/*  Copyright (C) 2016-2020 Alberto, Andreas Shimokawa, Carsten Pfeiffer,
    Daniele Gobbetti, vanous

    This file is part of Gadgetbridge.

    Gadgetbridge is free software: you can redistribute it and/or modify
    it under the terms of the GNU Affero General Public License as published
    by the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    Gadgetbridge is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Affero General Public License for more details.

    You should have received a copy of the GNU Affero General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>. */
package nodomain.freeyourgadget.gadgetbridge.activities;

import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.SharedPreferences;
import android.database.Cursor;
import android.database.sqlite.SQLiteOpenHelper;
import android.net.Uri;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.provider.DocumentsContract;
import android.text.TextUtils;
import android.util.Pair;
import android.view.MenuItem;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;

import androidx.core.app.NavUtils;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

import nodomain.freeyourgadget.gadgetbridge.GBApplication;
import nodomain.freeyourgadget.gadgetbridge.R;
import nodomain.freeyourgadget.gadgetbridge.database.DBHandler;
import nodomain.freeyourgadget.gadgetbridge.database.DBHelper;
import nodomain.freeyourgadget.gadgetbridge.database.PeriodicExporter;
import nodomain.freeyourgadget.gadgetbridge.entities.Device;
import nodomain.freeyourgadget.gadgetbridge.util.AndroidUtils;
import nodomain.freeyourgadget.gadgetbridge.util.FileUtils;
import nodomain.freeyourgadget.gadgetbridge.util.GB;
import nodomain.freeyourgadget.gadgetbridge.util.GBPrefs;
import nodomain.freeyourgadget.gadgetbridge.util.ImportExportSharedPreferences;
import nodomain.freeyourgadget.gadgetbridge.util.Prefs;


public class DataManagementActivity extends AbstractGBActivity {
    private static final Logger LOG = LoggerFactory.getLogger(DataManagementActivity.class);
    private static SharedPreferences sharedPrefs;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_data_management);

        TextView dbPath = findViewById(R.id.activity_data_management_path);
        dbPath.setText(getExternalPath());

        Button exportDBButton = findViewById(R.id.exportDataButton);
        exportDBButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                exportDB();
            }
        });
        Button importDBButton = findViewById(R.id.importDataButton);
        importDBButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                importDB();
            }
        });

        Button showContentDataButton = findViewById(R.id.showContentDataButton);
        showContentDataButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                File export_path = null;
                try {
                    export_path = FileUtils.getExternalFilesDir();
                } catch (IOException e) {
                    e.printStackTrace();
                }

                AlertDialog.Builder builder = new AlertDialog.Builder(DataManagementActivity.this);
                builder.setTitle("Export/Import directory content:");

                ArrayAdapter<String> directory_listing = new ArrayAdapter<String>(DataManagementActivity.this, android.R.layout.simple_list_item_1, export_path.list());

                builder.setSingleChoiceItems(directory_listing, 0, new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                    }
                });

                AlertDialog dialog = builder.create();
                dialog.show();

            }
        });

        int oldDBVisibility = hasOldActivityDatabase() ? View.VISIBLE : View.GONE;

        TextView deleteOldActivityTitle = findViewById(R.id.mergeOldActivityDataTitle);
        deleteOldActivityTitle.setVisibility(oldDBVisibility);

        Button deleteOldActivityDBButton = findViewById(R.id.deleteOldActivityDB);
        deleteOldActivityDBButton.setVisibility(oldDBVisibility);
        deleteOldActivityDBButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                deleteOldActivityDbFile();
            }
        });

        Button deleteDBButton = findViewById(R.id.emptyDBButton);
        deleteDBButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                deleteActivityDatabase();
            }
        });

        Prefs prefs = GBApplication.getPrefs();
        boolean autoExportEnabled = prefs.getBoolean(GBPrefs.AUTO_EXPORT_ENABLED, false);
        int autoExportInterval = prefs.getInt(GBPrefs.AUTO_EXPORT_INTERVAL, 0);
        //returns an ugly content://...
        //String autoExportLocation = prefs.getString(GBPrefs.AUTO_EXPORT_LOCATION, "");

        int testExportVisibility = (autoExportInterval > 0 && autoExportEnabled) ? View.VISIBLE : View.GONE;

        TextView autoExportLocation_label = findViewById(R.id.autoExportLocation_label);
        autoExportLocation_label.setVisibility(testExportVisibility);

        TextView autoExportLocation_intro = findViewById(R.id.autoExportLocation_intro);
        autoExportLocation_intro.setVisibility(testExportVisibility);

        TextView autoExportLocation_path = findViewById(R.id.autoExportLocation_path);
        autoExportLocation_path.setVisibility(testExportVisibility);
        autoExportLocation_path.setText(getAutoExportLocationSummary());

        final Context context = getApplicationContext();
        Button testExportDBButton = findViewById(R.id.testExportDBButton);
        testExportDBButton.setVisibility(testExportVisibility);
        testExportDBButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                sendBroadcast(new Intent(context, PeriodicExporter.class));
                GB.toast(context,
                        context.getString(R.string.activity_DB_test_export_message),
                        Toast.LENGTH_SHORT, GB.INFO);
            }
        });

        sharedPrefs = PreferenceManager.getDefaultSharedPreferences(this);
    }

    private void showDirectoryContent() {
    }

    //would rather re-use method of SettingsActivity... but lifecycle...
    private String getAutoExportLocationSummary() {
        String autoExportLocation = GBApplication.getPrefs().getString(GBPrefs.AUTO_EXPORT_LOCATION, null);
        if (autoExportLocation == null) {
            return "";
        }
        Uri uri = Uri.parse(autoExportLocation);
        try {
            return AndroidUtils.getFilePath(getApplicationContext(), uri);
        } catch (IllegalArgumentException e) {
            try {
                Cursor cursor = getContentResolver().query(
                        uri,
                        new String[]{DocumentsContract.Document.COLUMN_DISPLAY_NAME},
                        null, null, null, null
                );
                if (cursor != null && cursor.moveToFirst()) {
                    return cursor.getString(cursor.getColumnIndex(DocumentsContract.Document.COLUMN_DISPLAY_NAME));
                }
            } catch (Exception fdfsdfds) {
                LOG.error("Error", fdfsdfds);
            }
        }
        return "";
    }


    private boolean hasOldActivityDatabase() {
        return new DBHelper(this).existsDB("ActivityDatabase");
    }

    private String getExternalPath() {
        try {
            return FileUtils.getExternalFilesDir().getAbsolutePath();
        } catch (Exception ex) {
            LOG.warn("Unable to get external files dir", ex);
        }
        return getString(R.string.dbmanagementactivvity_cannot_access_export_path);
    }

    private void exportShared() {
        try {
            File myPath = FileUtils.getExternalFilesDir();
            File myFile = new File(myPath, "Export_preference");
            ImportExportSharedPreferences.exportToFile(sharedPrefs, myFile, null);
        } catch (IOException ex) {
            GB.toast(this, getString(R.string.dbmanagementactivity_error_exporting_shared, ex.getMessage()), Toast.LENGTH_LONG, GB.ERROR, ex);
        }
        try (DBHandler lockHandler = GBApplication.acquireDB()) {
            List<Device> activeDevices = DBHelper.getActiveDevices(lockHandler.getDaoSession());
            for (Device dbDevice : activeDevices) {
                SharedPreferences deviceSharedPrefs = GBApplication.getDeviceSpecificSharedPrefs(dbDevice.getIdentifier());
                if (sharedPrefs != null) {
                    File myPath = FileUtils.getExternalFilesDir();
                    File myFile = new File(myPath, "Export_preference_" + dbDevice.getIdentifier());
                    try {
                        ImportExportSharedPreferences.exportToFile(deviceSharedPrefs, myFile, null);
                    } catch (Exception ignore) {
                        // some devices no not have device specific preferences
                    }
                }
            }
        } catch (Exception e) {
            GB.toast("Error exporting device specific preferences", Toast.LENGTH_SHORT, GB.ERROR, e);
        }
    }

    private void importShared() {
        try {
            File myPath = FileUtils.getExternalFilesDir();
            File myFile = new File(myPath, "Export_preference");
            ImportExportSharedPreferences.importFromFile(sharedPrefs, myFile);
        } catch (Exception ex) {
            GB.toast(DataManagementActivity.this, getString(R.string.dbmanagementactivity_error_importing_db, ex.getMessage()), Toast.LENGTH_LONG, GB.ERROR, ex);
        }

        try (DBHandler lockHandler = GBApplication.acquireDB()) {
            List<Device> activeDevices = DBHelper.getActiveDevices(lockHandler.getDaoSession());
            for (Device dbDevice : activeDevices) {
                SharedPreferences deviceSharedPrefs = GBApplication.getDeviceSpecificSharedPrefs(dbDevice.getIdentifier());
                if (sharedPrefs != null) {
                    File myPath = FileUtils.getExternalFilesDir();
                    File myFile = new File(myPath, "Export_preference_" + dbDevice.getIdentifier());
                    try {
                        ImportExportSharedPreferences.importFromFile(deviceSharedPrefs, myFile);
                    } catch (Exception ignore) {
                        // some devices no not have device specific preferences
                    }
                }
            }
        } catch (Exception e) {
            GB.toast("Error importing device specific preferences", Toast.LENGTH_SHORT, GB.ERROR);
        }
    }

    private void exportDB() {
        new AlertDialog.Builder(this)
                .setCancelable(true)
                .setTitle(R.string.dbmanagementactivity_export_data_title)
                .setMessage(R.string.dbmanagementactivity_export_confirmation)
                .setPositiveButton(R.string.activity_DB_ExportButton, new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        try (DBHandler dbHandler = GBApplication.acquireDB()) {
                            exportShared();
                            DBHelper helper = new DBHelper(DataManagementActivity.this);
                            File dir = FileUtils.getExternalFilesDir();
                            File destFile = helper.exportDB(dbHandler, dir);
                            GB.toast(DataManagementActivity.this, getString(R.string.dbmanagementactivity_exported_to, destFile.getAbsolutePath()), Toast.LENGTH_LONG, GB.INFO);
                        } catch (Exception ex) {
                            GB.toast(DataManagementActivity.this, getString(R.string.dbmanagementactivity_error_exporting_db, ex.getMessage()), Toast.LENGTH_LONG, GB.ERROR, ex);
                        }
                    }
                })
                .setNegativeButton(R.string.Cancel, new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                    }
                })
                .show();
    }

    private void importDB() {
        new AlertDialog.Builder(this)
                .setCancelable(true)
                .setTitle(R.string.dbmanagementactivity_import_data_title)
                .setMessage(R.string.dbmanagementactivity_overwrite_database_confirmation)
                .setPositiveButton(R.string.dbmanagementactivity_overwrite, new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        try (DBHandler dbHandler = GBApplication.acquireDB()) {
                            DBHelper helper = new DBHelper(DataManagementActivity.this);
                            File dir = FileUtils.getExternalFilesDir();
                            SQLiteOpenHelper sqLiteOpenHelper = dbHandler.getHelper();
                            File sourceFile = new File(dir, sqLiteOpenHelper.getDatabaseName());
                            helper.importDB(dbHandler, sourceFile);
                            helper.validateDB(sqLiteOpenHelper);
                            GB.toast(DataManagementActivity.this, getString(R.string.dbmanagementactivity_import_successful), Toast.LENGTH_LONG, GB.INFO);
                        } catch (Exception ex) {
                            GB.toast(DataManagementActivity.this, getString(R.string.dbmanagementactivity_error_importing_db, ex.getMessage()), Toast.LENGTH_LONG, GB.ERROR, ex);
                        }
                        importShared();
                    }
                })
                .setNegativeButton(R.string.Cancel, new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                    }
                })
                .show();
    }

    private void deleteActivityDatabase() {
        new AlertDialog.Builder(this)
                .setCancelable(true)
                .setTitle(R.string.dbmanagementactivity_delete_activity_data_title)
                .setMessage(R.string.dbmanagementactivity_really_delete_entire_db)
                .setPositiveButton(R.string.Delete, new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        if (GBApplication.deleteActivityDatabase(DataManagementActivity.this)) {
                            GB.toast(DataManagementActivity.this, getString(R.string.dbmanagementactivity_database_successfully_deleted), Toast.LENGTH_SHORT, GB.INFO);
                        } else {
                            GB.toast(DataManagementActivity.this, getString(R.string.dbmanagementactivity_db_deletion_failed), Toast.LENGTH_SHORT, GB.INFO);
                        }
                    }
                })
                .setNegativeButton(R.string.Cancel, new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                    }
                })
                .show();
    }

    private void deleteOldActivityDbFile() {
        new AlertDialog.Builder(this).setCancelable(true);
        new AlertDialog.Builder(this).setTitle(R.string.dbmanagementactivity_delete_old_activity_db);
        new AlertDialog.Builder(this).setMessage(R.string.dbmanagementactivity_delete_old_activitydb_confirmation);
        new AlertDialog.Builder(this).setPositiveButton(R.string.Delete, new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                if (GBApplication.deleteOldActivityDatabase(DataManagementActivity.this)) {
                    GB.toast(DataManagementActivity.this, getString(R.string.dbmanagementactivity_old_activity_db_successfully_deleted), Toast.LENGTH_SHORT, GB.INFO);
                } else {
                    GB.toast(DataManagementActivity.this, getString(R.string.dbmanagementactivity_old_activity_db_deletion_failed), Toast.LENGTH_SHORT, GB.INFO);
                }
            }
        });
        new AlertDialog.Builder(this).setNegativeButton(R.string.Cancel, new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
            }
        });
        new AlertDialog.Builder(this).show();
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        if (item.getItemId() == android.R.id.home) {
            NavUtils.navigateUpFromSameTask(this);
            return true;
        }
        return super.onOptionsItemSelected(item);
    }
}