import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.util.*;
import java.io.*;

public class StudentGui
{
    //Container contents;
    private CardLayout contents = new CardLayout();

    JFrame frame = new JFrame("Student Course Scheduler");

    //Panels for different cards and cardlayout hoster
    JPanel cont = new JPanel();
    JPanel maingui = new JPanel();
    JPanel coursechange = new JPanel();

    //ArrayList for loading and controlling the JList information
    Map<String, course> ccm = new HashMap<>();
    private DefaultListModel<String> mcc = new DefaultListModel<>();
    private DefaultListModel<String> mcsc = new DefaultListModel<>();
    private ArrayList<String> list = new ArrayList<>();
    private int control;

    //GUI components for Main
    private JButton coursechanger,trackreqs;
    private ImageIcon studentphoto;
    private JLabel studentname;

    //GUI components for course change
    private JButton AddCourse;
    private JButton Back;
    private JLabel CourseCat;
    private JList<String> CourseCatalog;
    private JLabel Courseselec;
    private javax.swing.JLabel CurrentCour;
    private javax.swing.JList<String> CurrentCourses;
    private javax.swing.JButton DeleteCourse;
    private javax.swing.JScrollPane jScrollPane1;
    private javax.swing.JScrollPane jScrollPane2;
    private JOptionPane getbettergrades;
    private JOptionPane yaho;
    private JOptionPane track;

    //student transitional variable to modify current courses of student temp
    student x;




    public StudentGui(student temp)
    {
        x = temp;
        //adds the card layout
        cont.setLayout(contents);

        //initializes most of the necessary components for the courseselction part of the GUI
        updateJList(temp); //updates the JList according to the student's files
        initComponents();

        //adds the first JPanel
        updateMain(temp);

        //adds the second JPanel
        updatecoursechange();

        //shows the main gui as the first thing you see when launching student gui
        contents.show(cont, "1");
        frame.add(cont);
        frame.pack();
        frame.setVisible(true);

    }

    public void updateJList(student x)
    {
        //adds the course catalog
        String text2;
        try (Scanner courseinit = new Scanner(new File("CurrentCourseList.txt"))) {
            while (courseinit.hasNextLine()) {
                text2 = courseinit.nextLine();
                processLine(text2);
            }
        } catch (IOException exp) {
            exp.printStackTrace();
        }

        ArrayList<course> temp = x.getCurrentcourses();
        for(int i = 0; i < temp.size(); i++)
        {
            mcsc.addElement(temp.get(i).getName());
        }


    }

    //initializes all the J Components etc
    private void initComponents()
    {

        jScrollPane1 = new javax.swing.JScrollPane();
        CourseCatalog = new javax.swing.JList<>(mcc);
        jScrollPane2 = new javax.swing.JScrollPane();
        CurrentCourses = new javax.swing.JList<>(mcsc);
        CourseCat = new javax.swing.JLabel();
        CurrentCour = new javax.swing.JLabel();
        AddCourse = new javax.swing.JButton();
        DeleteCourse = new javax.swing.JButton();
        Courseselec = new javax.swing.JLabel();
        Back = new javax.swing.JButton();
        getbettergrades = new JOptionPane();
        yaho = new JOptionPane();
        track = new JOptionPane();

        frame.setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

        jScrollPane1.setViewportView(CourseCatalog);

        jScrollPane2.setViewportView(CurrentCourses);

        control = 0;

        CourseCat.setText("CourseCatalog");

        CurrentCour.setText("Current Courses");

        AddCourse.setText("Add Course");
        AddCourse.addActionListener(new MyHandler());


        DeleteCourse.setText("Delete Course");
        DeleteCourse.addActionListener(new MyHandler());



        Courseselec.setText("Course Selector");

        Back.setText("Back");
        Back.addActionListener(new MyHandler());

    }

    //button traffic handler
    private class MyHandler implements ActionListener
    {
        public void actionPerformed(ActionEvent ae)
        {
            //placeholder variables
            int temp;
            String temp2;
            course temp3;

            //back pressed go back to Student Page
            if(ae.getSource() == Back)
            {
                contents.show(cont, "1");
            }
            //if trackreqs is pressed
            if(ae.getSource() == trackreqs)
            {
                track.showMessageDialog(maingui, "Not ready yet");
            }
            //switches to course changer pane
            if(ae.getSource() == coursechanger)
            {
                contents.show(cont, "2");
            }

            //deletes the course
            if(ae.getSource() == DeleteCourse)
            {
                temp = CurrentCourses.getSelectedIndex();
                if(temp == -1)
                {
                    //do nothing
                }
                else
                {
                    temp2 = mcsc.getElementAt(temp);
                    mcsc.remove(temp);

                    System.out.print(temp2);

                    //deletes the course from the student file
                    DeleteCourse(temp2);
                }
            }

            //adds a course
            if(ae.getSource() == AddCourse)
            {
                temp = CourseCatalog.getSelectedIndex();
                temp2 = CourseCatalog.getSelectedValue();
                temp3 = ccm.get(temp2);

                if(temp3 == null)
                {
                    //do nothing
                }
                //if it satisfies the course requirements and the student isn't already taking the course
                else if(temp3.getgpareq() <= x.getGpa() && !mcsc.contains(temp2))
                {
                    mcsc.addElement(temp2);
                    AddCourse(mcc.getElementAt(temp));
                }
                else if (mcsc.contains(temp2))
                {
                    yaho.showMessageDialog(coursechange, "You already have one of these courses");
                }
                else
                {
                    getbettergrades.showMessageDialog(coursechange, "Get better grades");
                }
                control = 0;
                list.clear();

            }

        }
    }
    //updates first panel and initializes the necessary variables
    public void updateMain(student temp)
    {
        coursechanger = new JButton("Manage your courses");
        coursechanger.addActionListener(new MyHandler());
        maingui.add(coursechanger);
        trackreqs = new JButton("track reqs");
        maingui.add(trackreqs);
        cont.add(maingui,"1");

    }

    //update second panel
    public void updatecoursechange()
    {
        GroupLayout layout = new GroupLayout(coursechange);
        layout.setHorizontalGroup
                (
                        layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                                .addGroup(layout.createSequentialGroup()
                                        .addGap(29, 29, 29)
                                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                                                .addGroup(layout.createSequentialGroup()
                                                        .addComponent(CourseCat)
                                                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
                                                .addGroup(layout.createSequentialGroup()
                                                        .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 115, javax.swing.GroupLayout.PREFERRED_SIZE)
                                                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                                                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                                                                .addComponent(DeleteCourse, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                                                                .addComponent(AddCourse, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                                                                .addComponent(Back, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
                                                        .addGap(31, 31, 31)))
                                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                                                .addComponent(jScrollPane2, javax.swing.GroupLayout.PREFERRED_SIZE, 116, javax.swing.GroupLayout.PREFERRED_SIZE)
                                                .addComponent(CurrentCour))
                                        .addGap(83, 83, 83))
                                .addGroup(layout.createSequentialGroup()
                                        .addGap(193, 193, 193)
                                        .addComponent(Courseselec)
                                        .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
                );
        layout.setVerticalGroup
                (
                        layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                                .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                                        .addComponent(Courseselec)
                                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 37, Short.MAX_VALUE)
                                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                                                .addComponent(CourseCat)
                                                .addComponent(CurrentCour))
                                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
                                                .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 175, javax.swing.GroupLayout.PREFERRED_SIZE)
                                                .addComponent(jScrollPane2, javax.swing.GroupLayout.PREFERRED_SIZE, 175, javax.swing.GroupLayout.PREFERRED_SIZE)
                                                .addGroup(layout.createSequentialGroup()
                                                        .addComponent(AddCourse)
                                                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                                                        .addComponent(DeleteCourse)
                                                        .addGap(48, 48, 48)
                                                        .addComponent(Back)))
                                        .addGap(49, 49, 49))
                );
        cont.add(coursechange, "2");
    }

    //process the course files to add to the JList line by line
    public void processLine(String text)
    {
        String tempname;
        int tempmax;
        int tempmin;
        double tempgpareg;
        ArrayList<Integer> tempperiodsO = new ArrayList<>();

        Scanner linescan = new Scanner(text);
        tempname = linescan.next();
        tempmax = linescan.nextInt();
        tempmin = linescan.nextInt();
        tempgpareg = linescan.nextDouble();
        while(linescan.hasNextInt())
        {
            tempperiodsO.add(linescan.nextInt());
        }

        course x = new course(tempname, tempmax, tempmin, tempgpareg, tempperiodsO);
        mcc.addElement(x.getName());
        ccm.put(x.getName(), x);


    }

    //method to delete a course from the file
    public void DeleteCourse(String del)
    {
        String charset = "UTF-8";
        String delete = del;
        String newtext = null;
        try
        {
            File file = new File("CurrentStudentList.txt");
            BufferedReader reader = new BufferedReader(new FileReader(file));
            String line = "";
            String txt = "";
            while((line = reader.readLine()) != null)
            {
                txt += line + "\r\n";
            }
            reader.close();
            // replace a word in a file
            if(control == 0)
            {
                newtext = txt.replaceAll(delete, "");

            }

            FileWriter writer = new FileWriter("CurrentStudentList.txt");
            writer.write(newtext);writer.close();
        }
        catch (IOException ioe)
        {
            ioe.printStackTrace();
        }
    }

    //method to add a course into the file
    public void AddCourse(String add)
    {
        String text2;
        BufferedWriter writer = null;
        try (Scanner courseinit = new Scanner(new File("CurrentStudentList.txt")))
        {
            while (courseinit.hasNextLine())
            {
                text2 = courseinit.nextLine();
                //System.out.println(text2);
                processLine2(text2, add);
            }
            writer = new BufferedWriter(new FileWriter("CurrentStudentList.txt"));
            for (int i = 0; i < list.size(); i++) {
                //System.out.println(list.get(i));
                writer.write(list.get(i) + "\r\n");
            }
            writer.close();
        }
        catch (IOException exp)
        {
            exp.printStackTrace();
        }

    }
    public void processLine2(String text, String add)
    {
        Scanner linescan = new Scanner(text);
        Boolean check = false;
        ArrayList<String> temp4 = new ArrayList<>();
        String temp;
        while(linescan.hasNext())
        {
            temp = linescan.next();
            temp4.add(temp);
            if(temp4.contains(x.getname()))
            {
                check = true;
            }

        }
        if(check = true && control == 0)
        {
            temp4.add(add);
            control++;
            check = false;
        }
        String list2 = fixarraytostring(temp4);
        list.add(list2);
    }

    //changes ArrayList to a printable string form or to be used for file scanning
    public String fixarraytostring(ArrayList<String> x)
    {
        String temp = Arrays.toString(x.toArray()).replace("[", "").replace("]", "").replace(",","");
        return temp;
    }





}