/*
 * Copyright © 2013 – 2016 Ricki Hirner (bitfire web engineering).
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the GNU Public License v3.0
 * which accompanies this distribution, and is available at
 * http://www.gnu.org/licenses/gpl.html
 */

package at.bitfire.davdroid.ui.setup;

import android.app.Activity;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.CompoundButton;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.RadioButton;

import org.apache.commons.lang3.StringUtils;

import java.net.IDN;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.logging.Level;

import at.bitfire.dav4android.Constants;
import at.bitfire.davdroid.R;
import at.bitfire.davdroid.ui.widget.EditPassword;

public class LoginCredentialsFragment extends Fragment implements CompoundButton.OnCheckedChangeListener {

    RadioButton radioUseEmail;
    LinearLayout emailDetails;
    EditText editEmailAddress;
    EditPassword editEmailPassword;

    RadioButton radioUseURL;
    LinearLayout urlDetails;
    EditText editBaseURL, editUserName;
    EditPassword editUrlPassword;


    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View v = inflater.inflate(R.layout.login_credentials_fragment, container, false);

        radioUseEmail = (RadioButton)v.findViewById(R.id.login_type_email);
        emailDetails = (LinearLayout)v.findViewById(R.id.login_type_email_details);
        editEmailAddress = (EditText)v.findViewById(R.id.email_address);
        editEmailPassword = (EditPassword)v.findViewById(R.id.email_password);

        radioUseURL = (RadioButton)v.findViewById(R.id.login_type_url);
        urlDetails = (LinearLayout)v.findViewById(R.id.login_type_url_details);
        editBaseURL = (EditText)v.findViewById(R.id.base_url);
        editUserName = (EditText)v.findViewById(R.id.user_name);
        editUrlPassword = (EditPassword)v.findViewById(R.id.url_password);

        radioUseEmail.setOnCheckedChangeListener(this);
        radioUseURL.setOnCheckedChangeListener(this);

        if (savedInstanceState == null) {
            // first call

            Activity activity = getActivity();
            Intent intent = (activity != null) ? activity.getIntent() : null;
            if (intent != null) {
                // we've got initial login data
                String  url = intent.getStringExtra(LoginActivity.EXTRA_URL),
                        username = intent.getStringExtra(LoginActivity.EXTRA_USERNAME),
                        password = intent.getStringExtra(LoginActivity.EXTRA_PASSWORD);

                if (url != null) {
                    radioUseURL.setChecked(true);
                    editBaseURL.setText(url);
                    editUserName.setText(username);
                    editUrlPassword.setText(password);
                } else {
                    radioUseEmail.setChecked(true);
                    editEmailAddress.setText(username);
                    editEmailPassword.setText(password);
                }

            } else
                radioUseEmail.setChecked(true);
        }

        final Button login = (Button)v.findViewById(R.id.login);
        login.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                LoginCredentials credentials = validateLoginData();
                if (credentials != null)
                    DetectConfigurationFragment.newInstance(credentials).show(getFragmentManager(), null);
            }
        });

        return v;
    }

    @Override
    public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
        if (isChecked) {
            boolean loginByEmail = buttonView == radioUseEmail;
            emailDetails.setVisibility(loginByEmail ? View.VISIBLE : View.GONE);
            urlDetails.setVisibility(loginByEmail ? View.GONE : View.VISIBLE);
            (loginByEmail ? editEmailAddress : editBaseURL).requestFocus();
        }
    }

    protected LoginCredentials validateLoginData() {
        if (radioUseEmail.isChecked()) {
            URI uri = null;
            boolean valid = true;

            String email = editEmailAddress.getText().toString();
            if (!email.matches(".+@.+")) {
                editEmailAddress.setError(getString(R.string.login_email_address_error));
                valid = false;
            } else
                try {
                    uri = new URI("mailto", email, null);
                } catch (URISyntaxException e) {
                    editEmailAddress.setError(e.getLocalizedMessage());
                    valid = false;
                }

            String password = editEmailPassword.getText().toString();
            if (password.isEmpty()) {
                editEmailPassword.setError(getString(R.string.login_password_required));
                valid = false;
            }

            return valid ? new LoginCredentials(uri, email, password) : null;

        } else if (radioUseURL.isChecked()) {
            URI uri = null;
            boolean valid = true;

            Uri baseUrl = Uri.parse(editBaseURL.getText().toString());
            String scheme = baseUrl.getScheme();
            if ("https".equalsIgnoreCase(scheme) || "http".equalsIgnoreCase(scheme)) {
                String host = baseUrl.getHost();
                if (StringUtils.isEmpty(host)) {
                    editBaseURL.setError(getString(R.string.login_url_host_name_required));
                    valid = false;
                } else
                    try {
                        host = IDN.toASCII(host);
                    } catch(IllegalArgumentException e) {
                        Constants.log.log(Level.WARNING, "Host name not conforming to RFC 3490", e);
                    }

                String path = baseUrl.getEncodedPath();
                int port = baseUrl.getPort();
                try {
                    uri = new URI(baseUrl.getScheme(), null, host, port, path, null, null);
                } catch (URISyntaxException e) {
                    editBaseURL.setError(e.getLocalizedMessage());
                    valid = false;
                }
            } else {
                editBaseURL.setError(getString(R.string.login_url_must_be_http_or_https));
                valid = false;
            }

            String userName = editUserName.getText().toString();
            if (userName.isEmpty()) {
                editUserName.setError(getString(R.string.login_user_name_required));
                valid = false;
            }

            String password = editUrlPassword.getText().toString();
            if (password.isEmpty()) {
                editUrlPassword.setError(getString(R.string.login_password_required));
                valid = false;
            }

            return valid ? new LoginCredentials(uri, userName, password) : null;
        }

        return null;
    }

}