from __future__ import annotations

import unittest
from types import SimpleNamespace
from typing import Any

import httpx
from google.genai import errors

from javis.providers.base import (
    ChatMessage,
    CloudNetworkError,
    InvalidApiKeyError,
    InvalidProviderResponseError,
    MissingApiKeyError,
    ProviderRateLimitError,
    ProviderTimeoutError,
)
from javis.providers.gemini import GeminiProvider


class _FakeModels:
    def __init__(self, result: object) -> None:
        self.result = result
        self.call: dict[str, Any] | None = None

    def generate_content(self, **kwargs: object) -> object:
        self.call = kwargs
        if isinstance(self.result, BaseException):
            raise self.result
        return self.result


class _FakeClient:
    def __init__(self, result: object) -> None:
        self.models = _FakeModels(result)


class _ClientFactory:
    def __init__(self, result: object) -> None:
        self.client = _FakeClient(result)
        self.arguments: dict[str, Any] | None = None

    def __call__(self, **kwargs: object) -> _FakeClient:
        self.arguments = kwargs
        return self.client


def _response(text: str = "Cloud-Antwort") -> SimpleNamespace:
    return SimpleNamespace(
        text=text,
        usage_metadata=SimpleNamespace(
            prompt_token_count=12,
            candidates_token_count=7,
        ),
    )


class GeminiProviderTests(unittest.TestCase):
    def _provider(
        self, result: object, **overrides: object
    ) -> tuple[GeminiProvider, _ClientFactory]:
        factory = _ClientFactory(result)
        arguments: dict[str, object] = {
            "model": "gemini-3.6-flash",
            "api_key": "test-key-not-a-real-secret",
            "timeout_seconds": 30,
            "max_output_tokens": 1024,
            "max_retries": 1,
            "client_factory": factory,
        }
        arguments.update(overrides)
        return GeminiProvider(**arguments), factory

    def test_success_uses_bounded_sdk_configuration_and_tracks_usage(self) -> None:
        provider, factory = self._provider(_response())

        answer = provider.chat(
            [
                ChatMessage("user", "Hallo"),
                ChatMessage("assistant", "Guten Tag"),
                ChatMessage("user", "Was ist SQLite?"),
            ]
        )

        self.assertEqual(answer, "Cloud-Antwort")
        self.assertEqual(provider.last_usage.input_tokens, 12)
        self.assertEqual(provider.last_usage.output_tokens, 7)
        self.assertNotIn("test-key-not-a-real-secret", repr(factory.client.models.call))

        http_options = factory.arguments["http_options"]
        self.assertEqual(http_options.api_version, "v1")
        self.assertEqual(http_options.timeout, 30_000)
        self.assertEqual(http_options.retry_options.attempts, 2)
        self.assertNotIn(429, http_options.retry_options.http_status_codes)

        call = factory.client.models.call
        self.assertEqual(call["model"], "gemini-3.6-flash")
        self.assertEqual([content.role for content in call["contents"]], ["user", "model", "user"])
        self.assertEqual(call["config"].max_output_tokens, 1024)
        self.assertIsNone(call["config"].tools)

    def test_missing_key_stops_before_client_creation(self) -> None:
        factory = _ClientFactory(_response())

        with self.assertRaises(MissingApiKeyError):
            GeminiProvider(
                model="gemini-3.6-flash",
                api_key=None,
                timeout_seconds=30,
                max_output_tokens=1024,
                max_retries=1,
                client_factory=factory,
            )

        self.assertIsNone(factory.arguments)

    def test_invalid_key_is_sanitized(self) -> None:
        provider, _ = self._provider(
            errors.ClientError(
                401,
                {"message": "rejected test-key-not-a-real-secret"},
            )
        )

        with self.assertRaisesRegex(InvalidApiKeyError, "wurde abgelehnt") as raised:
            provider.chat([ChatMessage("user", "Hallo")])

        self.assertNotIn("test-key-not-a-real-secret", str(raised.exception))

    def test_rate_limit_is_a_distinct_fallback_signal(self) -> None:
        provider, _ = self._provider(errors.ClientError(429, {"message": "quota"}))

        with self.assertRaises(ProviderRateLimitError):
            provider.chat([ChatMessage("user", "Was ist Python?")])

    def test_network_failure_is_a_distinct_fallback_signal(self) -> None:
        request = httpx.Request("POST", "https://example.invalid")
        provider, _ = self._provider(httpx.ConnectError("offline", request=request))

        with self.assertRaises(CloudNetworkError):
            provider.chat([ChatMessage("user", "Was ist Python?")])

    def test_timeout_is_a_distinct_fallback_signal(self) -> None:
        request = httpx.Request("POST", "https://example.invalid")
        provider, _ = self._provider(httpx.ReadTimeout("timeout", request=request))

        with self.assertRaises(ProviderTimeoutError):
            provider.chat([ChatMessage("user", "Was ist Python?")])

    def test_empty_response_is_rejected(self) -> None:
        provider, _ = self._provider(_response("  "))

        with self.assertRaises(InvalidProviderResponseError):
            provider.chat([ChatMessage("user", "Was ist Python?")])

    def test_more_than_one_retry_is_rejected(self) -> None:
        with self.assertRaises(ValueError):
            self._provider(_response(), max_retries=2)


if __name__ == "__main__":
    unittest.main()