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 load_manifest():
    return load_json(CRM_PACK / "pack.json")


def iter_last_activity_date_fields():
    specs = load_json(CRM_PACK / "objects" / "standard_objects_spec.json")
    for spec in specs:
        for field in spec.get("fields", []):
            if field.get("apiName") == "LastActivityDate":
                yield spec.get("apiName"), field


class LastActivityDateContractsTest(unittest.TestCase):
    def test_account_and_contact_declare_read_only_last_activity_date(self):
        manifest_paths = {
            component.get("path")
            for component in load_manifest().get("components", [])
            if component.get("kind") == "object_spec"
        }
        self.assertIn("objects/standard_objects_spec.json", manifest_paths)

        declarations = list(iter_last_activity_date_fields())
        self.assertEqual(len(declarations), 2)

        actual = {object_api_name: field for object_api_name, field in declarations}

        expected = {
            "apiName": "LastActivityDate",
            "label": "Last Activity",
            "type": "date",
            "createable": False,
            "updateable": False,
        }

        self.assertEqual(actual["Account"], expected)
        self.assertEqual(actual["Contact"], expected)

    def test_last_activity_date_declarations_do_not_introduce_custom_payload(self):
        declarations = list(iter_last_activity_date_fields())
        self.assertEqual(len(declarations), 2)

        by_object = dict(declarations)
        self.assertEqual(set(by_object.keys()), {"Account", "Contact"})

        for object_api_name, field in declarations:
            with self.subTest(object=object_api_name):
                self.assertFalse(object_api_name.endswith("__c"))
                self.assertFalse(field["apiName"].endswith("__c"))


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