from __future__ import annotations

import httpx
import pytest

from app.services import upstream_client
from app.services.upstream_client import UpstreamClient


class FakeHttpClient:
    def __init__(self, handler):
        self.handler = handler
        self.calls = []

    def request(self, method: str, url: str, **kwargs):
        request = httpx.Request(method, url)
        self.calls.append({
            "method": method,
            "path": request.url.path,
            "headers": kwargs.get("headers") or {},
            "json": kwargs.get("json"),
        })
        return self.handler(request, kwargs)

    def close(self) -> None:
        pass


def _install_fake_client(monkeypatch, handler) -> FakeHttpClient:
    fake = FakeHttpClient(handler)
    monkeypatch.setattr(upstream_client.httpx, "Client", lambda timeout=None: fake)
    return fake


def _response(request: httpx.Request, status_code: int, payload=None) -> httpx.Response:
    return httpx.Response(status_code, json=payload, request=request)


def test_sub2api_bearer_refreshes_on_401_and_retries(monkeypatch):
    updates: list[dict] = []

    def handler(request: httpx.Request, kwargs):
        if request.url.path == "/api/v1/groups/available":
            auth = kwargs["headers"].get("Authorization")
            if auth == "Bearer old-access":
                return _response(request, 401, {"detail": "expired"})
            assert auth == "Bearer new-access"
            return _response(request, 200, [{"id": "g1", "name": "G1"}])
        if request.url.path == "/api/v1/auth/refresh":
            assert kwargs["json"] == {"refresh_token": "old-refresh"}
            return _response(request, 200, {
                "access_token": "new-access",
                "refresh_token": "new-refresh",
                "expires_in": 3600,
            })
        raise AssertionError(f"unexpected request: {request.method} {request.url}")

    fake = _install_fake_client(monkeypatch, handler)
    client = UpstreamClient(
        base_url="http://sub2api.local",
        api_prefix="/api/v1",
        auth_type="bearer",
        auth_config={"token": "old-access", "refresh_token": "old-refresh"},
        on_auth_config_update=updates.append,
    )

    groups = client.get_available_groups("/groups/available")

    assert groups == [{"id": "g1", "name": "G1"}]
    assert [(c["method"], c["path"]) for c in fake.calls] == [
        ("GET", "/api/v1/groups/available"),
        ("POST", "/api/v1/auth/refresh"),
        ("GET", "/api/v1/groups/available"),
    ]
    assert updates[-1]["token"] == "new-access"
    assert updates[-1]["refresh_token"] == "new-refresh"
    assert updates[-1]["expires_in"] == 3600


def test_sub2api_bearer_without_refresh_token_does_not_refresh(monkeypatch):
    def handler(request: httpx.Request, kwargs):
        assert request.url.path == "/api/v1/groups/available"
        return _response(request, 401, {"detail": "expired"})

    fake = _install_fake_client(monkeypatch, handler)
    client = UpstreamClient(
        base_url="http://sub2api.local",
        api_prefix="/api/v1",
        auth_type="bearer",
        auth_config={"token": "old-access"},
    )

    with pytest.raises(httpx.HTTPStatusError):
        client.get_available_groups("/groups/available")

    assert [(c["method"], c["path"]) for c in fake.calls] == [
        ("GET", "/api/v1/groups/available"),
    ]


def test_non_sub2api_bearer_does_not_refresh(monkeypatch):
    def handler(request: httpx.Request, kwargs):
        assert request.url.path == "/groups/available"
        return _response(request, 401, {"detail": "expired"})

    fake = _install_fake_client(monkeypatch, handler)
    client = UpstreamClient(
        base_url="http://plain-bearer.local",
        api_prefix="",
        auth_type="bearer",
        auth_config={"token": "old-access", "refresh_token": "old-refresh"},
    )

    with pytest.raises(httpx.HTTPStatusError):
        client.get_available_groups("/groups/available")

    assert [(c["method"], c["path"]) for c in fake.calls] == [
        ("GET", "/groups/available"),
    ]


def test_login_password_saves_sub2api_refresh_token(monkeypatch):
    updates: list[dict] = []

    def handler(request: httpx.Request, kwargs):
        assert request.url.path == "/api/v1/auth/login"
        assert kwargs["json"] == {"email": "user@example.com", "password": "secret"}
        return _response(request, 200, {
            "access_token": "login-access",
            "refresh_token": "login-refresh",
            "expires_in": 1800,
        })

    _install_fake_client(monkeypatch, handler)
    client = UpstreamClient(
        base_url="http://sub2api.local",
        api_prefix="/api/v1",
        auth_type="login_password",
        auth_config={"email": "user@example.com", "password": "secret"},
        on_auth_config_update=updates.append,
    )

    client.login()

    assert client._headers()["Authorization"] == "Bearer login-access"
    assert updates[-1]["token"] == "login-access"
    assert updates[-1]["refresh_token"] == "login-refresh"
    assert updates[-1]["expires_in"] == 1800


def test_login_password_empty_prefix_defaults_to_user_api_login(monkeypatch):
    def handler(request: httpx.Request, kwargs):
        assert request.url.path == "/api/user/login"
        assert kwargs["json"] == {"username": "admin", "password": "secret"}
        return _response(request, 200, {
            "token": "nox-access",
            "user": {"id": 9},
        })

    _install_fake_client(monkeypatch, handler)
    client = UpstreamClient(
        base_url="http://nox.local",
        api_prefix="",
        auth_type="login_password",
        auth_config={"email": "admin", "password": "secret"},
    )

    client.login()

    headers = client._headers()
    assert headers["Authorization"] == "Bearer nox-access"
    assert headers["Nox-Api-User"] == "9"
    assert headers["New-Api-User"] == "9"