from sqlalchemy.dialects import mysql

from app.services.pl_internal_customer import INTERNAL_CUSTOMER_NAMES
from app.services.pl_plan_contract_gap import compute_contract_gap_sides, plan_has_contract_gap_exists

INTERNAL = next(iter(INTERNAL_CUSTOMER_NAMES))


def test_both_external_no_contracts_gaps_both():
    sides = compute_contract_gap_sides(
        supplier_name="外部供方A",
        customer_name="外部需方B",
        supplier_contract_count=0,
        demander_contract_count=0,
    )
    assert sides == ["supplier", "demander"]


def test_internal_supplier_external_demander_missing_only_demander():
    sides = compute_contract_gap_sides(
        supplier_name=INTERNAL,
        customer_name="外部需方B",
        supplier_contract_count=0,
        demander_contract_count=0,
    )
    assert sides == ["demander"]


def test_both_internal_no_gap():
    sides = compute_contract_gap_sides(
        supplier_name=INTERNAL,
        customer_name=INTERNAL,
        supplier_contract_count=0,
        demander_contract_count=0,
    )
    assert sides == []


def test_external_with_contracts_no_gap():
    sides = compute_contract_gap_sides(
        supplier_name="外部供方A",
        customer_name="外部需方B",
        supplier_contract_count=1,
        demander_contract_count=2,
    )
    assert sides == []


def test_empty_names_treated_as_non_internal_gap_both():
    sides = compute_contract_gap_sides(
        supplier_name=None,
        customer_name="",
        supplier_contract_count=0,
        demander_contract_count=0,
    )
    assert sides == ["supplier", "demander"]


def _compile(clause) -> str:
    return str(
        clause.compile(dialect=mysql.dialect(), compile_kwargs={"literal_binds": True})
    ).lower()


def test_plan_has_contract_gap_exists_mentions_contract_and_internal_names():
    clause = plan_has_contract_gap_exists("shanxia2.0")
    sql = _compile(clause)

    assert "pl_plan_contract" in sql
    assert "supplier" in sql
    assert "demander" in sql