"""Check the actual adapter boundary: missing information and honest abstention."""
import copy
import importlib.util
import json
from pathlib import Path
import subprocess
import sys

import pytest
from axiomesh.core import word_matrix
import numpy as np

ROOT = Path(__file__).resolve().parents[1]
spec = importlib.util.spec_from_file_location("axiomesh_agent_interface", ROOT / "agent_interface.py")
adapter = importlib.util.module_from_spec(spec)
spec.loader.exec_module(adapter)


def example(name):
    return json.loads((ROOT / "examples" / name).read_text())


def test_capability_growth_exposes_a_real_program_witness():
    request = example("agent_revalidate.json")
    old = copy.deepcopy(request)
    del old["operators"]["b"]
    assert adapter.dispatch(old)["status"] == "exact"
    result = adapter.dispatch(request)
    assert result["status"] == "ambiguous"
    assert result["required_extra_scalar_observations"] == 1
    witness = result["certificate"]
    v = np.asarray(witness["null_vector"])
    assert np.all(np.asarray(request["memory"]["matrix"]) @ v % request["p"] == 0)
    ops = {a: np.asarray(t) for a, t in request["operators"].items()}
    q = np.asarray(request["query"])[witness["query"]]
    difference = int(q @ word_matrix(witness["word"], ops, request["p"]) @ v) % request["p"]
    assert difference == witness["output_difference"] != 0
    assert result["observations_acquired"] == 0


def test_explicit_observation_permits_compilation_and_fresh_recovery(tmp_path):
    result = adapter.dispatch(example("agent_compile.json"))
    assert result["status"] == "committed" and result["output"] == [9]
    assert "seed" not in result["capsule"]["program"]
    capsule = result["capsule"]
    capsule["memory"]["shares"].pop("1")
    (tmp_path / "capsule.json").write_text(json.dumps(capsule))
    restored = adapter.dispatch({"task": "recover_and_run", "capsule": "capsule.json", "word": ["b", "a"]}, tmp_path)
    assert restored["status"] == "exact" and restored["output"] == [9]
    assert restored["source_state_used"] is False


def test_not_enough_surviving_shares_abstains(tmp_path):
    capsule = adapter.dispatch(example("agent_compile.json"))["capsule"]
    capsule["memory"]["shares"] = {"1": capsule["memory"]["shares"]["1"]}
    (tmp_path / "capsule.json").write_text(json.dumps(capsule))
    result = adapter.dispatch({"task": "recover_and_run", "capsule": "capsule.json", "word": []}, tmp_path)
    assert result["status"] == "ambiguous" and result["output"] is None


def test_inconsistent_measurements_do_not_get_repaired():
    request = example("agent_compile.json")
    request["memory"]["matrix"].append([1, 0, 0])
    request["memory"]["rhs"].append(7)
    result = adapter.dispatch(request)
    assert result["status"] == "inconsistent"
    assert result["required_extra_scalar_observations"] is None
    assert result["output"] is None


def test_adapter_budget_exhaustion_is_not_a_certificate():
    request = example("agent_revalidate.json")
    request["product_budget"] = 0
    with pytest.raises(RuntimeError, match="budget exhausted"):
        adapter.dispatch(request)


@pytest.mark.parametrize("bad_prime", [True, 4, 257])
def test_invalid_or_oversized_field_is_rejected(bad_prime):
    request = example("agent_revalidate.json")
    request["p"] = bad_prime
    with pytest.raises(ValueError):
        adapter.dispatch(request)


@pytest.mark.parametrize("bad", [True, 1.5, -1, 101])
def test_noncanonical_or_noninteger_coefficient_is_rejected(bad):
    request = example("agent_revalidate.json")
    request["query"][0][0] = bad
    with pytest.raises(ValueError):
        adapter.dispatch(request)


def test_capsule_path_cannot_leave_the_repository():
    with pytest.raises(ValueError, match="inside the repository"):
        adapter.dispatch({"task": "recover_and_run", "capsule": "../outside.json", "word": []})


def test_unknown_action_and_extra_keys_are_rejected():
    request = example("agent_compile.json")
    request["word"] = ["undeclared"]
    with pytest.raises(ValueError, match="undeclared"):
        adapter.dispatch(request)
    request = example("agent_revalidate.json")
    request["execute_python"] = "print('untrusted')"
    with pytest.raises(ValueError, match="extra"):
        adapter.dispatch(request)


def test_zero_query_compilation_reports_no_observable():
    request = example("agent_compile.json")
    request["query"] = [[0, 0, 0]]
    result = adapter.dispatch(request)
    assert result["status"] == "zero_observable" and result["output"] is None


def test_empty_memory_is_an_honest_hole():
    request = example("agent_revalidate.json")
    request["memory"] = {"matrix": [], "rhs": []}
    result = adapter.dispatch(request)
    assert result["status"] == "ambiguous"
    assert result["required_extra_scalar_observations"] == 3


def test_json_cli_recovery_and_hole_exit_codes():
    for name, expected_code, status in [("agent_recover.json", 0, "exact"), ("agent_revalidate.json", 2, "ambiguous")]:
        proc = subprocess.run([sys.executable, str(ROOT / "agent_interface.py"), "--request", str(ROOT / "examples" / name)],
                              capture_output=True, text=True)
        assert proc.returncode == expected_code
        assert json.loads(proc.stdout)["status"] == status
        assert not proc.stderr