export enum Lang {
  en = "en",
  sv = "sv",
  no = "no",
  fi = "fi",
  da = "da",
  de = "de",
}

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: "Da" },
  { label: "German", value: "De" },
  { label: "English", value: "En" },
  { label: "Finnish", value: "Fi" },
  { label: "Norwegian", value: "No" },
  { label: "Swedish", value: "Sv" },
]

// -- Lang util functions --

export function findLang(pathname: string) {
  return Object.values(Lang).find(
    (l) => pathname.startsWith(`/${l}/`) || pathname === `/${l}`
  )
}

/**
 * Helper function to convert API's (e.g. the Hotel endpoint) capitalized values to Lang enum.
 */
export function fromUppercaseToLangEnum(lang: string): Lang | undefined {
  const lowerCaseLang = lang.toLowerCase()
  return Object.values(Lang).find((l) => l === lowerCaseLang)
}

/**
 * Helper function to convert Lang enum to uppercase
 * Needed for certtain API (e.g. the Hotel endpoint).
 */
export const toUppercaseLang = (lang: Lang): string => {
  switch (lang) {
    case Lang.en:
      return "En"
    case Lang.sv:
      return "Sv"
    case Lang.no:
      return "No"
    case Lang.fi:
      return "Fi"
    case Lang.da:
      return "Da"
    case Lang.de:
      return "De"
    default:
      throw new Error("Invalid language")
  }
}