import js from "@eslint/js";
import tseslint from "typescript-eslint";
import reactHooks from "eslint-plugin-react-hooks";

/* The clock guard.

   The artifact's sync bug was a fresh device stamping its own empty defaults
   as newer than the server's real data. db/writes.ts owns the distinction
   between a seed write (updated_at stays 0) and a user edit (stamped), so it
   is the only file under src/db/ allowed to read the clock. Anywhere else,
   reaching for Date.now() means someone is about to stamp a row without
   deciding which kind of write it is. */
const CLOCK_BAN = [
  {
    selector: "CallExpression[callee.object.name='Date'][callee.property.name='now']",
    message:
      "Only db/writes.ts may read the clock. Use a seedX() helper (leaves updated_at 0) " +
      "or an editX() helper (stamps it) — see the timestamp rule in db/writes.ts.",
  },
  {
    selector: "NewExpression[callee.name='Date']",
    message:
      "Only db/writes.ts may read the clock. Use a seedX() or editX() helper from db/writes.ts.",
  },
];

export default tseslint.config(
  // lib/, data/ and validate.mjs are copied in from the export bundle
  // unchanged and must stay byte-identical — they are not ours to restyle.
  {
    ignores: [
      "**/dist/**",
      "**/node_modules/**",
      "export/**",
      "vendor/**",
      "app/android/**",
      "lib/**",
      "data/**",
      "validate.mjs",
    ],
  },
  js.configs.recommended,
  ...tseslint.configs.recommended,
  // Build scripts and the shared modules are plain Node ESM.
  {
    files: ["tools/**/*.mjs", "shared/**/*.mjs", "*.config.js"],
    languageOptions: {
      globals: {
        console: "readonly",
        process: "readonly",
        URL: "readonly",
        fetch: "readonly",
        Buffer: "readonly",
      },
    },
  },
  /* The rules of hooks, and exhaustive deps in particular. A stale closure
     in an effect is what let the tutor seed its opening turn three times. */
  {
    files: ["app/src/**/*.{ts,tsx}"],
    plugins: { "react-hooks": reactHooks },
    rules: {
      "react-hooks/rules-of-hooks": "error",
      "react-hooks/exhaustive-deps": "warn",
    },
  },
  {
    files: ["app/src/db/**/*.ts"],
    rules: { "no-restricted-syntax": ["error", ...CLOCK_BAN] },
  },
  {
    files: ["app/src/db/writes.ts"],
    rules: { "no-restricted-syntax": "off" },
  },
);