package eu.siacs.conversations.ui;

import android.app.AlertDialog;
import android.content.Intent;
import androidx.databinding.DataBindingUtil;
import android.os.Bundle;
import androidx.appcompat.widget.Toolbar;
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.View;
import android.widget.EditText;

import org.jetbrains.annotations.NotNull;

import java.util.concurrent.atomic.AtomicBoolean;

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;

public class EnterPhoneNumberActivity extends XmppActivity implements QuickConversationsService.OnVerificationRequested {

    private static final int REQUEST_CHOOSE_COUNTRY = 0x1234;

    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
    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);
        setSupportActionBar((Toolbar) 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 void onSaveInstanceState(@NotNull 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));
    }
}