/*
    Copyright (C) 2021 The Qt Company Ltd.
    Copyright (c) 2019, BogDan Vatra <bogdan@kde.org>
    Contact: http://www.qt.io/licensing/

    Commercial License Usage
    Licensees holding valid commercial Qt licenses may use this file in
    accordance with the commercial license agreement provided with the
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    and conditions see http://www.qt.io/terms-conditions. For further
    information use the contact form at http://www.qt.io/contact-us.

    BSD License Usage
    Alternatively, this file may be used under the BSD license as follows:
    Redistribution and use in source and binary forms, with or without
    modification, are permitted provided that the following conditions
    are met:

    1. Redistributions of source code must retain the above copyright
    notice, this list of conditions and the following disclaimer.
    2. Redistributions in binary form must reproduce the above copyright
    notice, this list of conditions and the following disclaimer in the
    documentation and/or other materials provided with the distribution.

    THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
    IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
    OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
    IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
    INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
    NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
    DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
    THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
    (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
    THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

package org.qtproject.qt.android.bindings;

import android.app.AlertDialog;
import android.content.Context;
import android.content.ContextWrapper;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.pm.ComponentInfo;
import android.content.res.Resources;
import android.os.Build;
import android.os.Bundle;
import android.util.Log;

import java.io.File;
import java.io.FileOutputStream;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;

import dalvik.system.DexClassLoader;

public abstract class QtLoader {

    public static final String ERROR_CODE_KEY = "error.code";
    public static final String ERROR_MESSAGE_KEY = "error.message";
    public static final String DEX_PATH_KEY = "dex.path";
    public static final String LIB_PATH_KEY = "lib.path";
    public static final String LOADER_CLASS_NAME_KEY = "loader.class.name";
    public static final String NATIVE_LIBRARIES_KEY = "native.libraries";
    public static final String ENVIRONMENT_VARIABLES_KEY = "environment.variables";
    public static final String APPLICATION_PARAMETERS_KEY = "application.parameters";
    public static final String BUNDLED_LIBRARIES_KEY = "bundled.libraries";
    public static final String MAIN_LIBRARY_KEY = "main.library";
    public static final String STATIC_INIT_CLASSES_KEY = "static.init.classes";
    public static final String EXTRACT_STYLE_KEY = "extract.android.style";
    private static final String EXTRACT_STYLE_MINIMAL_KEY = "extract.android.style.option";

    // These parameters matter in case of deploying application as system (embedded into firmware)
    public static final String SYSTEM_LIB_PATH = "/system/lib/";
    public String[] SYSTEM_APP_PATHS = {"/system/priv-app/", "/system/app/"};

    public String APPLICATION_PARAMETERS = null; // use this variable to pass any parameters to your application,
    // the parameters must not contain any white spaces
    // and must be separated with "\t"
    // e.g "-param1\t-param2=value2\t-param3\tvalue3"

    public String ENVIRONMENT_VARIABLES = "QT_USE_ANDROID_NATIVE_DIALOGS=1";
    // use this variable to add any environment variables to your application.
    // the env vars must be separated with "\t"
    // e.g. "ENV_VAR1=1\tENV_VAR2=2\t"
    // Currently the following vars are used by the android plugin:
    // * QT_USE_ANDROID_NATIVE_DIALOGS -1 to use the android native dialogs.

    public String[] QT_ANDROID_THEMES = null;     // A list with all themes that your application want to use.
    // The name of the theme must be the same with any theme from
    // http://developer.android.com/reference/android/R.style.html
    // The most used themes are:
    //  * "Theme" - (fallback) check http://developer.android.com/reference/android/R.style.html#Theme
    //  * "Theme_Black" - check http://developer.android.com/reference/android/R.style.html#Theme_Black
    //  * "Theme_Light" - (default for API <=10) check http://developer.android.com/reference/android/R.style.html#Theme_Light
    //  * "Theme_Holo" - check http://developer.android.com/reference/android/R.style.html#Theme_Holo
    //  * "Theme_Holo_Light" - (default for API 11-13) check http://developer.android.com/reference/android/R.style.html#Theme_Holo_Light
    //  * "Theme_DeviceDefault" - check http://developer.android.com/reference/android/R.style.html#Theme_DeviceDefault
    //  * "Theme_DeviceDefault_Light" - (default for API 14+) check http://developer.android.com/reference/android/R.style.html#Theme_DeviceDefault_Light

    public String QT_ANDROID_DEFAULT_THEME = null; // sets the default theme.

    public ArrayList<String> m_qtLibs = null; // required qt libs
    public int m_displayDensity = -1;
    private ContextWrapper m_context;
    protected ComponentInfo m_contextInfo;
    private Class<?> m_delegateClass;

    private static ArrayList<FileOutputStream> m_fileOutputStreams = new ArrayList<FileOutputStream>();
    // List of open file streams associated with files copied during installation.

    QtLoader(ContextWrapper context, Class<?> clazz) {
        m_context = context;
        m_delegateClass = clazz;
    }

    // Implement in subclass
    protected void finish() {}

    protected String getTitle() {
        return "Qt";
    }

    protected void runOnUiThread(Runnable run) {
        run.run();
    }

    protected abstract String loaderClassName();
    protected abstract Class<?> contextClassName();

    Intent getIntent()
    {
        return null;
    }
    // Implement in subclass

    private final List<String> supportedAbis = Arrays.asList(Build.SUPPORTED_ABIS);
    private String preferredAbi = null;

    private ArrayList<String> prefferedAbiLibs(String []libs)
    {
        HashMap<String, ArrayList<String>> abisLibs = new HashMap<>();
        for (String lib : libs) {
            String[] archLib = lib.split(";", 2);
            if (preferredAbi != null && !archLib[0].equals(preferredAbi))
                continue;
            if (!abisLibs.containsKey(archLib[0]))
                abisLibs.put(archLib[0], new ArrayList<String>());
            abisLibs.get(archLib[0]).add(archLib[1]);
        }

        if (preferredAbi != null) {
            if (abisLibs.containsKey(preferredAbi)) {
                return abisLibs.get(preferredAbi);
            }
            return new ArrayList<String>();
        }

        for (String abi: supportedAbis) {
            if (abisLibs.containsKey(abi)) {
                preferredAbi = abi;
                return abisLibs.get(abi);
            }
        }
        return new ArrayList<String>();
    }

    // this function is used to load and start the loader
    private void loadApplication(Bundle loaderParams)
    {
        final Resources resources = m_context.getResources();
        final String packageName = m_context.getPackageName();
        try {
            final int errorCode = loaderParams.getInt(ERROR_CODE_KEY);
            if (errorCode != 0) {
                // fatal error, show the error and quit
                AlertDialog errorDialog = new AlertDialog.Builder(m_context).create();
                errorDialog.setMessage(loaderParams.getString(ERROR_MESSAGE_KEY));
                errorDialog.setButton(resources.getString(android.R.string.ok),
                        new DialogInterface.OnClickListener() {
                            @Override
                            public void onClick(DialogInterface dialog, int which) {
                                finish();
                            }
                        });
                errorDialog.show();
                return;
            }

            // add all bundled Qt libs to loader params
            int id = resources.getIdentifier("bundled_libs", "array", packageName);
            final String[] bundledLibs = resources.getStringArray(id);
            ArrayList<String> libs = new ArrayList<>(prefferedAbiLibs(bundledLibs));

            String libName = null;
            if (m_contextInfo.metaData.containsKey("android.app.lib_name")) {
                libName = m_contextInfo.metaData.getString("android.app.lib_name") + "_" + preferredAbi;
                loaderParams.putString(MAIN_LIBRARY_KEY, libName); //main library contains main() function
            }

            loaderParams.putStringArrayList(BUNDLED_LIBRARIES_KEY, libs);

            // load and start QtLoader class
            DexClassLoader classLoader = new DexClassLoader(loaderParams.getString(DEX_PATH_KEY), // .jar/.apk files
                    m_context.getDir("outdex", Context.MODE_PRIVATE).getAbsolutePath(), // directory where optimized DEX files should be written.
                    loaderParams.containsKey(LIB_PATH_KEY) ? loaderParams.getString(LIB_PATH_KEY) : null, // libs folder (if exists)
                    m_context.getClassLoader()); // parent loader

            Class<?> loaderClass = classLoader.loadClass(loaderParams.getString(LOADER_CLASS_NAME_KEY)); // load QtLoader class
            Object qtLoader = loaderClass.newInstance(); // create an instance
            Method prepareAppMethod = qtLoader.getClass().getMethod("loadApplication",
                    contextClassName(),
                    ClassLoader.class,
                    Bundle.class);
            if (!(Boolean)prepareAppMethod.invoke(qtLoader, m_context, classLoader, loaderParams))
                throw new Exception("");

            QtApplication.setQtContextDelegate(m_delegateClass, qtLoader);

            Method startAppMethod=qtLoader.getClass().getMethod("startApplication");
            if (!(Boolean)startAppMethod.invoke(qtLoader))
                throw new Exception("");

        } catch (Exception e) {
            e.printStackTrace();
            AlertDialog errorDialog = new AlertDialog.Builder(m_context).create();
            int id = resources.getIdentifier("fatal_error_msg", "string",
                    packageName);
            errorDialog.setMessage(resources.getString(id));
            errorDialog.setButton(resources.getString(android.R.string.ok),
                    new DialogInterface.OnClickListener() {
                        @Override
                        public void onClick(DialogInterface dialog, int which) {
                            finish();
                        }
                    });
            errorDialog.show();
        }
    }

    public void startApp(final boolean firstStart)
    {
        try {
            final Resources resources = m_context.getResources();
            final String packageName = m_context.getPackageName();
            int id = resources.getIdentifier("qt_libs", "array", packageName);
            m_qtLibs =  prefferedAbiLibs(resources.getStringArray(id));

            id = resources.getIdentifier("use_local_qt_libs", "string", packageName);
            final int useLocalLibs = Integer.parseInt(resources.getString(id));

            if (useLocalLibs == 1) {
                ArrayList<String> libraryList = new ArrayList<>();

                boolean apkDeployFromSystem = false;
                String apkPath = m_context.getApplicationInfo().publicSourceDir;
                File apkFile = new File(apkPath);
                if (apkFile.exists()) {
                    for (String systemAppPath : SYSTEM_APP_PATHS) {
                        apkDeployFromSystem = apkFile.getAbsolutePath().startsWith(systemAppPath);
                        if (apkDeployFromSystem)
                            break;
                    }
                }

                String libsDir = null;
                String bundledLibsDir = null;
                if (apkDeployFromSystem) {
                    String systemLibsPrefix = SYSTEM_LIB_PATH;
                    if (m_contextInfo.metaData.containsKey("android.app.system_libs_prefix")) {
                        systemLibsPrefix = m_contextInfo.metaData.getString("android.app.system_libs_prefix");
                    } else {
                        Log.e(QtApplication.QtTAG, "It looks like app deployed as system app. "
                            + "It may be necessary to specify path to system lib directory using "
                            + "android.app.system_libs_prefix metadata variable in your AndroidManifest.xml");
                        Log.e(QtApplication.QtTAG, "Using " + SYSTEM_LIB_PATH + " as default path");
                    }
                    File systemLibraryDir = new File(systemLibsPrefix);
                    if (systemLibraryDir.exists() && systemLibraryDir.isDirectory() && systemLibraryDir.list().length > 0) {
                        libsDir = systemLibsPrefix;
                    } else {
                        Log.e(QtApplication.QtTAG,
                              "System library directory " + systemLibsPrefix
                                      + " does not exist or is empty.");
                    }
                } else {
                    String nativeLibraryPrefix = m_context.getApplicationInfo().nativeLibraryDir + "/";
                    File nativeLibraryDir = new File(nativeLibraryPrefix);
                    if (nativeLibraryDir.exists() && nativeLibraryDir.isDirectory() && nativeLibraryDir.list().length > 0) {
                        libsDir = nativeLibraryPrefix;
                        bundledLibsDir = nativeLibraryPrefix;
                    } else {
                        Log.e(QtApplication.QtTAG,
                              "Native library directory " + nativeLibraryPrefix
                                      + " does not exist or is empty.");
                    }
                }

                if (apkDeployFromSystem && libsDir == null)
                    throw new Exception("");


                if (m_qtLibs != null) {
                    String libPrefix = libsDir + "lib";
                    for (String lib : m_qtLibs)
                        libraryList.add(libPrefix + lib + ".so");
                }

                id = resources.getIdentifier("bundle_local_qt_libs", "string", packageName);
                final int bundleLocalLibs = Integer.parseInt(resources.getString(id));

                if (bundleLocalLibs == 1) {
                    id = resources.getIdentifier("load_local_libs", "array", packageName);
                    ArrayList<String> localLibs = prefferedAbiLibs(resources.getStringArray(id));
                    for (String libs : localLibs) {
                        for (String lib : libs.split(":")) {
                            if (!lib.isEmpty())
                                libraryList.add(libsDir + lib);
                        }
                    }
                    if (bundledLibsDir != null)
                        ENVIRONMENT_VARIABLES += "\tQT_BUNDLED_LIBS_PATH=" + bundledLibsDir;
                }

                Bundle loaderParams = new Bundle();
                loaderParams.putInt(ERROR_CODE_KEY, 0);
                loaderParams.putString(DEX_PATH_KEY, new String());
                loaderParams.putString(LOADER_CLASS_NAME_KEY, loaderClassName());

                id = resources.getIdentifier("static_init_classes", "string", packageName);
                loaderParams.putStringArray(STATIC_INIT_CLASSES_KEY, resources.getString(id)
                        .split(":"));

                loaderParams.putStringArrayList(NATIVE_LIBRARIES_KEY, libraryList);


                String themePath = m_context.getApplicationInfo().dataDir + "/qt-reserved-files/android-style/";
                String stylePath = themePath + m_displayDensity + "/";

                String extractOption = "default";
                if (m_contextInfo.metaData.containsKey("android.app.extract_android_style")) {
                    extractOption = m_contextInfo.metaData.getString("android.app.extract_android_style");
                    if (!extractOption.equals("default") && !extractOption.equals("full") && !extractOption.equals("minimal") && !extractOption.equals("none")) {
                        Log.e(QtApplication.QtTAG, "Invalid extract_android_style option \"" + extractOption + "\", defaulting to \"default\"");
                        extractOption = "default";
                   }
                }

                // QTBUG-69810: The extraction code will trigger compatibility warnings on Android SDK version >= 28
                // when the target SDK version is set to something lower then 28, so default to "none" and issue a warning
                // if that is the case.
                if (extractOption.equals("default")) {
                    final int targetSdkVersion = m_context.getApplicationInfo().targetSdkVersion;
                    if (targetSdkVersion < 28 && Build.VERSION.SDK_INT >= 28) {
                        Log.e(QtApplication.QtTAG, "extract_android_style option set to \"none\" when targetSdkVersion is less then 28");
                        extractOption = "none";
                    }
                }

                if (!(new File(stylePath)).exists() && !extractOption.equals("none")) {
                    loaderParams.putString(EXTRACT_STYLE_KEY, stylePath);
                    loaderParams.putBoolean(EXTRACT_STYLE_MINIMAL_KEY, extractOption.equals("minimal"));
                }

                if (extractOption.equals("full"))
                    ENVIRONMENT_VARIABLES += "\tQT_USE_ANDROID_NATIVE_STYLE=1";

                ENVIRONMENT_VARIABLES += "\tANDROID_STYLE_PATH=" + stylePath;

                loaderParams.putString(ENVIRONMENT_VARIABLES_KEY, ENVIRONMENT_VARIABLES);

                String appParams = null;
                if (APPLICATION_PARAMETERS != null)
                    appParams = APPLICATION_PARAMETERS;

                Intent intent = getIntent();
                if (intent != null) {
                    String parameters = intent.getStringExtra("applicationArguments");
                    if (parameters != null)
                        if (appParams == null)
                            appParams = parameters;
                        else
                            appParams += '\t' + parameters;
                }

                if (m_contextInfo.metaData.containsKey("android.app.arguments")) {
                    String parameters = m_contextInfo.metaData.getString("android.app.arguments");
                    if (appParams == null)
                        appParams = parameters;
                    else
                        appParams += '\t' + parameters;
                }

                if (appParams != null)
                    loaderParams.putString(APPLICATION_PARAMETERS_KEY, appParams.replace(' ', '\t').trim());

                loadApplication(loaderParams);
                return;
            }
        } catch (Exception e) {
            Log.e(QtApplication.QtTAG, "Can't create main activity", e);
        }
    }
}
