const vowelLetters = ['a', 'e', 'ê', 'i', 'o', 'ô', 'u', 'y', 'ø'];

const rootEndingPair = (str) => {
  return { root: str.slice(0, -1), ending: str.slice(-1) };
};

function declineSaimiar(entry) {
  const sai = entry.sai;
  const morph = entry.morph_type;
  if (morph == '-V') {
    return vowelDeclension(sai);
  } else if (morph == '-a/i') {
    return aiDeclension(sai)
  } else if (morph == "e-") {
    return initalDeclension(sai);
  } else if (morph == "-C") {
    return consonantDeclension(sai);
  } else {
    console.warn(`Can't decline entry '${entry.sai}'`);
    console.log(entry)
    return null;
  }
}

function vowelDeclension(sai) {
  const { root, ending } = rootEndingPair(sai);
  const adpEnding = ending == "u" ? "ys" : `${ending}s`;

  return {
    "abs": `${root}${ending}`,
    "erg": `${root}${ending}na`,
    "adp": `${root}${adpEnding}`,
    "all": `so${root}${adpEnding}`,
    "loc": `${root}${ending}xa`,
    "ell": `tlê${root}${adpEnding}`,
    "inst": `${root}${ending}ŕa`,
    "rel": `${root}${ending}źi`
  };
}

function aiDeclension(sai) {
  const { root, ending } = rootEndingPair(sai);
  return {
    "abs": `${root}${ending}`,
    "erg": `${root}iad`,
    "adp": `${root}i`,
    "all": `so${root}i`,
    "loc": `${root}iath`,
    "ell": `tlê${root}i`,
    "inst": `${root}iar`,
    "rel": `${root}iai`
  };
}

function consonantDeclension(sai) {
  const split = rootEndingPair(sai);
  const root = split.ending == 'ø' ? split.root : sai;
  const absFinal = split.ending == 'ø' ? 'ø' : '';

  return {
    "abs": `${root}${absFinal}`,
    "erg": `${root}ad`,
    "adp": `${root}e`,
    "all": `so${root}i`,
    "loc": `${root}ak`,
    "ell": `tlê${root}i`,
    "inst": `${root}ar`,
    "rel": `${root}ai`
  };
}

function initalDeclension(sai) {
  const { root, ending } = rootEndingPair(sai);
  return {
    "abs": `${root}${ending}`,
    "erg": `${root}${ending}na`,
    "adp": `${root}${ending}s`,
  };
}

export { declineSaimiar };