Module 1.3

//MobilePhone.java
package phone;

/*
For Runner.java
 */

public class MobilePhone {
    //Attributes
    private float load;
    private char network;
    private float ratePerText;
    private float ratePerCall;
    //Error Checker
    boolean negativeError = false;
    //Constructor
    public MobilePhone(float init_load, char init_network) {
        load = init_load;
        network = init_network;
    }
    //Methods
    public float checkBalance() {
        return load;
    }
    public void call(int minutes, char networkReceiver) {
        //negativeError
        negativeError = false;
        //ratePerCall value
        switch(network) {
            case 's': ratePerCall = 3; break;
            case 't': ratePerCall = 5; break;
            case 'g': ratePerCall = 7; break;
            default: break;
        }
        //Calculate
        if (network == networkReceiver) {
            //Cost
            float cost = load;
            cost -= minutes * ratePerCall;
            //Find negative
            if (cost < 0) {
                System.out.println("The load value cannot be negative.");
                negativeError = true;
            }
            else load  -= minutes * ratePerCall;
        }
        else {
            //Cost
            float cost = load;
            cost -= minutes * (ratePerCall * 2);
            //Find negative
            if (cost < 0) {
                System.out.println("The load value cannot be negative.");
                negativeError = true;
            }
            else load -= minutes * (ratePerCall * 2);
        }
    }
    public void text(int length, char networkReceiver) {
        //negativeError
        negativeError = false;
        //ratePerText value
        ratePerText = 1; //value is always 1
        //price increases every 160 char
        //Calculate
        if (network == networkReceiver) {
            //Cost
            float cost = load;
            cost -= (float) length / 160 * ratePerText;
            //Find negative
            if (cost < 0) {
                System.out.println("The load value cannot be negative.");
                negativeError = true;
            }
            else load -= (float) length / 160 * ratePerText;
        }
        else {
            //Cost
            float cost = load;
            cost -= (float) length / 160 * (ratePerText * 2);
            //Find negative
            if (cost < 0) {
                System.out.println("The load value cannot be negative.");
                negativeError = true;
            }
            else load -= (float) length / 160 * (ratePerText * 2);
        }
    }
    public void reload(float amount) {
        if (amount < 0) System.out.println("The amount must not be a negative value.");
        else load += amount;
    }
    public char getNetwork() {
        return network;
    }
    public void setNetwork(char network) {
        this.network = network;
    }
    public boolean getNegativeError() {
        return negativeError;
    }
}

//Runner.java
package phone;

/*

 */

import java.util.Scanner;
import java.util.Random; //generate random receiver network

public class Runner {
    public static void main(String[] args) {
        boolean exit = false;
        int option = 0;
        char network = 's';
        //Instance
        MobilePhone phone = new MobilePhone((float) 0.0,'s');
        //Start
        do {
            //generate random receiver network
            int[] networkArray = {1, 2, 3};
            int networkRandom = new Random().nextInt(networkArray.length);
            switch(networkArray[networkRandom]) {
                case 1: network = 's'; break;
                case 2: network = 't'; break;
                case 3: network = 'g'; break;
            }
            //Display Text
            System.out.println("1. Call");
            System.out.println("2. Text");
            System.out.println("3. Check Load");
            System.out.println("4. Reload");
            System.out.println("5. Network");
            System.out.println("6. Exit");
            System.out.printf("Input: ");
            Scanner optionScanner = new Scanner(System.in);
            option = optionScanner.nextInt();
            //Action
            switch(option) {
                case 1: //Call
                    boolean exitCall = false;
                    do {

                        //Input
                        System.out.printf("Phone Number Input: ");
                        Scanner phoneNumber = new Scanner(System.in);
                        String lineCall = phoneNumber.next();
                        //Output Check
                        if(lineCall.length() != 10) System.out.println("Please input 10 digits.");
                        else {
                            System.out.println("Calling " + lineCall + " with network " + network);
                            System.out.printf("Minutes Called Input: ");
                            Scanner minutesCalled = new Scanner(System.in);
                            int minutesCall = minutesCalled.nextInt();
                            phone.call(minutesCall, network);
                            if(phone.getNegativeError()) break;
                            else {
                                System.out.println("Called for " + minutesCall + " minutes at the rate of network " + phone.getNetwork() + ".");
                                System.out.printf("New Balance: Php %.2f\n", phone.checkBalance());
                            }

                            exitCall = !exitCall;
                        }
                    }while(!exitCall);
                    break;
                case 2: //Text
                    boolean exitText = false;
                    do {
                        //Input
                        System.out.printf("Phone Number Input: ");
                        Scanner phoneNumber = new Scanner(System.in);
                        String lineText = phoneNumber.next();
                        //Output Check
                        if(lineText.length() != 10) System.out.println("Please input 10 digits.");
                        else {
                            System.out.println("Texting " + lineText + ".");
                            System.out.printf("Message Input: ");
                            Scanner textMessaged = new Scanner(System.in);
                            String textMessage = textMessaged.nextLine();
                            phone.text(textMessage.length(), network);
                            if(phone.getNegativeError()) break;
                            else {
                                System.out.println("Message successfully sent!");
                                System.out.printf("New Balance: Php %.2f\n", phone.checkBalance());
                            }
                            exitText = !exitText;
                        }
                    }while(!exitText);
                    break;
                case 3: //Check Balance
                    System.out.printf("Load: Php %.2f\n", phone.checkBalance());
                    break;
                case 4: //Reload
                    System.out.printf("Reload Input: ");
                    Scanner amountAdded = new Scanner(System.in);
                    int reloadValue = amountAdded.nextInt();
                    phone.reload(reloadValue);
                    System.out.printf("New Balance: Php %.2f\n", phone.checkBalance());
                    break;
                case 5: //Network
                    //Display
                    System.out.println("Curent Network: " + phone.getNetwork());
                    System.out.println("Change Network");
                    System.out.println("1. Yes");
                    System.out.println("2. No");
                    System.out.printf("Input: ");
                    //Input
                    Scanner networkOption = new Scanner(System.in);
                    int choice = networkOption.nextInt();
                    if(choice == 1) {//Yes
                        //Display
                        System.out.println("Available networks: s, t, g");
                        System.out.println("Network Input: ");
                        //Input
                        char tempNetwork = phone.getNetwork();
                        Scanner networkAvailableOption = new Scanner(System.in);
                        phone.setNetwork(networkAvailableOption.next().charAt(0));
                        //Output
                        if(phone.getNetwork() == 's') System.out.println("Changed to network " + phone.getNetwork());
                        else if (phone.getNetwork() == 't') System.out.println("Changed to network " + phone.getNetwork());
                        else if (phone.getNetwork() == 'g') System.out.println("Changed to network " + phone.getNetwork());
                        else {
                            phone.setNetwork(tempNetwork);
                            System.out.println("Network remained as network " + phone.getNetwork() + ".");
                        }
                        break;
                    }
                case 6: exit = !exit;
            }
        } while(!exit);
    }
}