const { InvalidArgumentError } = require('@/modules/shared/errors')

/**
 * NOTE: Stop adding stuff to this service, create specialized service modules instead for various domains
 * relating to streams. Otherwise we're not only breaking the single responsibility principle, but also
 * increasing the chances of circular dependencies (which often cause actual errors) since everything relies
 * on this service.
 */

module.exports = {
  /**
   * Get active user stream favorite date (using dataloader)
   * @param {Object} p
   * @param {import('@/modules/shared/index').GraphQLContext} p.ctx
   * @param {string} p.streamId
   * @returns {Promise<string | null>}
   */
  async getActiveUserStreamFavoriteDate({ ctx, streamId }) {
    if (!ctx.userId) {
      return null
    }

    if (!streamId) {
      throw new InvalidArgumentError('Invalid stream ID')
    }

    return (
      (await ctx.loaders.streams.getUserFavoriteData.load(streamId))?.createdAt || null
    )
  },

  /**
   * Get stream favorites count (using dataloader)
   * @param {Object} p
   * @param {import('@/modules/shared/index').GraphQLContext} p.ctx
   * @param {string} p.streamId
   * @returns {Promise<number>}
   */
  async getStreamFavoritesCount({ ctx, streamId }) {
    if (!streamId) {
      throw new InvalidArgumentError('Invalid stream ID')
    }

    return (await ctx.loaders.streams.getFavoritesCount.load(streamId)) || 0
  },

  /**
   * @param {Object} p
   * @param {import('@/modules/shared/index').GraphQLContext} p.ctx
   * @param {string} p.userId
   * @returns {Promise<number>}
   */
  async getOwnedFavoritesCount({ ctx, userId }) {
    if (!userId) {
      throw new InvalidArgumentError('Invalid user ID')
    }

    return (await ctx.loaders.streams.getOwnedFavoritesCount.load(userId)) || 0
  }
}