"""发票额度流水汇总与退回幂等。"""
from decimal import Decimal

from app.services.bx.invoice_ledger import (
    ENTRY_CREDIT_RELEASE,
    ENTRY_CREDIT_UPLOAD,
    ENTRY_DEBIT_DELETE,
    ENTRY_DEBIT_REIMBURSE,
    should_skip_release,
    summarize_entries,
)


def test_summarize_upload_and_reimburse():
    rows = [
        {"entry_type": ENTRY_CREDIT_UPLOAD, "amount": Decimal("1000")},
        {"entry_type": ENTRY_DEBIT_REIMBURSE, "amount": Decimal("300")},
    ]
    s = summarize_entries(rows)
    assert s["total_amount"] == Decimal("1000")
    assert s["used_amount"] == Decimal("300")
    assert s["balance"] == Decimal("700")


def test_summarize_delete_and_release():
    rows = [
        {"entry_type": ENTRY_CREDIT_UPLOAD, "amount": Decimal("500")},
        {"entry_type": ENTRY_DEBIT_DELETE, "amount": Decimal("100")},
        {"entry_type": ENTRY_DEBIT_REIMBURSE, "amount": Decimal("200")},
        {"entry_type": ENTRY_CREDIT_RELEASE, "amount": Decimal("200")},
    ]
    s = summarize_entries(rows)
    assert s["total_amount"] == Decimal("400")
    assert s["used_amount"] == Decimal("0")
    assert s["balance"] == Decimal("400")


def test_release_idempotent_guard():
    assert should_skip_release(has_debit=True, has_release=True) is True
    assert should_skip_release(has_debit=True, has_release=False) is False
    assert should_skip_release(has_debit=False, has_release=False) is True


def test_summarize_allows_negative_balance():
    """提交占用可超过已上传总额，余额可为负（补票后再回升）。"""
    rows = [
        {"entry_type": ENTRY_CREDIT_UPLOAD, "amount": Decimal("100")},
        {"entry_type": ENTRY_DEBIT_REIMBURSE, "amount": Decimal("300")},
    ]
    s = summarize_entries(rows)
    assert s["total_amount"] == Decimal("100")
    assert s["used_amount"] == Decimal("300")
    assert s["balance"] == Decimal("-200")