#!/usr/bin/env python3
# SPDX-License-Identifier: GPL-3.0-or-later
"""Mutation guardrails for the Phase-1.0M offline artifact."""

from __future__ import annotations

import argparse
import copy
import importlib.util
from pathlib import Path
import sys


def load(path: Path):
    spec = importlib.util.spec_from_file_location("phase10m", path)
    assert spec and spec.loader
    module = importlib.util.module_from_spec(spec)
    sys.modules[spec.name] = module
    spec.loader.exec_module(module)
    return module


def require(value: bool, message: str) -> None:
    if not value:
        raise RuntimeError(message)


def main() -> int:
    parser = argparse.ArgumentParser()
    parser.add_argument("--root", type=Path, required=True)
    args = parser.parse_args()
    root = args.root.resolve()
    validator = load(root / "tools/validate_retroarch_phase10m.py")
    record = validator.load_json(
        root / "manifests/retroarch/phase-1.0m-write-free-defaults.json"
    )
    cases = []

    def case(name):
        def register(function):
            cases.append((name, function))
            return function
        return register

    @case("01 artifact is exact and ineligible")
    def _(): require(validator.artifact_is_exact_and_ineligible(record["artifact"]), "artifact rejected")

    @case("02 changed hash fails")
    def _():
        value = dict(record["artifact"]); value["sha256"] = "0" * 64
        require(not validator.artifact_is_exact_and_ineligible(value), "changed hash accepted")

    @case("03 execution eligibility fails")
    def _():
        value = dict(record["artifact"]); value["execution_eligible"] = True
        require(not validator.artifact_is_exact_and_ineligible(value), "eligible artifact accepted")

    @case("04 correction is narrow")
    def _(): require(validator.correction_is_narrow(record["source_correction"]), "correction rejected")

    @case("05 lost path derivation fails")
    def _():
        value = dict(record["source_correction"]); value["path_derivation_preserved"] = False
        require(not validator.correction_is_narrow(value), "lost derivation accepted")

    @case("06 runtime mkdir claim fails")
    def _():
        value = dict(record["source_correction"]); value["runtime_effect"] = "PROVEN"
        require(not validator.correction_is_narrow(value), "runtime claim accepted")

    @case("07 firewall is preserved")
    def _(): require(validator.firewall_is_preserved(record["write_firewall"]), "firewall rejected")

    @case("08 missing wrapper fails")
    def _():
        value = copy.deepcopy(record["write_firewall"]); value["linker_wrap_option_count"] = 16
        require(not validator.firewall_is_preserved(value), "weakened firewall accepted")

    @case("09 successful write semantics fail")
    def _():
        value = copy.deepcopy(record["write_firewall"]); value["wrapper_errno"] = "SUCCESS"
        require(not validator.firewall_is_preserved(value), "successful write accepted")

    @case("10 artifact audit is exact")
    def _(): require(validator.audit_is_exact(record["artifact_audit"]), "audit rejected")

    @case("11 RWX segment fails")
    def _():
        value = copy.deepcopy(record["artifact_audit"]); value["rwx_load_segments"] = 1
        require(not validator.audit_is_exact(value), "RWX accepted")

    @case("12 receive import fails")
    def _():
        value = copy.deepcopy(record["artifact_audit"]); value["receive_import"] = True
        require(not validator.audit_is_exact(value), "receive import accepted")

    @case("13 GNM import fails")
    def _():
        value = copy.deepcopy(record["artifact_audit"]); value["gnm_imports"] = ["sceGnmSubmit"]
        require(not validator.audit_is_exact(value), "GNM import accepted")

    @case("14 hardware evidence claim fails")
    def _():
        value = copy.deepcopy(record["artifact_audit"]); value["hardware_evidence"] = True
        require(not validator.audit_is_exact(value), "hardware claim accepted")

    @case("15 all current authorizations are false")
    def _(): require(validator.all_false(record["current_authorizations"], validator.AUTHORIZATION_FIELDS), "authority active")

    @case("16 transfer authority fails")
    def _():
        value = dict(record["current_authorizations"]); value["device_transfer_authorized"] = True
        require(not validator.all_false(value, validator.AUTHORIZATION_FIELDS), "transfer authority accepted")

    @case("17 execution authority fails")
    def _():
        value = dict(record["current_authorizations"]); value["device_execution_authorized"] = True
        require(not validator.all_false(value, validator.AUTHORIZATION_FIELDS), "execution authority accepted")

    @case("18 no device action occurred")
    def _(): require(validator.all_false(record["phase_actions"], validator.DEVICE_ACTION_FIELDS), "device action recorded")

    @case("19 offline build is recorded")
    def _(): require(record["phase_actions"]["target_build_performed"] is True, "build omitted")

    @case("20 I04 remains unproven")
    def _(): require(record["inherited_runtime_contract"]["i04"] == "UNPROVEN", "I04 invented")

    failures = []
    for name, function in cases:
        try:
            function()
            print(f"PASS {name}")
        except Exception as error:  # noqa: BLE001 - mutation harness
            failures.append(f"{name}: {error}")
            print(f"FAIL {name}: {error}")
    if failures:
        return 1
    print(f"Phase-1.0M guardrails passed: {len(cases)}")
    return 0


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