fix issue #13 - lists wont show more than 20 movies - udacity/ios-nd-…

…networking#13

TheMovieManager/Controller/SearchViewController.swift

@@ -18,6 +18,10 @@ class SearchViewController: UIViewController {
     var selectedIndex = 0
 
 	var currentSearchTask: URLSessionTask?
+
+	var currentPageNumber: Int = 0
+
+	var maxPageCount: Int = 0
 
     override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
         if segue.identifier == "showDetail" {
@@ -32,10 +36,13 @@ extension SearchViewController: UISearchBarDelegate {
 
     func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String) {
 		currentSearchTask?.cancel()
-		currentSearchTask = TMDBClient.searchForMovie(query: searchText) { (movies, error) in
-			if let movies = movies {
-				self.movies = movies
-				self.tableView.reloadData()
+		currentSearchTask = TMDBClient.searchForMovie(query: searchText) { (movieResults, error) in
+			if let movieResults = movieResults {
+				weak var searchVC = self
+				searchVC?.movies = movieResults.results
+				searchVC?.currentPageNumber = movieResults.page
+				searchVC?.maxPageCount = movieResults.totalPages
+				searchVC?.tableView.reloadData()
 			}
 		}
     }
@@ -93,5 +100,24 @@ extension SearchViewController: UITableViewDataSource, UITableViewDelegate {
         performSegue(withIdentifier: "showDetail", sender: nil)
         tableView.deselectRow(at: indexPath, animated: true)
     }
+
+	func tableView(_ tableView: UITableView, willDisplay cell: UITableViewCell, forRowAt indexPath: IndexPath) {
+		guard currentPageNumber > 0 else { return }
+		guard maxPageCount > 0 else { return }
+		guard currentPageNumber + 1 <= maxPageCount else { return }
+		guard indexPath.row == movies.count-1 else { return }
+
+		if let query = searchBar.text {
+			TMDBClient.searchForMovie(query: query, page: currentPageNumber + 1) { (movieResults, error) in
+				if let movieResults = movieResults {
+					weak var searchVC = self
+					searchVC?.movies.append(contentsOf: movieResults.results)
+					searchVC?.tableView.reloadData()
+					searchVC?.currentPageNumber = movieResults.page
+					searchVC?.maxPageCount = movieResults.totalPages
+				}
+			}
+		}
+	}
 
 }

TheMovieManager/Model/TMDB Client/TMDBClient.swift

@@ -36,7 +36,7 @@ class TMDBClient {
 		case markWatchlist
 		case markFavorite
 		case getPosterImage(String)
-		case search(String)
+		case search(String, Int)
 
 		var stringValue: String {
 			switch self {
@@ -50,7 +50,7 @@ class TMDBClient {
 				case .markWatchlist: return Endpoints.base + "/account/\(Auth.accountId)/watchlist" + Endpoints.apiKeyParam + "&session_id=\(Auth.sessionId)"
 				case .markFavorite: return Endpoints.base + "/account/\(Auth.accountId)/favorite" + Endpoints.apiKeyParam + "&session_id=\(Auth.sessionId)"
 				case .getPosterImage(let posterPath): return Endpoints.basePoster + posterPath
-				case .search(let movieQuery): return Endpoints.base + "/search/movie" + Endpoints.apiKeyParam + "&query=\(movieQuery.addingPercentEncoding(withAllowedCharacters: .urlQueryAllowed) ?? "")"
+				case .search(let movieQuery, let page): return Endpoints.base + "/search/movie" + Endpoints.apiKeyParam + "&query=\(movieQuery.addingPercentEncoding(withAllowedCharacters: .urlQueryAllowed) ?? "")" + "&page=\(page)"
 			}
 		}
 
@@ -136,12 +136,12 @@ class TMDBClient {
 		}
 	}
 
-	class func searchForMovie(query: String, completion: @escaping ([Movie]?, Error?) -> Void) -> URLSessionTask {
-		let task = taskForGetRequest(url: Endpoints.search(query).url, responseType: MovieResults.self) { (response, error) in
+	@discardableResult class func searchForMovie(query: String, page: Int = 1, completion: @escaping (MovieResults?, Error?) -> Void) -> URLSessionTask {
+		let task = taskForGetRequest(url: Endpoints.search(query, page).url, responseType: MovieResults.self) { (response, error) in
 			if let response = response {
-				completion(response.results, nil)
+				completion(response, nil)
 			} else {
-				completion([], error)
+				completion(nil, error)
 			}
 		}
 		return task