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gistfile1.txt

// Online Java Compiler
// Use this editor to write, compile and run your Java code online
import java.time.LocalDate;
import java.time.format.DateTimeFormatter;
import java.util.Locale;
import java.util.Random;
import java.util.Scanner;

class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.println("=============================================================");
        System.out.println("\n  ____             _                 _____         _ _       \r\n" +
                " |  _ \\           | |               |  __ \\       | (_)      \r\n" +
                " | |_) |_   _ _ __| |__   __ _ _ __ | |__) |__  __| |_  __ _ \r\n" +
                " |  _ <| | | | '__| '_ \\ / _` | '_ \\|  ___/ _ \\/ _` | |/ _` |\r\n" +
                " | |_) | |_| | |  | | | | (_| | | | | |  |  __/ (_| | | (_| |\r\n" +
                " |____/ \\__,_|_|  |_| |_|\\__,_|_| |_|_|   \\___|\\__,_|_|\\__,_|\r\n" +
                "                                                             \r\n" +
                "                                                             ");
        System.out.println("=============================================================");
        System.out.println("============== Selamat datang di Burhanpedia! ===============");
        System.out.println("=============================================================");
        System.out.println("Masukkan stok awal");
        var stokAwal = scanner.nextInt();  
        
        System.out.println("Masukkan harga barang"); 
        var hargaBarang = scanner.nextInt();  
    
        System.out.println("Masukkan saldo awal"); 
        var saldoAwal = scanner.nextInt(); 
        
        while (true) {
            System.out.println("Pilih menu\n 1. Penjual\n2.	Pembeli\n3. Hari Selanjutnya\n4. Keluar");
    
            System.out.println("Perintah"); 
            var perintah = scanner.nextInt();
            
            boolean isExit = false;
    
            switch (perintah) {
                case 1: 
                    // ke menu penjual
                    while (true) {
                            System.out.println("===== MENU PENJUAL =====\n1.	Cek Stok\n2.	Cek Harga Barang\n3.	Tambah Stok \n4. Ubah Harga Barang \n5.	Generate Voucher\n6.	Kirim Barang\n7.	Lihat Laporan Pendapatan\n8.	Kembali ke menu utama");
                        System.out.println("Perintah"); 
                        var perintahPenjual = scanner.nextInt();

                        if (perintahPenjual == 1) {
                            var stokCek = cekStock(stokAwal);
                            System.out.println("==============================\nStok saat ini adalah: " +  stokCek + "\n==============================");
                        }
                        if (perintahPenjual == 2) {
                            var hargaBarangCek = cekHargaBarang(hargaBarang);
                            System.out.println("==============================\nHarga Barang saat ini adalah: " +  hargaBarang + "\n==============================");
                        }
                        
                        if (perintahPenjual == 8) {
                            break;
                        }
                    }
                    break;
                case 2://
                    // ke menu pembeli
                    while (true) {
                        System.out.println("===== MENU PEMBELI =====\n1.	Cek Saldo\n2.	Top Up Saldo\n3.	Cek Harga Barang\n4.	Beli Barang\n5.	Generate Voucher\n6.	Lacak Barang\n7.	Lihat Laporan Pengeluaran\n8.	Kembali ke menu utama");
                        System.out.println("Perintah"); 
                        var perintahPembeli = scanner.nextInt();

                        if (perintahPembeli == 1) {
                            var saldo = cekSaldo(saldoAwal);
                            System.out.println("==============================\nHarga Saldo saat ini adalah: " +  saldo + "\n==============================");
                        }
                        if (perintahPembeli == 8) {
                            break;
                        }
                    }
                    break;
                case 3:
                    break;
                    // hari selanjutnya
                case 4:
                    isExit = true;
                    break;
                    //1
                default:
                    System.out.println("Invalid Menu");
                
                if (isExit) break;
            }
        }
        // System.out.println (generateRandomChars (
        //         "ABCDEFGHIJKLMNOPQRSTUVWXYZ", 10));
    }
    
    public static int cekStock(int stok) {
        return stok;
    }
    
    public static int cekHargaBarang(int hargaBarang) {
        return hargaBarang;
    }
    
    public static int cekSaldo(int saldo) {
        return saldo;
    }

    public static int topUpSaldo(int saldo) {
        return saldo;
    }
    
    public static String generateRandomChars (String candidateChars, int length) {
        StringBuilder sb = new StringBuilder ();
        Random random = new Random ();
        for (int i = 0; i < length; i ++) {
            sb.append (candidateChars.charAt (random.nextInt (candidateChars
                    .length ())));
        }

        return sb.toString ();
    }
}