"""Tests for contract product package_spec JSON codec."""
from app.utils.crm_package_spec import (
    decode_package_specs,
    encode_package_specs,
    normalize_package_specs_list,
    resolve_package_specs_from_payload,
)


def test_decode_legacy_scalar():
    assert decode_package_specs("25kg/桶") == ["25kg/桶"]
    assert decode_package_specs("  槽罐车  ") == ["槽罐车"]


def test_decode_empty():
    assert decode_package_specs(None) == []
    assert decode_package_specs("") == []
    assert decode_package_specs("   ") == []


def test_decode_json_array():
    assert decode_package_specs('["25kg/桶", "槽罐车"]') == ["25kg/桶", "槽罐车"]
    assert decode_package_specs('["  a  ", "b", "a"]') == ["a", "b"]


def test_decode_invalid_json_as_scalar():
    assert decode_package_specs("[not-json") == ["[not-json"]
    assert decode_package_specs('{"a":1}') == ['{"a":1}']


def test_encode_roundtrip():
    raw = encode_package_specs(["25kg/桶", "槽罐车"])
    assert decode_package_specs(raw) == ["25kg/桶", "槽罐车"]
    assert raw.startswith("[")


def test_encode_dedupe_preserve_order():
    assert decode_package_specs(encode_package_specs(["a", " b ", "a", "c"])) == ["a", "b", "c"]


def test_encode_empty_is_empty_string():
    assert encode_package_specs([]) == ""
    assert encode_package_specs(None) == ""


def test_normalize_package_specs_list():
    assert normalize_package_specs_list(["  x ", "", "y", "x"]) == ["x", "y"]


def test_resolve_from_payload_prefers_package_specs():
    assert resolve_package_specs_from_payload(
        {"packageSpecs": ["25kg/桶", "槽罐车"], "packageSpec": "ignore"}
    ) == ["25kg/桶", "槽罐车"]


def test_resolve_from_payload_legacy_scalar():
    assert resolve_package_specs_from_payload({"packageSpec": "槽罐车"}) == ["槽罐车"]
    assert resolve_package_specs_from_payload({"package_spec": "吨桶"}) == ["吨桶"]