//
//  APIManager.swift
//  LiveLikeGiphyChallenge
//
//  Created by Arbnor Tefiki on 6.2.22.
//

import Foundation

class APIManager {
  private static let giphyApiKey = "krF6wnSax3bZYT1kAAEfLeB1UwN7ZsJM"
  typealias GiphyResponse = (_ response: GiphyModel?) -> Void

  static func fetchTrendingGifs(request: GiphyRequest, completion: @escaping GiphyResponse) {
    var request = URLRequest(url: urlBuilder(request: request))
    request.httpMethod = "GET"
    URLSession.shared.dataTask(with: request) { (data, response, error) in
      if let err = error {
        print("Error fetching from Giphy: ", err.localizedDescription)
        completion(nil)
      }
      do {
        DispatchQueue.main.async {
          guard let data = data else {
            completion(nil)
            return
          }

          let object = try? JSONDecoder().decode(GiphyModel.self, from: data)
          completion(object)
        }
      }
    }.resume()
  }

  static func urlBuilder(request: GiphyRequest) -> URL {
    var components = URLComponents()
    components.scheme = "https"
    components.host = "api.giphy.com"
    components.path = "/v1/gifs/\(request.urlPath)"
    components.queryItems = [
      URLQueryItem(name: "api_key", value: giphyApiKey),
      URLQueryItem(name: "q", value: request.searchTerm),
      URLQueryItem(name: "limit", value: String(request.limit)),
      URLQueryItem(name: "offset", value: String(request.offset))
    ]
    return components.url!
  }
}