"""client_ip 回环地址替换测试（同机 localhost 访问记本机网卡 IPv4）。"""

from __future__ import annotations

import ipaddress

import pytest

from dms.services import audit_service
from dms.services.audit_service import _is_loopback, client_ip

LAN_IP = "192.168.1.5"


@pytest.fixture(autouse=True)
def stub_primary_address(monkeypatch):
    """默认钉住本机网卡解析结果，仅真实解析用例放行。"""
    monkeypatch.setattr(audit_service, "_primary_local_address", lambda: LAN_IP)
    monkeypatch.setattr(audit_service, "_primary_address_cache", None)


def request_client_ip(flask_app, remote_addr=None, headers=None):
    with flask_app.test_request_context(
        "/", environ_base={"REMOTE_ADDR": remote_addr} if remote_addr else {},
        headers=headers or {},
    ):
        return client_ip()


def test_loopback_ipv6_replaced_with_lan_ip(flask_app):
    assert request_client_ip(flask_app, "::1") == LAN_IP
    assert request_client_ip(flask_app, "0:0:0:0:0:0:0:1") == LAN_IP


def test_loopback_ipv4_replaced_with_lan_ip(flask_app):
    assert request_client_ip(flask_app, "127.0.0.1") == LAN_IP


def test_xff_takes_precedence_and_passes_through(flask_app):
    assert request_client_ip(
        flask_app, "::1", headers={"X-Forwarded-For": "192.0.2.10, 10.0.0.1"}
    ) == "192.0.2.10"


def test_non_loopback_remote_addr_passes_through(flask_app):
    assert request_client_ip(flask_app, "192.168.1.20") == "192.168.1.20"


def test_is_loopback_variants():
    assert _is_loopback("::1")
    assert _is_loopback("0:0:0:0:0:0:0:1")
    assert _is_loopback("127.0.0.1")
    assert _is_loopback("127.0.1.9")
    assert _is_loopback("::ffff:127.0.0.1")
    assert _is_loopback("fe80::1%eth0") is False
    assert not _is_loopback("192.168.1.5")
    assert not _is_loopback("not-an-ip")


def test_primary_local_address_real_resolution(flask_app, monkeypatch):
    """真实选路：返回有效 IPv4 且非 ::1 形态（无网卡环境回退 127.0.0.1）。"""
    monkeypatch.undo()
    monkeypatch.setattr(audit_service, "_primary_address_cache", None)
    resolved = audit_service._primary_local_address()
    assert ipaddress.ip_address(resolved).version == 4