package org.openautonomousconnection.webclient.ui;

import java.util.Objects;
import java.util.function.Consumer;

/**
 * A logical browser tab consisting of a key (tab id), a TabView (WebView),
 * and navigation helpers.
 */
public class BrowserTab {

    private final String key;
    private final TabView view;

    /**
     * Creates a browser tab.
     *
     * @param initialUrl       initial URL (used for initial location value)
     * @param onLocationChange callback invoked on URL changes
     */
    public BrowserTab(String initialUrl, Consumer<String> onLocationChange) {
        this.key = Objects.requireNonNull(initialUrl, "initialUrl"); // placeholder key overwritten by BrowserUI
        this.view = new TabView(onLocationChange, initialUrl);
    }

    /**
     * Sets the key (tab id) used by the UI host.
     *
     * @param key tab key
     * @return this
     */
    public BrowserTab withKey(String key) {
        // The BrowserUI uses titles as keys; keep logic simple.
        return new BrowserTabKeyed(key, view);
    }

    /**
     * Loads a URL.
     *
     * @param url URL
     */
    public void loadUrl(String url) {
        view.loadUrl(url);
    }

    /**
     * Goes back in history if possible.
     */
    public void goBack() {
        view.back();
    }

    /**
     * Goes forward in history if possible.
     */
    public void goForward() {
        view.forward();
    }

    /**
     * Reloads the page.
     */
    public void reload() {
        view.reload();
    }

    /**
     * Returns current location if known.
     *
     * @return URL or null
     */
    public String getLocation() {
        return view.getEngineLocation();
    }

    /**
     * Releases resources.
     */
    public void dispose() {
        view.dispose();
    }

    /**
     * Returns the tab key.
     *
     * @return key
     */
    public String getKey() {
        return key;
    }

    /**
     * Returns the Swing component that renders the web content.
     *
     * @return tab view
     */
    public TabView getView() {
        return view;
    }

    /**
     * Internal keyed wrapper so BrowserUI can store a stable key without re-creating the WebView.
     */
    private static final class BrowserTabKeyed extends BrowserTab {

        private final String fixedKey;
        private final TabView fixedView;

        private BrowserTabKeyed(String fixedKey, TabView fixedView) {
            super("about:blank", s -> {
            });
            this.fixedKey = Objects.requireNonNull(fixedKey, "fixedKey");
            this.fixedView = Objects.requireNonNull(fixedView, "fixedView");
        }

        @Override
        public String getKey() {
            return fixedKey;
        }

        @Override
        public TabView getView() {
            return fixedView;
        }

        @Override
        public void loadUrl(String url) {
            fixedView.loadUrl(url);
        }

        @Override
        public void goBack() {
            fixedView.back();
        }

        @Override
        public void goForward() {
            fixedView.forward();
        }

        @Override
        public void reload() {
            fixedView.reload();
        }

        @Override
        public String getLocation() {
            return fixedView.getEngineLocation();
        }

        @Override
        public void dispose() {
            fixedView.dispose();
        }
    }
}