"""Tests for Gemini legacy Standard-key 401 guidance.

Google began rejecting unrestricted legacy "Standard" Google Cloud API keys
on the Gemini API on June 19, 2026 (all Standard keys stop working in
September 2026). The rejection is a 401 whose message misleadingly tells the
user to supply an OAuth 2 access token. ``gemini_http_error`` must append
actionable key-migration guidance on that shape — and ONLY that shape.

Port of Kilo-Org/kilocode#12162, adapted to Hermes' GeminiAPIError surface.
"""
from __future__ import annotations

import json
from unittest.mock import MagicMock

from agent.gemini_native_adapter import (
    gemini_http_error,
    is_standard_key_auth_error,
)


GOOGLE_AUTH_MESSAGE = (
    "Request had invalid authentication credentials. Expected OAuth 2 access "
    "token, login cookie or other valid authentication credential. See "
    "https://developers.google.com/identity/sign-in/web/devconsole-project."
)

GUIDANCE_MARKER = "rejected this API key's type"


def _mock_response(status: int, body: str, headers: dict | None = None) -> MagicMock:
    resp = MagicMock()
    resp.status_code = status
    resp.headers = headers or {}
    resp.text = body
    return resp


def _google_error_body(
    status_code: int,
    message: str,
    status: str = "UNAUTHENTICATED",
    reason: str | None = None,
) -> str:
    err: dict = {"code": status_code, "message": message, "status": status}
    if reason is not None:
        err["details"] = [
            {
                "@type": "type.googleapis.com/google.rpc.ErrorInfo",
                "reason": reason,
                "domain": "googleapis.com",
                "metadata": {"service": "generativelanguage.googleapis.com"},
            }
        ]
    return json.dumps({"error": err})


class TestIsStandardKeyAuthError:
    def test_matches_oauth_message_without_reason(self):
        assert is_standard_key_auth_error(401, GOOGLE_AUTH_MESSAGE)

    def test_matches_error_info_reason_alone(self):
        assert is_standard_key_auth_error(
            401, "some other text", "ACCESS_TOKEN_TYPE_UNSUPPORTED"
        )

    def test_rejects_non_401_status(self):
        assert not is_standard_key_auth_error(400, GOOGLE_AUTH_MESSAGE)
        assert not is_standard_key_auth_error(403, GOOGLE_AUTH_MESSAGE)

    def test_rejects_plain_invalid_key(self):
        assert not is_standard_key_auth_error(
            401, "API key not valid. Please pass a valid API key.", "API_KEY_INVALID"
        )

    def test_empty_message_is_safe(self):
        assert not is_standard_key_auth_error(401, "")
        assert not is_standard_key_auth_error(401, None)  # type: ignore[arg-type]


class TestGeminiHttpErrorGuidance:
    def test_guidance_appended_on_oauth_401_with_reason(self):
        body = _google_error_body(
            401, GOOGLE_AUTH_MESSAGE, reason="ACCESS_TOKEN_TYPE_UNSUPPORTED"
        )
        err = gemini_http_error(_mock_response(401, body))
        text = str(err)
        assert GUIDANCE_MARKER in text
        assert "aistudio.google.com/api-keys" in text
        assert "ai.google.dev/gemini-api/docs/api-key" in text
        assert err.code == "gemini_unauthorized"

    def test_guidance_appended_on_oauth_401_without_reason(self):
        body = _google_error_body(401, GOOGLE_AUTH_MESSAGE)
        err = gemini_http_error(_mock_response(401, body))
        assert GUIDANCE_MARKER in str(err)

    def test_original_google_message_preserved(self):
        body = _google_error_body(401, GOOGLE_AUTH_MESSAGE)
        err = gemini_http_error(_mock_response(401, body))
        assert "Expected OAuth 2 access token" in str(err)

    def test_plain_invalid_key_401_gets_no_guidance(self):
        body = _google_error_body(
            401,
            "API key not valid. Please pass a valid API key.",
            reason="API_KEY_INVALID",
        )
        err = gemini_http_error(_mock_response(401, body))
        assert GUIDANCE_MARKER not in str(err)

    def test_403_with_oauth_message_gets_no_guidance(self):
        body = _google_error_body(403, GOOGLE_AUTH_MESSAGE, status="PERMISSION_DENIED")
        err = gemini_http_error(_mock_response(403, body))
        assert GUIDANCE_MARKER not in str(err)

    def test_free_tier_429_unaffected(self):
        body = json.dumps(
            {
                "error": {
                    "code": 429,
                    "message": (
                        "Quota exceeded for metric: generativelanguage.googleapis.com/"
                        "generate_content_free_tier_requests, limit: 20"
                    ),
                }
            }
        )
        err = gemini_http_error(_mock_response(429, body))
        text = str(err)
        assert "free tier" in text
        assert GUIDANCE_MARKER not in text

    def test_unparseable_401_body_with_oauth_text_still_matches(self):
        # err_message empty -> falls back to raw body_text scan.
        err = gemini_http_error(_mock_response(401, GOOGLE_AUTH_MESSAGE))
        assert GUIDANCE_MARKER in str(err)


class TestSummarizerPreservesGuidance:
    """_summarize_api_error must not strip adapter-composed guidance.

    GeminiAPIError carries ``.response``; without the GeminiAPIError branch,
    the summarizer re-extracts the raw body's error.message (capped at 300
    chars), silently discarding both the Standard-key 401 guidance and the
    pre-existing free-tier 429 guidance.
    """

    def test_standard_key_guidance_survives_summarizer(self):
        from run_agent import AIAgent

        body = _google_error_body(
            401, GOOGLE_AUTH_MESSAGE, reason="ACCESS_TOKEN_TYPE_UNSUPPORTED"
        )
        err = gemini_http_error(_mock_response(401, body))
        summary = AIAgent._summarize_api_error(err)
        assert GUIDANCE_MARKER in summary
        assert "aistudio.google.com/api-keys" in summary

    def test_free_tier_guidance_survives_summarizer(self):
        from run_agent import AIAgent

        body = json.dumps(
            {
                "error": {
                    "code": 429,
                    "message": (
                        "Quota exceeded for metric: "
                        "generativelanguage.googleapis.com/"
                        "generate_content_free_tier_requests, limit: 20"
                    ),
                }
            }
        )
        err = gemini_http_error(_mock_response(429, body))
        summary = AIAgent._summarize_api_error(err)
        assert "free tier" in summary

    def test_non_gemini_errors_keep_response_body_extraction(self):
        from types import SimpleNamespace

        from run_agent import AIAgent

        err = Exception("")
        err.status_code = 400
        err.body = {}
        err.response = SimpleNamespace(
            text='{"error": {"message": "model `foo` does not exist"}}'
        )
        summary = AIAgent._summarize_api_error(err)
        assert "model `foo` does not exist" in summary