package org.openautonomousconnection.webclient.ui;

import org.openautonomousconnection.oacswing.component.OACButton;
import org.openautonomousconnection.oacswing.component.OACFrame;
import org.openautonomousconnection.oacswing.component.OACPanel;
import org.openautonomousconnection.oacswing.component.OACTextField;
import org.openautonomousconnection.oacswing.component.design.DesignManager;

import javax.swing.*;
import java.awt.*;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.Objects;

/**
 * A simple multi-tab browser UI:
 * - Tab headers live in the custom title bar (OACTitleBar / OACTabbedPane).
 * - Tab content (JavaFX WebView) lives in the frame content area.
 * - Address bar controls the currently selected tab.
 */
public class BrowserUI extends OACFrame {

    private static final int TITLE_BAR_HEIGHT = 42;

    private final OACTextField addressField;
    private final OACButton goButton;
    private final OACButton newTabButton;
    private final OACButton closeTabButton;
    private final OACButton backButton;
    private final OACButton forwardButton;
    private final OACButton reloadButton;

    private final CardLayout cardLayout;
    private final OACPanel pageHost;

    private final Map<String, BrowserTab> tabsByKey = new LinkedHashMap<>();
    private int tabCounter = 0;

    /**
     * Creates the browser UI and wires tab selection and address bar to tab content.
     */
    public BrowserUI() {
        super("OAC Browser");

        // Content pane must be offset because your title bar is an overlay in the layered pane.
        JComponent content = (JComponent) getContentPane();
        content.setLayout(new BorderLayout());
        content.setBorder(BorderFactory.createEmptyBorder(TITLE_BAR_HEIGHT, 0, 0, 0));

        // Address bar (top of content area)
        OACPanel navBar = new OACPanel(new BorderLayout(8, 0));
        navBar.setBorder(BorderFactory.createEmptyBorder(8, 10, 8, 10));

        OACPanel leftControls = new OACPanel(new FlowLayout(FlowLayout.LEFT, 6, 0));
        backButton = new OACButton("←");
        forwardButton = new OACButton("→");
        reloadButton = new OACButton("⟳");
        leftControls.add(backButton);
        leftControls.add(forwardButton);
        leftControls.add(reloadButton);

        addressField = new OACTextField();
        goButton = new OACButton("Go");

        OACPanel rightControls = new OACPanel(new FlowLayout(FlowLayout.RIGHT, 6, 0));
        newTabButton = new OACButton("+");
        closeTabButton = new OACButton("✕");
        rightControls.add(newTabButton);
        rightControls.add(closeTabButton);

        navBar.add(leftControls, BorderLayout.WEST);
        navBar.add(addressField, BorderLayout.CENTER);
        navBar.add(goButton, BorderLayout.EAST);
        navBar.add(rightControls, BorderLayout.EAST);

        // Fix: BorderLayout only allows one EAST; wrap Go+RightControls in a single panel
        OACPanel east = new OACPanel(new FlowLayout(FlowLayout.RIGHT, 6, 0));

        east.add(goButton);
        east.add(newTabButton);
        east.add(closeTabButton);
        navBar.add(east, BorderLayout.EAST);

        content.add(navBar, BorderLayout.NORTH);

        // Page host
        cardLayout = new CardLayout();
        pageHost = new OACPanel(cardLayout);
        content.add(pageHost, BorderLayout.CENTER);

        // Wire title bar tab selection to content host
        getTitleBar().getTabs().addChangeListener(e -> onHeaderTabChanged());

        // Wire address bar actions
        addressField.addActionListener(e -> navigateCurrent(addressField.getText()));
        goButton.addActionListener(e -> navigateCurrent(addressField.getText()));

        // Wire navigation buttons
        backButton.addActionListener(e -> {
            BrowserTab tab = getCurrentTab();
            if (tab != null) tab.goBack();
        });
        forwardButton.addActionListener(e -> {
            BrowserTab tab = getCurrentTab();
            if (tab != null) tab.goForward();
        });
        reloadButton.addActionListener(e -> {
            BrowserTab tab = getCurrentTab();
            if (tab != null) tab.reload();
        });

        newTabButton.addActionListener(e -> openNewTab("web://info.oac/"));
        closeTabButton.addActionListener(e -> closeCurrentTab());

        // Create first tab
        DesignManager.apply(this);
    }

    /**
     * Opens a new tab and navigates to the given URL.
     *
     * @param url initial URL
     */
    public void openNewTab(String url) {
        String key = nextTabKey();
        BrowserTab tab = new BrowserTab(url, newLocation -> SwingUtilities.invokeLater(() -> {
            BrowserTab current = getCurrentTab();
            if (current != null && Objects.equals(current.getKey(), key)) {
                addressField.setText(newLocation);
            }
        }));

        tabsByKey.put(key, tab);

        // Real page content in center host
        pageHost.add(tab.getView(), key);

        // Header tab in title bar: DO NOT place the real page here (title bar is only ~42px high).
        getTitleBar().addTab(key, new OACPanel());

        // Select it
        int idx = getTitleBar().getTabs().getTabCount() - 1;
        getTitleBar().getTabs().setSelectedIndex(idx);

        // Navigate
        tab.loadUrl(url);

        // Show content
        cardLayout.show(pageHost, key);
        pageHost.revalidate();
        pageHost.repaint();

        // Update address field immediately
        addressField.setText(url);
    }

    /**
     * Navigates the current tab to the given input (URL or host).
     *
     * @param input user input
     */
    public void navigateCurrent(String input) {
        BrowserTab tab = getCurrentTab();
        if (tab == null) return;

        String url = normalizeUrl(input);
        addressField.setText(url);
        tab.loadUrl(url);
    }

    /**
     * Closes the currently selected tab.
     */
    public void closeCurrentTab() {
        int idx = getTitleBar().getTabs().getSelectedIndex();
        if (idx < 0) return;

        String key = getTitleBar().getTabs().getTitleAt(idx);

        BrowserTab removed = tabsByKey.remove(key);
        if (removed != null) {
            removed.dispose();
            pageHost.remove(removed.getView());
        }

        getTitleBar().getTabs().removeTabAt(idx);

        // If no tabs left, open a new one
        if (getTitleBar().getTabs().getTabCount() == 0) {
            openNewTab("web://info.oac/");
            return;
        }

        // Show selected tab content
        onHeaderTabChanged();
    }

    private void onHeaderTabChanged() {
        BrowserTab tab = getCurrentTab();
        if (tab == null) return;

        cardLayout.show(pageHost, tab.getKey());
        pageHost.revalidate();
        pageHost.repaint();

        // Sync address bar
        String loc = tab.getLocation();
        if (loc != null && !loc.isBlank()) {
            addressField.setText(loc);
        }
    }

    public BrowserTab getCurrentTab() {
        int idx = getTitleBar().getTabs().getSelectedIndex();
        if (idx < 0) return null;

        String key = getTitleBar().getTabs().getTitleAt(idx);
        return tabsByKey.get(key);
    }

    private String nextTabKey() {
        tabCounter++;
        return "Tab " + tabCounter;
    }

    private static String normalizeUrl(String input) {
        String s = input == null ? "" : input.trim();
        if (s.isEmpty()) return "web://info.oac/";
        if (s.startsWith("web://")) {
            // Ensure trailing slash for "host only" URLs
            String rest = s.substring("web://".length());
            if (!rest.contains("/")) return s + "/";
            return s;
        }
        return "web://" + s + (s.contains("/") ? "" : "/");
    }
}