nathanhammond/ember-fast-link-to

import Ember from 'ember';
import layout from '../templates/components/fast-link-to';

let { Component, generateGuid, get, getOwner, LinkComponent } = Ember;

function findOriginal(PrototypeMixin) {
  if (!PrototypeMixin.ownerConstructor) { return; }

  let result;
  let identity = PrototypeMixin.ownerConstructor.toString();
  if (identity === 'LinkComponent') {
    return PrototypeMixin.mixins[1].properties;
  } else {
    for (let i = 0; i < PrototypeMixin.mixins.length; i++) {
      result = findOriginal(PrototypeMixin.mixins[i]);
      if (result) { return result; }
    }
  }
}

let linkProto = findOriginal(LinkComponent.PrototypeMixin);
let properties = Object.keys(linkProto);
let fastLinkProto = {};

for (let i = 0; i < properties.length; i++) {
  fastLinkProto[properties[i]] = linkProto[properties[i]];
}

fastLinkProto.classNameBindings = ['loading', 'disabled'];
fastLinkProto.layout = layout;

function supportEngines() {
  let params = get(this, 'params');

  let owner = getOwner && getOwner(this);
  if (owner && owner.mountPoint) {
    let fullRouteName = owner.mountPoint + '.' + params[0];
    this.set('targetRouteName', fullRouteName);
  }
}

if (linkProto.willRender) {
  fastLinkProto.init = function() {
    linkProto.init.apply(this, arguments);

    // Support 1.13.
    // Harmless in other versions.
    this.set('attrs.hasBlock', true);

    // Support 1.13 and 2.0 which don't set up `elementId`.
    var elementId = this.get('elementId');
    if (!elementId) {
      this.set('elementId', generateGuid());
    }
  };
  fastLinkProto.willRender = function() {
    linkProto.willRender.apply(this, arguments);
    supportEngines.apply(this, arguments);
  };
} else {
  fastLinkProto.didReceiveAttrs = function() {
    linkProto.didReceiveAttrs.apply(this, arguments);
    supportEngines.apply(this, arguments);
  };
}

let FastLinkComponent = Component.extend(fastLinkProto);

FastLinkComponent.toString = function() { return 'FastLinkComponent'; };

FastLinkComponent.reopenClass({
  positionalParams: 'params'
});

export default FastLinkComponent;