import java.util.Scanner;

public class ProjectApp { public static void main(String[] args) { Scanner sc = new Scanner(System.in); //I put variable to store the User's choice ' int choice;

    // we used do while loop to continuous run the program unless user type "0"'
    do {
        System.out.println("\n--- MAIN MENU ---");
        System.out.println("1. Sequence ");
        System.out.println("2. Selection ");
        System.out.println("3. Looping ");
        System.out.println("0. Exit");
        System.out.print("Select an option: ");
        
        //  Getting the menu choice From  user
        choice = sc.nextInt();
        
    
        sc.nextLine(); 

        // we used switch case so the program won't run simultaneously and  what the user has chosen
        switch (choice) {
            case 1:
                
                System.out.println("Trip Calculator ");
                
                System.out.print("Enter Destination Name: ");
                String destination = sc.nextLine();
                // Float=  is specifically a 32-bit(4byte)
                //I used float so it only shows2 decimal point unless double which needed to be precise that showsallthe numbers
                System.out.print("Enter Distance (in Kilometers): ");
                float distance = sc.nextFloat();

                System.out.print("Enter Average Speed (km/h): ");
                float speed = sc.nextFloat();

               
                // Formula: Time = Distance divided by Speed
                float travelTime = distance / speed;

                // I use the '+' sign to combine our labels with the values in the variables 
                System.out.println(" TRAVEL DETAILS");
                System.out.println("Destination: " + destination);
                
                System.out.printf(" Total Distance:        %.2f km%n", distance);
                System.out.printf("Your speed :            %.2f km/h%n", speed);
                
                System.out.println("-----------------------");
                
                // Here, I used  %.2f so itlbe readablr (e.g., "2.50 hours" instead of "2.500000")
                System.out.printf("Estimated Travel Time: %.2f hours%n", travelTime);
                
                System.out.println("-----------------------");
                System.out.println(" Ingat po!");
            
                break;//we used brake so the program won't continues to run

            case 2:
       
                System.out.println("What is the password?");

                String password = sc.nextLine();

                //This is the password
                if (password.equals("DCIT22PROJECT")) {
                  //itllbe showed if  password input is correct
                      System.out.println("Password accepted");
                } else {
                   //The 'else' block runs ONLY if the 'if' condition above was FALSE
                   //and here below is the opposite 
                       System.out.println("Access Denied! Try again.");
                }
           
                break;

            case 3:
           
                // : The flashlight starts at 100% battery
                int batteryLife = 100;

                System.out.println("The flashlight is ON. Battery: 100%");                                     
                //it'll check if battery is not below or  equal to 0%
               
                while (batteryLife > 0) {
                    
                    System.out.print("\nHow many minutes will you use the light? ");

                    //the program will wait for another input if it has still battery 
                    int minutesUsed = sc.nextInt();

                    // every minutes of use ng flashlight minus ng batteryrpercent
                    //this code shows that every minute the flashlight used is minus into battery life
                    batteryLife = batteryLife - minutesUsed;

                    //it will show what happen and how many percent left is
                    if (batteryLife > 0) {
                        System.out.println("Battery is now at: " + batteryLife + "%");
                    }
                    
                    // repeat sa "while line"
                    //to see the new battery percentage 
                }

                // the program will end if the battery of the flashlight is at 0%
                System.out.println("The battery is dead. It's dark now!");
                
                break;

            case 0:
                
                System.out.println("Exiting... Thank you po!");
                break;

            default:
                //  the program will run into error if the user pick numbers other than 0-3
                System.out.println("Invalid choice! Please choose from 0-3.");
        }
    } while (choice != 0); //  the program will run until the user didn't pick the option "0"

    sc.close();
}

}