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package derivata;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.logging.Level;
import java.util.logging.Logger;

/**
 *
 * @author Lars
 */
public class Derivata {

    // static ArrayList<Integer> pos = new ArrayList<>();
    static ArrayList<String> exp = new ArrayList<>();
    static ArrayList<Integer> ix = new ArrayList<>();
    static ArrayList<Integer> posx = new ArrayList<>();
    static ArrayList<Integer> posi = new ArrayList<>();
    static String nameOfFunction = "F" + "'" + "() = ";

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        try {
            String ekvation;
            BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
            System.out.println("skriv in giltig ekvation, för upphöjt använd ^, logaritmiska lösningar eventuella naturliga logaritmer går ej att använda eg. E^Kx or lg^X or x^Kx \n"
                    + "Ex. x^(51)*8x^(5)");
            ekvation = br.readLine();
            int size = ekvation.length() + 1;
            int relativ = 0;
            for (int i = 0; i < ekvation.length(); i++) {
                String pos = "";
                if (ekvation.charAt(i) == '(') {
                    int x = i + 1;
                    posx.add(x - 1);
                    while (ekvation.charAt(x) != ')') {
                        System.out.println("First cordinate of exp: " + x);
                        pos += ekvation.charAt(x);
                        posi.add(x);
                        x++;
                    }
                    exp.add(pos);
                    for (String s : exp) {
                        int ref = Integer.parseInt(s);
                        ref += - 1;
                        ix.add(ref);
                    }
                }
            }
            for (int i = 0; i < posi.size(); i++) {
                System.out.println(posi.get(i));
                ekvation = removeCharAt(ekvation, posi.get(i) - i);
            }
            for (int x = 0; x < posx.size(); x++) {
                System.out.println(posx.size() + ' ' + ix.size());
                ekvation = new StringBuffer(ekvation).insert(posx.get(x) + 1, ix.get(x + 1).toString()).toString();
            }
            for (int x = 0; x < posx.size(); x++) {
                relativ = ekvation.length() - size;
                ekvation = new StringBuffer(ekvation).insert(posx.get(x) + relativ, "*" + exp.get(x).toString()).toString();
                System.out.println("l: " + ekvation.length() + " planned offset: " + relativ);
            }
            System.out.println(nameOfFunction + ekvation);
        } catch (IOException ex) {
            Logger.getLogger(Derivata.class.getName()).log(Level.SEVERE, null, ex);
        }
    }

    public static String removeCharAt(String s, int pos) {
        return s.substring(0, pos) + s.substring(pos + 1);
    }
}