"""
Tests for POST /intents/{id}/execute and POST /admin/executions/{id}/resolve.

arf_enterprise is not installed in this test environment (by design -- it's
an optional, proprietary package; see routes_governance.py's
ENTERPRISE_EXECUTOR_AVAILABLE guard). The 501 "not available"/"not enabled"
paths are real, unconditional behavior and tested as such. For the
success/pending/error paths, the enterprise classes referenced in
routes_governance.py (EnterpriseExecutor, FakeCloudActuator,
PendingApprovalError, EnterpriseExecutionError, EnterpriseSafetyError) are
monkeypatched with lightweight stand-ins -- this tests arf-api's own glue
code (existence/tenant check, exception-to-HTTP-status mapping, response
shaping), not EnterpriseExecutor's internals, which are already covered by
the enterprise repo's own test suite.
"""
import pytest
from app.database.models_intents import TenantDB
import app.api.routes_governance as routes_governance
import app.api.routes_admin as routes_admin

TENANT_ID = "test-tenant"


@pytest.fixture(autouse=True)
def seed_tenant(db_session):
    tenant = db_session.query(TenantDB).filter_by(id=TENANT_ID).first()
    if not tenant:
        db_session.add(TenantDB(id=TENANT_ID, name="Test Tenant"))
        db_session.commit()


def _evaluate_intent(client):
    payload = {
        "intent_type": "provision_resource",
        "environment": "prod",
        "resource_type": "database",
        "region": "eastus",
        "size": "Standard",
        "estimated_cost": 1200,
        "policy_violations": [],
        "requester": "alice",
        "provenance": {},
        "configuration": {},
    }
    resp = client.post(
        "/api/v1/intents/evaluate", json=payload, headers={"X-Tenant-ID": TENANT_ID}
    )
    assert resp.status_code == 200, resp.text
    data = resp.json()
    # data["intent_id"] (top level, set by evaluate_intent_endpoint right
    # before returning: result["intent_id"] = deterministic_id) is what
    # save_evaluated_intent actually persisted to IntentDB.deterministic_id.
    # data["healing_intent"]["intent_id"] is a separate, independently
    # generated id belonging to the HealingIntent object itself -- using it
    # here instead was the exact bug that made every test in this file 404.
    return data["intent_id"], data["healing_intent"]


class _FakePendingApprovalError(Exception):
    def __init__(self, message, level, approval_required, approval_id=None):
        super().__init__(message)
        self.level = level
        self.approval_required = approval_required
        self.approval_id = approval_id


class _FakeExecutionError(Exception):
    pass


class _FakeSafetyError(Exception):
    pass


class _FakeConfig:
    """Stands in for EnterpriseConfig, which is None in the import fallback
    whenever arf_enterprise isn't installed -- as it isn't in CI, since it's
    a private-repo package deliberately kept out of requirements.txt.

    Records what it was constructed with so a test can assert that
    ARF_TRUSTED_SIGNING_KEYS actually reaches the executor. Without that
    the trust store could silently go back to empty and every signed intent
    would be rejected as "Untrusted signing key" with nothing failing here.
    """
    last_trusted_signing_keys = None

    def __init__(self, trusted_signing_keys=None, **kwargs):
        self.trusted_signing_keys = trusted_signing_keys
        type(self).last_trusted_signing_keys = trusted_signing_keys


class _FakeExecutor:
    """Stands in for EnterpriseExecutor. Behavior is selected via a
    class-level `mode` set by each test before the request is made."""
    mode = "success"
    last_config = None

    def __init__(self, config=None, actuator=None, approval_store=None,
                 on_verified_outcome=None):
        self._on_verified_outcome = on_verified_outcome
        type(self).last_config = config

    async def execute(self, intent, human_approved=False, admin_approved=False):
        if self.mode == "success":
            if self._on_verified_outcome:
                self._on_verified_outcome(intent, True, {"observed": {"status": "running"}})
            return {"status": "success", "verified": {"status": "running"}, "compensating_action": None}
        if self.mode == "pending":
            raise _FakePendingApprovalError(
                "needs human approval", level="HumanInLoop", approval_required="human",
                approval_id="appr_test123",
            )
        if self.mode == "execution_error":
            raise _FakeExecutionError("ladder denied this intent")
        if self.mode == "safety_error":
            raise _FakeSafetyError("blast radius exceeded")
        raise RuntimeError(f"unhandled test mode: {self.mode}")


@pytest.fixture
def enterprise_execution_enabled(monkeypatch):
    monkeypatch.setattr(routes_governance, "ENTERPRISE_EXECUTOR_AVAILABLE", True)
    monkeypatch.setattr(routes_governance, "ARF_ENABLE_EXECUTION", True)
    monkeypatch.setattr(routes_governance, "EnterpriseExecutor", _FakeExecutor)
    monkeypatch.setattr(routes_governance, "EnterpriseConfig", _FakeConfig)
    monkeypatch.setattr(routes_governance, "FakeCloudActuator", lambda: None)
    monkeypatch.setattr(routes_governance, "PendingApprovalError", _FakePendingApprovalError)
    monkeypatch.setattr(routes_governance, "EnterpriseExecutionError", _FakeExecutionError)
    monkeypatch.setattr(routes_governance, "EnterpriseSafetyError", _FakeSafetyError)
    _FakeExecutor.mode = "success"
    yield
    _FakeExecutor.mode = "success"


def test_execute_returns_501_when_enterprise_package_not_available(client):
    resp = client.post(
        "/api/v1/intents/does-not-matter/execute",
        json={"healing_intent": {}},
    )
    assert resp.status_code == 501
    assert "not installed" in resp.json()["detail"]


def test_execute_returns_501_when_not_enabled(client, monkeypatch):
    monkeypatch.setattr(routes_governance, "ENTERPRISE_EXECUTOR_AVAILABLE", True)
    monkeypatch.setattr(routes_governance, "ARF_ENABLE_EXECUTION", False)
    resp = client.post(
        "/api/v1/intents/does-not-matter/execute",
        json={"healing_intent": {}},
    )
    assert resp.status_code == 501
    assert "not enabled" in resp.json()["detail"]


def test_execute_returns_404_for_unknown_intent(client, enterprise_execution_enabled):
    resp = client.post(
        "/api/v1/intents/does-not-exist-at-all/execute",
        json={"healing_intent": {}},
    )
    assert resp.status_code == 404


def test_execute_success_path(client, enterprise_execution_enabled):
    deterministic_id, healing_intent = _evaluate_intent(client)
    resp = client.post(
        f"/api/v1/intents/{deterministic_id}/execute",
        json={"healing_intent": healing_intent, "human_approved": True},
    )
    assert resp.status_code == 200, resp.text
    assert resp.json()["status"] == "success"


def test_trusted_signing_keys_reach_the_executor_split_not_raw(
    client, enterprise_execution_enabled, monkeypatch
):
    """ARF_TRUSTED_SIGNING_KEYS holds N comma-separated fingerprints.
    Passing the raw string through as a one-element list would register the
    literal "abc,def" as a single key -- trusting neither real one -- and
    would look identical from the outside, since both spellings produce a
    non-empty list and a 200 here."""
    monkeypatch.setenv("ARF_TRUSTED_SIGNING_KEYS", " abc123 , def456 ,, ")
    deterministic_id, healing_intent = _evaluate_intent(client)
    resp = client.post(
        f"/api/v1/intents/{deterministic_id}/execute",
        json={"healing_intent": healing_intent, "human_approved": True},
    )
    assert resp.status_code == 200, resp.text
    assert _FakeConfig.last_trusted_signing_keys == ["abc123", "def456"]
    assert _FakeExecutor.last_config is not None


def test_unset_trusted_signing_keys_trusts_nothing_rather_than_the_empty_string(
    client, enterprise_execution_enabled, monkeypatch
):
    """Fail closed. `"".split(",")` is `[""]`, so the naive parse would
    register the empty string as a trusted fingerprint -- trusting a key
    nobody holds is harmless, but it makes "trusts nothing" and
    "misconfigured" indistinguishable in the logs."""
    monkeypatch.delenv("ARF_TRUSTED_SIGNING_KEYS", raising=False)
    deterministic_id, healing_intent = _evaluate_intent(client)
    resp = client.post(
        f"/api/v1/intents/{deterministic_id}/execute",
        json={"healing_intent": healing_intent, "human_approved": True},
    )
    assert resp.status_code == 200, resp.text
    assert _FakeConfig.last_trusted_signing_keys == []


def test_execute_pending_approval_returns_202_with_approval_id(client, enterprise_execution_enabled):
    deterministic_id, healing_intent = _evaluate_intent(client)
    _FakeExecutor.mode = "pending"
    resp = client.post(
        f"/api/v1/intents/{deterministic_id}/execute",
        json={"healing_intent": healing_intent},
    )
    assert resp.status_code == 202
    body = resp.json()
    assert body["approval_id"] == "appr_test123"
    assert body["level"] == "HumanInLoop"


def test_execute_execution_error_returns_422(client, enterprise_execution_enabled):
    deterministic_id, healing_intent = _evaluate_intent(client)
    _FakeExecutor.mode = "execution_error"
    resp = client.post(
        f"/api/v1/intents/{deterministic_id}/execute",
        json={"healing_intent": healing_intent, "human_approved": True},
    )
    assert resp.status_code == 422
    assert "ladder denied" in resp.json()["detail"]


def test_execute_safety_error_returns_422(client, enterprise_execution_enabled):
    deterministic_id, healing_intent = _evaluate_intent(client)
    _FakeExecutor.mode = "safety_error"
    resp = client.post(
        f"/api/v1/intents/{deterministic_id}/execute",
        json={"healing_intent": healing_intent, "human_approved": True},
    )
    assert resp.status_code == 422
    assert "blast radius" in resp.json()["detail"]


def test_execute_belongs_to_different_tenant_returns_404(client, enterprise_execution_enabled, db_session):
    """A deterministic_id that exists but under a different tenant must not
    be executable by this caller -- same tenant-scoping guarantee
    record_outcome already provides for /intents/outcome."""
    other_tenant = "other-tenant"
    if not db_session.query(TenantDB).filter_by(id=other_tenant).first():
        db_session.add(TenantDB(id=other_tenant, name="Other Tenant"))
        db_session.commit()

    from app.database.models_intents import IntentDB
    import datetime
    db_session.add(IntentDB(
        deterministic_id="belongs-to-other-tenant",
        tenant_id=other_tenant,
        intent_type="provision_resource",
        payload={},
        oss_payload={},
        environment="prod",
        evaluated_at=datetime.datetime.utcnow(),
        risk_score="0.1",
    ))
    db_session.commit()

    resp = client.post(
        "/api/v1/intents/belongs-to-other-tenant/execute",
        json={"healing_intent": {}},
    )
    assert resp.status_code == 404


# ---------------------------------------------------------------------------
# Admin resolve/list endpoints
# ---------------------------------------------------------------------------

TEST_ADMIN_KEY = "test-admin-key-for-governance-execute-tests"


class _FakeApprovalRecord:
    def __init__(self, id, decision_id, intent_id, level, approval_required, requested_at):
        self.id = id
        self.decision_id = decision_id
        self.intent_id = intent_id
        self.level = level
        self.approval_required = approval_required
        self.requested_at = requested_at


class _FakeApprovalStore:
    def __init__(self):
        import datetime
        self._pending = {
            "appr_1": _FakeApprovalRecord(
                "appr_1", "dec_1", "intent-1", "HumanInLoop", "human", datetime.datetime.utcnow()
            )
        }
        self.resolved = []

    def list_pending(self, limit=100, offset=0):
        return list(self._pending.values())[:limit]

    def resolve(self, approval_id, approved, resolved_by, note=None):
        if approval_id not in self._pending:
            return False
        del self._pending[approval_id]
        self.resolved.append((approval_id, approved, resolved_by, note))
        return True


@pytest.fixture
def admin_with_approval_store(monkeypatch, client):
    monkeypatch.setattr(routes_admin, "ADMIN_API_KEY", TEST_ADMIN_KEY)
    fake_store = _FakeApprovalStore()
    client.app.state.approval_store = fake_store
    yield fake_store
    client.app.state.approval_store = None


def test_list_pending_executions_returns_501_without_store(client, monkeypatch):
    monkeypatch.setattr(routes_admin, "ADMIN_API_KEY", TEST_ADMIN_KEY)
    client.app.state.approval_store = None
    resp = client.get("/api/v1/admin/executions/pending", headers={"X-Admin-Key": TEST_ADMIN_KEY})
    assert resp.status_code == 501


def test_list_pending_executions(client, admin_with_approval_store):
    resp = client.get("/api/v1/admin/executions/pending", headers={"X-Admin-Key": TEST_ADMIN_KEY})
    assert resp.status_code == 200
    body = resp.json()
    assert body["total"] == 1
    assert body["pending"][0]["approval_id"] == "appr_1"


def test_resolve_execution_approval(client, admin_with_approval_store):
    resp = client.post(
        "/api/v1/admin/executions/appr_1/resolve",
        headers={"X-Admin-Key": TEST_ADMIN_KEY},
        json={"approved": True, "note": "looks fine"},
    )
    assert resp.status_code == 200
    assert admin_with_approval_store.resolved == [("appr_1", True, "admin", "looks fine")]


def test_resolve_unknown_approval_returns_404(client, admin_with_approval_store):
    resp = client.post(
        "/api/v1/admin/executions/does-not-exist/resolve",
        headers={"X-Admin-Key": TEST_ADMIN_KEY},
        json={"approved": True},
    )
    assert resp.status_code == 404