/* 
 * Apocalypse Laboratories
 * Open Source License
 * 
 * Source code can be used for any purpose, as long as:
 *  - Compiled binaries are rebranded and trademarks are not
 *    visible by the end user at any time, except to give
 *    credit to Apocalypse Laboratories, such as by showing
 *    "Based on <product> by Apocalypse Laboratories" or a
 *    similar notice;
 *  - You do not use the code for evil;
 *  - Rebranded compiled applications have significant
 *    differences in functionality;
 *  - and you provide your modified source code for download,
 *    under the terms of the GNU LGPL v3 or a comparable
 *    license.
 * 
 * Compiled binaries cannot be redistributed or mirrored,
 * unless:
 *  - You have written permission from Apocalypse Laboratories;
 *  - Downloads are not available from Apocalypse Laboratories,
 *    not even behind a paywall or other blocking mechanism;
 *  - or you have received a multi-computer license, in which
 *    case you should take measures to prevent unauthorized
 *    downloads, such as preventing download access from the 
 *    Internet.
 */
package net.apocalypselabs.symat;

import java.awt.Font;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.PrintStream;
import java.nio.charset.Charset;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.JFileChooser;
import javax.swing.JOptionPane;
import javax.swing.JScrollPane;
import javax.swing.JTextPane;
import javax.swing.filechooser.FileFilter;
import javax.swing.filechooser.FileNameExtensionFilter;
import javax.swing.text.AttributeSet;
import javax.swing.text.SimpleAttributeSet;
import javax.swing.text.StyleConstants;
import javax.swing.text.StyleContext;
import javax.swing.text.TabSet;
import javax.swing.text.TabStop;

/**
 *
 * @author Skylar
 */
public class CodeEditor extends javax.swing.JInternalFrame {

    private final JFileChooser fc = new JFileChooser();
    private boolean isSaved = false;
    private final JTextPane codeBox = new JTextPane();
    private final TextLineNumber tln;
    private String lastSaved = "";

    /**
     * Creates new form CodeEditor
     */
    public CodeEditor() {
        initComponents();
        FileFilter filter = new FileNameExtensionFilter("SyMAT script (.symt)", "symt");
        fc.setFileFilter(filter);
        fc.addChoosableFileFilter(filter);
        filter = new FileNameExtensionFilter("JavaScript file (.js)", "js");
        fc.addChoosableFileFilter(filter);
        filter = new FileNameExtensionFilter("MeetLeeb script (.mls)", "mls");
        fc.addChoosableFileFilter(filter);
        int font_size = 12;
        try {
            font_size = Integer.valueOf(PrefStorage.getSetting("editor-fontsize"));
        } catch (Exception ex) {
        }
        codeBox.setFont(new Font(Font.MONOSPACED, Font.PLAIN, font_size));
        TabStop[] tabs = new TabStop[30];
        for (int i = 0; i < tabs.length; i++) {
            tabs[i] = new TabStop(15 * i, TabStop.ALIGN_RIGHT, TabStop.LEAD_NONE);
        }
        TabSet tabset = new TabSet(tabs);
        StyleContext sc = StyleContext.getDefaultStyleContext();
        AttributeSet aset = sc.addAttribute(SimpleAttributeSet.EMPTY,
                StyleConstants.TabSet, tabset);
        codeBox.setParagraphAttributes(aset, false);
        tln = new TextLineNumber(codeBox);
        scrollPane.setRowHeaderView(tln);
        codeBox.setVisible(true);
        tln.setVisible(true);
        codeBox.requestFocus();
    }

    /**
     * This method is called from within the constructor to initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is always
     * regenerated by the Form Editor.
     */
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">//GEN-BEGIN:initComponents
    private void initComponents() {

        jMenuItem4 = new javax.swing.JMenuItem();
        jMenuBar2 = new javax.swing.JMenuBar();
        jMenu3 = new javax.swing.JMenu();
        jMenu4 = new javax.swing.JMenu();
        jPanel1 = new javax.swing.JPanel();
        jSplitPane1 = new javax.swing.JSplitPane();
        scrollPane = new JScrollPane(codeBox);
        jPanel2 = new javax.swing.JPanel();
        jLabel1 = new javax.swing.JLabel();
        jScrollPane1 = new javax.swing.JScrollPane();
        outputPane = new javax.swing.JTextArea();
        jMenuBar1 = new javax.swing.JMenuBar();
        jMenu1 = new javax.swing.JMenu();
        jMenuItem1 = new javax.swing.JMenuItem();
        jMenuItem2 = new javax.swing.JMenuItem();
        jMenuItem3 = new javax.swing.JMenuItem();
        jMenuItem8 = new javax.swing.JMenuItem();
        jMenu5 = new javax.swing.JMenu();
        jMenuItem6 = new javax.swing.JMenuItem();
        jMenuItem7 = new javax.swing.JMenuItem();
        jMenu2 = new javax.swing.JMenu();
        jMenuItem5 = new javax.swing.JMenuItem();

        jMenuItem4.setText("jMenuItem4");

        jMenu3.setText("File");
        jMenuBar2.add(jMenu3);

        jMenu4.setText("Edit");
        jMenuBar2.add(jMenu4);

        setClosable(true);
        setIconifiable(true);
        setMaximizable(true);
        setResizable(true);
        setTitle("Editor");
        setFrameIcon(new javax.swing.ImageIcon(getClass().getResource("/net/apocalypselabs/symat/icons/editor.png"))); // NOI18N

        jSplitPane1.setDividerLocation(275);
        jSplitPane1.setDividerSize(3);
        jSplitPane1.setOrientation(javax.swing.JSplitPane.VERTICAL_SPLIT);
        jSplitPane1.setResizeWeight(0.7);

        scrollPane.setRequestFocusEnabled(false);
        jSplitPane1.setTopComponent(scrollPane);

        jLabel1.setText("Output:");

        outputPane.setEditable(false);
        outputPane.setColumns(20);
        outputPane.setRows(5);
        jScrollPane1.setViewportView(outputPane);

        javax.swing.GroupLayout jPanel2Layout = new javax.swing.GroupLayout(jPanel2);
        jPanel2.setLayout(jPanel2Layout);
        jPanel2Layout.setHorizontalGroup(
            jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(jPanel2Layout.createSequentialGroup()
                .addComponent(jLabel1)
                .addGap(0, 0, Short.MAX_VALUE))
            .addComponent(jScrollPane1, javax.swing.GroupLayout.DEFAULT_SIZE, 524, Short.MAX_VALUE)
        );
        jPanel2Layout.setVerticalGroup(
            jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(jPanel2Layout.createSequentialGroup()
                .addComponent(jLabel1)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addComponent(jScrollPane1, javax.swing.GroupLayout.DEFAULT_SIZE, 72, Short.MAX_VALUE))
        );

        jSplitPane1.setRightComponent(jPanel2);

        javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
        jPanel1.setLayout(jPanel1Layout);
        jPanel1Layout.setHorizontalGroup(
            jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addComponent(jSplitPane1)
        );
        jPanel1Layout.setVerticalGroup(
            jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addComponent(jSplitPane1, javax.swing.GroupLayout.DEFAULT_SIZE, 359, Short.MAX_VALUE)
        );

        jMenu1.setText("File");

        jMenuItem1.setAccelerator(javax.swing.KeyStroke.getKeyStroke(java.awt.event.KeyEvent.VK_O, java.awt.event.InputEvent.CTRL_MASK));
        jMenuItem1.setText("Open...");
        jMenuItem1.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jMenuItem1ActionPerformed(evt);
            }
        });
        jMenu1.add(jMenuItem1);

        jMenuItem2.setAccelerator(javax.swing.KeyStroke.getKeyStroke(java.awt.event.KeyEvent.VK_S, java.awt.event.InputEvent.CTRL_MASK));
        jMenuItem2.setText("Save...");
        jMenuItem2.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jMenuItem2ActionPerformed(evt);
            }
        });
        jMenu1.add(jMenuItem2);

        jMenuItem3.setAccelerator(javax.swing.KeyStroke.getKeyStroke(java.awt.event.KeyEvent.VK_S, java.awt.event.InputEvent.SHIFT_MASK | java.awt.event.InputEvent.CTRL_MASK));
        jMenuItem3.setText("Save as...");
        jMenuItem3.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jMenuItem3ActionPerformed(evt);
            }
        });
        jMenu1.add(jMenuItem3);

        jMenuItem8.setText("Export...");
        jMenuItem8.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jMenuItem8ActionPerformed(evt);
            }
        });
        jMenu1.add(jMenuItem8);

        jMenuBar1.add(jMenu1);

        jMenu5.setText("Edit");

        jMenuItem6.setAccelerator(javax.swing.KeyStroke.getKeyStroke(java.awt.event.KeyEvent.VK_W, java.awt.event.InputEvent.CTRL_MASK));
        jMenuItem6.setText("Clear output");
        jMenuItem6.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jMenuItem6ActionPerformed(evt);
            }
        });
        jMenu5.add(jMenuItem6);

        jMenuItem7.setText("Font size...");
        jMenuItem7.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jMenuItem7ActionPerformed(evt);
            }
        });
        jMenu5.add(jMenuItem7);

        jMenuBar1.add(jMenu5);

        jMenu2.setText("Run");
        jMenu2.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jMenu2ActionPerformed(evt);
            }
        });

        jMenuItem5.setAccelerator(javax.swing.KeyStroke.getKeyStroke(java.awt.event.KeyEvent.VK_F5, 0));
        jMenuItem5.setText("Run code");
        jMenuItem5.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jMenuItem5ActionPerformed(evt);
            }
        });
        jMenu2.add(jMenuItem5);

        jMenuBar1.add(jMenu2);

        setJMenuBar(jMenuBar1);

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
        );

        pack();
    }// </editor-fold>//GEN-END:initComponents

    private void jMenuItem1ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jMenuItem1ActionPerformed
        int r = fc.showOpenDialog(this);
        if (r == JFileChooser.APPROVE_OPTION) {
            try {
                File f = fc.getSelectedFile();
                codeBox.setText(readFile(f.toString(), StandardCharsets.UTF_8));
                isSaved = true;
                lastSaved = codeBox.getText();
                setTitle("Editor - " + f.getName());
            } catch (IOException ex) {
                JOptionPane.showInternalMessageDialog(this,
                        "Error:  Cannot load file: " + ex.getMessage());
            }
        }
        codeBox.setCaretPosition(0);
    }//GEN-LAST:event_jMenuItem1ActionPerformed

    public void openFileFromString(String file) {
        try {
            File f = new File(file);
            codeBox.setText(readFile(f.toString(), StandardCharsets.UTF_8));
            isSaved = true;
            lastSaved = codeBox.getText();
            setTitle("Editor - " + f.getName());
        } catch (IOException ex) {
            JOptionPane.showInternalMessageDialog(this,
                    "Error:  Cannot load file: " + ex.getMessage());
        }
    }

    private void jMenuItem2ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jMenuItem2ActionPerformed
        if (!isSaved) {
            int r = fc.showSaveDialog(this);
            if (r == JFileChooser.APPROVE_OPTION) {
                try {
                    saveFile(codeBox.getText(), addSaveExt(fc.getSelectedFile().toString()));
                } catch (IOException ex) {
                    JOptionPane.showInternalMessageDialog(this, "Error:  Cannot save file: " + ex.getMessage());
                }
            }
        } else {
            try {
                saveFile(codeBox.getText(), addSaveExt(fc.getSelectedFile().toString()));
            } catch (IOException ex) {
                JOptionPane.showInternalMessageDialog(this, "Error:  Cannot save file: " + ex.getMessage());
            }
        }
    }//GEN-LAST:event_jMenuItem2ActionPerformed

    private String addSaveExt(String path) {
        if (!path.matches(".*\\.(js|mls|symt)")) {
            path += ".symt";
        }
        return path;
    }
    private void jMenuItem3ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jMenuItem3ActionPerformed
        isSaved = false; // Reset saved status, force dialog
        jMenuItem2ActionPerformed(evt);
    }//GEN-LAST:event_jMenuItem3ActionPerformed

    private void jMenu2ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jMenu2ActionPerformed

    }//GEN-LAST:event_jMenu2ActionPerformed

    private void jMenuItem5ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jMenuItem5ActionPerformed
        CodeRunner cr = new CodeRunner();
        Object result = cr.evalString(codeBox.getText());
        try {
            outputPane.append(result.toString() + "\n");
        } catch (NullPointerException ex) {

        }
    }//GEN-LAST:event_jMenuItem5ActionPerformed

    private void jMenuItem6ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jMenuItem6ActionPerformed
        outputPane.setText("");
    }//GEN-LAST:event_jMenuItem6ActionPerformed

    private void jMenuItem7ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jMenuItem7ActionPerformed
        try {
            int size = Integer.parseInt(JOptionPane.showInternalInputDialog(this,
                    "New font size (8-36):",
                    "Font Size",
                    JOptionPane.QUESTION_MESSAGE));
            if (size >= 8 && size <= 36) {
                codeBox.setFont(new Font(Font.MONOSPACED, Font.PLAIN, size));
                PrefStorage.saveSetting("editor-fontsize", size + "");
            }
        } catch (Exception ex) {

        }
    }//GEN-LAST:event_jMenuItem7ActionPerformed

    private void jMenuItem8ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jMenuItem8ActionPerformed
        CodeExport ce = new CodeExport(codeBox.getText());
        MainGUI.loadFrame(ce);
    }//GEN-LAST:event_jMenuItem8ActionPerformed

    private void saveFile(String content, String path)
            throws IOException {
        try (PrintStream out = new PrintStream(new FileOutputStream(path))) {
            out.print(content);
        }
        setTitle("Editor - " + (new File(path)).getName());
        lastSaved = content;
        isSaved = true;
    }

    @Override
    public void doDefaultCloseAction() {
        if (lastSaved.equals(codeBox.getText())) {
            dispose();
        } else {
            int p = JOptionPane.showInternalConfirmDialog(this,
                    "Are you sure you want to exit without saving this file?",
                    "Unsaved Changes",
                    JOptionPane.YES_NO_OPTION,
                    JOptionPane.QUESTION_MESSAGE);
            if (p == JOptionPane.YES_OPTION) {
                dispose();
            } else {
                jMenuItem3ActionPerformed(null);
            }
        }
    }

    private static String readFile(String path, Charset encoding)
            throws IOException {
        byte[] encoded = Files.readAllBytes(Paths.get(path));
        return new String(encoded, encoding);
    }

    // Variables declaration - do not modify//GEN-BEGIN:variables
    private javax.swing.JLabel jLabel1;
    private javax.swing.JMenu jMenu1;
    private javax.swing.JMenu jMenu2;
    private javax.swing.JMenu jMenu3;
    private javax.swing.JMenu jMenu4;
    private javax.swing.JMenu jMenu5;
    private javax.swing.JMenuBar jMenuBar1;
    private javax.swing.JMenuBar jMenuBar2;
    private javax.swing.JMenuItem jMenuItem1;
    private javax.swing.JMenuItem jMenuItem2;
    private javax.swing.JMenuItem jMenuItem3;
    private javax.swing.JMenuItem jMenuItem4;
    private javax.swing.JMenuItem jMenuItem5;
    private javax.swing.JMenuItem jMenuItem6;
    private javax.swing.JMenuItem jMenuItem7;
    private javax.swing.JMenuItem jMenuItem8;
    private javax.swing.JPanel jPanel1;
    private javax.swing.JPanel jPanel2;
    private javax.swing.JScrollPane jScrollPane1;
    private javax.swing.JSplitPane jSplitPane1;
    private javax.swing.JTextArea outputPane;
    private javax.swing.JScrollPane scrollPane;
    // End of variables declaration//GEN-END:variables
}