import { readdir, readFile } from 'node:fs/promises';
import { join, relative } from 'node:path';

// Mistakes this client has made, each with what to do instead.
const rules = [
  {
    pattern: /crypto\.randomUUID/,
    why: 'crypto.randomUUID only exists in secure contexts (https or localhost); use uuidv7 from api.ts',
  },
  {
    pattern: /<[a-z][^>]*\sautofocus\b/,
    why: 'autofocus does not take inside a flow node or a mounted window; focus with an attachment',
  },
  {
    pattern: /svelte-flow__node\s*>\s*\.window-slot/,
    why: 'where a window sits is board.placeOf, on its slot as data-place; do not read it off its ancestors',
  },
];

const root = new URL('../src', import.meta.url).pathname;

async function* sources(dir) {
  for (const entry of await readdir(dir, { withFileTypes: true })) {
    const path = join(dir, entry.name);
    if (entry.isDirectory()) yield* sources(path);
    else if (/\.(svelte|ts|css)$/.test(entry.name) && !entry.name.endsWith('.gen.d.ts')) yield path;
  }
}

for await (const path of sources(root)) {
  const lines = (await readFile(path, 'utf8')).split('\n');
  lines.forEach((line, at) => {
    for (const { pattern, why } of rules) {
      if (!pattern.test(line)) continue;
      console.error(`src/${relative(root, path)}:${at + 1}: ${why}`);
      process.exitCode = 1;
    }
  });
}