package com.juick.server;

import com.github.messenger4j.Messenger;
import com.github.messenger4j.exception.MessengerApiException;
import com.github.messenger4j.exception.MessengerIOException;
import com.github.messenger4j.exception.MessengerVerificationException;
import com.github.messenger4j.send.MessagePayload;
import com.github.messenger4j.send.MessagingType;
import com.github.messenger4j.send.message.TemplateMessage;
import com.github.messenger4j.send.message.TextMessage;
import com.github.messenger4j.send.message.template.ButtonTemplate;
import com.github.messenger4j.send.message.template.button.UrlButton;
import com.github.messenger4j.userprofile.UserProfile;
import com.github.messenger4j.webhook.event.TextMessageEvent;
import com.juick.Message;
import com.juick.User;
import com.juick.server.component.MessageEvent;
import com.juick.service.MessagesService;
import com.juick.service.MessengerService;
import com.juick.service.SubscriptionService;
import com.juick.service.UserService;
import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.ApplicationListener;
import org.springframework.stereotype.Component;

import javax.annotation.Nonnull;
import javax.annotation.PostConstruct;
import javax.inject.Inject;
import java.net.MalformedURLException;
import java.net.URI;
import java.net.URL;
import java.time.Instant;
import java.util.Collections;
import java.util.List;
import java.util.Optional;

import static com.juick.formatters.PlainTextFormatter.formatPost;
import static com.juick.formatters.PlainTextFormatter.formatUrl;

@Component
public class MessengerManager implements ApplicationListener<MessageEvent> {
    private static final Logger logger = LoggerFactory.getLogger(MessengerManager.class);
    @Inject
    private MessagesService messagesService;
    @Inject
    private UserService userService;
    @Inject
    private MessengerService messengerService;
    @Inject
    private CommandsManager commandsManager;

    @Value("${fb_page_access_token:12345678}")
    private String facebookPageAccessToken;
    @Value("${fb_verify_token:12345678}")
    private String facebookVerifyToken;
    @Value("${fb_secret:12345678}")
    private String facebookSecret;

    private Messenger messenger;

    @PostConstruct
    public void init() {
        messenger = Messenger.create(facebookPageAccessToken, facebookSecret, facebookVerifyToken);
    }

    public String getFacebookVerifyToken() {
        return facebookVerifyToken;
    }

    public void processUpdate(String signature , String data) throws MessengerVerificationException {
        messenger.onReceiveEvents(data, Optional.of(signature), event -> {
            final String senderId = event.senderId();
            final Instant timestamp = event.timestamp();

            User user_from = userService.getUserByUID(messengerService.getUserId(senderId)).orElse(new User());
            logger.info("Found juick user {}", user_from.getUid());
            if (user_from.getUid() == 0) {
                try {
                    UserProfile profile = messenger.queryUserProfile(senderId);
                    signupNotify(senderId, messengerService.getSignUpHash(senderId, profile.firstName()));
                } catch (MessengerApiException | MessengerIOException | MalformedURLException e) {
                    logger.warn("messenger profile error", e);
                    try {
                        signupNotify(senderId, messengerService.getSignUpHash(senderId, "anonymous"));
                    } catch (MalformedURLException | MessengerApiException | MessengerIOException e1) {
                        logger.warn("signup error", e1);
                    }
                }
            } else {
                if (event.isTextMessageEvent()) {
                    final TextMessageEvent textMessageEvent = event.asTextMessageEvent();
                    final String messageId = textMessageEvent.messageId();
                    final String text = textMessageEvent.text();
                    logger.info("Received text message from '{}' at '{}' with content: {} (mid: {})",
                            senderId, timestamp, text, messageId);
                    try {
                        commandsManager.processCommand(user_from, text, URI.create(StringUtils.EMPTY));
                    } catch (Exception e) {
                        logger.warn("messenger error", e);
                    }
                    messengerNotify(senderId, "Message sent", null);
                }
            }
        });
    }

    @Override
    public void onApplicationEvent(@Nonnull MessageEvent event) {
        Message msg = event.getMessage();
        List<User> subscribedUsers = event.getUsers();
        if (msg.getMid() > 0 && msg.getRid() == 0) {
            String subject = formatPost(msg);
            subscribedUsers
                    .forEach(user -> messengerService.getSenderId(user)
                            .ifPresent(t -> messengerNotify(t, subject, formatUrl(msg))));
        } else if (msg.getRid() > 0) {
            Message op = messagesService.getMessage(msg.getMid());
            String subject = formatPost(msg);
            subscribedUsers
                    .forEach(user -> messengerService.getSenderId(user)
                            .ifPresent(t -> messengerNotify(t, subject, formatUrl(msg))));
        }
    }

    private void messengerNotify(String messengerUser, String text, String url) {
        try {
            if (!StringUtils.isEmpty(url)) {
                final UrlButton showMessage = UrlButton.create("VIEW MESSAGE", new URL(url));
                ButtonTemplate template = ButtonTemplate.create(text, Collections.singletonList(showMessage));
                messenger.send(MessagePayload.create(messengerUser, MessagingType.NON_PROMOTIONAL_SUBSCRIPTION, TemplateMessage.create(template)));
            } else {
                messenger.send(MessagePayload.create(messengerUser, MessagingType.NON_PROMOTIONAL_SUBSCRIPTION, TextMessage.create(text)));
            }
        } catch (MessengerApiException | MessengerIOException | MalformedURLException e) {
            logger.warn("messenger error", e);
        }
    }
    private void signupNotify(String messengerUser, String hash) throws MalformedURLException, MessengerApiException, MessengerIOException {
        final UrlButton urlButton = UrlButton.create("LOGIN",
                new URL("https://juick.com/signup?type=messenger&hash=" + hash));
        ButtonTemplate template = ButtonTemplate.create("Login to receive notifications",
                Collections.singletonList(urlButton));
        messenger.send(MessagePayload.create(messengerUser, MessagingType.RESPONSE, TemplateMessage.create(template)));
    }
}