"""Message-ID and subject normalization (SPEC §7.1, §7.3)."""

from __future__ import annotations

from app.threading_.normalize import (
    is_synthetic,
    normalize_message_id,
    normalize_reference_list,
    normalize_subject,
    synthesize_message_id,
)


def test_normalize_message_id_strips_brackets_and_lowercases_domain() -> None:
    assert normalize_message_id("<Abc.123@Example.COM>") == "Abc.123@example.com"
    assert normalize_message_id("  <x@Y.Z>  ") == "x@y.z"
    # local part case is preserved, domain lowercased
    assert normalize_message_id("<CaseSensitive@Domain.Com>") == "CaseSensitive@domain.com"


def test_normalize_message_id_rejects_invalid() -> None:
    assert normalize_message_id(None) is None
    assert normalize_message_id("no-at-sign") is None
    assert normalize_message_id("<>") is None
    assert normalize_message_id("@nolocal.com") is None


def test_normalize_reference_list_order_and_dedupe() -> None:
    raw = "<a@x.com> <b@y.com> <a@X.com>"
    assert normalize_reference_list(raw) == ["a@x.com", "b@y.com"]
    assert normalize_reference_list("") == []
    assert normalize_reference_list(None) == []


def test_normalize_reference_list_whitespace_separated_without_brackets() -> None:
    assert normalize_reference_list("a@x.com b@y.com") == ["a@x.com", "b@y.com"]


def test_synthetic_id() -> None:
    sid = synthesize_message_id(b"raw bytes here")
    assert sid.endswith("@synthetic.local")
    assert is_synthetic(sid)
    assert not is_synthetic("real@example.com")
    assert not is_synthetic(None)
    # deterministic
    assert synthesize_message_id(b"raw bytes here") == sid


def test_normalize_subject_strips_prefixes() -> None:
    assert normalize_subject("Re: Hello") == "Hello"
    assert normalize_subject("RE: FW: Fwd:  Hello  world") == "Hello world"
    assert normalize_subject("Odp: Cześć") == "Cześć"  # Polish reply prefix
    assert normalize_subject("PD: X") == "X"
    assert normalize_subject("No prefix") == "No prefix"
    assert normalize_subject("") == ""