examen.java

main.java

import java.io.*;
import java.util.Arrays;
import java.util.ArrayList;
import java.util.Collections;

//author: lion

public class main {

    private static String paths[] = {"coches.txt", "Ventas.txt", "vendedores.txt"}; // default files are these, assumed to be in the same directory

    //new String[3];

    private static String cars[][]; // bidimensional array to hold the cars data

    private static String sales[][]; // bidimensional array to hold the sales data

    private static String salesmen[][]; // bidimensional array to hold the salesmen data

    private static  String total_incomes[][] = {{"January", "0"}, // Array of Arrays in the form of {Month, Income}
                                                {"February", "0"},
                                                {"March", "0"},
                                                {"April", "0"},
                                                {"May", "0"},
                                                {"June", "0"},
                                                {"July", "0"},
                                                {"August", "0"},
                                                {"September", "0"},
                                                {"Octover", "0"},
                                                {"November", "0"},
                                                {"December", "0"}};

    private static BufferedReader stdin = new BufferedReader(new InputStreamReader(System.in));

    public static void getpaths() throws IOException { // allows the user to change the paths and names of the data files
        for (byte i = 0; i < 3; i++) {
            switch (i) {
                case 0:
                    System.out.println("cars file path:"); // everything else is pretty obvious
                    System.out.print("\t");
                    paths[i] = stdin.readLine();
                    break;

                case 1:
                    System.out.println("sales file path:");
                    System.out.print("\t");
                    paths[i] = stdin.readLine();
                    break;

                case 2:
                    System.out.println("salesmans file path:");
                    System.out.print("\t");
                    paths[i] = stdin.readLine();
                    break;
            }
        }
    }

    public static void parsecars() throws IOException { // this parses the cars data file into IDs, Make -cars_car-, Models and Prices ArrayList 

        ArrayList<String> cars_id    = new ArrayList<String>();
        ArrayList<String> cars_car   = new ArrayList<String>();
        ArrayList<String> cars_model = new ArrayList<String>();
        ArrayList<String> cars_price = new ArrayList<String>();

        String  line,
                darray[]  = null; // Array for each line of BufferedReader 
        File data         = new File (paths[0]); // opens the file for cars -in the path paths[0]-
        FileReader fr     = new FileReader(data); // reads
        BufferedReader br = new BufferedReader(fr); // lines

        while ((line = br.readLine()) != null) { // appends to each ArrayList
            darray = line.split(";");
            cars_id.add(darray[0]);
            cars_car.add(darray[1]);
            cars_model.add(darray[2]);
            cars_price.add(darray[3]);
        }

        cars = new String[cars_id.size()][4];

        for (byte i = 0; i < cars_id.size(); i++) {
            cars[i][0] = cars_id.get(i);
            cars[i][1] = cars_car.get(i);
            cars[i][2] = cars_model.get(i);
            cars[i][3] = cars_price.get(i);
        }
    }

    public static void parsesales() throws IOException { // parses data from the sales data file into IDs, Salesmen IDs, Cars IDs, amount of cars sold, date of the cars sold.

        ArrayList<String> sales_id          = new ArrayList<String>();
        ArrayList<String> sales_salesman    = new ArrayList<String>();
        ArrayList<String> sales_cars        = new ArrayList<String>();
        ArrayList<String> sales_cars_amount = new ArrayList<String>();
        ArrayList<String> sales_date        = new ArrayList<String>();

        String  line,
                darray[]  = null;
        File data         = new File (paths[1]);
        FileReader fr     = new FileReader(data);
        BufferedReader br = new BufferedReader(fr);

        while ((line = br.readLine()) != null) {
            darray = line.split(";");
            sales_id.add(darray[0]);
            sales_salesman.add(darray[1]);
            sales_cars.add(darray[2]);
            sales_cars_amount.add(darray[3]);
            sales_date.add(darray[4]);
        }

        sales = new String[sales_id.size()][5];

        for (byte i = 0; i < sales_id.size(); i++) {
            sales[i][0] = sales_id.get(i);
            sales[i][1] = sales_salesman.get(i);
            sales[i][2] = sales_cars.get(i);
            sales[i][3] = sales_cars_amount.get(i);
            sales[i][4] = sales_date.get(i);
        }
    }

    public static void parsesalesmans() throws IOException { //parses data from the salesmen data file into IDs and names

        ArrayList<String> salesmans_id   = new ArrayList<String>();
        ArrayList<String> salesmans_name = new ArrayList<String>();

        String  line,
                darray[]  = null;
        File data         = new File (paths[2]);
        FileReader fr     = new FileReader(data);
        BufferedReader br = new BufferedReader(fr);

        while ((line = br.readLine()) != null) {
            darray = line.split(";");
            salesmans_id.add(darray[0]);
            salesmans_name.add(darray[1]);
        }

        salesmen = new String[salesmans_id.size()][2];

        for (byte i = 0; i < salesmans_id.size(); i++) {
            salesmen[i][0] = salesmans_id.get(i);
            salesmen[i][1] = salesmans_name.get(i);
        }
    }

    public static void parseincomes() throws IOException { // fills in the total_incomes array
        int car,
            car_amount,
            car_price            = 0,
            current_income       = 0,
            sale_total,
            current_month;
        
        String current_date[]   = null;

        for (byte i = 0; i < sales.length; i++) {

            current_date = sales[i][4].split("/");
            current_month = Integer.parseInt(current_date[1]);

            car        = Integer.parseInt(sales[i][2]);
            car_amount = Integer.parseInt(sales[i][3]);

            for (byte j = 0; j < cars.length; j++) {
                if (car == Integer.parseInt(cars[j][0])) {
                    car_price = Integer.parseInt(cars[j][3]);
                }
            }

            sale_total = car_amount * car_price;

            current_income = Integer.parseInt(total_incomes[current_month][1]);
            current_income = current_income + sale_total;

            total_incomes[current_month][1] = Integer.toString(sale_total);
        }
    }

    public static void mostsold() throws IOException { // looks for the most sold model
        int index              = 0,
            highest_amount     = 0, 
            total_sold[]       = new int[cars.length];

        byte count = 0;

        String most_sold_car;

        for (byte i = 1; i <= cars.length; i++) {

            for (byte j = 0; j < sales.length; j++) {

                if (i == Integer.parseInt(sales[j][2])) {
                    total_sold[count] = total_sold[count] + Integer.parseInt(sales[j][3]);
                }
            }
            count++;
        }

        for (int i = 0; i < total_sold.length; i++) {
            if (highest_amount < total_sold[i]) {
                highest_amount = total_sold[i];
                index          = i;
            }
        }

        most_sold_car = cars[index][1] + " " + cars[index][2];

        System.out.println("Most sold car:\n"+most_sold_car+". With "+highest_amount+" units sold.");
    }

    public static void bestsalesman() { // looks for the best salesman
        int index          = 0,
            highest_amount = 0,
            total_sales[]  = new int[salesmen.length];

        byte    count      = 0,
                car_count  = 0;

        for (byte i = 1; i <= salesmen.length; i++) {

            for (byte j = 0; j < sales.length; j++) {
                
                   if (i == Integer.parseInt(sales[j][1])) {

                    for (byte k = 0; k < cars.length; k++) {
                        if (Integer.parseInt(sales[j][2]) == Integer.parseInt(cars[k][0])) {                                            // if sales[j] ID equals cars[k] ID
                            total_sales[count] = total_sales[count] + ((Integer.parseInt(sales[j][3]))*(Integer.parseInt(cars[k][3]))); // we add the value of carks[k]price * sales[j]amount to current total sold
                        }
                        car_count++;
                    }
                    total_sales[count] = total_sales[count] + Integer.parseInt(sales[j][3]);
                    car_count = 0;
                }
            }
            count++;
        }

        for (int i = 0; i < total_sales.length; i++) {
            if (highest_amount < total_sales[i]) {
                highest_amount = total_sales[i];
                index = i;
            }
        }

        System.out.println("Best Salesman:\n"+salesmen[index][1]+". With a total of "+highest_amount+"$ cashed in.");
    }

    public static void monthlyincome() { // looks for the month with the highest income
        int index          = 0,
            highest_amount = 0;

        for (byte i = 0; i < 12; i++) {

            if (highest_amount < Integer.parseInt(total_incomes[i][1])) { // if current highest_amount is lower than the income found in total_incomes[i][1], 
                index          = i-1;                                     // we store i in the index (minus 1) to know which is the current max
                highest_amount = Integer.parseInt(total_incomes[i][1]);   // and highest amount is replaced
            }
        }

        System.out.println("Highest grossing month is:\n"+total_incomes[index][0]+". With a total amount of "+total_incomes[index][1]+"$.");
    }

    public static void start() throws IOException { // main loop
        String input;
        byte choice;
        System.out.println("0-Most sold model.\n1-Best Salesman\n2-Best Month Ever\n3-Income Per Month\n4-Change path for files\n5-Reparse\nAny other number will quit");

        System.out.println();
        System.out.print(">");

        input  = stdin.readLine();
        choice = Byte.parseByte(input);

        System.out.println();

        switch (choice) {
            case 0:
                mostsold();
                break;
            case 1:
                bestsalesman();
                break;
            case 2:
                monthlyincome();
                break;
            case 3:
                System.out.println(Arrays.deepToString(total_incomes));
                break;
            case 4:
                getpaths();
                break;
            case 5:
                parsecars();
                parsesales();
                parsesalesmans();
                parseincomes();
                break;
            default:
                System.exit(0);
        }
    }

    public static void main(String[] args) throws IOException {
        parsecars();
        parsesales();
        parsesalesmans();
        parseincomes();

        System.out.println(Arrays.deepToString(cars));
        System.out.println(Arrays.deepToString(salesmen));
        System.out.println(Arrays.deepToString(sales));

        while(true) {
            start();
            System.out.println();
        }
    }
}