HW-03-oop-and-api/src/main/java/movie/apis/MovieService.java

package movie.apis;

import com.google.gson.*;
import com.google.gson.reflect.TypeToken;

import java.io.IOException;
import java.net.URI;
import java.net.http.HttpClient;
import java.net.http.HttpRequest;
import java.net.http.HttpResponse;
import java.lang.reflect.Type;
import java.util.ArrayList;
import java.util.List;

public class MovieService {

    private final static String GENRES_URL = "https://api.meshcomp.ir/api/v1/genres";
    private final static String MOVIE_BY_ID_URL = "https://api.meshcomp.ir/api/v1/movies/";
    private final static HttpClient client = HttpClient.newHttpClient();

    private String getGenresList() {
        try {
            HttpRequest request = HttpRequest.newBuilder()
                    .uri(URI.create(GENRES_URL))
                    .build();

            HttpResponse<String> response = client.send(request, HttpResponse.BodyHandlers.ofString());

            if (response.statusCode() == 200) {
                System.out.println("Genres List received successfully");
                return response.body();
            } else {
                throw new IOException("HTTP error code: " + response.statusCode());
            }
        } catch (Exception e) {
            System.out.println("!!Exception : " + e.getMessage());
        }
        return null;
    }

    private String getMoviesByGenreList(Long genreId, Long page) {
        try {
            String url = "https://api.meshcomp.ir/api/v1/genres/" + genreId + "/movies?page=" + page;

            HttpRequest request = HttpRequest.newBuilder()
                    .uri(URI.create(url))
                    .build();

            HttpResponse<String> response = client.send(request, HttpResponse.BodyHandlers.ofString());

            if (response.statusCode() == 200) {
                return response.body();
            } else {
                System.out.println("HTTP error code: " + response.statusCode());
                return null;
            }
        } catch (Exception e) {
            System.out.println("!!Exception : " + e.getMessage());
        }
        return null;
    }



    public void displayGenres() {
        String jsonResponse = getGenresList();

        if (jsonResponse == null) {
            System.out.println("Failed to get genres");
            return;
        }

        try {
            JsonObject rootObject = JsonParser.parseString(jsonResponse).getAsJsonObject();
            JsonArray genresArray = rootObject.getAsJsonArray("genres");
            Type genreListType = new TypeToken<ArrayList<Genre>>(){}.getType();
            Gson gson = new Gson();
            List<Genre> genres = gson.fromJson(genresArray, genreListType);

            System.out.println("\nALL GENRES:");
            for (Genre genre : genres) {
                System.out.println(genre.getId() + ". " + genre.getName());
            }
            System.out.println();
        } catch (Exception e) {
            System.err.println("ERROR parsing genres: " + e.getMessage());
        }
    }

    public void displayMoviesByGenre(Long genreId, Long page) {
        // TODO: Write your code here
        try {

            String jsonAsString = getMoviesByGenreList(genreId, page);
            JsonObject jsonObj = JsonParser.parseString(jsonAsString).getAsJsonObject();
            JsonArray moviesArray = jsonObj.getAsJsonArray("movies");

            List<Movie> movies = new ArrayList<>();

            for(JsonElement movie : moviesArray){
                JsonObject movieAsObj = movie.getAsJsonObject();
                System.out.printf("ID: %d | %s (%d)\n\n",
                        movieAsObj.get("id").getAsLong(), movieAsObj.get("title").getAsString(), movieAsObj.get("year").getAsLong());

                movies.add(new Movie(movieAsObj.get("id").getAsLong(),
                        movieAsObj.get("title").getAsString()));
            }

            System.out.printf("Total: %d, total_pages: %d\n\n",
                    jsonObj.get("total").getAsLong(), jsonObj.get("total_pages").getAsLong());

        } catch (Exception e) {
            System.err.println("ERROR: " + e.getMessage());
        }
    }


    /**
     * BONUS: Fetch movie details from API using movie ID
     * URL format: https://api.meshcomp.ir/api/v1/movies/{movieId}
     */
    private String getMovieById(Long movieId) {
        try {
            // TODO: Complete this method
             String url = MOVIE_BY_ID_URL + movieId;
             HttpRequest request = HttpRequest.newBuilder().uri(URI.create(url)).build();
             HttpResponse<String> response = client.send(request, HttpResponse.BodyHandlers.ofString());
             if (response.statusCode() == 200) return response.body();

            return null;
        } catch (Exception e) {
            System.out.println("!!Exception : " + e.getMessage());
        }
        return null;
    }

    public void displayMovieDetails(Long movieId) {
        // Step 1: Get JSON response from API
        String jsonResponse = getMovieById(movieId);
//        System.out.println(jsonResponse + "\n");

        // Step 2: Check if we got valid data
        // Step 3-5: Parse JSON and display details (PUT YOUR CODE INSIDE try-catch)
        if (jsonResponse == null) {
            System.out.println("Failed to get movie details for ID: " + movieId);
            return;
        }
        try {
            // TODO: Parse jsonResponse to JsonObject
            // HINT: Use JsonParser.parseString(jsonResponse).getAsJsonObject()
            JsonObject moviesObj = JsonParser.parseString(jsonResponse).getAsJsonObject();
            // TODO: use Gson to parse the json
            Gson gson = new Gson();
            Movie movie = gson.fromJson(moviesObj, Movie.class);
            String output = "           =======================================================================\n" +
                    "                               "+ movie.getTitle() +"\n" +
                    "           =======================================================================\n" +
                    "           Rating: "+ movie.getImdb_rating() +"  |  Votes: "+ movie.getImdb_votes() + "\n" +
                    "           Director: "+ movie.getDirector() +"\n" +
                    "           Cast: "+ movie.getActors() +"\n" +
                    "           Genre: "+ movie.getGenres() +"\n" +
                    "           Runtime: "+ movie.getRuntime() +"  |  Rated: "+ movie.getRated() +"\n" +
                    "           Country: "+ movie.getCountry() +"  |  Released: "+ movie.getReleased() +"\n" +
                    "           Plot: " + movie.getPlot() +
                    "\n           =======================================================================";
            System.out.println(output);

        } catch (Exception e) {
            System.err.println("ERROR parsing movie details: " + e.getMessage());
        }
    }
}