: l.source.y
      };
      B = {
        x: l.target.x,
        y: l.target.y
      };
      P = {
        x: x,
        y: y
      };
      CP = get_closest_point(A, B, P);
      must_close = this.last_point != null;
      nn = this.new_point(CP.x, CP.y);
      if (must_close) {
        this.last_point = null;
      }
      this.graph.delete_link(l);
      this.graph.new_link(l.source, nn);
      return this.graph.new_link(nn, l.target);
    };

    MultilineTool.prototype.hover_on_point = function(x, y) {
      if (this.last_point != null) {
        if (this.preview_line == null) {
          this.preview_line = this.view.tools_overlay.append('line');
        }
        return this.preview_line.attrs({
          "class": 'preview_line',
          x1: (function(_this) {
            return function(d) {
              return _this.last_point.x;
            };
          })(this),
          y1: (function(_this) {
            return function(d) {
              return _this.last_point.y;
            };
          })(this),
          x2: x,
          y2: y
        });
      } else {
        if (this.preview_line != null) {
          this.preview_line.remove();
          return this.preview_line = null;
        }
      }
    };

    return MultilineTool;

  })());

  get_closest_point = function(A, B, P) {
    var C, a_to_b, a_to_p, atb2, atp_dot_atb, t;
    a_to_p = [P.x - A.x, P.y - A.y];
    a_to_b = [B.x - A.x, B.y - A.y];
    atb2 = a_to_b[0] * a_to_b[0] + a_to_b[1] * a_to_b[1];
    atp_dot_atb = a_to_p[0] * a_to_b[0] + a_to_p[1] * a_to_b[1];
    t = atp_dot_atb / atb2;
    C = {
      x: A.x + a_to_b[0] * t,
      y: A.y + a_to_b[1] * t
    };
    return C;
  };

}).call(this);