package co.polylearn.toeic;

import android.accounts.Account;
import android.app.IntentService;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.os.ResultReceiver;

import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.VolleyLog;
import com.android.volley.toolbox.JsonObjectRequest;
import com.google.android.gms.auth.GoogleAuthException;
import com.google.android.gms.auth.GoogleAuthUtil;
import com.google.android.gms.common.Scopes;

import org.json.JSONException;
import org.json.JSONObject;

import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.util.HashMap;

/**
 * An {@link IntentService} subclass for handling asynchronous task requests in
 * a service on a separate handler thread.
 * <p>
 * helper methods.
 */
public class AuthService extends IntentService {
    public static final int SUCCESS_AUTH = 1;
    public static final int ERROR_AUTH = 2;
    public static final String KEY_STATUS_CODE = "co.polylearn.toeic.extra.STATUS_CODE";
    public static final String KEY_NETWORK_RESPONSE = "co.polylearn.toeic.extra.NETWORK_RESPONSE";
    private static final String ACTION_FACEBOOK_LOGIN = "co.polylearn.toeic.action.FACEBOOK_LOGIN";
    private static final String ACTION_GOOGLE_LOGIN = "co.polylearn.toeic.action.GOOGLE_LOGIN";
    private static final String ACTION_REGISTER = "co.polylearn.toeic.action.REGISTER";
    private static final String ACTION_PASSWORD_LOGIN = "co.polylearn.toeic.action.PASSWORD_LOGIN";
    private static final String EXTRA_ACCESS_TOKEN = "co.polylearn.toeic.extra.ACCESS_TOKEN";
    private static final String EXTRA_RECEIVER = "co.polylearn.toeic.extra.RECEIVER";
    private static final String EXTRA_EMAIL = "co.polylearn.toeic.extra.EMAIL";
    private static final String EXTRA_PASSWORD = "co.polylearn.toeic.extra.PASSWORD";



    public AuthService() {
        super("AuthService");
    }

    /**
     * Starts this service to perform action Facebook Login with the given parameters. If
     * the service is already performing a task this action will be queued.
     *
     * @see IntentService
     */
    public static void startActionFacebookLogin(Context context, String token, ResultReceiver resultReceiver) {
        Intent intent = new Intent(context, AuthService.class);
        intent.setAction(ACTION_FACEBOOK_LOGIN);
        intent.putExtra(EXTRA_ACCESS_TOKEN, token);
        intent.putExtra(EXTRA_RECEIVER, resultReceiver);
        context.startService(intent);
    }

    /**
     * Starts this service to perform action Google Login with the given parameters. If
     * the service is already performing a task this action will be queued.
     *
     * @see IntentService
     */
    public static void startActionGoogleLogin(Context context, String email, ResultReceiver resultReceiver) {
        Intent intent = new Intent(context, AuthService.class);
        intent.setAction(ACTION_GOOGLE_LOGIN);
        intent.putExtra(EXTRA_EMAIL, email);
        intent.putExtra(EXTRA_RECEIVER, resultReceiver);
        context.startService(intent);
    }

    /**
     * Starts this service to perform action Register Login with the given parameters. If
     * the service is already performing a task this action will be queued.
     *
     * @see IntentService
     */
    public static void startActionRegister(Context context, String email, String password, ResultReceiver resultReceiver) {
        Intent intent = new Intent(context, AuthService.class);
        intent.setAction(ACTION_REGISTER);
        intent.putExtra(EXTRA_EMAIL, email);
        intent.putExtra(EXTRA_PASSWORD, password);
        intent.putExtra(EXTRA_RECEIVER, resultReceiver);
        context.startService(intent);
    }

    public static void startActionPasswordLogin(Context context, String email, String password, ResultReceiver resultReceiver) {
        Intent intent = new Intent(context, AuthService.class);
        intent.setAction(ACTION_PASSWORD_LOGIN);
        intent.putExtra(EXTRA_EMAIL, email);
        intent.putExtra(EXTRA_PASSWORD, password);
        intent.putExtra(EXTRA_RECEIVER, resultReceiver);
        context.startService(intent);
    }

    @Override
    protected void onHandleIntent(Intent intent) {
        if (intent != null) {
            final String action = intent.getAction();
            final ResultReceiver receiver = intent.getParcelableExtra(EXTRA_RECEIVER);
            if (ACTION_FACEBOOK_LOGIN.equals(action)) {
                final String token = intent.getStringExtra(EXTRA_ACCESS_TOKEN);
                handleActionFacebookLogin(token, receiver);
            } else if (ACTION_GOOGLE_LOGIN.equals(action)) {
                final String email = intent.getStringExtra(EXTRA_EMAIL);
                handleActionGoogleLogin(email, receiver);
            } else if (ACTION_PASSWORD_LOGIN.equals(action) || ACTION_REGISTER.equals(action)) {
                final String email = intent.getStringExtra(EXTRA_EMAIL);
                final String password = intent.getStringExtra(EXTRA_PASSWORD);
                if (ACTION_PASSWORD_LOGIN.equals(action)) {
                    handleActionPasswordLogin(email, password, receiver);
                } else {
                    handleActionRegister(email, password, receiver);
                }
            }
        }
    }

    /**
     * Handle action Password Login in the provided background thread with the provided
     * parameters.
     */
    private void handleActionPasswordLogin(final String email, final String password, final ResultReceiver receiver) {
        final String URL = "https://api.polylearn.co/login";

        sendWithCredentials(email, password, URL, receiver);
    }


    /**
     * Handle action Password Login in the provided background thread with the provided
     * parameters.
     */
    private void handleActionRegister(final String email, final String password, final ResultReceiver receiver) {
        final String URL = "https://api.polylearn.co/register";

        sendWithCredentials(email, password, URL, receiver);
    }

    private void sendWithCredentials(final String email, final String password, final String URL, final ResultReceiver receiver) {
        HashMap<String, String> params = new HashMap<>();
        params.put("username", email);
        params.put("password", password);

        VolleySingleton.getInstance(getApplicationContext()).addToRequestQueue(
                getTokenRequest(URL, params, receiver)
        );
    }

    /**
     * Handle action Facebook Login in the provided background thread with the provided
     * parameters.
     */
    private void handleActionFacebookLogin(String token, final ResultReceiver receiver) {
        final String URL = "https://api.polylearn.co/facebook/auth";
        handleSocialLogin(URL, token, receiver);
    }

    /**
     * Handle action Google Login in the provided background thread with the provided
     * parameters.
     */
    private void handleActionGoogleLogin(String email, final ResultReceiver receiver) {
        final String URL = "https://api.polylearn.co/google/auth";
        String token = null;

        try {

            token = GoogleAuthUtil.getToken(getApplicationContext(), new Account(email, "com.google"), "oauth2:"
                    + Scopes.EMAIL);
        } catch (IOException | GoogleAuthException e) {
            e.printStackTrace();
        }

        handleSocialLogin(URL, token, receiver);
    }

    private void handleSocialLogin(final String URL, final String token, final ResultReceiver receiver) {
        HashMap<String, String> params = new HashMap<>();
        params.put("access_token", token);

        VolleySingleton.getInstance(getApplicationContext()).addToRequestQueue(
                getTokenRequest(URL, params, receiver)
        );
    }

    private JsonObjectRequest getTokenRequest(final String URL, final HashMap<String, String> params, final ResultReceiver receiver) {
        return new JsonObjectRequest(URL, new JSONObject(params),
                new Response.Listener<JSONObject>() {
                    @Override
                    public void onResponse(JSONObject response) {
                        String token = null;
                        try {
                            token = (String) response.get("token");
                        } catch (JSONException e) {
                            e.printStackTrace();
                        }

                        Bundle args = new Bundle();
                        args.putString("token", token);
                        receiver.send(SUCCESS_AUTH, args);
                    }
                }, new Response.ErrorListener() {
            @Override
            public void onErrorResponse(VolleyError error) {
                VolleyLog.e("Error: ", error.getMessage());
                Bundle args = new Bundle();
                args.putInt(KEY_STATUS_CODE, error.networkResponse.statusCode);
                args.putString(KEY_NETWORK_RESPONSE, new String(error.networkResponse.data, StandardCharsets.UTF_8));
                receiver.send(ERROR_AUTH, args);
            }
        });
    }
}