"""
Azure OpenAI GPT-4o Vision validator for thumbnail orientation.
"""
import base64
import logging
import uuid
from pathlib import Path

logger = logging.getLogger(__name__)

VALIDATION_PROMPT = """You are a quality control expert for Schaeffler bearing product catalog images.

Analyze this thumbnail of a bearing/mechanical component and evaluate:
1. Is the component orientation correct for a standard product catalog? (typically isometric view, 30° elevation, 45° rotation)
2. Are the key features visible? (rolling elements, rings, cage if present)
3. Does it match standard Schaeffler catalog angle conventions?

Respond in JSON with exactly these fields:
{
  "passed": true/false,
  "confidence": 0.0-1.0,
  "feedback": "Brief explanation",
  "suggested_rotation": "Description of recommended adjustment if needed"
}"""


def validate_thumbnail(order_item_id: str, tenant_config: dict | None = None) -> dict:
    """
    Validate thumbnail orientation using Azure GPT-4o Vision.
    Updates the order_item AI validation fields in DB.

    If tenant_config is provided and tenant_config["ai_enabled"] is True,
    the tenant's own Azure credentials are used instead of global settings.
    """
    from app.config import settings
    from sqlalchemy import create_engine
    from sqlalchemy.orm import Session
    from app.models.order_item import OrderItem, AIValidationStatus

    engine = create_engine(settings.database_url_sync)
    with Session(engine) as session:
        item = session.get(OrderItem, uuid.UUID(order_item_id))
        if not item:
            logger.error(f"OrderItem not found: {order_item_id}")
            return {}

        item.ai_validation_status = AIValidationStatus.pending
        session.commit()

        try:
            result = _call_azure_vision(item.thumbnail_path, settings, tenant_config)
            item.ai_validation_status = AIValidationStatus.completed
            item.ai_validation_result = result
        except Exception as exc:
            logger.error(f"AI validation failed for {order_item_id}: {exc}")
            item.ai_validation_status = AIValidationStatus.failed
            item.ai_validation_result = {"error": str(exc)}
            result = {}

        session.commit()
    return result


def _call_azure_vision(
    thumbnail_path: str | None,
    settings,
    tenant_config: dict | None = None,
) -> dict:
    """Call Azure OpenAI GPT-4o with a base64-encoded thumbnail.

    Credential resolution order:
    1. tenant_config (if provided and ai_enabled=True)
    2. Global settings (azure_openai_* env vars)
    """
    import json

    # Resolve credentials from tenant config or global settings
    if tenant_config and tenant_config.get("ai_enabled"):
        api_key = tenant_config.get("ai_api_key") or settings.azure_openai_api_key
        endpoint = tenant_config.get("ai_endpoint") or settings.azure_openai_endpoint
        deployment = tenant_config.get("ai_deployment") or settings.azure_openai_deployment
        api_version = tenant_config.get("ai_api_version") or settings.azure_openai_api_version
        max_tokens = int(tenant_config.get("ai_max_tokens", 500))
        temperature = float(tenant_config.get("ai_temperature", 0.1))
        prompt = tenant_config.get("ai_validation_prompt") or VALIDATION_PROMPT
    else:
        api_key = settings.azure_openai_api_key
        endpoint = settings.azure_openai_endpoint
        deployment = settings.azure_openai_deployment
        api_version = settings.azure_openai_api_version
        max_tokens = 500
        temperature = 0.1
        prompt = VALIDATION_PROMPT

    if not api_key or not endpoint:
        raise ValueError("Azure OpenAI credentials not configured")

    if not thumbnail_path or not Path(thumbnail_path).exists():
        raise FileNotFoundError(f"Thumbnail not found: {thumbnail_path}")

    try:
        from openai import AzureOpenAI

        client = AzureOpenAI(
            api_key=api_key,
            azure_endpoint=endpoint,
            api_version=api_version,
        )

        with open(thumbnail_path, "rb") as f:
            image_b64 = base64.b64encode(f.read()).decode("utf-8")

        response = client.chat.completions.create(
            model=deployment,
            messages=[
                {
                    "role": "user",
                    "content": [
                        {"type": "text", "text": prompt},
                        {
                            "type": "image_url",
                            "image_url": {"url": f"data:image/png;base64,{image_b64}"},
                        },
                    ],
                }
            ],
            max_tokens=max_tokens,
            temperature=temperature,
        )

        content = response.choices[0].message.content or ""
        # Extract JSON from response
        start = content.find("{")
        end = content.rfind("}") + 1
        if start >= 0 and end > start:
            return json.loads(content[start:end])
        return {"passed": False, "confidence": 0.0, "feedback": content, "suggested_rotation": ""}

    except Exception as exc:
        raise RuntimeError(f"Azure OpenAI call failed: {exc}") from exc