import json
import unittest
from pathlib import Path


REPO_ROOT = Path(__file__).resolve().parents[1]
CRM_PACK = REPO_ROOT / "salesforce-crm-standard"


def load_json(path: Path):
    with path.open(encoding="utf-8") as handle:
        return json.load(handle)


def object_spec(api_name: str):
    specs = load_json(CRM_PACK / "objects" / "standard_objects_spec.json")
    for spec in specs:
        if spec.get("apiName") == api_name:
            return spec
    raise AssertionError(f"{api_name} object spec missing")


def field_spec(spec: dict, api_name: str):
    for field in spec.get("fields", []):
        if field.get("apiName") == api_name:
            return field
    raise AssertionError(f"{spec.get('apiName')}.{api_name} field spec missing")


class CRMStandardContractNameTest(unittest.TestCase):
    def test_contract_name_is_required_compound_from_contract_number(self):
        # Transitional CRM-pack shape: the v66 describe snapshot models
        # ContractNumber as the Contract name field and omits Contract.Name.
        # The current hand-curated pack keeps Contract.Name to match existing
        # layouts and lookup-display consumers, but makes it read-only in
        # practice by deriving it from ContractNumber through compound metadata.
        contract = object_spec("Contract")
        name = field_spec(contract, "Name")

        self.assertEqual(name.get("label"), "Contract Name")
        self.assertEqual(name.get("type"), "string")
        self.assertTrue(name.get("required"))
        self.assertTrue(name.get("isNameField"))
        self.assertTrue(name.get("isCompound"))
        self.assertEqual(name.get("composedFrom"), ["ContractNumber"])


if __name__ == "__main__":
    unittest.main()