placesApi.js

export class PlacesAPI {
  constructor(apiKey, url) {
    this.apiKey = apiKey;
    this.url = url;
    this.placeid = null;
  }

  // extract url to get review dict:
  /*    text:{author_name,
        author_url,
        language,
        original_language,
        profile_photo_rul,
        rating,
        relative_time_description,
        text,
        time,
        translated}
  */
  async getReviewsDict() {
    try {
      var reviewsDict = {};
      if (this.placeid == null) {
        this.placeid = await this.getPlaceId();
      }
      const reviews = await this.getReviews(this.placeid);
      reviews.forEach(review => {
        reviewsDict[review.text] = review;
      });
      return reviewsDict;
    } catch (error) {
      console.error(error);
    }
  }

  // GET name, address, rating for a restaurant
  async getPlaceInfo() {
    try {
      if (this.placeid == null) {
        this.placeid = await this.getPlaceId();
      }
      const url = `https://maps.googleapis.com/maps/api/place/details/json?place_id=${this.placeid}&fields=name,rating,formatted_address&key=${this.apiKey}`;
      const response = await fetch(url);
      const data = await response.json();
      const userInfo = {
        name: data.result.name,
        rating: data.result.rating,
        address: data.result.formatted_address
      };
      return userInfo;
    } catch (error) {
      console.error(error)
    }
    return 0;
  }


  // retrieve place_id from url
  async getPlaceId() {
    const name = decodeURIComponent(this.url.split("/").pop().split("@")[0].replace(/\+/g, " "));
    const lat = this.url.split(",")[0].split("@")[1];
    const lng = this.url.split(",")[1];
    const placeId = await this.getPlaceIdFromLatLng(lat, lng, name);
    return placeId;
  }

  // GET request to retrieve place_id using lat and lng with correct name
  async getPlaceIdFromLatLng(lat, lng, name) {
    const url = `https://maps.googleapis.com/maps/api/place/nearbysearch/json?location=${lat},${lng}&radius=500&type=restaurant&key=${this.apiKey}`;
    try {
      const response = await fetch(url);
      const data = await response.json();
      var res = data.results[0].place_id;
      data.results.forEach(function(result) {
        if (result.name == name) {
          res = result.place_id;
        }
      });
      return res;
    } catch (error) {
      console.error(error)
    }
    return 0;
  }

  // GET request to retrieve all reviews and their info for placeId
  async getReviews(placeId) {
    const url = `https://maps.googleapis.com/maps/api/place/details/json?place_id=${placeId}&fields=reviews&key=${this.apiKey}`;
    try {
      const response = await fetch(url);
      const data = await response.json();
      return data.result.reviews;
    } catch (error) {
      console.error(error)
    }
    return 0;
  }
}


// Sample usage:
/*
const apiKey = 'AIzaSyA2ft9Ti0ILphcvqQF3qvHvjY35LOhQxdk';
const url = "https://www.google.com/maps/place/Rose+Bakery+%26+Cafe/@43.4642986,-80.5231153,18z/data=!4m6!3m5!1s0x882b46ae49d69c17:0xd949247f34b9b696!8m2!3d43.55811!4d-79.642758!16s%2Fg%2F1tc_04hc";
const placesAPI = new PlacesAPI(apiKey,url);
async function myFunction() {
  const review = await placesAPI.getReviewsDict();
  console.log(review);
  const placeinfo = await placesAPI.getPlaceInfo();
  console.log(userinfo);
}
myFunction();
*/