Main.java

package com.enseitankad0;

import com.enseitankad0.model.*;


import java.util.*;


public class Main {

    public static void main(String[] args) {

        Datasource datasource = new Datasource();
        if (!datasource.open()) {
            System.out.println("Can't open datasource");
            return;
        }

        List<Artist> artists = datasource.queryArtists(5);
        if (artists == null) {
            System.out.println("No artists!");
            return;
        }

        LinkedList<Song> playList = new LinkedList<>();
       ListIterator<Song> listIterator = playList.listIterator();
        HashMap<Integer,Song> playList2 = new HashMap<>();
        int keyInt = 1;



        boolean quit = false;
        boolean forward = true;

        while (!quit) {
            printMenu();
            Scanner scanner = new Scanner(System.in);
            int action = scanner.nextInt();
            scanner.nextLine();


            switch (action) {
                case 1:
                    System.out.println(" ### ARTISTS LIST ### ");
                    printArtists(artists);
                    quit = false;
                    //printMenu();
                    break;

                case 2:
                    System.out.println("Which artist do you want to check?");
                    int choice = scanner.nextInt();
                    scanner.nextLine();
                    List<SongArtist> songs = datasource.queryEverything(choice, 1);
                    for (SongArtist song : songs) {
                        System.out.println(song.toString());
                    }
                    break;
                case 3:
                    System.out.println("Add song to playlist by ID. Type it. Type 0 to finis");
                    boolean finished = false;
                    ArrayList<Integer> songsID = new ArrayList<>();
                    while (!finished) {
                        int songID = scanner.nextInt();
                        scanner.nextLine();
                        if (songID == 0) {
                            finished = true;
                            continue;
                        }
                        songsID.add(songID);

                    }
                    System.out.println("You choosed song numbers");
                    List<Song> songArtists = new ArrayList<>();

                    for (Integer number : songsID) {

                        System.out.print(number + ", ");
                        songArtists.add(datasource.queryArtistsForSong(number));
                    }

                    System.out.println(String.format("|%1$-5s|%2$-40s|%3$-30s|%4$-30s", "ID", "Song title", "Album name", "Artist name"));
                    System.out.println("-------------------------------------------------------------------------------------------");

                    for (Song song : songArtists) {
                        System.out.println(song.toString());
                        playList.add(song);
                        playList2.put(keyInt,song);
                        keyInt++;
                    }
                    break;

                case 4:
                    printList(playList);
                    break;

                case 5:

//                    System.out.println("NOW PLAYING");
//                    System.out.println(playList2.get(1).toString());

                    if (!forward) {
                        if (listIterator.hasNext()) {
                            listIterator.next();
                        }
                        forward = true;
                    }
                    if (listIterator.hasNext()) {
                        System.out.println("Now playing " + listIterator.next());

                    } else {
                        System.out.println("We have reached the end of the playlist");
                        forward = false;
                    }
                    break;

            }

        }

        datasource.close();
    }

    public static void printArtists(List<Artist> artists) {
        for (Artist artist : artists) {

            String name = artist.getName();

            System.out.format("%1$-40s ID:  %2$5s", name, artist.getId() + "\n");

        }
    }

    private static void printMenu() {
        System.out.println("Available actions:\npress");
        System.out.println("0 - to quit\n" +
                "1 - To show artists list\n" +
                "2 - to check all songs of specified Artist\n" +
                "3 - Add songs to playlist\n" +
                "4 - list songs in the playlist\n" +
                "5 - play song\n" +
                "6 - delete current song from playlist");

    }

    private static void printList(LinkedList<Song> playList) {
        Iterator<Song> iterator = playList.iterator();
        System.out.println("========= PLAYLIST ============================================= ");
        System.out.println(String.format("|%1$-5s|%2$-40s|%3$-30s|%4$-30s", "ID", "Song title", "Album name", "Artist name"));
        System.out.println("-------------------------------------------------------------------------------------------");
        while (iterator.hasNext()) {
            System.out.println(iterator.next());
        }
        iterator.remove();
        System.out.println("================================================================");
    }
}