import { Injectable } from '@angular/core';
import { Http } from '@angular/http';
import 'rxjs/add/operator/map';

@Injectable()
export class ProfileService {

  endpoint: string = 'https://api.fitz.guru/urnings/profiles';
  fallback: string = 'assets/data/profiles.json';
  epSubmitted: string = '/submitted';
  epVerified: string = '/verified';
  idMap: any = { all: {}, submitted: {}, verified: {} };
  profiles: any;


  constructor(private http: Http) {
    this.idMap = {};
    this.profiles = null;
  }

  load() {
    if (this.profiles) {
      return Promise.resolve(this.profiles);
    }

    return new Promise(resolve => {
      this.doGetRequest(this.endpoint, resolve);
    });
  }

  loadSubmitted() {
    if (this.profiles && this.profiles.submitted) {
      return Promise.resolve(this.profiles.submitted);
    }

    return new Promise(resolve => {
      this.doGetRequest(this.endpoint + this.epSubmitted, resolve, 'submitted');
    });
  }

  loadVerified() {
    if (this.profiles && this.profiles.verified) {
      return Promise.resolve(this.profiles.verified);
    }

    return new Promise(resolve => {
      this.doGetRequest(this.endpoint + this.epVerified, resolve, 'verified');
    });
  }

  doGetRequest(endpoint, resolve, type = 'all') {
    this.http.get(endpoint)
      .map(res => res.json())
      .subscribe(
        data => {
          this.profiles = this.profiles || {};
          this.profiles[type] = data;
          this.profiles[type].reduce((map, profile, i) => {
            map[profile._id] = i;
            return map;
          }, this.idMap[type]);
          resolve(this.profiles[type]);
        },
        error => {
          this.doGetRequest(this.fallback, resolve, type);
        }
      )
  }

  getNextProfile(id, type = 'all') {
    var nextIdIndex = this.idMap[type][id] + 1;
    nextIdIndex = nextIdIndex >= this.profiles[type].length ? 0 : nextIdIndex;
    return this.profiles[type][nextIdIndex];
  }

  getPreviousProfile(id, type = 'all') {
    var prevIdIndex = this.idMap[type][id] - 1;
    prevIdIndex = prevIdIndex < 0 ? (this.profiles[type].length - 1) : prevIdIndex;
    return this.profiles[type][prevIdIndex];
  }

  getProfiles() {
    return this.profiles.all;
  }

  getProfileById(id) {
    return this.profiles[this.idMap[id]];
  }

  getSubmittedProfiles() {
    return this.profiles.submitted;
  }

  getVerifiedProfiles() {
    return this.profiles.verified;
  }
}