import os
import time
import multiprocessing
from typing import Optional
from fastapi import APIRouter, HTTPException
from pydantic import BaseModel

from utils import (
    setup_system_optimizations
)

from embedding import get_model_manager
from pydantic import BaseModel
import logging

logger = logging.getLogger('app')

router = APIRouter()


class EncodeRequest(BaseModel):
    texts: list[str] 
    batch_size: int = 32


class EncodeResponse(BaseModel):
    success: bool
    embeddings: list[list[float]]
    shape: list[int]
    processing_time: float
    total_texts: int
    error: Optional[str] = None


# Initialize system optimization settings
logger.info("Initializing system optimizations...")
system_optimizer = setup_system_optimizations()


logger.info("System optimization initialization completed")


@router.get("/api/health")
async def health_check():
    """Health check endpoint"""
    return {"message": "Database Assistant API is running"}


@router.get("/api/v1/system/performance")
async def get_performance_stats():
    """Get system performance statistics."""
    try:
        # Get connection pool statistics (simplified)
        pool_stats = {
            "connection_pool": "active",
            "max_connections_per_host": 100,
            "max_connections_total": 500,
            "keepalive_timeout": 30
        }
        
        # Get file cache statistics
        file_cache_stats = {
            "cache_size": len(file_cache._cache) if hasattr(file_cache, '_cache') else 0,
            "max_cache_size": file_cache.cache_size if hasattr(file_cache, 'cache_size') else 1000,
            "ttl": file_cache.ttl if hasattr(file_cache, 'ttl') else 300
        }
        
        # System resource information
        try:
            import psutil
            system_stats = {
                "cpu_count": multiprocessing.cpu_count(),
                "memory_total_gb": round(psutil.virtual_memory().total / (1024**3), 2),
                "memory_available_gb": round(psutil.virtual_memory().available / (1024**3), 2),
                "memory_percent": psutil.virtual_memory().percent,
                "disk_usage_percent": psutil.disk_usage('/').percent
            }
        except ImportError:
            system_stats = {
                "cpu_count": multiprocessing.cpu_count(),
                "memory_info": "psutil not available"
            }
        
        return {
            "success": True,
            "timestamp": int(time.time()),
            "performance": {
                "connection_pool": pool_stats,
                "file_cache": file_cache_stats,
                "system": system_stats
            }
        }
        
    except Exception as e:
        logger.error(f"Error getting performance stats: {str(e)}")
        raise HTTPException(status_code=500, detail=f"Failed to get performance statistics: {str(e)}")



@router.post("/api/v1/embedding/encode", response_model=EncodeResponse)
async def encode_texts(request: EncodeRequest):
    """
    Text encoding API.

    Args:
        request: Encoding request containing texts and batch_size

    Returns:
        Encoding result
    """
    try:
        model_manager = get_model_manager()

        if not request.texts:
            return EncodeResponse(
                success=False,
                embeddings=[],
                shape=[0, 0],
                processing_time=0.0,
                total_texts=0,
                error="texts cannot be empty"
            )

        start_time = time.time()

        # Encode texts with the model manager
        embeddings = await model_manager.encode_texts(
            request.texts,
            batch_size=request.batch_size
        )

        processing_time = time.time() - start_time

        # Convert to list format
        embeddings_list = embeddings.tolist()

        return EncodeResponse(
            success=True,
            embeddings=embeddings_list,
            shape=list(embeddings.shape),
            processing_time=processing_time,
            total_texts=len(request.texts)
        )

    except Exception as e:

        logger.error(f"Text encoding API error: {e}")
        return EncodeResponse(
            success=False,
            embeddings=[],
            shape=[0, 0],
            processing_time=0.0,
            total_texts=len(request.texts) if request else 0,
            error=f"Encoding failed: {str(e)}"
        )