/**
 * Scans app page routes and writes src/lib/sitemap-config.generated.json
 * for GET /meshkee/sitemap-config.json (Meshkee sitemap sync).
 */
import fs from "node:fs";
import path from "node:path";
import { fileURLToPath } from "node:url";

const root = path.resolve(path.dirname(fileURLToPath(import.meta.url)), "..");
const appDir = path.join(root, "src", "app");
const outFile = path.join(root, "src", "lib", "sitemap-config.generated.json");

const EXCLUDE_SEGMENTS = new Set([
  "api",
  "meshkee",
  "admin",
  "auth",
  "login",
  "checkout",
  "cart",
  "account",
]);

const PRIORITY = {
  "/": { changefreq: "daily", priority: 1.0 },
  "/about": { changefreq: "monthly", priority: 0.6 },
  "/contact": { changefreq: "monthly", priority: 0.5 },
  "/products": { changefreq: "weekly", priority: 0.8 },
  "/portfolio": { changefreq: "weekly", priority: 0.7 },
  "/blog": { changefreq: "weekly", priority: 0.7 },
  "/videos": { changefreq: "weekly", priority: 0.6 },
};

function websiteDomain() {
  return (
    process.env.NEXT_PUBLIC_WEBSITE_DOMAIN ||
    process.env.WEBSITE_DOMAIN ||
    process.env.NEXT_PUBLIC_MESHKEE_DOMAIN ||
    "farrokhwin.com"
  );
}

function walkPages(dir, segments = []) {
  /** @type {string[]} */
  const pages = [];
  if (!fs.existsSync(dir)) return pages;

  for (const entry of fs.readdirSync(dir, { withFileTypes: true })) {
    if (entry.name.startsWith(".") || entry.name === "node_modules") continue;
    const full = path.join(dir, entry.name);

    if (entry.isDirectory()) {
      if (EXCLUDE_SEGMENTS.has(entry.name)) continue;
      if (/^\[.+\]$/.test(entry.name) || /^\(.+\)$/.test(entry.name)) {
        if (/^\(.+\)$/.test(entry.name)) {
          pages.push(...walkPages(full, segments));
        }
        continue;
      }
      pages.push(...walkPages(full, [...segments, entry.name]));
      continue;
    }

    if (
      entry.name === "page.tsx" ||
      entry.name === "page.ts" ||
      entry.name === "page.jsx" ||
      entry.name === "page.js"
    ) {
      const routePath = segments.length ? `/${segments.join("/")}` : "/";
      pages.push(routePath);
    }
  }

  return pages;
}

function main() {
  const paths = [...new Set(walkPages(appDir))].sort((a, b) => {
    if (a === "/") return -1;
    if (b === "/") return 1;
    return a.localeCompare(b);
  });

  const staticPages = paths.map((routePath) => {
    const meta = PRIORITY[routePath] ?? { changefreq: "monthly", priority: 0.5 };
    return { path: routePath, ...meta };
  });

  const config = {
    baseUrl: `https://${websiteDomain()}`,
    staticPages,
  };

  fs.mkdirSync(path.dirname(outFile), { recursive: true });
  fs.writeFileSync(outFile, `${JSON.stringify(config, null, 2)}\n`, "utf8");
  console.log(`Wrote ${path.relative(root, outFile)} (${staticPages.length} static pages)`);
}

main();