import { Lang } from "@scandic-hotels/common/constants/language"
import { ApiLang } from "@scandic-hotels/trpc/constants/apiLang"

export const languages: Record<Lang, string> = {
  [Lang.da]: "Dansk",
  [Lang.de]: "Deutsch",
  [Lang.en]: "English",
  [Lang.fi]: "Suomi",
  [Lang.no]: "Norsk",
  [Lang.sv]: "Svenska",
}

export const localeToLang: Record<string, Lang> = {
  en: Lang.en,
  "en-US": Lang.en,
  "en-GB": Lang.en,
  "en-DE": Lang.en,
  "en-DK": Lang.en,
  "en-SE": Lang.en,
  "en-FI": Lang.en,

  sv: Lang.sv,
  "se-SE": Lang.sv,
  "sv-SE": Lang.sv,
  "sv-FI": Lang.sv,

  fi: Lang.fi,
  "fi-FI": Lang.fi,
  "se-FI": Lang.fi,
  "smn-FI": Lang.fi,

  dk: Lang.da,
  da: Lang.da,
  "da-DK": Lang.da,
  "fo-DK": Lang.da,

  de: Lang.de,
  "de-DE": Lang.de,
  "dsb-DE": Lang.de,
  "ksh-DE": Lang.de,
  "nds-DE": Lang.de,
  "hsb-DE": Lang.de,
  "de-CH": Lang.de,
  "de-AU": Lang.de,

  no: Lang.no,
  nb: Lang.no,
  "nb-NO": Lang.no,
  "nn-NO": Lang.no,
  "se-NO": Lang.no,
} as const

export const languageSelect = [
  { label: "Danish", value: ApiLang.Da },
  { label: "German", value: ApiLang.De },
  { label: "English", value: ApiLang.En },
  { label: "Finnish", value: ApiLang.Fi },
  { label: "Norwegian", value: ApiLang.No },
  { label: "Swedish", value: ApiLang.Sv },
]

/**
 * Get localized language options based on the current lang.
 */
export function getLocalizedLanguageOptions(currentLang: Lang) {
  const displayNames = new Intl.DisplayNames([currentLang], {
    type: "language",
  })

  return languageSelect.map((option) => {
    const localizedName = displayNames.of(option.value)
    const capitalizedName = localizedName
      ? localizedName.charAt(0).toUpperCase() + localizedName.slice(1)
      : option.label

    return {
      value: option.value,
      label: capitalizedName,
    }
  })
}