package app;

// Java imports
import java.awt.*;
import java.util.*;
import javax.swing.*;

// Project imports
import util.*;
import vue.*;

// Top-level software state manager
public class App {

    // Instance fields
    private boolean useNative; // Produce native core contexts
    private Localizer.Locale[]    locales; // Language translations
    private ArrayList<MainWindow> windows; // Application windows

    // Configuration fields
    Util.Font fntDialog;     // Dialog font
    Util.Font fntMono;       // Monospaced font
    int       hexDigitWidth; // Width in pixels of one hex digit
    Localizer localizer;     // UI localization manager
    int[][]   rgbBase;       // Base anaglyph filter colors
    int       rgbClear;      // Transparent pixel color



    ///////////////////////////////////////////////////////////////////////////
    //                               Constants                               //
    ///////////////////////////////////////////////////////////////////////////

    // Anaglyph presets
    static final int[] RED     = { 0xFF, 0x00, 0x00 };
    static final int[] CYAN    = { 0x00, 0xC6, 0xF0 };
    static final int[] GREEN   = { 0x00, 0xB4, 0x00 };
    static final int[] MAGENTA = { 0xC8, 0x00, 0xFF };



    ///////////////////////////////////////////////////////////////////////////
    //                             Constructors                              //
    ///////////////////////////////////////////////////////////////////////////

    // Default constructor
    public App(boolean useNative) {

        // Configure instance fields
        localizer = new Localizer();
        windows   = new ArrayList<MainWindow>();

        // Configure config fields
        fntDialog     = new Util.Font(new JLabel().getFont());
        fntMono       = new Util.Font(new Font(Util.fontFamily(new String[]
            { "Consolas", Font.MONOSPACED } ), Font.PLAIN, 14));
        hexDigitWidth = hexDigitWidth();
        rgbBase       = new int[][] { GREEN, MAGENTA, RED };
        rgbClear      = 0x003050;

        // Additional processing
        setUseNative(useNative);
        initLocales();
        addWindow();
    }



    ///////////////////////////////////////////////////////////////////////////
    //                            Package Methods                            //
    ///////////////////////////////////////////////////////////////////////////

    // Add a new program window
    void addWindow() {
        windows.add(new MainWindow(this));
        windowsChanged();
    }

    // Determine whether the native module is in use
    boolean getUseNative() {
        return useNative;
    }

    // Retrieve a list of registered locales
    Localizer.Locale[] listLocales() {
        var ret = new Localizer.Locale[locales.length];
        System.arraycopy(locales, 0, ret, 0, locales.length);
        return ret;
    }

    // Determine the number of a window in the collection
    int numberOf(MainWindow window) {
        return windows.indexOf(window) + 1;
    }

    // Remove a program window
    void removeWindow(MainWindow window) {
        windows.remove(window);
        windowsChanged();
    }

    // Specify whether using the native module
    boolean setUseNative(boolean useNative) {
        return this.useNative = useNative && Vue.getNativeID() != null;
    }



    ///////////////////////////////////////////////////////////////////////////
    //                            Private Methods                            //
    ///////////////////////////////////////////////////////////////////////////

    // Calculate the maximum hexadecimal digit width
    private int hexDigitWidth() {
        int width   = 0;
        for (var digit : "0123456789ABCDEFabcdef".toCharArray())
            width = Math.max(width, fntMono.metrics.charWidth(digit));
        return width;
    }

    // Load and parse all locale translations
    private void initLocales() {

        // Process all locale files
        var locales = new HashMap<String, Localizer.Locale>();
        for (String file : Util.listFiles("locale")) {

            // Process the file
            try {
                var locale = Localizer.parse(Util.textRead("locale/" + file));
                String key = locale.id.toLowerCase();

                // Register the locale
                if (locales.containsKey(key)) throw new RuntimeException(
                    "Locale with ID '" + locale.id + "' already registered");
                locales.put(key, locale);

                // The locale matches the one in the config
                if (key.equals("en-us"))
                    localizer.setLocale(locale);
            }

            // Could not process the file
            catch (Exception e) {
                System.err.println("Error parsing locale " +
                    file + ": " + e.getMessage());
            }

        }

        // Produce the list of registered locales
        this.locales = locales.values().toArray(
            new Localizer.Locale[locales.size()]);
        Arrays.sort(this.locales);

        // Select a default locale
        if (localizer.getLocale() != null || this.locales.length == 0)
            return;
        var locale = locales.get("en-us");
        localizer.setLocale(locale != null ? locale : this.locales[0]);
    }

    // A window has been added to or removed from the program state
    private void windowsChanged() {
        int count = windows.size();
        for (int x = 0; x < count; x++)
            windows.get(x).windowsChanged(x + 1, count == 1);
    }

}