/**
 * Reads a possibly-localized field value into a plain string.
 * With localized fields at this hook stage the value is the active-locale
 * string, so we just coerce defensively.
 */ function readString(value) {
    if (typeof value === 'string' && value.trim()) {
        return value.trim();
    }
    return undefined;
}
/**
 * Builds a beforeChange hook that fills empty SEO meta fields from document
 * content. Only fills when the meta field is blank — never overwrites what an
 * editor typed. This runs server-side on every create/update, so editors get
 * sensible meta without clicking "auto-generate".
 *
 * The plugin doesn't know the client's collection shape, so the field mapping
 * is configurable; defaults follow the website template.
 */ export function buildAutoFillMetaHook(mapping = {}) {
    const titleField = mapping.title ?? 'title';
    const descriptionField = mapping.description;
    return ({ data })=>{
        if (!data) {
            return data;
        }
        // plugin-seo stores meta as a group under `meta`
        const meta = data.meta ?? {};
        // Fill meta.title from the document title when empty
        if (!readString(meta.title)) {
            const sourceTitle = readString(data[titleField]);
            if (sourceTitle) {
                meta.title = sourceTitle;
            }
        }
        // Fill meta.description from a configured field when empty
        if (descriptionField && !readString(meta.description)) {
            const sourceDescription = readString(data[descriptionField]);
            if (sourceDescription) {
                meta.description = sourceDescription;
            }
        }
        data.meta = meta;
        return data;
    };
}

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