"""C12 — IME composition Enter behaviour.

Runs `c12_ime.mjs` via Node (no jsdom dep, just Node ≥ 18). Records PASS/FAIL
into results/C12.json so build_report picks it up.

Test cases covered:
  1. Plain Enter → send
  2. Shift+Enter → no send (newline)
  3. Enter during IME composition → no send
  4. Enter on compositionend tick → no send (deferred flag)
  5. Enter after composition tick → send
  6. Cmd+Enter still sends (backwards compat)
  7. Non-Enter key → no send

The test reads static/app.js and asserts the production handler still contains
the three guards (Enter check, shift check, _composing check). If app.js drifts
the test fails — drift-proof regression guard.
"""

from __future__ import annotations

import subprocess
import sys
from pathlib import Path

sys.path.insert(0, str(Path(__file__).resolve().parents[1]))

from verify_v04._common import record  # noqa: E402

_HERE = Path(__file__).resolve().parent
_TEST_JS = _HERE / "c12_ime.mjs"


def main() -> int:
    print("\n[C12] IME composition Enter behaviour")
    try:
        proc = subprocess.run(
            ["node", str(_TEST_JS)],
            capture_output=True,
            text=True,
            timeout=30,
            check=False,
        )
    except FileNotFoundError:
        record("C12", False, "node binary not found in PATH")
        return 1
    except subprocess.TimeoutExpired:
        record("C12", False, "node test timed out (>30s)")
        return 1

    out = proc.stdout.strip()
    err = proc.stderr.strip()
    if out:
        print(out)
    if err:
        print(err, file=sys.stderr)

    ok = proc.returncode == 0
    summary = out.splitlines()[-1] if out else "(no output)"
    record("C12", ok, summary)
    return 0 if ok else 1


if __name__ == "__main__":
    sys.exit(main())