'use strict'
const _ = require('lodash')
const crs = require('crypto-random-string')
const debug = require('debug')

const { createBranch } = require('@/modules/core/services/branches')
const { Streams, StreamAcl, knex } = require('@/modules/core/dbSchema')
const {
  BASE_STREAM_COLUMNS,
  getStream,
  getFavoritedStreams,
  getFavoritedStreamsCount,
  setStreamFavorited,
  canUserFavoriteStream
} = require('@/modules/core/repositories/streams')
const { UnauthorizedError, InvalidArgumentError } = require('@/modules/shared/errors')
const { StreamAccessUpdateError } = require('@/modules/core/errors/stream')
const {
  inviteUsersToStream
} = require('@/modules/serverinvites/services/inviteCreationService')

/**
 * Get base query for finding or counting user streams
 * @param {object} p
 * @param {string} [p.searchQuery] Filter by name/description/id
 * @param {boolean} [p.publicOnly] Whether to only look for public streams
 * @param {string} p.userId The user's ID
 */
function getUserStreamsQueryBase({ userId, publicOnly, searchQuery }) {
  const query = StreamAcl.knex()
    .where(StreamAcl.col.userId, userId)
    .join(Streams.name, StreamAcl.col.resourceId, Streams.col.id)

  if (publicOnly) query.andWhere(Streams.col.isPublic, true)

  if (searchQuery)
    query.andWhere(function () {
      this.where(Streams.col.name, 'ILIKE', `%${searchQuery}%`)
        .orWhere(Streams.col.description, 'ILIKE', `%${searchQuery}%`)
        .orWhere(Streams.col.id, 'ILIKE', `%${searchQuery}%`) //potentially useless?
    })

  return query
}

module.exports = {
  /**
   * @param {{
   *  name?: string,
   *  description?: string,
   *  isPublic?: boolean,
   *  ownerId: string,
   *  withContributors?: string[]
   * }} param0
   * @returns
   */
  async createStream({ name, description, isPublic, ownerId, withContributors }) {
    const stream = {
      id: crs({ length: 10 }),
      name: name || generateStreamName(),
      description: description || '',
      isPublic: isPublic !== false,
      updatedAt: knex.fn.now()
    }

    // Create the stream & set up permissions
    const [{ id: streamId }] = await Streams.knex().returning('id').insert(stream)
    await StreamAcl.knex().insert({
      userId: ownerId,
      resourceId: streamId,
      role: 'stream:owner'
    })

    // Create a default main branch
    await createBranch({
      name: 'main',
      description: 'default branch',
      streamId,
      authorId: ownerId
    })

    // Invite contributors?
    if (withContributors && withContributors.length) {
      await inviteUsersToStream(ownerId, streamId, withContributors)
    }

    return streamId
  },

  getStream,

  async updateStream({ streamId, name, description, isPublic, allowPublicComments }) {
    const [{ id }] = await Streams.knex()
      .returning('id')
      .where({ id: streamId })
      .update({
        name,
        description,
        isPublic,
        allowPublicComments,
        updatedAt: knex.fn.now()
      })
    return id
  },

  setStreamFavorited,

  async grantPermissionsStream({ streamId, userId, role }) {
    // upserts the existing role (sets a new one!)
    // TODO: check if we're removing the last owner (ie, does the stream still have an owner after this operation)?
    const query =
      StreamAcl.knex().insert({ userId, resourceId: streamId, role }).toString() +
      ' on conflict on constraint stream_acl_pkey do update set role=excluded.role'

    await knex.raw(query)

    // update stream updated at
    await Streams.knex().where({ id: streamId }).update({ updatedAt: knex.fn.now() })
    return true
  },

  async revokePermissionsStream({ streamId, userId }) {
    const [streamAclEntriesCount] = await StreamAcl.knex()
      // let [streamAclEntriesCount] = await StreamAcl.knex()
      .where({ resourceId: streamId })
      .count()
    // TODO: check if streamAclEntriesCount === 1 then throw big boo-boo (can't delete last ownership link)

    if (parseInt(streamAclEntriesCount.count) === 1)
      throw new StreamAccessUpdateError(
        'Stream has only one ownership link left - cannot revoke permissions.',
        { info: { streamId, userId } }
      )

    // TODO: below behaviour not correct. Flow:
    // Count owners
    // If owner count > 1, then proceed to delete, otherwise throw an error (can't delete last owner - delete stream)

    const aclEntry = await StreamAcl.knex()
      .where({ resourceId: streamId, userId })
      .select('*')
      .first()

    if (aclEntry.role === 'stream:owner') {
      const ownersCount = StreamAcl.knex().count({
        resourceId: streamId,
        role: 'stream:owner'
      })
      if (ownersCount === 1)
        throw new StreamAccessUpdateError(
          'Could not revoke permissions for last admin',
          {
            info: { streamId, userId }
          }
        )
      else {
        await StreamAcl.knex().where({ resourceId: streamId, userId }).del()
        return true
      }
    }

    const delCount = await StreamAcl.knex()
      .where({ resourceId: streamId, userId })
      .del()

    if (delCount === 0)
      throw new StreamAccessUpdateError('Could not revoke permissions for user', {
        info: { streamId, userId }
      })

    // update stream updated at
    await Streams.knex().where({ id: streamId }).update({ updatedAt: knex.fn.now() })

    return true
  },

  async deleteStream({ streamId }) {
    debug('speckle:db')('Deleting stream ' + streamId)

    // Delete stream commits (not automatically cascaded)
    await knex.raw(
      `
      DELETE FROM commits WHERE id IN (
        SELECT sc."commitId" FROM streams s
        INNER JOIN stream_commits sc ON s.id = sc."streamId"
        WHERE s.id = ?
      )
      `,
      [streamId]
    )
    return await Streams.knex().where({ id: streamId }).del()
  },

  /**
   * Get the streams the user has access to
   * @param {object} p
   * @param {string} p.searchQuery Filter by name/description/id
   * @param {boolean} p.publicOnly Whether to only look for public streams
   * @param {string} p.userId The user's ID
   * @param {number} p.limit Max amount of items to return
   * @param {string} p.cursor Timestamp after which to look for items
   * @returns {{streams: Array, cursor: string|null}}
   */
  async getUserStreams({ userId, limit, cursor, publicOnly, searchQuery }) {
    const finalLimit = limit || 25
    const isPublicOnly = publicOnly !== false //defaults to true if not provided

    const query = getUserStreamsQueryBase({
      userId,
      publicOnly: isPublicOnly,
      searchQuery
    })
    query.columns(BASE_STREAM_COLUMNS).select()

    if (cursor) query.andWhere(Streams.col.updatedAt, '<', cursor)

    query.orderBy(Streams.col.updatedAt, 'desc').limit(finalLimit)

    const rows = await query
    return {
      streams: rows,
      cursor: rows.length > 0 ? rows[rows.length - 1].updatedAt.toISOString() : null
    }
  },

  async getStreams({ offset, limit, orderBy, visibility, searchQuery }) {
    const query = knex
      .column(
        'streams.*',
        knex.raw('coalesce(sum(pg_column_size(objects.data)),0) as size')
      )
      .select()
      .from('streams')
      .leftJoin('objects', 'streams.id', 'objects.streamId')
      .groupBy('streams.id')

    const countQuery = Streams.knex()

    if (searchQuery) {
      const whereFunc = function () {
        this.where('streams.name', 'ILIKE', `%${searchQuery}%`).orWhere(
          'streams.description',
          'ILIKE',
          `%${searchQuery}%`
        )
      }
      query.where(whereFunc)
      countQuery.where(whereFunc)
    }
    if (visibility && visibility !== 'all') {
      if (!['private', 'public'].includes(visibility))
        throw new Error('Stream visibility should be either private, public or all')
      const isPublic = visibility === 'public'
      const publicFunc = function () {
        this.where({ isPublic })
      }
      query.andWhere(publicFunc)
      countQuery.andWhere(publicFunc)
    }
    const [res] = await countQuery.count()
    const count = parseInt(res.count)

    if (!count) return { streams: [], totalCount: 0 }

    orderBy = orderBy || 'updatedAt,desc'

    const [columnName, order] = orderBy.split(',')

    const rows = await query.orderBy(`${columnName}`, order).offset(offset).limit(limit)

    return { streams: rows, totalCount: count }
  },

  /**
   * Get the total amount of streams the user has access to
   * @param {object} p
   * @param {string} p.searchQuery Filter by name/description/id
   * @param {boolean} p.publicOnly Whether to only look for public streams
   * @param {string} p.userId The user's ID
   */
  async getUserStreamsCount({ userId, publicOnly, searchQuery }) {
    const isPublicOnly = publicOnly !== false //defaults to true if not provided

    const query = getUserStreamsQueryBase({
      userId,
      publicOnly: isPublicOnly,
      searchQuery
    })
    query.count()

    const [res] = await query
    return parseInt(res.count)
  },

  async getStreamUsers({ streamId }) {
    const query = StreamAcl.knex()
      .columns({ role: 'stream_acl.role' }, 'id', 'name', 'company', 'avatar')
      .select()
      .where({ resourceId: streamId })
      .rightJoin('users', { 'users.id': 'stream_acl.userId' })
      .select('stream_acl.role', 'name', 'id', 'company', 'avatar')
      .orderBy('stream_acl.role')

    return await query
  },

  /**
   * Favorite or unfavorite a stream
   * @param {Object} p
   * @param {string} p.userId
   * @param {string} p.streamId
   * @param {boolean} [p.favorited] Whether to favorite or unfavorite (true by default)
   * @returns {Promise<Object>} Updated stream
   */
  async favoriteStream({ userId, streamId, favorited }) {
    // Check if user has access to stream
    if (!(await canUserFavoriteStream({ userId, streamId }))) {
      throw new UnauthorizedError("User doesn't have access to the specified stream", {
        info: { userId, streamId }
      })
    }

    // Favorite/unfavorite the stream
    await setStreamFavorited({ streamId, userId, favorited })

    // Get updated stream info
    return await getStream({ streamId, userId })
  },

  /**
   * Get user favorited streams & metadata
   * @param {Object} p
   * @param {string} p.userId
   * @param {number} [p.limit] Defaults to 25
   * @param {string} [p.cursor] Optionally specify date after which to look for favorites
   * @returns
   */
  async getFavoriteStreamsCollection({ userId, limit, cursor }) {
    limit = _.clamp(limit || 25, 1, 25)

    // Get total count of favorited streams
    const totalCount = await getFavoritedStreamsCount(userId)

    // Get paginated streams
    const { cursor: finalCursor, streams } = await getFavoritedStreams({
      userId,
      cursor,
      limit
    })

    return { totalCount, cursor: finalCursor, items: streams }
  },

  /**
   * Get active user stream favorite date (using dataloader)
   * @param {Object} p
   * @param {import('@/modules/shared/index').GraphQLContext} p.ctx
   * @param {string} p.streamId
   * @param {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
  }
}

const adjectives = [
  'Tall',
  'Curved',
  'Stacked',
  'Purple',
  'Pink',
  'Rectangular',
  'Circular',
  'Oval',
  'Shiny',
  'Speckled',
  'Blue',
  'Stretched',
  'Round',
  'Spherical',
  'Majestic',
  'Symmetrical'
]

const nouns = [
  'Building',
  'House',
  'Treehouse',
  'Tower',
  'Tunnel',
  'Bridge',
  'Pyramid',
  'Structure',
  'Edifice',
  'Palace',
  'Castle',
  'Villa'
]

const generateStreamName = () => {
  return `${adjectives[Math.floor(Math.random() * adjectives.length)]} ${
    nouns[Math.floor(Math.random() * nouns.length)]
  }`
}