class ManifestMetadata {
    papyrus = '';
    author = '';
    title = '';
    edition = '';
    technique = '';
    pca = null;
    date = '';
    imageAuthor = '';
    license = 'CC BY-NC-ND 4.0';
    copyright = "Ministero della Cultura (Biblioteca Nazionale 'Vittorio Emanuele III' di Napoli)/CNR-Istituto di Scienze del Patrimonio Culturale";

    /**
     * @todo Maybe this doesn't make any sense??
     * @param {
     *         {papyrus,
     *          author,
     *          title,
     *          edition,
     *          technique,
     *          pca,
     *          date,
     *          imageAuthor,
     *          license,
     *          copyright}
     *        } metadata 
     */
    constructor(metadata) {
        this.papyrus = metadata.papyrus ?? this.papyrus;
        this.author = metadata.author ?? this.author;
        this.title = metadata.title ?? this.title;
        this.edition = metadata.edition ?? this.edition;
        // There should always be a technique value
        // in the metadata param
        this.technique = metadata.technique;
        this.pca = metadata.pca ?? this.pca;
        this.date = metadata.date ?? this.date;
        this.imageAuthor = metadata.imageAuthor ?? this.imageAuthor
        this.license = metadata.license ?? this.license;
        this.copyright = metadata.copyright ?? this.copyright;
    }

    /**
     * Returns an array of `label, value`
     * pairs for all metadata
     * @returns {Array<{label, value}>}
     */
    toObject() {
        let metadataObj = [
            {label:"Papyrus", value: this.papyrus},
            {label:"Author", value: this.author},
            {label:"Title", value: this.title},
            {label:"Reference edition", value: this.edition},
            {label:"Technique", value: this.technique},
        ];

        if (this.pca) { 
            metadataObj.push({label:"Principal Component Analysis",value: this.pca});
        }

        metadataObj = metadataObj.concat([
            {label:"Date (Year)", value: this.date},
            {label:"Image Author", value: this.imageAuthor},
            {label:"License", value: this.license},
            {label:"Copyright", value: this.copyright},
        ]);

        return metadataObj;
    }
}

export default ManifestMetadata;