import merge from 'lodash.merge'
import UAParser from 'ua-parser-js'
import { v7 as uuidv7 } from 'uuid'

import { WEBCHAT } from '../constants'
import type { ClientUser } from '../webchat/context/types'
import type { WebchatTheme } from '../webchat/theme/types'
import { getCountryFromTimeZone, normalizeLocale } from './i18n'
import { getProperty } from './objects'

/**
 * Returns the value of a property defined in bot's theme based on WEBCHAT.CUSTOM_PROPERTIES dictionary.
 * It gives preference to nested defined properties (e.g.: header.style) over plain properties (e.g.: headerStyle).
 * If property doesn't exist, returns the defaultValue.
 */
export const _getThemeProperty =
  (theme: WebchatTheme) => (property: string, defaultValue?: any) => {
    for (const [key, value] of Object.entries(WEBCHAT.CUSTOM_PROPERTIES)) {
      if (value === property) {
        const nestedProperty = getProperty(theme, value)
        if (nestedProperty !== undefined) {
          return nestedProperty
        }
        const plainProperty = getProperty(theme, key)
        if (plainProperty !== undefined) {
          return plainProperty
        }
        return defaultValue
      }
    }
    return undefined
  }

export const createUser = (): {
  id: string
  name: string
} => {
  const parser = new UAParser()
  const ua = parser.getResult()
  let name = `${ua.os.name} ${ua.browser.name}`
  if (ua.device?.type) {
    name = `${ua.device.type} ${name}`
  }
  return {
    id: uuidv7(),
    name,
  }
}
export const initSession = (
  session: any
): { user: { id: string; name: string } } => {
  if (!session) {
    session = {}
  }
  const hasUserId = session?.user?.id !== undefined
  if (!session.user || Object.keys(session.user).length === 0 || !hasUserId) {
    session.user = !hasUserId ? merge(session.user, createUser()) : createUser()
  }
  return session
}

export function updateUserLocaleAndCountry(user: Partial<ClientUser>) {
  user.locale = getLocale(user)
  user.country = getCountry(user)
  user.system_locale = getSystemLocale(user)

  return user
}

function getLocale(user: Partial<ClientUser>) {
  if (user.locale) {
    return normalizeLocale(user.locale)
  }

  const locale = user.extra_data?.language
    ? (user.extra_data?.language as string)
    : navigator.language

  return normalizeLocale(locale)
}

function getCountry(user: Partial<ClientUser>) {
  if (user.country) {
    return user.country
  }

  return user.extra_data?.country
    ? (user.extra_data?.country as string)
    : getCountryFromTimeZone()
}

function getSystemLocale(user: Partial<ClientUser>) {
  if (user.system_locale) {
    return user.system_locale
  }
  return getLocale(user)
}

export const shouldKeepSessionOnReload = ({
  initialDevSettings,
  devSettings,
}) => !initialDevSettings || devSettings?.keepSessionOnReload

//TODO: Review param serverConfig if is of type ServerConfig this never have errorMessage
export const getServerErrorMessage = serverConfig => {
  if (!serverConfig || !serverConfig.errorMessage) {
    return 'Connection issues'
  }
  if (typeof serverConfig.errorMessage === 'function') {
    return serverConfig.errorMessage()
  }
  return serverConfig.errorMessage
}