import java.io.*;
public class EmissionsCalculator//program to take inputs from CSV file and print output
{
    String file="src\\Sheet1.csv";//file source location
    int n=10;
    int choice[]=new int[n];//array to store choice of method
    double arr1[]=new double[n];//array to store first column of data
    double arr2[]=new double[n];//array to store second column of data
    double arr3[]=new double[n];//array to store third column of data
    double emissionFB=0.0,emissionDB=0.0,emissionSB=0.0;
    String GREEN="\u001B[32m", YELLOW="\u001B[33m", RED="\u001B[31m",RESET="\u001B[0m";//defining ANSI colours for colour-coding outputs
    void input() throws IOException//method to read csv file and extract data
    {
        int i=0;
        BufferedReader br=null;
        String line="";
        try//to eliminate all kinds of exceptions thrown by compiler
        {
            br=new BufferedReader(new FileReader(file));
            while ((line=br.readLine())!=null)
            {
                String[] row=line.split(",");//segregating data separated by commas
                choice[i]=Integer.parseInt(row[0]);
                arr1[i]=Double.parseDouble(row[1]);
                arr2[i]=Double.parseDouble(row[2]);
                arr3[i]=Double.parseDouble(row[3]);
                i++;
            }
        }
        catch (Exception e)//to catch and assess exceptions
        {
            e.printStackTrace();
        }
        finally
        {
            for (int j=1;j<i;j++) {
                switch (choice[j]) {
                    case 1:
                        calculateFuelBased(arr1[i], arr2[i], arr3[i]);
                        break;
                    case 2:
                        calculateDistanceBased(arr1[i], arr2[i], arr3[i]);
                        break;
                    case 3:
                        calculateSpendBased(arr1[i], arr2[i]);
                        break;
                    default:
                        System.out.println(RED + "Error!! Wrong Choice!!" + RESET);
                }
            }
            try
            {
                br.close();//closing BufferedReader object
            }
            catch (Exception e)
            {
                e.printStackTrace();
            }
        }
    }
    void calculateFuelBased(double emissfactor,double distance,double efficiency)//to calculate fuel-based emissions
    {
        emissionFB=emissfactor*(distance/efficiency);
        display(emissionFB);
    }
    void calculateDistanceBased(double mass, double distance, double factor)//to calculate distance-based emissions
    {
        emissionDB=mass*distance*factor;
        display(emissionDB);
    }
    void calculateSpendBased(double expenditure, double efspend)//to calculate spend-based emissions
    {
        emissionSB=expenditure*efspend;
        display(emissionSB);
    }
    void display(double d)//method to display colour-coded output
    {
        if (d <=50)
        {
            System.out.printf (GREEN+"\nEmissions= %.2fkg CO2.\n"+RESET,d);
            System.out.println (GREEN+"Thank you for your contribution. Keep it up!!"+RESET);
        }
        else if (d>50 && d<=200)
        {
            System.out.printf (GREEN+"\nEmissions= %.2fkg CO2.\n"+RESET,d);
            System.out.println (GREEN+"Good going!! In addition, please try to optimise logistics and reduce empty miles."+RESET);
        }
        else if (d>200 && d<=500)
        {
            System.out.printf (YELLOW+"\nEmissions= %.2fkg CO2.\n"+RESET,d);
            System.out.println (YELLOW+"Do consider hybrids or biofuel compatible vehicles for your next purchase."+RESET);
        }
        else
        {
            System.out.printf (RED+"\nEmissions= %.2fkg CO2.\n"+RESET,d);
            System.out.println (RED+"Consider shifting to public transport or using EVs."+RESET);
        }
    }
    public static void main(String args[]) throws IOException//main method
    {
        EmissionsCalculator ob = new EmissionsCalculator();
        ob.input();
    }
}