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// Copyright (C) 2024 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only

package org.qtproject.qt.android;

import static org.qtproject.qt.android.QtNative.ApplicationState.*;

import android.app.Activity;
import android.app.Application;
import android.content.Context;
import android.content.res.Resources;
import android.os.Build;
import android.os.Bundle;
import android.os.Handler;
import android.os.Looper;
import android.util.DisplayMetrics;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup;

import java.util.ArrayList;
import java.util.HashMap;

class QtEmbeddedDelegate extends QtActivityDelegateBase
        implements QtNative.AppStateDetailsListener, QtEmbeddedViewInterface
{
    // TODO simplistic implementation with one QtView, expand to support multiple views QTBUG-117649
    private QtView m_view;
    private QtNative.ApplicationStateDetails m_stateDetails;
    private boolean m_windowLoaded = false;

    public QtEmbeddedDelegate(Activity context) {
        super(context);

        m_stateDetails = QtNative.getStateDetails();
        QtNative.registerAppStateListener(this);

        m_activity.getApplication().registerActivityLifecycleCallbacks(
        new Application.ActivityLifecycleCallbacks() {
            @Override
            public void onActivityCreated(Activity activity, Bundle savedInstanceState) {}

            @Override
            public void onActivityStarted(Activity activity) {}

            @Override
            public void onActivityResumed(Activity activity) {
                if (m_activity == activity && m_stateDetails.isStarted) {
                    QtNative.setApplicationState(ApplicationActive);
                    QtNative.updateWindow();
                }
            }

            @Override
            public void onActivityPaused(Activity activity) {
                if (m_activity == activity && m_stateDetails.isStarted) {
                    if (Build.VERSION.SDK_INT < Build.VERSION_CODES.N ||
                        !activity.isInMultiWindowMode()) {
                        QtNative.setApplicationState(ApplicationInactive);
                    }
                }
            }

            @Override
            public void onActivityStopped(Activity activity) {
                if (m_activity == activity && m_stateDetails.isStarted) {
                    QtNative.setApplicationState(ApplicationSuspended);
                }
            }

            @Override
            public void onActivitySaveInstanceState(Activity activity, Bundle outState) {}

            @Override
            public void onActivityDestroyed(Activity activity) {
                if (m_activity == activity && m_stateDetails.isStarted) {
                    m_activity.getApplication().unregisterActivityLifecycleCallbacks(this);
                    QtNative.unregisterAppStateListener(QtEmbeddedDelegate.this);
                    QtEmbeddedDelegateFactory.remove(m_activity);
                    QtNative.terminateQt();
                    QtNative.setActivity(null);
                    QtNative.getQtThread().exit();
                }
            }
        });
    }

    @Override
    public void onAppStateDetailsChanged(QtNative.ApplicationStateDetails details) {
        synchronized (this) {
            m_stateDetails = details;
        }
    }

    @Override
    public void onNativePluginIntegrationReadyChanged(boolean ready)
    {
        synchronized (this) {
            if (ready) {
                QtNative.runAction(() -> {
                    DisplayMetrics metrics = Resources.getSystem().getDisplayMetrics();
                    QtDisplayManager.setApplicationDisplayMetrics(m_activity, metrics.widthPixels,
                                                                  metrics.heightPixels);

                });
                createRootWindow();
            }
        }
    }

    @Override
    void startNativeApplicationImpl(String appParams, String mainLib)
    {
        QtNative.startApplication(appParams, mainLib);
    }

    @Override
    QtAccessibilityDelegate createAccessibilityDelegate()
    {
        // FIXME make QtAccessibilityDelegate window based or verify current way works
        // also for child windows: QTBUG-120685
        return null;
    }

    @UsedFromNativeCode
    @Override
    QtLayout getQtLayout()
    {
        // TODO verify if returning m_view here works, this is used by the androidjniinput
        // when e.g. showing a keyboard, so depends on getting the keyboard focus working
        // QTBUG-118873
        if (m_view == null)
            return null;
        return m_view.getQtWindow();
    }

    // QtEmbeddedViewInterface implementation begin
    @Override
    public void startQtApplication(String appParams, String mainLib)
    {
        super.startNativeApplication(appParams, mainLib);
    }

    @Override
    public void queueLoadWindow()
    {
        synchronized (this) {
            if (m_stateDetails.nativePluginIntegrationReady)
                createRootWindow();
        }
    }

    @Override
    public void setView(QtView view)
    {
        m_view = view;
        updateInputDelegate();
        if (m_view != null)
            registerGlobalFocusChangeListener(m_view);
    }
    // QtEmbeddedViewInterface implementation end

    private void updateInputDelegate() {
        if (m_view == null) {
            m_inputDelegate.setEditPopupMenu(null);
            return;
        }
        m_inputDelegate.setEditPopupMenu(new EditPopupMenu(m_activity, m_view));
    }

    private void createRootWindow() {
        if (m_view != null && !m_windowLoaded) {
            QtView.createRootWindow(m_view, m_view.getLeft(), m_view.getTop(), m_view.getWidth(),
                                    m_view.getHeight());
            m_windowLoaded = true;
        }
    }
}