export enum ReviewMode {
    GER_TO_LAT,
    LAT_TO_GER,
};

export enum VocabType {
    NOMEN,
    VERB,
    ADJEKTIV,
    ADVERB
};

export interface INomenData {
    grundform: string;
    genitiv: string;
    genus: string;
};

export interface IVerbData {
    grundform: string;
    // 1. Person
    praesens: string;
    perfekt: string;
    ppp: string;
};

export interface IAdjektivData {
    grundform: string;
    nominativ_a: string;
    nominativ_b: string;
};

export interface IVocab {
    // If a word has multiple meanings
    german: string[];
    hint?: string;
    mnemonic?: string;

    type: VocabType;
    latin: INomenData | IVerbData | IAdjektivData;

    // This number is unique across all vocabulary items
    id: number;
};

// What kind of question should be answered
export enum ReviewQType {
    GERMAN,

    NOMEN_GENITIV,
    NOMEN_GENUS,

    ADJ_NOM_A,
    ADJ_NOM_B,

    VERB_PRAESENS,
    VERB_PERFEKT,
    VERB_PPP
};

export interface IReviewCard {
    question: string;
    // If a question can have multiple answers
    answers: string[];

    qtype: ReviewQType;

    // Identical to its corresponding IVocab item
    id: number;
};

export function reviewQTypeToStr(type: ReviewQType): string {
    switch (type) {
        case ReviewQType.GERMAN:
            return "Übersetzung";
        case ReviewQType.NOMEN_GENITIV:
            return "Genitiv";
        case ReviewQType.NOMEN_GENUS:
            return "Genus";
        case ReviewQType.ADJ_NOM_A:
            // TODO
            return "Nominativ A";
        case ReviewQType.ADJ_NOM_B:
            // TODO
            return "Nominativ B";
        case ReviewQType.VERB_PRAESENS:
            return "1. Person Präsens";
        case ReviewQType.VERB_PERFEKT:
            return "1. Person Perfekt";
        case ReviewQType.VERB_PPP:
            // TODO
            return "PPP";
    }
}

// Turn a vocabulaty item into a series of questions about the item
export function vocabToReviewCard(vocab: IVocab): IReviewCard[] {
    switch (vocab.type) {
        case VocabType.NOMEN:
            const latin = vocab.latin as INomenData;
            return [{
                // Latin -> German
                question: latin.grundform,
                answers: vocab.german,
                qtype: ReviewQType.GERMAN,
                id: vocab.id,
            }, {
                // Latin -> Genitiv
                question: latin.grundform,
                answers: [latin.genitiv],
                qtype: ReviewQType.NOMEN_GENITIV,
                id: vocab.id,
            }, {
                // Latin -> Genus
                question: latin.grundform,
                answers: [latin.genus],
                qtype: ReviewQType.NOMEN_GENUS,
                id: vocab.id,
            }];
        default:
            return [];
    }
}

export function typeToPoints(type: VocabType) {
    switch (type) {
        // Nomen: 2P + 1 (Wenn richtig)
        // 
    }
};