package eu.siacs.conversations.ui;

import android.content.ComponentName;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.ServiceConnection;
import android.net.Uri;
import android.os.Bundle;
import android.os.IBinder;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;

import androidx.appcompat.app.AlertDialog;
import androidx.core.content.ContextCompat;
import androidx.databinding.DataBindingUtil;

import com.google.android.material.snackbar.Snackbar;

import java.io.IOException;
import java.util.List;

import eu.siacs.conversations.Config;
import eu.siacs.conversations.R;
import eu.siacs.conversations.databinding.ActivityImportBackupBinding;
import eu.siacs.conversations.databinding.DialogEnterPasswordBinding;
import eu.siacs.conversations.services.ImportBackupService;
import eu.siacs.conversations.ui.adapter.BackupFileAdapter;
import eu.siacs.conversations.utils.ThemeHelper;

public class ImportBackupActivity extends ActionBarActivity implements ServiceConnection, ImportBackupService.OnBackupFilesLoaded, BackupFileAdapter.OnItemClickedListener, ImportBackupService.OnBackupProcessed {

    private ActivityImportBackupBinding binding;

    private BackupFileAdapter backupFileAdapter;
    private ImportBackupService service;

    private boolean mLoadingState = false;

    private int mTheme;

    @Override
    protected void onCreate(final Bundle savedInstanceState) {
        this.mTheme = ThemeHelper.find(this);
        setTheme(this.mTheme);
        super.onCreate(savedInstanceState);
        binding = DataBindingUtil.setContentView(this, R.layout.activity_import_backup);
        setSupportActionBar(binding.toolbar);
        setLoadingState(savedInstanceState != null && savedInstanceState.getBoolean("loading_state", false));
        this.backupFileAdapter = new BackupFileAdapter();
        this.binding.list.setAdapter(this.backupFileAdapter);
        this.backupFileAdapter.setOnItemClickedListener(this);
    }

    @Override
    public boolean onCreateOptionsMenu(final Menu menu) {
        getMenuInflater().inflate(R.menu.import_backup, menu);
        final MenuItem openBackup = menu.findItem(R.id.action_open_backup_file);
        openBackup.setVisible(!this.mLoadingState);
        return true;
    }

    @Override
    public void onSaveInstanceState(Bundle bundle) {
        bundle.putBoolean("loading_state", this.mLoadingState);
        super.onSaveInstanceState(bundle);
    }

    @Override
    public void onStart() {
        super.onStart();
        final int theme = ThemeHelper.find(this);
        if (this.mTheme != theme) {
            recreate();
        } else {
            bindService(new Intent(this, ImportBackupService.class), this, Context.BIND_AUTO_CREATE);
        }
        final Intent intent = getIntent();
        if (intent != null && Intent.ACTION_VIEW.equals(intent.getAction()) && !this.mLoadingState) {
            Uri uri = intent.getData();
            if (uri != null) {
                openBackupFileFromUri(uri, true);
            }
        }
    }

    @Override
    public void onStop() {
        super.onStop();
        if (this.service != null) {
            this.service.removeOnBackupProcessedListener(this);
        }
        unbindService(this);
    }

    @Override
    public void onServiceConnected(ComponentName name, IBinder service) {
        ImportBackupService.ImportBackupServiceBinder binder = (ImportBackupService.ImportBackupServiceBinder) service;
        this.service = binder.getService();
        this.service.addOnBackupProcessedListener(this);
        setLoadingState(this.service.getLoadingState());
        this.service.loadBackupFiles(this);
    }

    @Override
    public void onServiceDisconnected(ComponentName name) {
        this.service = null;
    }

    @Override
    public void onBackupFilesLoaded(final List<ImportBackupService.BackupFile> files) {
        runOnUiThread(() -> backupFileAdapter.setFiles(files));
    }

    @Override
    public void onClick(final ImportBackupService.BackupFile backupFile) {
        showEnterPasswordDialog(backupFile, false);
    }

    private void openBackupFileFromUri(final Uri uri, final boolean finishOnCancel) {
        new Thread(() -> {
                try {
                    final ImportBackupService.BackupFile backupFile = ImportBackupService.BackupFile.read(this, uri);
                    runOnUiThread(() -> showEnterPasswordDialog(backupFile, finishOnCancel));
                } catch (final IOException | IllegalArgumentException e) {
                    Log.d(Config.LOGTAG, "unable to open backup file " + uri, e);
                    runOnUiThread(() -> Snackbar.make(binding.coordinator, R.string.not_a_backup_file, Snackbar.LENGTH_LONG).show());
                }
        }).start();
    }

    private void showEnterPasswordDialog(final ImportBackupService.BackupFile backupFile, final boolean finishOnCancel) {
        final DialogEnterPasswordBinding enterPasswordBinding = DataBindingUtil.inflate(LayoutInflater.from(this), R.layout.dialog_enter_password, null, false);
        Log.d(Config.LOGTAG, "attempting to import " + backupFile.getUri());
        enterPasswordBinding.explain.setText(getString(R.string.enter_password_to_restore, backupFile.getHeader().getJid().toString()));
        AlertDialog.Builder builder = new AlertDialog.Builder(this);
        builder.setView(enterPasswordBinding.getRoot());
        builder.setTitle(R.string.enter_password);
        builder.setNegativeButton(R.string.cancel, (dialog, which) -> {
            if (finishOnCancel) {
                finish();
            }
        });
        builder.setPositiveButton(R.string.restore, null);
        builder.setCancelable(false);
        final AlertDialog dialog = builder.create();
        dialog.setOnShowListener((d) -> {
            dialog.getButton(DialogInterface.BUTTON_POSITIVE).setOnClickListener(v -> {
                final String password = enterPasswordBinding.accountPassword.getEditableText().toString();
                if (password.isEmpty()) {
                    enterPasswordBinding.accountPasswordLayout.setError(getString(R.string.please_enter_password));
                    return;
                }
                final Uri uri = backupFile.getUri();
                Intent intent = new Intent(this, ImportBackupService.class);
                intent.setAction(Intent.ACTION_SEND);
                intent.putExtra("password", password);
                if ("file".equals(uri.getScheme())) {
                    intent.putExtra("file", uri.getPath());
                } else {
                    intent.setData(uri);
                    intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
                }
                setLoadingState(true);
                ContextCompat.startForegroundService(this, intent);
                d.dismiss();
            });
        });
        dialog.show();
    }

    private void setLoadingState(final boolean loadingState) {
        binding.coordinator.setVisibility(loadingState ? View.GONE : View.VISIBLE);
        binding.inProgress.setVisibility(loadingState ? View.VISIBLE : View.GONE);
        setTitle(loadingState ? R.string.restoring_backup : R.string.restore_backup);
        configureActionBar(getSupportActionBar(), !loadingState);
        this.mLoadingState = loadingState;
        invalidateOptionsMenu();
    }

    @Override
    public void onActivityResult(int requestCode, int resultCode, Intent intent) {
        super.onActivityResult(requestCode, resultCode, intent);
        if (resultCode == RESULT_OK) {
            if (requestCode == 0xbac) {
                openBackupFileFromUri(intent.getData(), false);
            }
        }
    }

    @Override
    public void onAccountAlreadySetup() {
        runOnUiThread(() -> {
            setLoadingState(false);
            Snackbar.make(binding.coordinator, R.string.account_already_setup, Snackbar.LENGTH_LONG).show();
        });
    }

    @Override
    public void onBackupRestored() {
        runOnUiThread(() -> {
            Intent intent = new Intent(this, ConversationActivity.class);
            intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);
            startActivity(intent);
            finish();
        });
    }

    @Override
    public void onBackupDecryptionFailed() {
        runOnUiThread(() -> {
            setLoadingState(false);
            Snackbar.make(binding.coordinator, R.string.unable_to_decrypt_backup, Snackbar.LENGTH_LONG).show();
        });
    }

    @Override
    public void onBackupRestoreFailed() {
        runOnUiThread(() -> {
            setLoadingState(false);
            Snackbar.make(binding.coordinator, R.string.unable_to_restore_backup, Snackbar.LENGTH_LONG).show();
        });
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        if (item.getItemId() == R.id.action_open_backup_file) {
            openBackupFile();
            return true;
        }
        return super.onOptionsItemSelected(item);
    }

    private void openBackupFile() {
        final Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
        intent.setType("*/*");
        intent.putExtra(Intent.EXTRA_ALLOW_MULTIPLE, false);
        intent.addCategory(Intent.CATEGORY_OPENABLE);
        startActivityForResult(Intent.createChooser(intent, getString(R.string.open_backup)), 0xbac);
    }
}