/**************************************************************************/
/*  FullScreenGodotApp.java                                               */
/**************************************************************************/
/*                         This file is part of:                          */
/*                             GODOT ENGINE                               */
/*                        https://godotengine.org                         */
/**************************************************************************/
/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur.                  */
/*                                                                        */
/* Permission is hereby granted, free of charge, to any person obtaining  */
/* a copy of this software and associated documentation files (the        */
/* "Software"), to deal in the Software without restriction, including    */
/* without limitation the rights to use, copy, modify, merge, publish,    */
/* distribute, sublicense, and/or sell copies of the Software, and to     */
/* permit persons to whom the Software is furnished to do so, subject to  */
/* the following conditions:                                              */
/*                                                                        */
/* The above copyright notice and this permission notice shall be         */
/* included in all copies or substantial portions of the Software.        */
/*                                                                        */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,        */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF     */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. */
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY   */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,   */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE      */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                 */
/**************************************************************************/

package org.godotengine.godot;

import org.godotengine.godot.utils.ProcessPhoenix;

import android.content.Intent;
import android.os.Bundle;
import android.util.Log;

import androidx.annotation.CallSuper;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.fragment.app.Fragment;
import androidx.fragment.app.FragmentActivity;

/**
 * Base activity for Android apps intending to use Godot as the primary and only screen.
 *
 * It's also a reference implementation for how to setup and use the {@link Godot} fragment
 * within an Android app.
 */
public abstract class FullScreenGodotApp extends FragmentActivity implements GodotHost {
	private static final String TAG = FullScreenGodotApp.class.getSimpleName();

	protected static final String EXTRA_FORCE_QUIT = "force_quit_requested";
	protected static final String EXTRA_NEW_LAUNCH = "new_launch_requested";

	@Nullable
	private Godot godotFragment;

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.godot_app_layout);

		handleStartIntent(getIntent(), true);

		Fragment currentFragment = getSupportFragmentManager().findFragmentById(R.id.godot_fragment_container);
		if (currentFragment instanceof Godot) {
			Log.v(TAG, "Reusing existing Godot fragment instance.");
			godotFragment = (Godot)currentFragment;
		} else {
			Log.v(TAG, "Creating new Godot fragment instance.");
			godotFragment = initGodotInstance();
			getSupportFragmentManager().beginTransaction().replace(R.id.godot_fragment_container, godotFragment).setPrimaryNavigationFragment(godotFragment).commitNowAllowingStateLoss();
		}
	}

	@Override
	public void onDestroy() {
		Log.v(TAG, "Destroying Godot app...");
		super.onDestroy();
		terminateGodotInstance(godotFragment);
	}

	@Override
	public final void onGodotForceQuit(Godot instance) {
		runOnUiThread(() -> {
			terminateGodotInstance(instance);
		});
	}

	private void terminateGodotInstance(Godot instance) {
		if (instance == godotFragment) {
			Log.v(TAG, "Force quitting Godot instance");
			ProcessPhoenix.forceQuit(FullScreenGodotApp.this);
		}
	}

	@Override
	public final void onGodotRestartRequested(Godot instance) {
		runOnUiThread(() -> {
			if (instance == godotFragment) {
				// It's very hard to properly de-initialize Godot on Android to restart the game
				// from scratch. Therefore, we need to kill the whole app process and relaunch it.
				//
				// Restarting only the activity, wouldn't be enough unless it did proper cleanup (including
				// releasing and reloading native libs or resetting their state somehow and clearing statics).
				Log.v(TAG, "Restarting Godot instance...");
				ProcessPhoenix.triggerRebirth(FullScreenGodotApp.this);
			}
		});
	}

	@Override
	public void onNewIntent(Intent intent) {
		super.onNewIntent(intent);
		setIntent(intent);

		handleStartIntent(intent, false);

		if (godotFragment != null) {
			godotFragment.onNewIntent(intent);
		}
	}

	private void handleStartIntent(Intent intent, boolean newLaunch) {
		boolean forceQuitRequested = intent.getBooleanExtra(EXTRA_FORCE_QUIT, false);
		if (forceQuitRequested) {
			Log.d(TAG, "Force quit requested, terminating..");
			ProcessPhoenix.forceQuit(this);
			return;
		}

		if (!newLaunch) {
			boolean newLaunchRequested = intent.getBooleanExtra(EXTRA_NEW_LAUNCH, false);
			if (newLaunchRequested) {
				Log.d(TAG, "New launch requested, restarting..");

				Intent restartIntent = new Intent(intent).putExtra(EXTRA_NEW_LAUNCH, false);
				ProcessPhoenix.triggerRebirth(this, restartIntent);
				return;
			}
		}
	}

	@CallSuper
	@Override
	public void onActivityResult(int requestCode, int resultCode, Intent data) {
		super.onActivityResult(requestCode, resultCode, data);
		if (godotFragment != null) {
			godotFragment.onActivityResult(requestCode, resultCode, data);
		}
	}

	@CallSuper
	@Override
	public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
		super.onRequestPermissionsResult(requestCode, permissions, grantResults);
		if (godotFragment != null) {
			godotFragment.onRequestPermissionsResult(requestCode, permissions, grantResults);
		}
	}

	@Override
	public void onBackPressed() {
		if (godotFragment != null) {
			godotFragment.onBackPressed();
		} else {
			super.onBackPressed();
		}
	}

	/**
	 * Used to initialize the Godot fragment instance in {@link FullScreenGodotApp#onCreate(Bundle)}.
	 */
	@NonNull
	protected Godot initGodotInstance() {
		return new Godot();
	}

	@Nullable
	protected final Godot getGodotFragment() {
		return godotFragment;
	}
}
