import asyncio
import logging
import os
from typing import Any, Dict, List, Optional
from django.conf import settings
from mcp_agent.mcp_client import MCPClient
from .models import AgentModel

logger = logging.getLogger(__name__)

# Get reference to the base model cache directory
try:
    from mcp_agent.mcp_server import BASE_MODEL_CACHE_DIR
    BASE_MODEL_CACHE = BASE_MODEL_CACHE_DIR
except ImportError:
    # Fallback: construct the path manually
    project_root = os.path.dirname(os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
    BASE_MODEL_CACHE = os.path.join(project_root, "model", "base-model")

logger.info(f"Base model cache directory reference: {BASE_MODEL_CACHE}")

async def _call_mcp(tool: str, arguments: Dict[str, Any]) -> Dict[str, Any]:
    """Internal async helper to call the MCP HTTP bridge via MCPClient."""
    server_url = getattr(settings, "MCP_AGENT_URL")
    client = MCPClient(server_url)
    logger.info(f"MCP: Calling tool '{tool}' on {server_url}")
    logger.debug(f"MCP: Arguments for '{tool}': {arguments}")
    try:
        resp = await client.send(tool, arguments)
        logger.info(f"MCP: Tool '{tool}' completed successfully")
        logger.debug(f"MCP: Response from '{tool}': {resp}")
        return resp
    except Exception as e:
        logger.error(f"MCP: Tool '{tool}' failed with error: {str(e)}")
        raise
    finally:
        await client.close()


def fine_tune_model(
    base_model: str,
    training_files: List[str],
    hyperparams: Dict[str, Any],
    name: str,
    version: str,
) -> Dict[str, Any]:
    """Synchronously request a fine-tune run on the MCP server.

    Expects the MCP tool `fine_tune` to accept: {base_model, training_files, hyperparams, name, version}
    and to return a JSON-like dict containing at least `status` and on success `model_path` and `version`.
    """
    logger.info(f"Fine-tuning model: name={name}, version={version}, base_model={base_model}")
    logger.info(f"Training files count: {len(training_files)}")
    logger.debug(f"Training files: {training_files}")
    try:
        logger.info("Calling MCP fine_tune tool...")
        result = asyncio.run(_call_mcp("fine_tune", {
            "base_model": base_model,
            "training_files": training_files,
            "hyperparams": hyperparams,
            "name": name,
            "version": version,
        }))
        logger.info(f"Fine-tune completed: status={result.get('status')}")
        logger.debug(f"Fine-tune result: {result}")
        return result
    except Exception as e:
        error_msg = str(e) if str(e) else f"Unknown error: {type(e).__name__}"
        logger.error(f"Fine-tune failed: {error_msg}", exc_info=True)
        # Return a failed response instead of raising
        return {
            "status": "failed",
            "error": error_msg,
            "error_type": type(e).__name__,
        }


def load_model_for_inference(model_path: str) -> Dict[str, Any]:
    """Tell the MCP server to load a model into memory/serving for inference.

    Expects the MCP tool `load_model` with {model_path} returning status info.
    """
    logger.info(f"Loading model for inference: {model_path}")
    try:
        result = asyncio.run(_call_mcp("load_model", {"model_path": model_path}))
        logger.info(f"Model loaded successfully")
        return result
    except Exception as e:
        logger.error(f"Failed to load model: {str(e)}", exc_info=True)
        raise


def infer_with_model(model_path: str, prompt: str, options: Optional[Dict[str, Any]] = None) -> Dict[str, Any]:
    """Request inference from the MCP server using a previously fine-tuned model.

    Calls the MCP tool `infer` with {model_path, prompt, options}.
    """
    logger.info(f"Running inference with model: {model_path}")
    logger.debug(f"Prompt length: {len(prompt)} characters")
    logger.debug(f"Inference options: {options}")
    try:
        result = asyncio.run(_call_mcp("infer", {"model_path": model_path, "prompt": prompt, "options": options or {}}))
        logger.info(f"Inference completed successfully")
        logger.debug(f"Inference result keys: {list(result.keys()) if isinstance(result, dict) else 'not a dict'}")
        return result
    except Exception as e:
        logger.error(f"Inference failed: {str(e)}", exc_info=True)
        raise


def register_model_in_db(name: str, version: str, model_path: str) -> AgentModel:
    """Convenience DB helper: create and return an AgentModel record.

    NOTE: migrations are required after the model field change prior to using this in production.
    """
    return AgentModel.objects.create(name=name, version=version, path=model_path)