"""GTI Fiscal Agent installation preflight (READ-ONLY):  python agent/scripts/preflight.py [--env-file FILE] [--json]

Prints PREFLIGHT=PASS|FAIL and the blockers; exit code 0 on PASS, 2 on FAIL. Secrets are never printed.
"""
import argparse
import json
import os
import sys
from pathlib import Path

AGENT_ROOT = Path(__file__).resolve().parents[1]
sys.path.insert(0, str(AGENT_ROOT / "src"))
from gti_fiscal_agent.preflight import run_preflight  # noqa: E402


def load_env(path):
    if path and Path(path).exists():
        for line in Path(path).read_text(encoding="utf-8").splitlines():
            line = line.strip()
            if line and not line.startswith("#") and "=" in line:
                k, _, v = line.partition("=")
                os.environ.setdefault(k.strip(), v.strip())


def main(argv=None):
    ap = argparse.ArgumentParser()
    ap.add_argument("--env-file")
    ap.add_argument("--json", action="store_true")
    a = ap.parse_args(argv)
    load_env(a.env_file or os.environ.get("GTI_AGENT_ENV_FILE") or AGENT_ROOT.parent / ".env")
    os.environ.setdefault("AGENT_STATE_DB", str(AGENT_ROOT / "agent_state.sqlite"))
    os.environ.setdefault("AGENT_LOG_PATH", str(AGENT_ROOT / "logs" / "agent.log"))
    res = run_preflight(os.environ)
    if a.json:
        print(json.dumps(res, ensure_ascii=False, indent=1, default=str))
    else:
        for c in res["checks"]:
            print(f"  [{c['status']:<4}] {c['name']:<24} {c['detail']}")
        print(f"PREFLIGHT={res['PREFLIGHT']}")
        for b in res["blockers"]:
            print(f"BLOCKER: {b}")
    raise SystemExit(0 if res["PREFLIGHT"] == "PASS" else 2)


if __name__ == "__main__":
    main()