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 };