"""Pin the Money serialization contract (Phase 2 Decimal migration, BE-02):
NUMERIC storage, but JSON emits plain numbers so the frontend's `number`
types keep working."""

import json
from datetime import datetime
from decimal import Decimal

from sqlmodel import select

from app.models.models import (
    Account,
    AccountRead,
    Bank,
    Currency,
    Transaction,
    TransactionRead,
)


def test_money_columns_are_numeric():
    assert str(Transaction.__table__.c.amount.type) == "NUMERIC(15, 2)"
    assert str(Account.__table__.c.balance.type) == "NUMERIC(15, 2)"


def test_money_serializes_as_json_number():
    read = TransactionRead(
        id=1,
        amount=Decimal("25000.50"),
        merchant="X",
        date=datetime(2026, 4, 1),
        created_at=datetime(2026, 4, 1),
    )
    dumped = read.model_dump(mode="json")
    assert dumped["amount"] == 25000.5
    assert isinstance(dumped["amount"], float)
    # and the whole payload is json.dumps-able (no Decimal leaks)
    json.dumps(dumped)


def test_money_accepts_float_input():
    # n8n and the SPA POST plain JSON numbers; they must coerce to Decimal.
    read = AccountRead(
        id=1,
        bank=Bank.BAC,
        currency=Currency.CRC,
        label="x",
        balance=1234.56,
        updated_at=datetime(2026, 4, 1),
    )
    assert read.balance == Decimal("1234.56")


def test_decimal_roundtrip_through_db(session):
    session.add(
        Transaction(
            amount=Decimal("9999.99"),
            merchant="ROUNDTRIP",
            date=datetime(2026, 4, 1),
        )
    )
    session.commit()
    row = session.exec(
        select(Transaction).where(Transaction.merchant == "ROUNDTRIP")
    ).one()
    assert isinstance(row.amount, Decimal)
    assert row.amount == Decimal("9999.99")