"""Tests for transcription.providers.openrouter."""

import asyncio
import logging
from types import SimpleNamespace
from typing import cast

import pytest
from openrouter import OpenRouter

from transcription.config import Settings
from transcription.providers.base import ProviderError
from transcription.providers.base import ProviderResponseError
from transcription.providers.openrouter import DEFAULT_OPENROUTER_MODEL
from transcription.providers.openrouter import OpenRouterTranscriptionProvider


class _FakeChat:
    def __init__(self, response=None, error: BaseException | None = None):
        self._response = response
        self._error = error
        self.calls = []

    async def send_async(self, **kwargs):
        self.calls.append(kwargs)
        if self._error:
            raise self._error
        return self._response


class _FakeClient:
    def __init__(self, response=None, error: BaseException | None = None):
        self.chat = _FakeChat(response=response, error=error)


def _fake_client(response=None, error: BaseException | None = None) -> OpenRouter:
    """Return a stub typed as the SDK client the provider declares."""
    return cast("OpenRouter", _FakeClient(response=response, error=error))


@pytest.mark.unit
class TestOpenRouterProviderInit:
    """Verify OpenRouter provider initialization behavior."""

    def test_model_falls_back_to_default_when_unset(self):
        """Provider uses adapter default model when provider_model is None."""
        settings = Settings(openrouter_api_key="test-key", provider_model=None)
        provider = OpenRouterTranscriptionProvider(settings=settings, client=_fake_client())
        assert provider.model == DEFAULT_OPENROUTER_MODEL

    def test_model_uses_configured_value(self):
        """Provider uses configured provider_model when present."""
        settings = Settings(openrouter_api_key="test-key", provider_model="vendor/custom-model")
        provider = OpenRouterTranscriptionProvider(settings=settings, client=_fake_client())
        assert provider.model == "vendor/custom-model"


@pytest.mark.unit
class TestOpenRouterProviderTranscribe:
    """Verify OpenRouter request construction and response parsing."""

    @pytest.mark.asyncio
    async def test_includes_optional_referer_and_title_when_set(self):
        """Transcribe sends app attribution fields when configured."""
        response = {"model": "vendor/model-a", "choices": [{"message": {"content": "Transcript text"}}]}
        client = _FakeClient(response=response)
        settings = Settings(
            openrouter_api_key="test-key",
            openrouter_http_referer="https://example.test",
            openrouter_app_title="Transcription App",
        )
        provider = OpenRouterTranscriptionProvider(settings=settings, client=cast("OpenRouter", client))

        result = await provider.transcribe(
            prompt_text="Prompt body",
            image_bytes=b"img-bytes",
            mime_type="image/png",
        )

        send_call = client.chat.calls[0]
        assert send_call["http_referer"] == "https://example.test"
        assert send_call["x_open_router_title"] == "Transcription App"
        assert result.text == "Transcript text"

    @pytest.mark.asyncio
    async def test_includes_temperature_and_top_p_when_provided(self):
        """Transcribe passes configured sampling parameters through to OpenRouter."""
        response = {"model": "vendor/model-a", "choices": [{"message": {"content": "Transcript text"}}]}
        client = _FakeClient(response=response)
        provider = OpenRouterTranscriptionProvider(
            settings=Settings(openrouter_api_key="test-key"),
            client=cast("OpenRouter", client),
        )

        result = await provider.transcribe(
            prompt_text="Prompt body",
            image_bytes=b"img-bytes",
            mime_type="image/png",
            temperature=0.2,
            top_p=0.85,
        )

        send_call = client.chat.calls[0]
        assert send_call["temperature"] == 0.2
        assert send_call["top_p"] == 0.85
        assert result.temperature == 0.2
        assert result.top_p == 0.85

    @pytest.mark.asyncio
    async def test_parses_successful_response_text(self):
        """Transcribe returns normalized text from a valid response payload."""
        response = {
            "model": "vendor/model-b",
            "choices": [
                {
                    "message": {"content": [{"text": "Line 1"}, {"text": "Line 2"}]},
                    "finish_reason": "stop",
                }
            ],
            "usage": {"prompt_tokens": 10, "completion_tokens": 25, "total_tokens": 35},
        }
        provider = OpenRouterTranscriptionProvider(
            settings=Settings(openrouter_api_key="test-key"),
            client=_fake_client(response=response),
        )

        result = await provider.transcribe(
            prompt_text="Prompt body",
            image_bytes=b"img-bytes",
            mime_type="image/jpeg",
        )

        assert result.text == "Line 1\nLine 2"
        assert result.provider == "openrouter"
        assert result.prompt_name is None
        assert result.model == "vendor/model-b"
        assert result.metadata_payload() == {
            "finish_reason": "stop",
            "usage": {"input_tokens": 10, "output_tokens": 25, "total_tokens": 35},
        }
        assert result.raw_api_response == response

    @pytest.mark.asyncio
    async def test_maps_sdk_exception_to_provider_error(self):
        """Transcribe converts SDK failures to ProviderError."""
        provider = OpenRouterTranscriptionProvider(
            settings=Settings(openrouter_api_key="test-key"),
            client=_fake_client(error=RuntimeError("network down")),
        )

        with pytest.raises(ProviderError):
            await provider.transcribe(
                prompt_text="Prompt body",
                image_bytes=b"img-bytes",
                mime_type="image/png",
            )

    @pytest.mark.asyncio
    async def test_preserves_caller_cancellation(self):
        """Caller and shutdown cancellation must not be relabeled as a timeout."""
        provider = OpenRouterTranscriptionProvider(
            settings=Settings(openrouter_api_key="test-key"),
            client=_fake_client(error=asyncio.CancelledError()),
        )

        with pytest.raises(asyncio.CancelledError):
            await provider.transcribe(
                prompt_text="Prompt body",
                image_bytes=b"img-bytes",
                mime_type="image/png",
            )

    @pytest.mark.asyncio
    async def test_sends_pdf_as_file_content(self):
        """PDF payloads use OpenRouter's file content contract."""
        response = {"model": "vendor/model-a", "choices": [{"message": {"content": "Transcript text"}}]}
        client = _FakeClient(response=response)
        provider = OpenRouterTranscriptionProvider(
            settings=Settings(openrouter_api_key="test-key"),
            client=cast("OpenRouter", client),
        )

        await provider.transcribe(
            prompt_text="Prompt body",
            image_bytes=b"pdf-bytes",
            mime_type="application/pdf",
        )

        content = client.chat.calls[0]["messages"][0]["content"]
        assert content[1]["type"] == "file"
        assert content[1]["file"]["filename"] == "source.pdf"
        assert content[1]["file"]["file_data"].startswith("data:application/pdf;base64,")

    @pytest.mark.asyncio
    async def test_raises_on_empty_or_invalid_response(self):
        """Transcribe raises ProviderResponseError for missing completion text."""
        provider = OpenRouterTranscriptionProvider(
            settings=Settings(openrouter_api_key="test-key"),
            client=_fake_client(response=SimpleNamespace(choices=[])),
        )

        with pytest.raises(ProviderResponseError):
            await provider.transcribe(
                prompt_text="Prompt body",
                image_bytes=b"img-bytes",
                mime_type="image/png",
            )

    @pytest.mark.asyncio
    async def test_ignores_invalid_token_metadata_without_discarding_transcript(self):
        response = {
            "model": "vendor/model-a",
            "choices": [{"message": {"content": "Transcript text"}}],
            "usage": {"prompt_tokens": -1},
        }
        provider = OpenRouterTranscriptionProvider(
            settings=Settings(openrouter_api_key="test-key"),
            client=_fake_client(response=response),
        )

        result = await provider.transcribe(
            prompt_text="Prompt body",
            image_bytes=b"img-bytes",
            mime_type="image/png",
        )

        assert result.text == "Transcript text"
        assert result.metadata_payload() is None
        assert result.raw_api_response == response

    @pytest.mark.asyncio
    async def test_logs_when_request_manifest_is_omitted_without_source_reference(self, caplog):
        response = {"model": "vendor/model-a", "choices": [{"message": {"content": "Transcript text"}}]}
        provider = OpenRouterTranscriptionProvider(
            settings=Settings(openrouter_api_key="test-key"),
            client=_fake_client(response=response),
        )

        with caplog.at_level(logging.WARNING):
            result = await provider.transcribe(
                prompt_text="Prompt body",
                image_bytes=b"img-bytes",
                mime_type="image/png",
            )

        assert result.request_manifest is None
        assert "request manifest omitted" in caplog.text.lower()