import java.awt.Dimension;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowEvent;
import java.awt.event.WindowListener;
import java.io.BufferedInputStream;
import java.io.BufferedWriter;
import java.io.FileInputStream;
import java.io.FileWriter;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;

import javax.swing.BoxLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;

/**
 *
 * @author Phantom6208
 * @version 1.2
 *
 * This Program asks the user simple questions and saves it in a file.
 *
 * Than it trys to compare the results to the results in the file.
 * If one of the results match, it says a welcome back
 *
 * in version 1.3: If one result is more than 80% same and the result with the most percent, it promts a window with 'Welcome back user...'
 *
 */
public class Window extends JFrame implements ActionListener {
    /**
     * Yes button (in question window)
     */
    private JButton yes;
    /**
     * No button (in question window)
     */
    private JButton no;

    /**
     * This label shows the actual question
     */
    private JLabel question;

    /**
     * The panel witch get added to window
     */
    private JPanel panel;
    /**
     * Panel witch holds question.
     * Get added to panel
     */
    private JPanel panel1;
    /**
     * Panel witch holds the yes and no button.
     * Get added to panel
     */
    private JPanel panel2;

    /**
     * Layout (GridLayout), get applied to panel
     */
    private GridLayout layout;

    /**
     * Array of questions, in next version loaded by file
     */
    private String[] questions = {
        "This is a test question, please press 'YES'.",
        "This is a test question, please press 'NO'.",
        "This is a test question, please press what you want to.",
        "Did you ever travel to London?",
        "Did you ever killed a person?",
        "Did you ever broke a leg?",
        "Do you have more than 10$ in your pocket?",
        "Do you like this program?"
    };

    /**
     * Index of actual question
     */
    private int qNumber;

    /**
     * Saves users answers as string.
     * 1 = yes, 0 = no
     */
    private String tempID;

    /**
     * Main function, creates window and nothing else.
     * @param args
     */
    public static void main(String args[]) {
        JFrame frame = new Window();
    }

    /**
     * Window Class, creates the question window.
     */
    public Window() {
        System.out.println("[INFO] Starting program...");

        tempID = "";

        yes = new JButton("Yes");
        no = new JButton("No");

        question = new JLabel("undefined");

        panel = new JPanel();
        panel1 = new JPanel();
        panel2 = new JPanel();

        layout = new GridLayout(2, 0);

        // ---
        /**
         * Adds ActionListener to buttons yes and no.
         */
        yes.addActionListener(this);
        no.addActionListener(this);

        // ---

        /**
         * Adds components to panels
         */
        panel1.add(question);

        panel2.add(yes);
        panel2.add(no);

        panel.setLayout(layout);
        panel.add(panel1);
        panel.add(panel2);

        /**
         * Adds panel to window
         */
        add(panel);

        // ---

        /**
         * Sets question text; sets Question index to 1
         */
        question.setText(questions[0]);
        qNumber = 1;

        // ---

        /**
         * Set window Title
         */
        setTitle("Question Game");

        /**
         * Set window location and its size
         */
        setLocation(100, 100);
        setSize(new Dimension(500, 95));
        /**
         * Since now window is not resizeable (size by user editable)
         */
        setResizable(false);

        /**
         * Makes window visible on screen.
         */
        setVisible(true);
    }

    @Override
    /**
     * Catches Button-Events
     */
    public void actionPerformed(ActionEvent event) {
        /**
         * If button yes get pressed.
         */
        boolean action = false;
        if(event.getSource() == yes) { action = true; }
        if(event.getSource() == no) { action = false; }

        /**
         * Saves user input in tempID
         */
        if(action) {
            tempID += 1;
            System.out.println("[INFO] User pressed 'YES' for question " + qNumber);
        }
        else {
            tempID += 0;
            System.out.println("[INFO] User pressed 'NO' for question " + qNumber);
        }

        try {
            /**
             * try to set new question;
             * count question index up
             */
            question.setText(questions[qNumber]);
            qNumber++;
        /**
         * executed if index runs out of range (all questions answerd)
         */
        } catch(Exception e) {
            if(questions.length == qNumber) {
                System.out.println("[INFO] User finished all questions.");
            } else {
                /**
                 * If its not the last question, throws error
                 */
                System.out.println("[ERROR] Unknown error.");
                e.printStackTrace();
            }

            try {
                /**
                 * Creates scanner to search users file.
                 */
                Scanner scanner=new Scanner(new File("users.csv"));

                boolean found = false;

                /**
                 * List of matches
                 */
                ArrayList<String[]> matches = new ArrayList();

                /**
                 * While scanner doesn't reach the end
                 */
                while(scanner.hasNextLine()) {
                    String nextLine = scanner.nextLine();
                    /**
                     * If the user input matches 80% or more.
                     */
                    if(testSameUser(tempID, nextLine.split(";")[1]) >= 0.8){
                        System.out.println("[INFO] User maybe identificated: user" + nextLine.split(";")[0]);

                        found = true;
                        /**
                         * Saves userID
                         */
                        String[] tempList = new String[2];
                        tempList[0] = nextLine.split(";")[0];
                        tempList[1] = String.valueOf(testSameUser(tempID, nextLine.split(";")[1].toString()));
                        matches.add(tempList);
                    }
                }

                if(!found) {
                    /**
                     * Opens users.csv file for reading
                     */
                    BufferedWriter users = new BufferedWriter(new FileWriter("users.csv", true));
                    /**
                     * Writes information about new user (userid, answers)
                     */
                    users.write(countLines("users.csv")+1 + ";" + tempID + "\r\n");
                    users.close();
                } else {
                    String[][] matchesArray = new String[matches.size()][2];

                    for(int i=0; i<matches.size(); i++) {
                        matches.get(0);
                    }

                    double max = Double.parseDouble(matchesArray[0][1]);
                    int maxindex = 0;

                    for ( int i = 1; i < matches.size(); i++) {
                        if ( Double.parseDouble(matchesArray[i][1]) > max) {
                            max = Double.parseDouble(matchesArray[i][1]);
                            maxindex = i;
                        }
                    }

                    System.out.println("[INFO] User possibly identificated: user" + matchesArray[maxindex][0]);

                    new PromtWindow("I know who you are!", "I've identificated you, " + matchesArray[maxindex][0] + "!");
                }

                scanner.close();
            } catch (Exception exc) {
                System.out.println("[ERROR] can't save answers");
                exc.printStackTrace();
            }
            System.out.println("[INFO] Exit program...");
            dispose();
        }
    }

    /**
     * Tests how many percent of user1 and user2 are the same.
     * @param user1
     * @param user2
     * @return
     */
    public double testSameUser(String user1, String user2) {
        /**
         * throws error, if user1 and user2 have different lengths
         */
        if(user1.length() != user2.length()) {
            System.out.println("[ERROR] Uservalues don't have the same length!");
            /**
             * exit function (program still runs)
             */
            return 0F;
        }

        double sameAnswers = 0;

        /**
         * converts user1 and user2 from string to char arrays
         */
        char[] user1char = user1.toCharArray();
        char[] user2char = user2.toCharArray();

        for(int i=0; i<user1.length(); i++) {
            if(user1char[i] == user2char[i]) {
                sameAnswers++;
            }
        }

        /**
         * divides sameAnswers/length = percent of right answers
         */
        return sameAnswers/user1.length();
    }

    /**
     * This function counts the lines of a file.
     * I don't made this function, i found it on <a href="stackoverflow.com">stackoverflow.com</a>
     * @param filename
     * @return
     * @throws IOException
     */
    public static int countLines(String filename) throws IOException {
        InputStream is = new BufferedInputStream(new FileInputStream(filename));
        try {
            byte[] c = new byte[1024];
            int count = 0;
            int readChars = 0;
            boolean empty = true;
            while ((readChars = is.read(c)) != -1) {
                empty = false;
                for (int i = 0; i < readChars; ++i) {
                    if (c[i] == '\n') {
                        ++count;
                    }
                }
            }
            return (count == 0 && !empty) ? 1 : count;
        } finally {
            is.close();
        }
    }
}

/**
 * This class opens a little promt-window with text and a 'OK' button.
 * @author Phantom6208
 *
 */
class PromtWindow extends JFrame implements ActionListener {

    /**
     * Creates variables
     */
    private JButton ok;
    private JLabel label;
    private JPanel panel;
    private BoxLayout layout;

    /**
     * Constructor
     * @param windowTitle
     * @param promt
     */
    public PromtWindow(String windowTitle, String promt) {
        /**
         * Creates label, button, panel and layout
         */
        ok = new JButton("OK");
        label = new JLabel(promt + "      ");
        panel = new JPanel();
        layout = new BoxLayout(panel, BoxLayout.LINE_AXIS);

        // ---

        /**
         * Adds ActionListener to catch inputs.
         */
        ok.addActionListener(this);

        // ---

        /**
         * Sets layout of panel; Adds components to panel.
         */
        panel.setLayout(layout);

        panel.add(label);
        panel.add(ok);

        add(panel);

        // ---

        /**
         * Sets window title, its location, its size and if its resizeable
         */
        setTitle(windowTitle);

        setLocation(100, 100);
        setSize(new Dimension(200, 75));
        setResizable(false);

        /**
         * Makes window visible
         */
        setVisible(true);

    }

    @Override
    /**
     * If user press ok -> window get closed.
     */
    public void actionPerformed(ActionEvent e) {
        if(e.getSource() == ok) {
            this.dispose();
        }
    }
}