text: /* @flow */
  
  import { parksFromJson } from "./map";
  
  import type { Parks } from "trailz";
  import type { Trails } from "trailz/park/fields";
  import type { Trail } from "trailz/trail";
  
  
  export function listParks(): Promise<Parks> {
    return Promise
      .resolve(db)
      .then(parksFromJson);
  }
  
  export function toggleSelectedTrail(trail: Trail): Promise<Trails> {
    let index = selected.indexOf(trail);
    if (index !== -1) {
      selected.splice(index, 1);
    } else {
      selected.push(trail);
    }
    return Promise.resolve(selected);
  }
  
  export function listSelectedTrails(): Promise<Trails> {
    return Promise.resolve(selected);
  }
  
  var selected: Trails = [];
  
  var db = [{
    id : "PARK-1",
    name : "Premier Park",
    trails : [
        {
          id : "TRAIL-1-1",
          name : "Trail 1-1",
          distance : [5, "km"],
          grade: 4,
        },
        {
          id : "TRAIL-1-2",
          name : "Trail 1-2",
          distance : [800, "m"],
          grade: 2,
        },
    ],
  }, {
    id : "PARK-2",
    name : "Secondary Park",
    trails : [
        {
          id : "TRAIL-2-1",
          name : "Trail 2-1",
          distance : [1600, "m"],
          grade: 2,
        },
        {
          id : "TRAIL-2-2",
          name : "Trail 2-2",
          distance : [8.2, "km"],
          grade: 5,
        },
    ],
  }];
  