import { buildLocalizedPath, getLocaleCodes } from '../i18n/index.js';
/** Resolve a doc's path in one locale (root for home). Null if no slug there. */ function pathForLocale(doc, locale, config, homeSlug) {
    const slugField = doc.slug;
    const slug = typeof slugField === 'string' ? slugField : slugField && typeof slugField === 'object' ? slugField[locale] : undefined;
    if (!slug) {
        return null;
    }
    return buildLocalizedPath({
        config,
        homeSlug,
        locale,
        slugs: {
            [locale]: slug
        }
    }) ?? null;
}
/**
 * Builds afterChange + afterDelete hooks that revalidate a page's ISR cache when
 * an editor saves or deletes it — so changes appear immediately instead of
 * waiting for the revalidate window. Without this, ISR means editors wait; with
 * it, ISR is usable for a CMS.
 *
 * Handles every locale, the root (home), AND a changed slug (revalidates both the
 * old and new path so neither goes stale). revalidatePath is injected — the
 * plugin never imports next/cache (safe under generate:importmap / plain Node).
 *
 *   // in your Media/Pages collection config, from a project file that CAN import next/cache:
 *   import { revalidatePath } from 'next/cache'
 *   import { buildRevalidateHook } from '@intecion/ipal-kit'
 *   const { afterChange, afterDelete } = buildRevalidateHook({ revalidatePath, config: i18nConfig })
 *   // hooks: { afterChange: [afterChange], afterDelete: [afterDelete] }
 */ export function buildRevalidateHook({ config, homeSlug, revalidatePath }) {
    const locales = getLocaleCodes(config);
    const afterChange = ({ doc, previousDoc })=>{
        const seen = new Set();
        for (const locale of locales){
            // New path.
            const newPath = pathForLocale(doc, locale, config, homeSlug);
            if (newPath && !seen.has(newPath)) {
                revalidatePath(newPath);
                seen.add(newPath);
            }
            // Old path, if the slug changed — so the old URL doesn't serve stale content.
            if (previousDoc) {
                const oldPath = pathForLocale(previousDoc, locale, config, homeSlug);
                if (oldPath && oldPath !== newPath && !seen.has(oldPath)) {
                    revalidatePath(oldPath);
                    seen.add(oldPath);
                }
            }
        }
        return doc;
    };
    const afterDelete = ({ doc })=>{
        const seen = new Set();
        for (const locale of locales){
            const path = pathForLocale(doc, locale, config, homeSlug);
            if (path && !seen.has(path)) {
                revalidatePath(path);
                seen.add(path);
            }
        }
        return doc;
    };
    return {
        afterChange,
        afterDelete
    };
}

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