from pathlib import Path

from services import pchome_mapping_backlog_service as compatibility_facade
from services.pchome_mapping_backlog import contracts, evidence, policies


ROOT = Path(__file__).resolve().parents[1]


def test_policy_registry_is_extracted_without_changing_legacy_exports():
    assert len(policies.__all__) == 96
    assert compatibility_facade.BACKLOG_POLICY == policies.BACKLOG_POLICY
    assert (
        compatibility_facade.AUTO_POLICY_DB_APPLY_CONTROLLED_DRY_RUN_PACKAGE_POLICY
        == policies.AUTO_POLICY_DB_APPLY_CONTROLLED_DRY_RUN_PACKAGE_POLICY
    )
    assert compatibility_facade.PCHOME_FETCH_ALLOWED_DOMAIN == "24h.pchome.com.tw"


def test_evidence_and_contract_functions_keep_legacy_import_identity():
    assert (
        compatibility_facade.parse_pchome_product_page_evidence_html
        is evidence.parse_pchome_product_page_evidence_html
    )
    assert compatibility_facade.parse_unit_package_basis is evidence.parse_unit_package_basis
    assert (
        compatibility_facade._ai_exception_compatibility_fields
        is contracts._ai_exception_compatibility_fields
    )


def test_extracted_unit_parser_preserves_ai_exception_and_no_write_contract():
    parsed = compatibility_facade.parse_unit_package_basis("理膚寶水 B5 40ml x2 超值組")

    assert parsed["estimated_total_quantity"] == 80
    assert parsed["ai_exception_required"] is True
    assert parsed["primary_human_gate_count"] == 0
    assert parsed["writes_database"] is False
    assert parsed["fetches_external_sites"] is False


def test_legacy_facade_is_smaller_after_first_p0_extraction():
    facade = ROOT / "services/pchome_mapping_backlog_service.py"

    assert sum(1 for _ in facade.open(encoding="utf-8")) < 44_300