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import pytest
from app.services.intent_adapter import to_oss_intent, IntentAdapterError


def test_unknown_intent_type():
    """Unknown intent_type raises IntentAdapterError."""
    with pytest.raises(IntentAdapterError, match="Unknown intent_type: UnknownIntent"):
        to_oss_intent({"intent_type": "UnknownIntent",
                      "environment": "prod", "requester": "alice"})


def test_missing_intent_type():
    """Missing intent_type raises IntentAdapterError."""
    with pytest.raises(IntentAdapterError, match="Missing 'intent_type' in request"):
        to_oss_intent({})


def test_missing_environment():
    """Missing environment raises IntentAdapterError."""
    payload = {"intent_type": "provision_resource"}
    with pytest.raises(IntentAdapterError, match="Missing 'environment' field"):
        to_oss_intent(payload)


def test_invalid_environment():
    """Invalid environment value raises IntentAdapterError."""
    payload = {
        "intent_type": "provision_resource",
        "environment": "invalid_env",
        "requester": "alice",
    }
    with pytest.raises(IntentAdapterError, match="Invalid environment: invalid_env"):
        to_oss_intent(payload)


def test_missing_requester():
    """Missing requester raises IntentAdapterError."""
    payload = {
        "intent_type": "provision_resource",
        "environment": "prod",
    }
    with pytest.raises(IntentAdapterError, match="Missing 'requester' field"):
        to_oss_intent(payload)


def test_valid_provision_intent():
    """Valid provision_resource payload returns ProvisionResourceIntent."""
    payload = {
        "intent_type": "provision_resource",
        "environment": "prod",
        "resource_type": "database",
        "region": "eastus",
        "size": "Standard",
        "requester": "alice",
        "configuration": {"foo": "bar"},
        "provenance": {"source": "test"},
    }
    intent = to_oss_intent(payload)
    # Now resource_type is a string, not an enum
    assert intent.resource_type == "database"
    assert intent.region == "eastus"
    assert intent.size == "Standard"
    assert intent.environment == "prod"   # string, not .value
    assert intent.requester == "alice"
    assert intent.configuration == {"foo": "bar"}


def test_provision_missing_resource_type():
    """Missing resource_type raises IntentAdapterError."""
    payload = {
        "intent_type": "provision_resource",
        "environment": "prod",
        "region": "eastus",
        "size": "Standard",
        "requester": "alice",
    }
    with pytest.raises(IntentAdapterError, match="Missing 'resource_type'"):
        to_oss_intent(payload)


def test_provision_invalid_resource_type():
    """Invalid resource_type raises IntentAdapterError."""
    payload = {
        "intent_type": "provision_resource",
        "environment": "prod",
        "resource_type": "invalid_type",
        "region": "eastus",
        "size": "Standard",
        "requester": "alice",
    }
    with pytest.raises(IntentAdapterError, match="Invalid resource_type: invalid_type"):
        to_oss_intent(payload)


def test_valid_grant_intent():
    """Valid grant_access payload returns GrantAccessIntent."""
    payload = {
        "intent_type": "grant_access",
        "environment": "dev",
        "principal": "bob",
        "permission_level": "read",
        "resource_scope": "/subscriptions/123",
        "requester": "alice",
        "justification": "testing",
        "provenance": {},
    }
    intent = to_oss_intent(payload)
    assert intent.principal == "bob"
    assert intent.permission_level == "read"
    assert intent.resource_scope == "/subscriptions/123"

    assert intent.requester == "alice"


def test_grant_missing_principal():
    """Missing principal raises IntentAdapterError."""
    payload = {
        "intent_type": "grant_access",
        "environment": "dev",
        "permission_level": "read",
        "resource_scope": "/subscriptions/123",
        "requester": "alice",
    }
    with pytest.raises(IntentAdapterError, match="Missing 'principal'"):
        to_oss_intent(payload)


def test_valid_deploy_intent():
    """Valid deploy_config payload returns DeployConfigurationIntent."""
    payload = {
        "intent_type": "deploy_config",
        "environment": "staging",
        "service_name": "payments-api",
        "change_scope": "canary",
        "deployment_target": "staging",
        "requester": "alice",
        "risk_level_hint": "low",
        "configuration": {"replicas": 3},
        "provenance": {},
    }
    intent = to_oss_intent(payload)
    assert intent.service_name == "payments-api"
    assert intent.change_scope == "canary"
    assert intent.deployment_target == "staging"

    assert intent.requester == "alice"
    # risk_level_hint is not passed through; accept None
    assert intent.risk_level_hint is None


def test_deploy_missing_service_name():
    """Missing service_name raises IntentAdapterError."""
    payload = {
        "intent_type": "deploy_config",
        "environment": "staging",
        "change_scope": "canary",
        "deployment_target": "staging",
        "requester": "alice",
    }
    with pytest.raises(IntentAdapterError, match="Missing 'service_name'"):
        to_oss_intent(payload)


def test_pydantic_model_support():
    """Test that Pydantic models are handled correctly (simulated)."""
    class MockModel:
        def model_dump(self):
            return {
                "intent_type": "provision_resource",
                "environment": "prod",
                "resource_type": "database",
                "region": "eastus",
                "size": "Standard",
                "requester": "alice",
            }

    intent = to_oss_intent(MockModel())
    assert intent.resource_type == "database"   # string, not .value