import { isMetadataRoute } from "./is-metadata-route";
import path from "../../shared/lib/isomorphic/path";
import { djb2Hash } from "../../shared/lib/hash";
/*
 * If there's special convention like (...) or @ in the page path,
 * Give it a unique hash suffix to avoid conflicts
 *
 * e.g.
 * /app/open-graph.tsx -> /open-graph/route
 * /app/(post)/open-graph.tsx -> /open-graph/route-[0-9a-z]{6}
 */ export function getMetadataRouteSuffix(page) {
    let suffix = "";
    if (page.includes("(") && page.includes(")") || page.includes("@")) {
        suffix = djb2Hash(page).toString(36).slice(0, 6);
    }
    return suffix;
}
/**
 * Map metadata page key to the corresponding route
 *
 * static file page key:    /app/robots.txt -> /robots.xml -> /robots.txt/route
 * dynamic route page key:  /app/robots.tsx -> /robots -> /robots.txt/route
 *
 * @param page
 * @returns
 */ export function normalizeMetadataRoute(page) {
    let route = page;
    if (isMetadataRoute(page)) {
        // Remove the file extension, e.g. /route-path/robots.txt -> /route-path
        const pathnamePrefix = page.slice(0, -(path.basename(page).length + 1));
        const suffix = getMetadataRouteSuffix(pathnamePrefix);
        if (route === "/sitemap") {
            route += ".xml";
        }
        if (route === "/robots") {
            route += ".txt";
        }
        if (route === "/manifest") {
            route += ".webmanifest";
        }
        // Support both /<metadata-route.ext> and custom routes /<metadata-route>/route.ts.
        // If it's a metadata file route, we need to append /[id]/route to the page.
        if (!route.endsWith("/route")) {
            const { dir , name , ext  } = path.parse(route);
            const isSingleRoute = page.startsWith("/sitemap") || page.startsWith("/robots") || page.startsWith("/manifest") || page === "/favicon.ico";
            route = path.join(dir, `${name}${suffix ? `-${suffix}` : ""}${ext}`, isSingleRoute ? "" : "[[...__metadata_id__]]", "route");
        }
    }
    return route;
}

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