import java.io.FileWriter;
import java.io.IOException;

/**
 * @author Manuel Komann & Matthes Elstermann
 * @version 23-Feb-2018
 *
 * Template for exercise trajectory with methods
 *
 */
public class JavaToMaple{

    //global variables to save the trajectory data
    public static double t []  = new double[150]; //time
    public static double x []  = new double[150]; //x-coordinate
    public static double y []  = new double[150]; //y-coordintate

    //... space for other global variables





    /**
     *  Method for printing the global t, x and y- coordinate pairs
     *  to the console
     */
    public static void printToConsole(){
        // print t, x and y coordinate pairs
        // from arrays to shell area

        //... to be implemented

        for (int i = 0; i < t.length; i++) {
            System.out.println(t[i] + ", " + x[i] + ", " + y[i]);
        }
    }


    /**
     *  Method for calculating the trajectory
     */
    public static void calc(double v0, double t0, double alpha){
        for (int i = 0; i < t.length; i++) {
            t[i] = t0 + i;
            x[i] = v0 * t[i] * Math.cos(alpha);
            y[i] = v0 * t[i] * Math.sin(alpha) - 0.5 * 9.81 * t[i] * t[i];
        }
    }

    public static void main(String[] args){
        if (args.length >= 3) {
            System.out.println(args[0]);
            System.out.println(args[1]);
            System.out.println(args[2]);
        }

        // example for parsing the first input parameter
        // Warning: program will crash if no input parameter is given

        double V0 = Double.parseDouble(args[0]);
        double T0 = Double.parseDouble(args[1]);
        double a = Double.parseDouble(args[2]);

        //...implement further parsing and evaluation of args





        //calling mehtods
        calc(V0, T0, a);
        printToConsole();

        //saving the elements to the maple worksheet
        //uncomment to save to the maple sheet
        //for Praktomat-turn-in this must be commented out
        // (writing files is not allowed in test envoironment)
        // saveMaple("throw");
    }

    /**
     * Method that creates a new Maple-work sheet. (.mw file)
     * This method is complete! The details are not mandatory to be understood.
     *
     * @param title  - Name that the new Maple File will get
     */
    public static void saveMaple(String title){

        String plot = "restart; with(plots):A:=<<";

        //try-catch block: not relevant for exam,
        //but the preferred way to handle possible exceptions in JAVA
        //in this case if the computer fails to write a file for some reason
        try{
            //a class of the package IO for writing to text files
            FileWriter w = new FileWriter(title + ".mw");

            int i = 0;
            for(i = 0; i < t.length-1; i++){ plot = plot +  x[i] + ",";}
            plot = plot + x[i]+">|<";

            for(i = 0; i < t.length-1; i++){ plot = plot + y[i] + ",";}

            plot = plot + y[i]+">>:";
            plot = plot + "pointplot(A,color=blue,symbol=cross,labels=[distance,hight]);";

            w.append(plot);
            w.flush();
            w.close();

            System.out.println("\nFile saved as " + title);

        }catch(IOException e){e.printStackTrace();}
    }
}