package net.agspace;

import net.agspace.translate.Translator;

import javax.swing.*;
import javax.swing.event.DocumentEvent;
import javax.swing.event.DocumentListener;
import javax.swing.filechooser.FileFilter;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.List;
import java.util.ArrayList;

public class Window {

    //List of files that can be imported.
    private static final List<String> OPEN_FILE_EXTENSIONS = new ArrayList<>();

    static {
         OPEN_FILE_EXTENSIONS.add("txt");
    }

    private JPanel mainPanel;
    private JPanel tengwarPanel;
    private JPanel tengwarPanelTop;
    private JLabel tengwarPanelLabel;
    private JTextArea tengwarTextArea;
    private JPanel inputPanel;
    private JPanel inputPanelTop;
    private JLabel inputPanelLabel;
    private JTextArea inputTextArea;
    private JPanel translateButtonPanel;
    private JButton toTengwarButton;
    private JButton toEnglishButton;
    private JButton clearButton;

    private boolean isLive = false;

    Window() {
        //Load the font into the system.
        GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
        try {
            ge.registerFont(Font.createFont(Font.TRUETYPE_FONT, this.getClass().getClassLoader().getResourceAsStream("resources/tngan.ttf")));
        } catch (FontFormatException e) {
            System.err.println("Font format exception!");
        } catch (IOException e) {
            System.err.println("IOException!");
        }

        //Explicit translation from english to tengwar.
        toTengwarButton.addActionListener(e -> tengwarTextArea.setText(Translator.translateToTengwar(inputTextArea.getText())));

        //Clear both text areas.
        clearButton.addActionListener(e -> {
            tengwarTextArea.setText(null);
            inputTextArea.setText(null);
        });

        //Translate tengwar to english.
        toEnglishButton.addActionListener(e -> inputTextArea.setText(Translator.translateToEnglish(tengwarTextArea.getText())));
    }

    private void createUIComponents() {
        mainPanel = new JPanel();
        this.inputTextArea = new JTextArea();
        inputTextArea.getDocument().addDocumentListener(new DocumentListener() {
            @Override
            public void insertUpdate(DocumentEvent e) {
                onEnglishTextChanged();
            }

            @Override
            public void removeUpdate(DocumentEvent e) {
                onEnglishTextChanged();
            }

            @Override
            public void changedUpdate(DocumentEvent e) {
                onEnglishTextChanged();
            }
        });
        this.tengwarTextArea = new JTextArea();
        tengwarTextArea.getDocument().addDocumentListener(new DocumentListener() {
            @Override
            public void insertUpdate(DocumentEvent e) {
                onTengwarTextChanged();
            }

            @Override
            public void removeUpdate(DocumentEvent e) {
                onTengwarTextChanged();
            }

            @Override
            public void changedUpdate(DocumentEvent e) {
                onTengwarTextChanged();
            }
        });
        this.toTengwarButton = new JButton();
        this.toEnglishButton = new JButton();
        this.clearButton = new JButton();
        this.inputTextArea.requestFocus();
    }

    JPanel getMainPanel(){
        return this.mainPanel;
    }

    /**
     * If the english text is changed, and live is selected, then update the tengwar text.
     */
    private void onEnglishTextChanged(){
        if (isLive && inputTextArea.hasFocus())
            tengwarTextArea.setText(Translator.translateToTengwar(inputTextArea.getText()));
    }

    /**
     * If tengwar text is changed, and live is selected, then update the english text.
     */
    private void onTengwarTextChanged(){
        if (isLive && tengwarTextArea.hasFocus())
            inputTextArea.setText(Translator.translateToEnglish(tengwarTextArea.getText()));
    }

    /**
     * Toggle the live button and disable translate buttons if needed.
     * @param e event generated by the check box.
     */
    void onLiveToggled(ActionEvent e){
        if (((JCheckBoxMenuItem) e.getSource()).getState()){
            //Deactivate buttons, set live to true.
            toTengwarButton.setEnabled(false);
            toEnglishButton.setEnabled(false);
            isLive = true;
        } else {
            //Activate buttons, set live to false.
            toTengwarButton.setEnabled(true);
            toEnglishButton.setEnabled(true);
            isLive = false;
        }
    }

    /**
     * What to do if the user clicks the 'import' button.
     */
    void onImportClicked(){
        JFileChooser fileChooser = new JFileChooser(System.getProperty("user.documents"));
        fileChooser.setFileFilter(new FileFilter() {
            @Override
            public boolean accept(File f) {
                if (f.isDirectory())
                    return true;
                String extension = Utils.getExtension(f);
                return extension != null && OPEN_FILE_EXTENSIONS.contains(extension.toLowerCase());
            }

            @Override
            public String getDescription() {
                return "Plain text files.";
            }
        });
        int result = fileChooser.showOpenDialog(this.mainPanel);
        if (result == JFileChooser.APPROVE_OPTION){
            try (BufferedReader br = new BufferedReader(new FileReader(fileChooser.getSelectedFile()))){
                StringBuilder sb = new StringBuilder();
                String line = br.readLine();
                while (line != null){
                    sb.append(line);
                    sb.append(System.lineSeparator());
                    line = br.readLine();
                }
                inputTextArea.setText(sb.toString());
                tengwarTextArea.setText(Translator.translateToTengwar(inputTextArea.getText()));
            } catch (IOException e){
                e.printStackTrace();
            }
        }
    }

    /**
     * What to do when the user wants to save their document.
     */
    void onSaveClicked(){
        JFileChooser fileChooser = new JFileChooser(System.getProperty("user.documents"));
        int result = fileChooser.showSaveDialog(this.mainPanel);
        if (result == JFileChooser.APPROVE_OPTION){
            try (PrintStream ps = new PrintStream(fileChooser.getSelectedFile())){
                ps.println(tengwarTextArea.getText());
            } catch (IOException e){
                e.printStackTrace();
            }
        }
    }

    /**
     * Attempt to open the pdf in the browser.
     */
    void onEnglishModeAboutClicked(){
        if (Desktop.isDesktopSupported()){
            try{
                Desktop.getDesktop().browse(new URI("https://github.com/andrewlalis/TengwarTranslator/blob/master/src/resources/EnglishOneToOneTengwarV2-1.pdf"));
            } catch (URISyntaxException | IOException e){
                e.printStackTrace();
            }
        }
    }

    /**
     * Attempt to open Tengwar wikipedia page.
     */
    void onTengwarAboutClicked(){
        if (Desktop.isDesktopSupported()){
            try{
                Desktop.getDesktop().browse(new URI("https://en.wikipedia.org/wiki/Tengwar"));
            } catch (URISyntaxException | IOException e){
                e.printStackTrace();
            }
        }
    }

    /**
     * Attempt to open my github page.
     */
    void onAboutMeClicked(){
        if (Desktop.isDesktopSupported()){
            try{
                Desktop.getDesktop().browse(new URI("https://github.com/andrewlalis"));
            } catch (URISyntaxException | IOException e){
                e.printStackTrace();
            }
        }
    }
}