import { isMetadataRoute, isStaticMetadataRouteFile } from "./is-metadata-route";
import path from "../../shared/lib/isomorphic/path";
import { interpolateDynamicPath } from "../../server/server-utils";
import { getNamedRouteRegex } from "../../shared/lib/router/utils/route-regex";
import { djb2Hash } from "../../shared/lib/hash";
import { normalizeAppPath } from "../../shared/lib/router/utils/app-paths";
import { normalizePathSep } from "../../shared/lib/page-path/normalize-path-sep";
/*
 * 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}
 */ function getMetadataRouteSuffix(page) {
    let suffix = "";
    if (page.includes("(") && page.includes(")") || page.includes("@")) {
        suffix = djb2Hash(page).toString(36).slice(0, 6);
    }
    return suffix;
}
/**
 * Fill the dynamic segment in the metadata route
 *
 * Example:
 * fillMetadataSegment('/a/[slug]', { params: { slug: 'b' } }, 'open-graph') -> '/a/b/open-graph'
 *
 */ export function fillMetadataSegment(segment, params, imageSegment) {
    const pathname = normalizeAppPath(segment);
    const routeRegex = getNamedRouteRegex(pathname, false);
    const route = interpolateDynamicPath(pathname, params, routeRegex);
    const suffix = getMetadataRouteSuffix(segment);
    const routeSuffix = suffix ? `-${suffix}` : "";
    const { name , ext  } = path.parse(imageSegment);
    return normalizePathSep(path.join(route, `${name}${routeSuffix}${ext}`));
}
/**
 * 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) {
    if (!isMetadataRoute(page)) {
        return page;
    }
    let route = page;
    let suffix = "";
    if (route === "/robots") {
        route += ".txt";
    } else if (route === "/manifest") {
        route += ".webmanifest";
    } else if (route.endsWith("/sitemap")) {
        route += ".xml";
    } else {
        // Remove the file extension, e.g. /route-path/robots.txt -> /route-path
        const pathnamePrefix = page.slice(0, -(path.basename(page).length + 1));
        suffix = getMetadataRouteSuffix(pathnamePrefix);
    }
    // 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 isStaticMetadataFile = isStaticMetadataRouteFile(page);
        const { dir , name: baseName , ext  } = path.parse(route);
        const isStaticRoute = page.startsWith("/robots") || page.startsWith("/manifest") || isStaticMetadataFile;
        route = path.posix.join(dir, `${baseName}${suffix ? `-${suffix}` : ""}${ext}`, isStaticRoute ? "" : "[[...__metadata_id__]]", "route");
    }
    return route;
}

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