package app;

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

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

// CPU window
class CPUWindow extends ChildWindow {

    // Instance fields
    private int     expandWidth;  // Width of expand buttons
    private boolean shown;        // Window has been shown
    private int     systemHeight; // Initial height of system register list

    // UI components
    private JPanel       dasm;       // Disassembler
    private RegisterList lstProgram; // Program register list
    private RegisterList lstSystem;  // System register list



    ///////////////////////////////////////////////////////////////////////////
    //                            Global Settings                            //
    ///////////////////////////////////////////////////////////////////////////

    static int       regExpandWidth; // Width of register list expand button
    static Font      regHexFont;     // Register list hex font
    static Dimension regHexFontSize; // Max dimensions
    static HashSet<CPUWindow> instances; // Spawned instances

    // Static initializer
    static {
        setDefaults();
        instances = new HashSet<CPUWindow>();
    }



    ///////////////////////////////////////////////////////////////////////////
    //                            Static Methods                             //
    ///////////////////////////////////////////////////////////////////////////

    // Apply configuration settings to all instances
    static void configureAll() {
        for (var inst : instances)
            inst.configure();
    }

    // Reset all settings to their default values
    static void setDefaults() {

        // Register list hex font
        setRegHexFont(new Font(Util.fontFamily(new String[]
            { "Consolas", Font.MONOSPACED } ), Font.PLAIN, 14));

        // Width of register list expand button
        var label = new JLabel("+");
        regExpandWidth = label.getPreferredSize().width;
        label.setText("-");
        regExpandWidth = Math.max(regExpandWidth,
            label.getPreferredSize().width);
    }

    // Specify a font to use as the register list hex font
    static void setRegHexFont(Font font) {
        regHexFont     = font;
        regHexFontSize = measureHex(font);
    }



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

    // Default constructor
    CPUWindow(MainWindow parent) {
        super(parent, "cpu.title");
        instances.add(this);

        var client = getContentPane();

        dasm = new JPanel(null);
        dasm.setBackground(SystemColor.window);
        dasm.setFocusable(true);

        lstSystem = new RegisterList(this, true);
        lstProgram = new RegisterList(this, false);
        var inner = Util.splitPane(JSplitPane.VERTICAL_SPLIT);
        inner.setTopComponent(lstSystem);
        inner.setBottomComponent(lstProgram);

        var outer = Util.splitPane(JSplitPane.HORIZONTAL_SPLIT);
        outer.setLeftComponent(new JScrollPane(dasm,
            JScrollPane.VERTICAL_SCROLLBAR_NEVER,
            JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED));
        outer.setRightComponent(inner);
        outer.setResizeWeight(1);

        client.add(outer);
        client.setPreferredSize(new Dimension(480, 300));
        configure();
        pack();
    }


    ///////////////////////////////////////////////////////////////////////////
    //                            Public Methods                             //
    ///////////////////////////////////////////////////////////////////////////

    // The window is closing
    public void dispose() {
        instances.remove(this);
        super.dispose();
    }



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

    // Apply configuration settings
    void configure() {
        lstProgram.configure();
        lstSystem .configure();
    }

    // Update the display
    void refresh() {
        lstSystem.refresh();
        lstProgram.refresh();
    }



    ///////////////////////////////////////////////////////////////////////////
    //                            Event Handlers                             //
    ///////////////////////////////////////////////////////////////////////////

    // Client resize
    private void onResize() {
        //refreshDasm();
    }



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

    // Determine the maximum character width of a hex character in a font
    private static Dimension measureHex(Font font) {
        int       ret  = 0;
        Dimension size = null;

        // Process all digits
        var label = new JLabel();
        label.setFont(font);
        for (int x = 0; x < 16; x++) {
            label.setText(String.format(
                "%" + (Disassembler.hexCaps ? "X" : "x"
            ), x));
            size = label.getPreferredSize();
            ret  = Math.max(ret, size.width);
        }

        return new Dimension(ret, size.height);
    }



}