const crypto = require('crypto');
const { getMessages } = require('./Message');
const SharedLink = require('./schema/shareSchema');
const logger = require('~/config/winston');

module.exports = {
  SharedLink,
  getSharedMessages: async (shareId) => {
    try {
      const share = await SharedLink.findOne({ shareId })
        .populate({
          path: 'messages',
          select: '-_id -__v -user',
        })
        .select('-_id -__v -user')
        .lean();

      if (!share || !share.conversationId || !share.isPublic) {
        return null;
      }

      return share;
    } catch (error) {
      logger.error('[getShare] Error getting share link', error);
      return { message: 'Error getting share link' };
    }
  },

  getSharedLinks: async (user, pageNumber = 1, pageSize = 25, isPublic = true) => {
    const query = { user, isPublic };
    try {
      const totalConvos = (await SharedLink.countDocuments(query)) || 1;
      const totalPages = Math.ceil(totalConvos / pageSize);
      const shares = await SharedLink.find(query)
        .sort({ updatedAt: -1 })
        .skip((pageNumber - 1) * pageSize)
        .limit(pageSize)
        .select('-_id -__v -user')
        .lean();

      return { sharedLinks: shares, pages: totalPages, pageNumber, pageSize };
    } catch (error) {
      logger.error('[getShareByPage] Error getting shares', error);
      return { message: 'Error getting shares' };
    }
  },

  createSharedLink: async (user, { conversationId, ...shareData }) => {
    const share = await SharedLink.findOne({ conversationId }).select('-_id -__v -user').lean();
    if (share) {
      return share;
    }

    try {
      const shareId = crypto.randomUUID();
      const messages = await getMessages({ conversationId });
      const update = { ...shareData, shareId, messages, user };
      return await SharedLink.findOneAndUpdate({ conversationId: conversationId, user }, update, {
        new: true,
        upsert: true,
      });
    } catch (error) {
      logger.error('[saveShareMessage] Error saving conversation', error);
      return { message: 'Error saving conversation' };
    }
  },

  updateSharedLink: async (user, { conversationId, ...shareData }) => {
    const share = await SharedLink.findOne({ conversationId }).select('-_id -__v -user').lean();
    if (!share) {
      return { message: 'Share not found' };
    }
    // update messages to the latest
    const messages = await getMessages({ conversationId });
    const update = { ...shareData, messages, user };
    return await SharedLink.findOneAndUpdate({ conversationId: conversationId, user }, update, {
      new: true,
      upsert: false,
    });
  },

  deleteSharedLink: async (user, { shareId }) => {
    const share = await SharedLink.findOne({ shareId, user });
    if (!share) {
      return { message: 'Share not found' };
    }
    return await SharedLink.findOneAndDelete({ shareId, user });
  },
};