from __future__ import annotations

from uuid import UUID

import pytest

from app.contracts import TextCheck
from app.fingerprint import canonical_json, fingerprint
from app.normalization import normalize_text


def test_jcs_field_order_and_unicode_are_deterministic() -> None:
    left = {"z": None, "а": "е\u0301", "a": 1}
    right = {"a": 1, "z": None, "а": "е\u0301"}
    assert canonical_json(left) == canonical_json(right)
    assert fingerprint(left) == fingerprint(right)
    assert canonical_json(left).decode() == '{"a":1,"z":null,"а":"е́"}'


def test_dto_fingerprint_contains_explicit_null() -> None:
    dto = TextCheck(
        message_id=UUID("00000000-0000-4000-8000-000000000001"),
        content_kind="text",
        text="hello",
        attachment=None,
    )
    assert b'"attachment":null' in canonical_json(dto)
    assert len(fingerprint(dto)) == 32


def test_normalization_nfkc_whitespace_and_flags() -> None:
    result = normalize_text("Ａ\r\nB\u200b\u202e C")
    assert result.display.startswith("A\nB")
    assert result.analysis == "A\nB C"
    assert result.flags == ("bidi_control", "default_ignorable", "zero_width")


def test_normalization_hard_limit() -> None:
    with pytest.raises(ValueError):
        normalize_text("x" * 10_001)