"""Concurrency check of web/store.py wjson/rjson: one thread rewrites a job file while another reads it.

Reproduces the 2026-10-12 E2E failure (reader saw an empty file during write_text). Pass = no read errors
and no writer errors. usage: python test_store_concurrency.py [writes]
"""
import sys
import tempfile
import threading
import time
from pathlib import Path

sys.path.insert(0, str(Path(__file__).resolve().parents[1] / "web"))
import store  # noqa: E402

N = int(sys.argv[1]) if len(sys.argv) > 1 else 500
p = Path(tempfile.mkdtemp()) / "G1_job.json"
store.wjson(p, {"state": "대기", "log": []})
stop = threading.Event()
read_err, reads = [], [0]


def reader():
    while not stop.is_set():
        try:
            store.rjson(p)
            reads[0] += 1
        except Exception as e:
            read_err.append(repr(e))


t = threading.Thread(target=reader, daemon=True)
t.start()
write_err, t0 = [], time.time()
try:
    for i in range(N):
        try:
            store.wjson(p, {"state": "실행 중", "log": ["x" * 200] * (i % 50)})
        except Exception as e:
            write_err.append(repr(e))
finally:
    stop.set()
    t.join(5)
print(f"writes {N} reads {reads[0]} read_errors {len(read_err)} write_errors {len(write_err)} "
      f"{time.time() - t0:.1f}s", read_err[:2], write_err[:2])
sys.exit(0 if not read_err and not write_err else 1)