package cc.fascinated.bat.features.reminder;

import cc.fascinated.bat.common.Serializable;
import cc.fascinated.bat.service.DiscordService;
import com.google.gson.Gson;
import lombok.Getter;
import net.dv8tion.jda.api.entities.User;
import net.dv8tion.jda.api.entities.channel.concrete.TextChannel;
import org.bson.Document;

import java.util.*;

/**
 * @author Fascinated (fascinated7)
 */
@Getter
public class ReminderProfile extends Serializable {
    /**
     * The reminders in the guild
     */
    private final Map<User, List<Reminder>> reminders = new HashMap<>();

    /*
     * Get the amount of reminders a user has
     *
     * @param user The user to get the reminders for
     * @return The amount of reminders the user has
     */
    public int getReminderCount(User user) {
        List<Reminder> reminderList = reminders.get(user);
        return reminderList == null ? 0 : reminderList.size();
    }

    /*
     * Remove all reminders for a user
     *
     * @param user The user to remove the reminders for
     */
    public void removeReminders(User user) {
        reminders.remove(user);
    }

    /*
     * Check if a user has reminders
     *
     * @param user The user to check for
     * @return If the user has reminders
     */
    public boolean hasReminders(User user) {
        return reminders.containsKey(user);
    }

    /*
     * Get the reminders for a user
     *
     * @param user The user to get the reminders for
     * @return The reminders for the user
     */
    public List<Reminder> getReminders(User user) {
        return reminders.get(user);
    }

    /*
     * Add a reminder for a user
     *
     * @param user The user to add the reminder for
     * @param reminder The reminder to add
     */
    public Reminder addReminder(User user, TextChannel channel, String reason, Date endDate) {
        List<Reminder> reminderList = reminders.get(user);
        if (reminderList == null) {
            reminderList = new ArrayList<>();
        }
        Reminder reminder = new Reminder(reason, channel.getId(), endDate);
        reminderList.add(reminder);
        reminders.put(user, reminderList);
        return reminder;
    }

    /*
     * Remove a reminder for a user
     *
     * @param user The user to remove the reminder for
     * @param reminder The reminder to remove
     */
    public void removeReminder(User user, Reminder reminder) {
        List<Reminder> reminderList = reminders.get(user);
        if (reminderList == null) {
            return;
        }
        reminderList.remove(reminder);
        reminders.put(user, reminderList);

        if (reminderList.isEmpty()) {
            reminders.remove(user);
        }
    }

    @Override
    public void load(Document document, Gson gson) {
        for (String key : document.keySet()) {
            User user = DiscordService.JDA.getUserById(key);
            if (user == null) {
                continue;
            }
            List<Reminder> reminderList = new ArrayList<>();
            for (Document reminderDocument : document.getList(key, Document.class)) {
                reminderList.add(new Reminder(
                        reminderDocument.getString("reminder"),
                        reminderDocument.getString("channelId"),
                        reminderDocument.getDate("endDate")
                ));
            }
            reminders.put(user, reminderList);
        }
    }

    @Override
    public Document serialize(Gson gson) {
        Document document = new Document();
        for (Map.Entry<User, List<Reminder>> entry : reminders.entrySet()) {
            List<Document> reminderDocuments = new ArrayList<>();
            List<Reminder> value = entry.getValue();
            if (value == null || value.isEmpty()) {
                continue;
            }
            for (Reminder reminder : value) {
                Document reminderDocument = new Document();
                reminderDocument.append("reminder", reminder.getReminder());
                reminderDocument.append("channelId", reminder.getChannelId());
                reminderDocument.append("endDate", reminder.getEndDate());
                reminderDocuments.add(reminderDocument);
            }
            document.append(entry.getKey().getId(), reminderDocuments);
        }
        return document;
    }

    @Override
    public void reset() {
        reminders.clear();
    }
}