from pathlib import Path
import importlib.util
import unittest


ROOT = Path(__file__).resolve().parents[1]
SCRIPT_PATH = ROOT / "scripts" / "lab_007_grid_power_packet.py"
DOC_PATH = ROOT / "docs" / "LAB_007_GRID_POWER_REQUEST.md"


def load_module(path: Path, name: str):
    assert path.exists(), f"missing {path.relative_to(ROOT)}"
    spec = importlib.util.spec_from_file_location(name, path)
    assert spec and spec.loader
    module = importlib.util.module_from_spec(spec)
    spec.loader.exec_module(module)
    return module


class TestLab007GridPowerPacket(unittest.TestCase):
    def test_packet_marks_missing_site_fields_and_uses_eversource_as_primary(self):
        mod = load_module(SCRIPT_PATH, "lab_007_grid_power_packet")
        packet = mod.build_packet({})

        self.assertEqual(packet["primary_utility"]["name"], "Eversource")
        self.assertIn("Lempster", packet["territory_evidence"])
        self.assertFalse(packet["ready_to_contact"])
        self.assertIn("site_address", packet["missing_fields"])
        self.assertIn("pole_distance_feet", packet["missing_fields"])
        self.assertIn("terrain_description", packet["missing_fields"])

    def test_packet_with_site_details_builds_contact_ready_email_and_call_checklist(self):
        mod = load_module(SCRIPT_PATH, "lab_007_grid_power_packet")
        packet = mod.build_packet(
            {
                "site_address": "123 Example Rd, Lempster, NH",
                "pole_distance_feet": 280,
                "terrain_description": "mixed woods, uphill grade, likely overhead run",
                "service_size": "200A residential service",
            }
        )

        self.assertTrue(packet["ready_to_contact"])
        self.assertEqual(packet["missing_fields"], [])
        self.assertIn("123 Example Rd", packet["email_body"])
        self.assertIn("280 feet", packet["email_body"])
        self.assertIn("meter base", packet["email_body"])
        self.assertIn("per-kWh rate", packet["estimate_request_checklist"])
        self.assertIn("800-362-7764", packet["primary_utility"]["phone"])
        self.assertIn("nhnewservice@eversource.com", packet["primary_utility"]["email"])

    def test_repo_contains_grounded_request_doc(self):
        self.assertTrue(DOC_PATH.exists(), "missing committed LAB-007 request doc")
        text = DOC_PATH.read_text(encoding="utf-8")
        for snippet in (
            "# LAB-007 — Grid Power Hookup Estimate Request Packet",
            "Eversource",
            "800-362-7764",
            "nhnewservice@eversource.com",
            "No formal estimate has been received yet.",
            "pole/transformer",
            "monthly base charge",
            "per-kWh rate",
        ):
            self.assertIn(snippet, text)


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