'use strict'
const crs = require('crypto-random-string')
const knex = require('@/db/knex')

const Streams = () => knex('streams')
const Commits = () => knex('commits')
const StreamCommits = () => knex('stream_commits')
const BranchCommits = () => knex('branch_commits')

const { getBranchByNameAndStreamId } = require('./branches')
const { getObject } = require('./objects')

module.exports = {
  async createCommitByBranchId({
    streamId,
    branchId,
    objectId,
    authorId,
    message,
    sourceApplication,
    totalChildrenCount,
    parents
  }) {
    // If no total children count is passed in, get it from the original object
    // that this commit references.
    if (!totalChildrenCount) {
      const { totalChildrenCount: tc } = await getObject({ streamId, objectId })
      totalChildrenCount = tc || 1
    }

    // Create main table entry
    const [{ id }] = await Commits()
      .returning('id')
      .insert({
        id: crs({ length: 10 }),
        referencedObject: objectId,
        author: authorId,
        sourceApplication,
        totalChildrenCount,
        parents,
        message
      })

    // Link it to a branch
    await BranchCommits().insert({ branchId, commitId: id })
    // Link it to a stream
    await StreamCommits().insert({ streamId, commitId: id })

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

  async createCommitByBranchName({
    streamId,
    branchName,
    objectId,
    authorId,
    message,
    sourceApplication,
    totalChildrenCount,
    parents
  }) {
    branchName = branchName.toLowerCase()
    const myBranch = await getBranchByNameAndStreamId({ streamId, name: branchName })

    if (!myBranch) throw new Error(`Failed to find branch with name ${branchName}.`)

    return await module.exports.createCommitByBranchId({
      streamId,
      branchId: myBranch.id,
      objectId,
      authorId,
      message,
      sourceApplication,
      totalChildrenCount,
      parents
    })
  },

  async updateCommit({ streamId, id, message, newBranchName }) {
    if (newBranchName) {
      try {
        const newBranch = await getBranchByNameAndStreamId({
          streamId,
          name: newBranchName
        })
        const { branchName: oldBranchName } = await module.exports.getCommitById({
          streamId,
          id
        })
        const oldBranch = await getBranchByNameAndStreamId({
          streamId,
          name: oldBranchName
        })

        await BranchCommits()
          .where({ branchId: oldBranch.id, commitId: id })
          .update({ branchId: newBranch.id })
      } catch (e) {
        throw new Error('Failed to update commit branch. ')
      }
    }
    if (message) await Commits().where({ id }).update({ message })
    return true
  },

  async getCommitById({ streamId, id }) {
    const query = await Commits()
      .columns([
        { id: 'commits.id' },
        'message',
        'referencedObject',
        'sourceApplication',
        'totalChildrenCount',
        'parents',
        'commits.createdAt',
        { branchName: 'branches.name' },
        { authorName: 'users.name' },
        { authorId: 'users.id' },
        { authorAvatar: 'users.avatar' }
      ])
      .select()
      .join('stream_commits', 'commits.id', 'stream_commits.commitId')
      .join('branch_commits', 'commits.id', 'branch_commits.commitId')
      .join('branches', 'branches.id', 'branch_commits.branchId')
      .leftJoin('users', 'commits.author', 'users.id')
      .where({ 'stream_commits.streamId': streamId, 'commits.id': id })
      .first()
    return await query
  },

  async deleteCommit({ id }) {
    return await Commits().where({ id }).del()
  },

  async getCommitsTotalCountByBranchId({ branchId }) {
    const [res] = await BranchCommits().count().where('branchId', branchId)

    return parseInt(res.count)
  },

  async getCommitsTotalCountByBranchName({ streamId, branchName }) {
    branchName = branchName.toLowerCase()
    const myBranch = await getBranchByNameAndStreamId({
      streamId,
      name: branchName
    })

    if (!myBranch) throw new Error(`Failed to find branch with name ${branchName}.`)

    return module.exports.getCommitsTotalCountByBranchId({ branchId: myBranch.id })
  },

  async getCommitsByBranchId({ branchId, limit, cursor }) {
    limit = limit || 25
    const query = BranchCommits()
      .columns([
        { id: 'commitId' },
        'message',
        'referencedObject',
        'sourceApplication',
        'totalChildrenCount',
        'parents',
        'commits.createdAt',
        { branchName: 'branches.name' },
        { authorName: 'users.name' },
        { authorId: 'users.id' },
        { authorAvatar: 'users.avatar' }
      ])
      .select()
      .join('commits', 'commits.id', 'branch_commits.commitId')
      .join('branches', 'branches.id', 'branch_commits.branchId')
      .leftJoin('users', 'commits.author', 'users.id')
      .where('branchId', branchId)

    if (cursor) query.andWhere('commits.createdAt', '<', cursor)

    query.orderBy('commits.createdAt', 'desc').limit(limit)

    const rows = await query

    return {
      commits: rows,
      cursor: rows.length > 0 ? rows[rows.length - 1].createdAt.toISOString() : null
    }
  },

  async getCommitsByBranchName({ streamId, branchName, limit, cursor }) {
    branchName = branchName.toLowerCase()
    const myBranch = await getBranchByNameAndStreamId({
      streamId,
      name: branchName
    })

    if (!myBranch) throw new Error(`Failed to find branch with name ${branchName}.`)

    return module.exports.getCommitsByBranchId({ branchId: myBranch.id, limit, cursor })
  },

  async getCommitsTotalCountByStreamId({ streamId, ignoreGlobalsBranch }) {
    const query = StreamCommits()
      .count()
      .join('branch_commits', 'stream_commits.commitId', 'branch_commits.commitId')
      .join('branches', 'branches.id', 'branch_commits.branchId')
      .where('stream_commits.streamId', streamId)

    if (ignoreGlobalsBranch) query.andWhere('branches.name', '!=', 'globals')

    // let [ res ] = await StreamCommits( ).count( ).where( 'streamId', streamId )
    const [res] = await query
    return parseInt(res.count)
  },

  async getCommitsByStreamId({ streamId, limit, cursor, ignoreGlobalsBranch }) {
    limit = limit || 25
    const query = StreamCommits()
      .columns([
        { id: 'commits.id' },
        'message',
        'referencedObject',
        'sourceApplication',
        'totalChildrenCount',
        'parents',
        'commits.createdAt',
        { branchName: 'branches.name' },
        { authorName: 'users.name' },
        { authorId: 'users.id' },
        { authorAvatar: 'users.avatar' }
      ])
      .select()
      .join('commits', 'commits.id', 'stream_commits.commitId')
      .join('branch_commits', 'commits.id', 'branch_commits.commitId')
      .join('branches', 'branches.id', 'branch_commits.branchId')
      .leftJoin('users', 'commits.author', 'users.id')
      .where('stream_commits.streamId', streamId)

    if (ignoreGlobalsBranch) query.andWhere('branches.name', '!=', 'globals')

    if (cursor) query.andWhere('commits.createdAt', '<', cursor)

    query.orderBy('commits.createdAt', 'desc').limit(limit)

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

  async getCommitsByUserId({ userId, limit, cursor, publicOnly }) {
    limit = limit || 25
    publicOnly = publicOnly !== false

    const query = Commits()
      .columns([
        { id: 'commits.id' },
        'message',
        'referencedObject',
        'sourceApplication',
        'totalChildrenCount',
        'parents',
        'commits.createdAt',
        { branchName: 'branches.name' },
        { streamId: 'stream_commits.streamId' },
        { streamName: 'streams.name' }
      ])
      .select()
      .join('stream_commits', 'commits.id', 'stream_commits.commitId')
      .join('streams', 'stream_commits.streamId', 'streams.id')
      .join('branch_commits', 'commits.id', 'branch_commits.commitId')
      .join('branches', 'branches.id', 'branch_commits.branchId')
      .where('author', userId)

    if (publicOnly) query.andWhere('streams.isPublic', true)

    if (cursor) query.andWhere('commits.createdAt', '<', cursor)

    query.orderBy('commits.createdAt', 'desc').limit(limit)

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

  async getCommitsTotalCountByUserId({ userId }) {
    const [res] = await Commits().count().where('author', userId)
    return parseInt(res.count)
  }
}