"""Replay a failed WebGL clang invocation without modifying Unity build artifacts."""
import argparse
import json
import os
from pathlib import Path
import re
import subprocess
import time

parser = argparse.ArgumentParser()
parser.add_argument("--source", default="UnityEngine.CoreModule__4.cpp")
parser.add_argument("--optimization", default="O3", choices=["O0", "O1", "O2", "O3", "Os", "Oz"])
args = parser.parse_args()
repo = Path(__file__).resolve().parent.parent
project = repo / "AIClient"
output = repo / "Tools/output/hybridclr_genall"
output.mkdir(parents=True, exist_ok=True)
log = Path(os.environ["LOCALAPPDATA"]) / "Unity/Editor/Editor.log"
commands = re.findall(r"emcc: error: '(.*?)' failed", log.read_text(encoding="utf-8", errors="replace"))
command = next(c for c in reversed(commands) if args.source in c and "clang++.exe" in c)
command = re.sub(r" -O[0-3sz](?= )", " -" + args.optimization, command)
stem = args.source.replace(".cpp", "") + "_" + args.optimization
object_file = output / (stem + ".o")
command = re.sub(r" -o .*$", ' -o "' + object_file.as_posix() + '"', command)
environment = os.environ.copy()
temp = output / "tmp"
temp.mkdir(exist_ok=True)
environment["TEMP"] = str(temp)
environment["TMP"] = str(temp)
started = time.monotonic()
result = subprocess.run(command, cwd=project, env=environment, capture_output=True, timeout=180)
(output / (stem + ".log")).write_bytes(result.stdout + result.stderr)
report = {
    "source": args.source, "optimization": args.optimization,
    "returncode": result.returncode, "seconds": round(time.monotonic() - started, 3),
    "objectBytes": object_file.stat().st_size if object_file.exists() else 0,
    "command": command,
}
(output / (stem + ".json")).write_text(json.dumps(report, indent=2), encoding="utf-8")
print(json.dumps({k: v for k, v in report.items() if k != "command"}))