import asyncio

from google import genai
from google.genai import types as genai_types

from ...storage import pcm_to_wav

VOICE_BY_LANGUAGE: dict[str, str] = {
    "fr": "Kore",
    "es": "Charon",
    "it": "Aoede",
    "de": "Fenrir",
    "en": "Kore",
}


class GeminiClient():
    """Communicate with Google's Gemini LLM"""
    def __init__(self, api_key: str):
        self._api_key = api_key

    def get_voice_by_language(self, target_language: str) -> str:
        possible_voice = VOICE_BY_LANGUAGE.get(target_language)

        if not possible_voice:
            raise ValueError(f"No voice found for language: {target_language}")

        return possible_voice


    async def generate_audio(self, text: str, voice: str) -> bytes:
        """Generate TTS audio and return WAV bytes."""
        def _call() -> bytes:
            client = genai.Client(api_key=self._api_key)
            response = client.models.generate_content(
                model="gemini-2.5-flash-preview-tts",
                contents=text,
                config=genai_types.GenerateContentConfig(
                    response_modalities=["AUDIO"],
                    speech_config=genai_types.SpeechConfig(
                        voice_config=genai_types.VoiceConfig(
                            prebuilt_voice_config=genai_types.PrebuiltVoiceConfig(
                                voice_name=voice,
                            )
                        )
                    ),
                ),
            )
            pcm_data = response.candidates[0].content.parts[0].inline_data.data
            return pcm_to_wav(pcm_data)

        return await asyncio.to_thread(_call)