from __future__ import annotations

import base64
from pathlib import Path

import requests

from backend.app.config import settings


class MistralClient:
    endpoint = "https://api.mistral.ai/v1/ocr"

    def ocr_image(self, image_path: Path) -> str:
        if not settings.mistral_api_key:
            raise RuntimeError("MISTRAL_API_KEY no esta configurada")
        data_url = self._image_data_url(image_path)
        response = requests.post(
            self.endpoint,
            headers={
                "Content-Type": "application/json",
                "Authorization": f"Bearer {settings.mistral_api_key}",
            },
            json={
                "model": settings.mistral_ocr_model,
                "document": {"type": "image_url", "image_url": data_url},
                "include_image_base64": False,
            },
            timeout=180,
        )
        if response.status_code == 401:
            raise RuntimeError("API Key de Mistral invalida")
        if not response.ok:
            raise RuntimeError(f"Mistral error {response.status_code}: {response.text}")
        data = response.json()
        pages = data.get("pages") or []
        markdown_pages = [page.get("markdown", "").strip() for page in pages if page.get("markdown")]
        if markdown_pages:
            return "\n\n".join(markdown_pages)
        if data.get("markdown"):
            return data["markdown"].strip()
        raise RuntimeError("Mistral OCR no devolvio Markdown")

    def _image_data_url(self, image_path: Path) -> str:
        encoded = base64.b64encode(image_path.read_bytes()).decode("ascii")
        return f"data:image/jpeg;base64,{encoded}"