import { findDefaultRedirect } from "../utils/discover.js";
/**
 * Middleware that redirects the root path (/) to the first available document
 * when no root document exists in the discovery result.
 *
 * The redirect preserves any query string from the original request.
 *
 * @param getDiscovery - Getter function for the current discovery result
 * @returns Middleware handler
 *
 * @example
 * ```ts
 * let discovery = await discoverDocuments()
 * app.get('/*', redirectRoot(() => discovery), ...)
 * ```
 */
export const redirectRoot = getDiscovery => {
    return async (c, next) => {
        const discovery = getDiscovery();
        const urlPath = c.req.path;
        // Only handle root path
        if (urlPath !== '/') {
            return next();
        }
        // If root document exists, continue to next middleware
        if (discovery.documents.has('/')) {
            return next();
        }
        // Find a default redirect target
        const redirectTo = findDefaultRedirect(discovery.sortedPaths);
        if (!redirectTo) {
            return next();
        }
        // Preserve query string in redirect
        const url = new URL(c.req.url);
        const queryString = url.search;
        const redirectPath = redirectTo + queryString;
        return new Response(null, {
            status: 302,
            headers: { Location: redirectPath },
        });
    };
};
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