import {
  ViewName,
  getUsersByAppParams,
  getProdAppID,
  generateAppUserID,
  queryGlobalView,
  UNICODE_MAX,
} from "./db"
import { BulkDocsResponse, User } from "@budibase/types"
import { getGlobalDB } from "./context"
import * as context from "./context"

type GetOpts = { cleanup?: boolean }

function cleanupUsers(users: User | User[]) {
  if (Array.isArray(users)) {
    return users.map(user => {
      delete user.password
      return user
    })
  } else {
    delete users.password
    return users
  }
}

export const bulkGetGlobalUsersById = async (
  userIds: string[],
  opts?: GetOpts
) => {
  const db = getGlobalDB()
  let users = (
    await db.allDocs({
      keys: userIds,
      include_docs: true,
    })
  ).rows.map(row => row.doc) as User[]
  if (opts?.cleanup) {
    users = cleanupUsers(users) as User[]
  }
  return users
}

export const bulkUpdateGlobalUsers = async (users: User[]) => {
  const db = getGlobalDB()
  return (await db.bulkDocs(users)) as BulkDocsResponse
}

export async function getById(id: string, opts?: GetOpts): Promise<User> {
  const db = context.getGlobalDB()
  let user = await db.get(id)
  if (opts?.cleanup) {
    user = cleanupUsers(user)
  }
  return user
}

/**
 * Given an email address this will use a view to search through
 * all the users to find one with this email address.
 * @param {string} email the email to lookup the user by.
 */
export const getGlobalUserByEmail = async (
  email: String,
  opts?: GetOpts
): Promise<User | undefined> => {
  if (email == null) {
    throw "Must supply an email address to view"
  }

  const response = await queryGlobalView<User>(ViewName.USER_BY_EMAIL, {
    key: email.toLowerCase(),
    include_docs: true,
  })

  if (Array.isArray(response)) {
    // shouldn't be able to happen, but need to handle just in case
    throw new Error(`Multiple users found with email address: ${email}`)
  }

  let user = response as User
  if (opts?.cleanup) {
    user = cleanupUsers(user) as User
  }

  return user
}

export const searchGlobalUsersByApp = async (
  appId: any,
  opts: any,
  getOpts?: GetOpts
) => {
  if (typeof appId !== "string") {
    throw new Error("Must provide a string based app ID")
  }
  const params = getUsersByAppParams(appId, {
    include_docs: true,
  })
  params.startkey = opts && opts.startkey ? opts.startkey : params.startkey
  let response = await queryGlobalView(ViewName.USER_BY_APP, params)
  if (!response) {
    response = []
  }
  let users: User[] = Array.isArray(response) ? response : [response]
  if (getOpts?.cleanup) {
    users = cleanupUsers(users) as User[]
  }
  return users
}

export const getGlobalUserByAppPage = (appId: string, user: User) => {
  if (!user) {
    return
  }
  return generateAppUserID(getProdAppID(appId)!, user._id!)
}

/**
 * Performs a starts with search on the global email view.
 */
export const searchGlobalUsersByEmail = async (
  email: string,
  opts: any,
  getOpts?: GetOpts
) => {
  if (typeof email !== "string") {
    throw new Error("Must provide a string to search by")
  }
  const lcEmail = email.toLowerCase()
  // handle if passing up startkey for pagination
  const startkey = opts && opts.startkey ? opts.startkey : lcEmail
  let response = await queryGlobalView<User>(ViewName.USER_BY_EMAIL, {
    ...opts,
    startkey,
    endkey: `${lcEmail}${UNICODE_MAX}`,
  })
  if (!response) {
    response = []
  }
  let users: User[] = Array.isArray(response) ? response : [response]
  if (getOpts?.cleanup) {
    users = cleanupUsers(users) as User[]
  }
  return users
}