import fs from "node:fs";
import path from "node:path";
import glob from "fast-glob";

async function main() {
  const blogRoot = path.join(process.cwd(), "src/content/blog");
  const entries = await glob("**/*.mdx", { cwd: blogRoot });
  const manifest = new Map();

  for (const entry of entries) {
    const segments = entry.split("/");

    if (segments.length < 2) {
      continue;
    }

    const [slug, filename] = segments;

    if (!slug || slug.startsWith("[")) {
      continue;
    }

    const locale = filename.replace(/\.mdx$/, "");

    if (!locale) {
      continue;
    }

    if (!manifest.has(slug)) {
      manifest.set(slug, new Set());
    }

    manifest.get(slug).add(locale);
  }

  const sortedManifest = Array.from(manifest.entries()).sort(([a], [b]) =>
    a.localeCompare(b)
  );

  const lines = [];
  lines.push("// This file is auto-generated by scripts/generate-blog-manifest.mjs");
  lines.push("/// <reference path=\"../types/mdx.d.ts\" />");
  lines.push("// Do not edit manually.\n");
  lines.push("export const blogModuleLoaders = {");

  for (const [slug, locales] of sortedManifest) {
    lines.push(`  "${slug}": {`);

    const sortedLocales = Array.from(locales).sort((a, b) => a.localeCompare(b));

    for (const locale of sortedLocales) {
      // 使用 path.posix 确保导入路径始终使用 / (跨平台兼容)
      const importPath = path.posix.join(
        "..",
        "content",
        "blog",
        slug,
        `${locale}.mdx`
      );
      lines.push(`    "${locale}": () => import("${importPath}"),`);
    }

    lines.push("  },");
  }

  lines.push("} as const;\n");

  const targetPath = path.join(process.cwd(), "src/lib/blog-manifest.generated.ts");
  fs.writeFileSync(targetPath, lines.join("\n"), "utf-8");
}

main().catch((error) => {
  console.error(error);
  process.exitCode = 1;
});