"""Handle validation rules (SPEC §4)."""

from __future__ import annotations

import pytest

from app.config import get_settings
from app.identity.handles import InvalidHandle, full_handle, validate_localpart
from app.identity.reserved import is_reserved
from app.identity.service import resolve_handle

_DOMAIN = get_settings().app_domain


@pytest.mark.parametrize(
    "raw,expected",
    [
        ("alice", "alice"),
        ("Alice", "alice"),  # case-insensitive
        ("  bob  ", "bob"),  # trimmed
        ("a.b_c-d", "a.b_c-d"),
        ("user123", "user123"),
        ("abc", "abc"),  # min length
        ("a" * 30, "a" * 30),  # max length
    ],
)
def test_valid_localparts(raw: str, expected: str) -> None:
    assert validate_localpart(raw) == expected


@pytest.mark.parametrize(
    "raw,code",
    [
        ("ab", "length"),  # too short
        ("a" * 31, "length"),  # too long
        (".alice", "dot_edge"),
        ("alice.", "dot_edge"),
        ("al..ice", "double_dot"),
        ("al ice", "charset"),  # space
        ("aliçe", "charset"),  # non-ascii
        ("al@ice", "charset"),  # '@'
        ("UPPER!", "charset"),
        ("postmaster", "reserved"),
        ("admin", "reserved"),
        ("root", "reserved"),
        ("NoReply", "reserved"),  # reserved, case-insensitive
    ],
)
def test_invalid_localparts(raw: str, code: str) -> None:
    with pytest.raises(InvalidHandle) as exc:
        validate_localpart(raw)
    assert exc.value.code == code


def test_full_handle_appends_domain() -> None:
    assert full_handle("alice") == f"alice@{_DOMAIN}"


def test_reserved_is_case_insensitive() -> None:
    assert is_reserved("ADMIN")
    assert is_reserved("admin")
    assert not is_reserved("alice")


def test_resolve_handle_accepts_localpart_or_full() -> None:
    assert resolve_handle("Alice") == f"alice@{_DOMAIN}"
    assert resolve_handle("alice@other.example") == "alice@other.example"