"""Enforce branch-aware coverage for every eligible backend module."""

import argparse
import json
from pathlib import Path


ROOT = Path(__file__).resolve().parents[1]
EXCLUDED_NAMES = {"__init__.py", "apps.py"}
EXCLUDED_CONFIG = {
    "config/asgi.py",
    "config/wsgi.py",
    "config/services/location.py",
    "config/services/notifications.py",
    "config/services/zarinpal.py",
}


def eligible_modules():
    for source in ("apps", "core", "config"):
        for path in (ROOT / source).rglob("*.py"):
            relative = path.relative_to(ROOT).as_posix()
            if path.name in EXCLUDED_NAMES or relative in EXCLUDED_CONFIG:
                continue
            if any(part in {"tests", "migrations"} for part in path.parts):
                continue
            if relative.startswith("config/settings/"):
                continue
            yield relative


def main():
    parser = argparse.ArgumentParser()
    parser.add_argument("coverage_json", type=Path)
    parser.add_argument("--minimum", type=float, default=80.0)
    args = parser.parse_args()
    report = json.loads(args.coverage_json.read_text(encoding="utf-8"))
    files = {name.replace("\\", "/"): data for name, data in report["files"].items()}
    failures = []
    for module in sorted(eligible_modules()):
        data = files.get(module)
        if data is None:
            failures.append(f"{module}: absent from coverage report")
            continue
        summary = data["summary"]
        total = summary["num_statements"] + summary["num_branches"]
        if total == 0:
            continue
        covered = total - summary["missing_lines"] - summary["missing_branches"]
        percent = covered * 100 / total
        print(f"{percent:6.2f}%  {module}")
        if percent < args.minimum:
            failures.append(f"{module}: {percent:.2f}% < {args.minimum:.2f}%")
    if failures:
        print("Coverage gate failed:")
        for failure in failures:
            print(f"  {failure}")
        raise SystemExit(1)


if __name__ == "__main__":
    main()