/**
 * Maintain renderer component order and coordinate hit-test priority.
 * Derived from ionstage/cmap 0.1.3, (c) 2015 iOnStage, MIT License.
 */
import { Connector, DrawingLink as Link, DrawingNode as Node } from "./drawing-components.js";
import { Component, helper } from "./drawing-support.js";

class ComponentList extends helper.List {
  constructor() {
    super();
    }

  toFront(component) {
    var data = this.data;
    var index = data.indexOf(component);

    if (index === -1)
      return;

    data.splice(index, 1);
    data.push(component);
    }

  fromPoint(ctor, x, y) {
    var data = this.data;
    // The visual stack is connector controls, concepts and finally relations.
    // Use that same priority for coordinate hit testing so a relation that is
    // hidden behind a concept can never steal the concept's click.
    var types = (ctor === Component) ? [Connector, Node, Link] : [ctor];

    for (var toleranceIndex = 0; toleranceIndex < 2; toleranceIndex++) {
      var tolerance = toleranceIndex === 0 ? 0 : 8;
      for (var typeIndex = 0; typeIndex < types.length; typeIndex++) {
        for (var i = data.length - 1; i >= 0; i--) {
          var component = data[i];

          if (!(component instanceof types[typeIndex]))
            continue;

          if (component.visible === false)
            continue;

          if (component.contains(x, y, tolerance))
            return component;
        }
      }
    }

    return null;
    }
}



class DisabledConnectorList extends helper.List {
  constructor() {
    super();
    }

  add(type, link) {
    super.add( {
      type: type,
      link: link
    });
    }

  remove(type, link) {
    super.remove( {
      type: type,
      link: link
    });
    }

  contains(type, link) {
    return super.contains( {
      type: type,
      link: link
    });
    }

  equal(a, b) {
    return a.type === b.type && a.link === b.link;
    }
}

export { ComponentList, DisabledConnectorList };