from unittest.mock import MagicMock, patch

from app.services.wechat_mini_auth import get_unlimited_wxacode, WechatMiniAuthError


def test_get_unlimited_wxacode_returns_png_bytes():
    token_resp = MagicMock()
    token_resp.raise_for_status = MagicMock()
    token_resp.json.return_value = {"access_token": "tok"}

    code_resp = MagicMock()
    code_resp.raise_for_status = MagicMock()
    code_resp.headers = {"Content-Type": "image/jpeg"}
    code_resp.content = b"\xff\xd8fake"

    with patch("app.services.wechat_mini_auth._require_mini_credentials", return_value=("app", "sec")):
        with patch("app.services.wechat_mini_auth.httpx.Client") as Client:
            client = MagicMock()
            Client.return_value.__enter__.return_value = client
            client.get.return_value = token_resp
            client.post.return_value = code_resp
            raw = get_unlimited_wxacode(scene="abc", page="pages/login/web-qr/index")
    assert raw.startswith(b"\xff\xd8")


def test_get_unlimited_wxacode_json_error():
    token_resp = MagicMock()
    token_resp.raise_for_status = MagicMock()
    token_resp.json.return_value = {"access_token": "tok"}

    code_resp = MagicMock()
    code_resp.raise_for_status = MagicMock()
    code_resp.headers = {"Content-Type": "application/json"}
    code_resp.content = b'{"errcode":40001,"errmsg":"fail"}'
    code_resp.json.return_value = {"errcode": 40001, "errmsg": "fail"}

    with patch("app.services.wechat_mini_auth._require_mini_credentials", return_value=("app", "sec")):
        with patch("app.services.wechat_mini_auth.httpx.Client") as Client:
            client = MagicMock()
            Client.return_value.__enter__.return_value = client
            client.get.return_value = token_resp
            client.post.return_value = code_resp
            try:
                get_unlimited_wxacode(scene="abc", page="pages/login/web-qr/index")
                assert False, "expected error"
            except WechatMiniAuthError:
                pass