import { getClientLocale } from './includes/utils'
import { ConfigureOptions } from './types'
import { $locale } from './stores/locale'

interface Formats {
  number: Record<string, any>
  date: Record<string, any>
  time: Record<string, any>
}

interface Options {
  fallbackLocale: string
  initialLocale: string
  formats: Formats
  loadingDelay: number
}

export const defaultFormats: Formats = {
  number: {
    scientific: { notation: 'scientific' },
    engineering: { notation: 'engineering' },
    compactLong: { notation: 'compact', compactDisplay: 'long' },
    compactShort: { notation: 'compact', compactDisplay: 'short' },
  },
  date: {
    short: { month: 'numeric', day: 'numeric', year: '2-digit' },
    medium: { month: 'short', day: 'numeric', year: 'numeric' },
    long: { month: 'long', day: 'numeric', year: 'numeric' },
    full: { weekday: 'long', month: 'long', day: 'numeric', year: 'numeric' },
  },
  time: {
    short: { hour: 'numeric', minute: 'numeric' },
    medium: { hour: 'numeric', minute: 'numeric', second: 'numeric' },
    long: {
      hour: 'numeric',
      minute: 'numeric',
      second: 'numeric',
      timeZoneName: 'short',
    },
    full: {
      hour: 'numeric',
      minute: 'numeric',
      second: 'numeric',
      timeZoneName: 'short',
    },
  },
}

export const defaultOptions: Options = {
  fallbackLocale: null,
  initialLocale: null,
  loadingDelay: 200,
  formats: defaultFormats,
}

const options: Options = defaultOptions

export function getOptions() {
  return options
}

export function init(opts: ConfigureOptions) {
  const fallbackLocale = (options.fallbackLocale = opts.fallbackLocale)

  const initialLocale = opts.initialLocale
    ? typeof opts.initialLocale === 'string'
      ? opts.initialLocale
      : getClientLocale(opts.initialLocale) || fallbackLocale
    : fallbackLocale

  $locale.set(initialLocale)
  options.initialLocale = initialLocale

  if (opts.formats) {
    if ('number' in opts.formats) {
      Object.assign(options.formats.number, opts.formats.number)
    }
    if ('date' in opts.formats) {
      Object.assign(options.formats.date, opts.formats.date)
    }
    if ('time' in opts.formats) {
      Object.assign(options.formats.time, opts.formats.time)
    }
  }

  if (opts.loadingDelay != null) {
    options.loadingDelay = opts.loadingDelay
  }
}