"""Characterization of the BAC paste-import line parser."""

from datetime import datetime

from app.api.v1.endpoints.import_transactions import (
    make_reference_hash,
    parse_bac_line,
)
from app.models.models import TransactionType


class TestParseBacLine:
    def test_tab_separated_purchase(self):
        line = "15/04/2026\tWALMART\\SAN JOSE\\CR\t25,000.50 CRC"
        parsed = parse_bac_line(line)
        assert parsed is not None
        assert parsed["date"] == datetime(2026, 4, 15)
        assert parsed["merchant"] == "WALMART"
        assert parsed["city"] == "SAN JOSE"
        assert parsed["amount"] == 25000.50
        assert parsed["currency"] == "CRC"
        assert parsed["transaction_type"] == TransactionType.COMPRA

    def test_multispace_separated_usd(self):
        line = "01/05/2026   AMAZON\\SEATTLE\\US   12.99 USD"
        parsed = parse_bac_line(line)
        assert parsed is not None
        assert parsed["amount"] == 12.99
        assert parsed["currency"] == "USD"

    def test_negative_amount_is_refund(self):
        parsed = parse_bac_line("15/04/2026\tSTORE\\X\\CR\t-5,000.00 CRC")
        assert parsed is not None
        assert parsed["transaction_type"] == TransactionType.DEVOLUCION
        assert parsed["amount"] == 5000.0  # stored as absolute value

    def test_pago_recibido_is_refund(self):
        parsed = parse_bac_line("15/04/2026\tPAGO RECIBIDO\\\\\t100.00 CRC")
        assert parsed is not None
        assert parsed["transaction_type"] == TransactionType.DEVOLUCION

    def test_unparseable_lines_return_none(self):
        assert parse_bac_line("") is None
        assert parse_bac_line("not a transaction") is None
        assert parse_bac_line("99/99/2026\tX\\Y\\Z\t1.00 CRC") is None
        assert parse_bac_line("15/04/2026\tX\\Y\\Z\t1.00 GBP") is None


class TestReferenceHash:
    def test_deterministic_and_merchant_normalized(self):
        a = make_reference_hash(datetime(2026, 4, 15), " walmart ", 100.0, "CRC")
        b = make_reference_hash(datetime(2026, 4, 15), "WALMART", 100.0, "CRC")
        assert a == b
        assert len(a) == 16

    def test_different_inputs_differ(self):
        base = make_reference_hash(datetime(2026, 4, 15), "X", 100.0, "CRC")
        assert make_reference_hash(datetime(2026, 4, 16), "X", 100.0, "CRC") != base
        assert make_reference_hash(datetime(2026, 4, 15), "X", 100.1, "CRC") != base
        assert make_reference_hash(datetime(2026, 4, 15), "X", 100.0, "USD") != base