import { readdir, readFile } from "node:fs/promises";
import { extname, relative, resolve } from "node:path";
import { fileURLToPath } from "node:url";

const frontendDir = fileURLToPath(new URL("../", import.meta.url));
const sourceDir = resolve(frontendDir, "src");
const runtimeDir = resolve(sourceDir, "runtime");
const sourceExtensions = new Set([".ts", ".tsx", ".vue", ".js", ".jsx"]);
const violations = [];

const walk = async (directory) => {
  const entries = await readdir(directory, { withFileTypes: true });
  return (
    await Promise.all(
      entries.map(async (entry) => {
        const path = resolve(directory, entry.name);
        return entry.isDirectory() ? walk(path) : path;
      }),
    )
  ).flat();
};

for (const path of await walk(sourceDir)) {
  if (!sourceExtensions.has(extname(path)) || path.startsWith(`${runtimeDir}/`)) continue;

  const source = await readFile(path, "utf8");
  const file = relative(frontendDir, path);
  if (source.includes("@tauri-apps/") || source.includes("__TAURI")) {
    violations.push(`${file}: direct Tauri access is only allowed inside src/runtime`);
  }
  if (/from\s+["'][^"']*\/runtime\/[^"']+["']/.test(source)) {
    violations.push(`${file}: import platform behavior through src/runtime/index.ts`);
  }
}

if (violations.length > 0) {
  console.error(`Runtime boundary violations:\n${violations.map((item) => `  ${item}`).join("\n")}`);
  process.exitCode = 1;
} else {
  console.log("Runtime boundary is respected.");
}