#!/usr/bin/env python3
"""Run the Nono Slice 2 hermetic suite and explicit security gates."""

from __future__ import annotations

import argparse
import json
import platform
import shutil
import sys
import unittest
from pathlib import Path

ROOT = Path(__file__).resolve().parents[1]
if str(ROOT) not in sys.path:
    sys.path.insert(0, str(ROOT))

from tests.nono.harness.fixtures import isolated_environment  # noqa: E402
from tests.nono.harness.nono import HostRequirementError, NonoAdapter  # noqa: E402


def _parser() -> argparse.ArgumentParser:
    parser = argparse.ArgumentParser(description=__doc__)
    parser.add_argument("--host", action="store_true", help="run mandatory Linux/Nono 0.74 checks")
    parser.add_argument(
        "--live", action="store_true", help="run separately approved live gate (never implicit)"
    )
    parser.add_argument(
        "--approve-live",
        metavar="APPROVER",
        help="required explicit human approval for --live; absence is an error",
    )
    parser.add_argument("--nono", default=None, help="absolute Nono executable for --host")
    return parser


def run_hermetic() -> int:
    suite = unittest.defaultTestLoader.discover(
        str(ROOT / "tests" / "nono"), pattern="test_*.py", top_level_dir=str(ROOT)
    )
    result = unittest.TextTestRunner(verbosity=2).run(suite)
    return 0 if result.wasSuccessful() else 1


def run_host(executable: str | None) -> int:
    if platform.system() != "Linux":
        print("host gate failed: Linux is required", file=sys.stderr)
        return 2
    selected = executable or shutil.which("nono")
    if selected is None:
        print("host gate failed: nono executable is missing", file=sys.stderr)
        return 2
    selected_path = Path(selected)
    if not selected_path.is_absolute():
        print("host gate failed: nono executable must resolve to an absolute path", file=sys.stderr)
        return 2
    fixture_root = ROOT / "tests" / "nono" / "fixtures" / "core"
    minimal_profile = fixture_root / "minimal.json"
    broad_profile = fixture_root / "broad.json"
    try:
        with isolated_environment(prefix="nono-host-") as fixture:
            session = fixture.session("one")
            adapter = NonoAdapter(
                selected_path,
                cwd=session.repo,
                timeout=20,
                environment=session.environment(fixture.env),
            )
            version = adapter.require_host_0_74()
            validation = adapter.validate_temporary_profile(minimal_profile)
            if not validation.ok:
                print(
                    f"host gate failed: strict validation exited {validation.returncode}: "
                    f"{validation.stderr or validation.stdout}",
                    file=sys.stderr,
                )
                return 1
            shown = adapter.show_temporary_profile(minimal_profile)
            if not shown.ok:
                print("host gate failed: profile show did not succeed", file=sys.stderr)
                return 1
            try:
                resolved = json.loads(shown.stdout)
            except json.JSONDecodeError as error:
                print(f"host gate failed: profile show was not JSON: {error}", file=sys.stderr)
                return 1
            if resolved.get("network", {}).get("block") is not True:
                print("host gate failed: fixture is not network-blocked", file=sys.stderr)
                return 1
            run = adapter.run_temporary_profile(minimal_profile, ["/usr/bin/true"])
            if not run.ok:
                print(
                    f"host gate failed: isolated execution exited {run.returncode}: "
                    f"{run.stderr or run.stdout}",
                    file=sys.stderr,
                )
                return 1

            denied_target = fixture.session("two").tmp / "private.txt"
            denied_target.write_text("denied fixture\n", encoding="utf-8")
            probe = [
                "/usr/bin/python3",
                "-c",
                "from pathlib import Path; Path(__import__('sys').argv[1]).read_text()",
                str(denied_target),
            ]
            denied = adapter.run_temporary_profile(minimal_profile, probe)
            if denied.ok:
                print(
                    "host gate failed: minimal profile read another session's temporary file",
                    file=sys.stderr,
                )
                return 1
            broad_target = session.repo / "broad-readable.txt"
            broad_target.write_text("broad fixture\n", encoding="utf-8")
            broad_probe = [*probe[:-1], str(broad_target)]
            allowed = adapter.run_temporary_profile(
                broad_profile,
                broad_probe,
                allow_cwd=True,
            )
            if not allowed.ok:
                print(
                    "host gate failed: broad fixture did not demonstrate the over-grant",
                    file=sys.stderr,
                )
                return 1
            print(
                json.dumps(
                    {
                        "suite": "host",
                        "nonoVersion": version,
                        "status": "passed",
                        "negativeChecks": 1,
                        "overgrantDetectionChecks": 1,
                    }
                )
            )
            return 0
    except HostRequirementError as error:
        print(f"host gate failed: {error}", file=sys.stderr)
        return 2
    except (OSError, ValueError) as error:
        print(f"host gate failed: {error}", file=sys.stderr)
        return 2


def run_live(approver: str | None) -> int:
    if not isinstance(approver, str) or not approver.strip():
        print("live gate requires --approve-live APPROVER", file=sys.stderr)
        return 2
    # This source harness has no credential broker.  A missing manual check is
    # blocked, never represented as a pass or an implicit unittest skip.
    print(
        json.dumps(
            {
                "suite": "live",
                "approver": approver,
                "status": "blocked",
                "reason": "manual credentialed evidence is not installed in Slice 2",
            }
        )
    )
    return 1


def main(argv: list[str] | None = None) -> int:
    args = _parser().parse_args(argv)
    if args.host and args.live:
        print("choose exactly one of --host or --live", file=sys.stderr)
        return 2
    if args.approve_live is not None and not args.live:
        print("--approve-live is valid only with --live", file=sys.stderr)
        return 2
    if args.host:
        return run_host(args.nono)
    if args.live:
        return run_live(args.approve_live)
    return run_hermetic()


if __name__ == "__main__":
    raise SystemExit(main())