import base64
import logging
import anthropic

logger = logging.getLogger(__name__)

PROMPT = (
    "Briefly describe what's happening in this security camera image in 1-2 sentences. "
    "Focus on the people, vehicles, or animals and their activity. Be concise."
)


def analyze_snapshot(client: anthropic.Anthropic, image_bytes: bytes) -> str | None:
    """Send a snapshot to Claude Haiku for description. Returns None on failure."""
    try:
        b64 = base64.standard_b64encode(image_bytes).decode("utf-8")
        response = client.messages.create(
            model="claude-haiku-4-5-20251001",
            max_tokens=150,
            messages=[
                {
                    "role": "user",
                    "content": [
                        {
                            "type": "image",
                            "source": {
                                "type": "base64",
                                "media_type": "image/jpeg",
                                "data": b64,
                            },
                        },
                        {"type": "text", "text": PROMPT},
                    ],
                }
            ],
        )
        description = response.content[0].text.strip()
        logger.info("Vision analysis complete: %d chars", len(description))
        return description
    except Exception:
        logger.exception("Claude Vision API failed")
        return None