"""Custom OpenAI-compatible vision provider."""

import base64
from openai import AsyncOpenAI

from app.config import get_settings
from app.schemas.transaction import TransactionExtractItem
from app.services.llm.base import BaseLLMProvider
from app.prompts.extract_transaction import get_extract_messages
from app.services.llm.openai_vision import _parse_json_array


class CustomOpenAICompatibleProvider(BaseLLMProvider):
    async def extract_from_image(self, image_bytes: bytes) -> list[TransactionExtractItem]:
        settings = get_settings()
        if not settings.custom_openai_api_key:
            raise ValueError("CUSTOM_OPENAI_API_KEY is not set")
        if not settings.custom_openai_base_url:
            raise ValueError("CUSTOM_OPENAI_BASE_URL is not set")
        client = AsyncOpenAI(
            api_key=settings.custom_openai_api_key,
            base_url=settings.custom_openai_base_url,
        )
        b64 = base64.standard_b64encode(image_bytes).decode("ascii")
        messages = get_extract_messages(b64)
        response = await client.chat.completions.create(
            model=settings.custom_openai_model,
            messages=messages,
            max_tokens=4096,
        )
        text = response.choices[0].message.content or "[]"
        return _parse_json_array(text)