import Service, { inject as service } from '@ember/service';
import { schedule } from '@ember/runloop';
import { get } from '@ember/object';

import wildcard from 'consul-ui/utils/routing/wildcard';
import { routes } from 'consul-ui/router';

const isWildcard = wildcard(routes);

class Outlets {
  constructor() {
    this.map = new Map();
    this.sorted = [];
  }
  sort() {
    this.sorted = [...this.map.keys()];
    this.sorted.sort((a, b) => {
      if (a === 'application') {
        return 1;
      }
      if (b === 'application') {
        return -1;
      }
      const al = a.split('.').length;
      const bl = b.split('.').length;
      switch (true) {
        case al > bl:
          return -1;
        case al < bl:
          return 1;
        default:
          return 0;
      }
    });
  }
  set(name, value) {
    this.map.set(name, value);
    // TODO: find, splice to insert at the correct index instead of sorting
    // all the time
    this.sort();
  }
  get(name) {
    return this.map.get(name);
  }
  delete(name) {
    // TODO: find, splice to delete at the correct index instead of sorting
    // all the time
    this.map.delete(name);
    this.sort();
  }
  keys() {
    return this.sorted;
  }
}
const outlets = new Outlets();
export default class RoutletService extends Service {
  @service('container') container;
  @service('env') env;
  @service('router') router;

  @service('repository/permission') permissions;

  ready() {
    return this._transition;
  }

  exists(routeName) {
    if(get(routes, routeName)) {
      return this.allowed(routeName);
    }
    return false;
  }

  allowed(routeName) {
    const abilities = get(routes, `${routeName}._options.abilities`) || [];
    if (abilities.length > 0) {
      if (!abilities.every(ability => this.permissions.can(ability))) {
        return false;
      }
    }
    return true;
  }

  transition() {
    let endTransition;
    this._transition = new Promise(resolve => {
      endTransition = resolve;
    });
    return endTransition;
  }

  findOutlet(name) {
    const keys = [...outlets.keys()];
    const key = keys.find(item => name.indexOf(item) !== -1);
    return key;
  }

  outletFor(routeName) {
    const keys = [...outlets.keys()];
    const pos = keys.indexOf(routeName);
    const key = pos + 1;
    return outlets.get(keys[key]);
  }

  /**
   * Adds urldecoding to any wildcard route `params`
   */
  normalizeParamsFor(name, params = {}) {
    if (isWildcard(name)) {
      return Object.keys(params).reduce(function(prev, item) {
        if (typeof params[item] !== 'undefined') {
          prev[item] = decodeURIComponent(params[item]);
        } else {
          prev[item] = params[item];
        }
        return prev;
      }, {});
    } else {
      return params;
    }
  }

  paramsFor(name) {
    let outletParams = {};
    const outlet = outlets.get(name);
    if (typeof outlet !== 'undefined' && typeof outlet.args.params !== 'undefined') {
      outletParams = outlet.args.params;
    }
    let route = this.router.currentRoute;
    if (route === null) {
      route = this.container.lookup('route:application');
    }
    // TODO: Opportunity to dry out this with transitionable
    // walk up the entire route/s replacing any instances
    // of the specified params with the values specified
    let current = route;
    let parent;
    let routeParams = this.normalizeParamsFor(name, current.params);
    // TODO: Not entirely sure whether we are ok exposing queryParams here
    // seeing as accessing them from here means you can get them but not set
    // them as yet
    // let queryParams = {};
    while ((parent = current.parent)) {
      routeParams = {
        ...this.normalizeParamsFor(parent.name, parent.params),
        ...routeParams,
      };
      // queryParams = {
      //   ...parent.queryParams,
      //   ...queryParams
      // };
      current = parent;
    }
    return {
      ...this.container.get(`location:${this.env.var('locationType')}`).optionalParams(),
      ...routeParams,
      // ...queryParams
      ...outletParams,
    };
  }


  // modelFor gets the model for Outlet specified by `name`, not the Route
  modelFor(name) {
    const outlet = outlets.get(name);
    if (typeof outlet !== 'undefined') {
      return outlet.model;
    }
  }

  addRoute(name, route) {
    const outlet = this.outletFor(name);
    if (typeof outlet !== 'undefined') {
      outlet.route = route;
      // TODO: Try to avoid the double computation bug
      schedule('afterRender', () => {
        outlet.routeName = name;
      });
    }
  }

  removeRoute(name, route) {
    const outlet = this.outletFor(name);
    route._model = undefined;
    if (typeof outlet !== 'undefined') {
      schedule('afterRender', () => {
        outlet.route = undefined;
      });
    }
  }

  addOutlet(name, outlet) {
    outlets.set(name, outlet);
  }

  removeOutlet(name) {
    schedule('afterRender', () => {
      outlets.delete(name);
    });
  }
}