package eu.siacs.conversations.ui;

import static eu.siacs.conversations.utils.PermissionUtils.allGranted;

import android.Manifest;
import android.app.AlertDialog;
import android.content.Intent;
import android.os.Bundle;
import android.text.Editable;
import android.text.Html;
import android.text.TextUtils;
import android.text.TextWatcher;
import android.util.Log;
import android.view.KeyEvent;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;
import androidx.annotation.NonNull;
import androidx.databinding.DataBindingUtil;
import eu.siacs.conversations.Config;
import eu.siacs.conversations.R;
import eu.siacs.conversations.databinding.ActivityEnterNumberBinding;
import eu.siacs.conversations.entities.Account;
import eu.siacs.conversations.services.QuickConversationsService;
import eu.siacs.conversations.ui.drawable.TextDrawable;
import eu.siacs.conversations.ui.util.ApiDialogHelper;
import eu.siacs.conversations.utils.AccountUtils;
import eu.siacs.conversations.utils.LocationProvider;
import eu.siacs.conversations.utils.PhoneNumberUtilWrapper;
import io.michaelrocks.libphonenumber.android.NumberParseException;
import io.michaelrocks.libphonenumber.android.PhoneNumberUtil;
import io.michaelrocks.libphonenumber.android.Phonenumber;
import java.util.Arrays;
import java.util.concurrent.atomic.AtomicBoolean;

public class EnterPhoneNumberActivity extends XmppActivity
        implements QuickConversationsService.OnVerificationRequested {

    private static final int REQUEST_CHOOSE_COUNTRY = 0x1234;
    private static final int REQUEST_IMPORT_BACKUP = 0x63fb;

    private ActivityEnterNumberBinding binding;

    private final AtomicBoolean redirectInProgress = new AtomicBoolean(false);

    private String region = null;
    private final TextWatcher countryCodeTextWatcher =
            new TextWatcher() {
                @Override
                public void beforeTextChanged(CharSequence s, int start, int count, int after) {}

                @Override
                public void onTextChanged(CharSequence s, int start, int before, int count) {}

                @Override
                public void afterTextChanged(Editable editable) {
                    final String text = editable.toString();
                    try {
                        final int oldCode =
                                region != null
                                        ? PhoneNumberUtilWrapper.getInstance(
                                                        EnterPhoneNumberActivity.this)
                                                .getCountryCodeForRegion(region)
                                        : 0;
                        final int code = Integer.parseInt(text);
                        if (oldCode != code) {
                            region =
                                    PhoneNumberUtilWrapper.getInstance(
                                                    EnterPhoneNumberActivity.this)
                                            .getRegionCodeForCountryCode(code);
                        }
                        if ("ZZ".equals(region)) {
                            binding.country.setText(
                                    TextUtils.isEmpty(text)
                                            ? R.string.choose_a_country
                                            : R.string.invalid_country_code);
                        } else {
                            binding.number.requestFocus();
                            binding.country.setText(
                                    PhoneNumberUtilWrapper.getCountryForCode(region));
                        }
                    } catch (NumberFormatException e) {
                        binding.country.setText(
                                TextUtils.isEmpty(text)
                                        ? R.string.choose_a_country
                                        : R.string.invalid_country_code);
                    }
                }
            };
    private boolean requestingVerification = false;

    @Override
    protected void refreshUiReal() {}

    @Override
    public void onBackendConnected() {
        xmppConnectionService
                .getQuickConversationsService()
                .addOnVerificationRequestedListener(this);
        final Account account = AccountUtils.getFirst(xmppConnectionService);
        if (account != null) {
            runOnUiThread(this::performRedirectToVerificationActivity);
        }
    }

    @Override
    protected void onCreate(final Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        String region = savedInstanceState != null ? savedInstanceState.getString("region") : null;
        boolean requestingVerification =
                savedInstanceState != null
                        && savedInstanceState.getBoolean("requesting_verification", false);
        if (region != null) {
            this.region = region;
        } else {
            this.region = LocationProvider.getUserCountry(this);
        }

        this.binding = DataBindingUtil.setContentView(this, R.layout.activity_enter_number);
        this.binding.countryCode.setCompoundDrawables(
                new TextDrawable(this.binding.countryCode, "+"), null, null, null);
        this.binding.country.setOnClickListener(this::onSelectCountryClick);
        this.binding.next.setOnClickListener(this::onNextClick);
        Activities.setStatusAndNavigationBarColors(this, binding.getRoot());
        setSupportActionBar(this.binding.toolbar);
        this.binding.countryCode.addTextChangedListener(this.countryCodeTextWatcher);
        this.binding.countryCode.setText(
                String.valueOf(
                        PhoneNumberUtilWrapper.getInstance(this)
                                .getCountryCodeForRegion(this.region)));
        this.binding.number.setOnKeyListener(
                (v, keyCode, event) -> {
                    if (event.getAction() != KeyEvent.ACTION_DOWN) {
                        return false;
                    }
                    final EditText editText = (EditText) v;
                    final boolean cursorAtZero =
                            editText.getSelectionEnd() == 0 && editText.getSelectionStart() == 0;
                    if (keyCode == KeyEvent.KEYCODE_DEL
                            && (cursorAtZero || editText.getText().length() == 0)) {
                        final Editable countryCode = this.binding.countryCode.getText();
                        if (countryCode.length() > 0) {
                            countryCode.delete(countryCode.length() - 1, countryCode.length());
                            this.binding.countryCode.setSelection(countryCode.length());
                        }
                        this.binding.countryCode.requestFocus();
                        return true;
                    }
                    return false;
                });
        setRequestingVerificationState(requestingVerification);
    }

    @Override
    public boolean onCreateOptionsMenu(final Menu menu) {
        getMenuInflater().inflate(R.menu.verify_phone_number_menu, menu);
        return super.onCreateOptionsMenu(menu);
    }

    @Override
    public boolean onOptionsItemSelected(final MenuItem item) {
        if (item.getItemId() == R.id.action_import_backup) {
            if (hasStoragePermission(REQUEST_IMPORT_BACKUP)) {
                startActivity(new Intent(this, ImportBackupActivity.class));
            }
            return true;
        } else {
            return super.onOptionsItemSelected(item);
        }
    }

    @Override
    public void onRequestPermissionsResult(
            int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        UriHandlerActivity.onRequestPermissionResult(this, requestCode, grantResults);
        if (grantResults.length > 0) {
            if (allGranted(grantResults)) {
                if (requestCode == REQUEST_IMPORT_BACKUP) {
                    startActivity(new Intent(this, ImportBackupActivity.class));
                }
            } else if (Arrays.asList(permissions)
                    .contains(Manifest.permission.WRITE_EXTERNAL_STORAGE)) {
                Toast.makeText(this, R.string.no_storage_permission, Toast.LENGTH_SHORT).show();
            }
        }
    }

    @Override
    public void onSaveInstanceState(@NonNull Bundle savedInstanceState) {
        if (this.region != null) {
            savedInstanceState.putString("region", this.region);
        }
        savedInstanceState.putBoolean("requesting_verification", this.requestingVerification);
        super.onSaveInstanceState(savedInstanceState);
    }

    @Override
    public void onStop() {
        if (xmppConnectionService != null) {
            xmppConnectionService
                    .getQuickConversationsService()
                    .removeOnVerificationRequestedListener(this);
        }
        super.onStop();
    }

    private void onNextClick(View v) {
        final AlertDialog.Builder builder = new AlertDialog.Builder(this);
        try {
            final Editable number = this.binding.number.getText();
            final String input = number.toString();
            final Phonenumber.PhoneNumber phoneNumber =
                    PhoneNumberUtilWrapper.getInstance(this).parse(input, region);
            this.binding.countryCode.setText(String.valueOf(phoneNumber.getCountryCode()));
            number.clear();
            number.append(String.valueOf(phoneNumber.getNationalNumber()));
            final String formattedPhoneNumber =
                    PhoneNumberUtilWrapper.getInstance(this)
                            .format(phoneNumber, PhoneNumberUtil.PhoneNumberFormat.INTERNATIONAL)
                            .replace(' ', '\u202F');

            if (PhoneNumberUtilWrapper.getInstance(this).isValidNumber(phoneNumber)) {
                builder.setMessage(
                        Html.fromHtml(
                                getString(R.string.we_will_be_verifying, formattedPhoneNumber)));
                builder.setNegativeButton(R.string.edit, null);
                builder.setPositiveButton(
                        R.string.ok, (dialog, which) -> onPhoneNumberEntered(phoneNumber));
            } else {
                builder.setMessage(
                        getString(R.string.not_a_valid_phone_number, formattedPhoneNumber));
                builder.setPositiveButton(R.string.ok, null);
            }
            Log.d(Config.LOGTAG, phoneNumber.toString());
        } catch (NumberParseException e) {
            builder.setMessage(R.string.please_enter_your_phone_number);
            builder.setPositiveButton(R.string.ok, null);
        }
        builder.create().show();
    }

    private void onSelectCountryClick(View view) {
        final Intent intent = new Intent(this, ChooseCountryActivity.class);
        startActivityForResult(intent, REQUEST_CHOOSE_COUNTRY);
    }

    private void onPhoneNumberEntered(Phonenumber.PhoneNumber phoneNumber) {
        setRequestingVerificationState(true);
        xmppConnectionService.getQuickConversationsService().requestVerification(phoneNumber);
    }

    private void setRequestingVerificationState(boolean requesting) {
        this.requestingVerification = requesting;
        this.binding.countryCode.setEnabled(!requesting);
        this.binding.country.setEnabled(!requesting);
        this.binding.number.setEnabled(!requesting);
        this.binding.next.setEnabled(!requesting);
        this.binding.next.setText(requesting ? R.string.requesting_sms : R.string.next);
        this.binding.progressBar.setVisibility(requesting ? View.VISIBLE : View.GONE);
        this.binding.progressBar.setIndeterminate(requesting);
    }

    @Override
    public void onActivityResult(int requestCode, int resultCode, final Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (resultCode == RESULT_OK && requestCode == REQUEST_CHOOSE_COUNTRY) {
            final String region = data.getStringExtra("region");
            if (region != null) {
                this.region = region;
                final int countryCode =
                        PhoneNumberUtilWrapper.getInstance(this).getCountryCodeForRegion(region);
                this.binding.countryCode.setText(String.valueOf(countryCode));
            }
        }
    }

    private void performRedirectToVerificationActivity(long timestamp) {
        if (redirectInProgress.compareAndSet(false, true)) {
            Intent intent = new Intent(this, VerifyActivity.class);
            intent.putExtra(VerifyActivity.EXTRA_RETRY_SMS_AFTER, timestamp);
            startActivity(intent);
            finish();
        }
    }

    private void performRedirectToVerificationActivity() {
        if (redirectInProgress.compareAndSet(false, true)) {
            startActivity(new Intent(this, VerifyActivity.class));
            finish();
        }
    }

    @Override
    public void onVerificationRequestFailed(int code) {
        runOnUiThread(
                () -> {
                    setRequestingVerificationState(false);
                    ApiDialogHelper.createError(this, code).show();
                });
    }

    @Override
    public void onVerificationRequested() {
        runOnUiThread(this::performRedirectToVerificationActivity);
    }

    @Override
    public void onVerificationRequestedRetryAt(long timestamp) {
        runOnUiThread(() -> performRedirectToVerificationActivity(timestamp));
    }
}