app/routes.py

from fastapi import APIRouter, HTTPException
from pydantic import BaseModel
from typing import Optional, List, Dict, Union
from .api import LLMApi
from utils.logging import setup_logger
from utils.helpers import get_system_info, format_memory_size
from utils.validation import validate_model_path
import psutil
from pathlib import Path

router = APIRouter()
logger = None
api = None
config = None

def init_router(config_dict: dict):
    """Initialize router with config and LLM API instance"""
    global logger, api, config
    config = config_dict
    logger = setup_logger(config, "api_routes")
    api = LLMApi(config)
    logger.info("Router initialized with LLM API instance")

class GenerateRequest(BaseModel):
    prompt: str
    system_message: Optional[str] = None
    max_new_tokens: Optional[int] = None

class EmbeddingRequest(BaseModel):
    text: str

class EmbeddingResponse(BaseModel):
    embedding: List[float]
    dimension: int

class SystemStatusResponse(BaseModel):
    """Pydantic model for system status response"""
    cpu: Optional[Dict[str, Union[float, str]]] = None
    memory: Optional[Dict[str, Union[float, str]]] = None
    gpu: Optional[Dict[str, Union[bool, str, float]]] = None
    storage: Optional[Dict[str, str]] = None
    model: Optional[Dict[str, Union[bool, str]]] = None

class ValidationResponse(BaseModel):
    config_validation: Dict[str, bool]
    model_validation: Dict[str, bool]
    folder_validation: Dict[str, bool]
    overall_status: str
    issues: List[str]

@router.get("/system/validate",
            response_model=ValidationResponse,
            summary="Validate System Configuration",
            description="Validates system configuration, folders, and model setup")
async def validate_system():
    """
    Validates:
    - Configuration parameters
    - Model setup
    - Folder structure
    - Required permissions
    """
    logger.info("Starting system validation")
    issues = []

    # Validate configuration
    try:
        config_status = {
            "has_required_fields": True,  # Check if all required config fields exist
            "valid_paths": True,          # Check if paths are valid
            "valid_parameters": True      # Check if parameters are within acceptable ranges
        }

        # Example validation checks
        if not api.models_path.exists():
            config_status["valid_paths"] = False
            issues.append("Models directory does not exist")

        if api.temperature < 0 or api.temperature > 2:
            config_status["valid_parameters"] = False
            issues.append("Temperature parameter out of valid range (0-2)")

    except Exception as e:
        logger.error(f"Configuration validation failed: {str(e)}")
        config_status = {"error": str(e)}
        issues.append(f"Config validation error: {str(e)}")

    # Validate model setup
    try:
        model_status = {
            "model_files_exist": False,
            "model_loadable": False,
            "tokenizer_valid": False
        }

        if api.model_name:
            model_path = api.models_path / api.model_name.split('/')[-1]
            model_status["model_files_exist"] = validate_model_path(model_path)

            if not model_status["model_files_exist"]:
                issues.append("Model files are missing or incomplete")

            model_status["model_loadable"] = api.model is not None
            model_status["tokenizer_valid"] = api.tokenizer is not None

    except Exception as e:
        logger.error(f"Model validation failed: {str(e)}")
        model_status = {"error": str(e)}
        issues.append(f"Model validation error: {str(e)}")

    # Validate folder structure and permissions
    try:
        folder_status = {"models_folder": api.models_path.exists(), "cache_folder": api.cache_path.exists(),
                         "logs_folder": Path(api.base_path / "logs").exists(), "write_permissions": False}


        # Test write permissions by attempting to create a test file
        test_file = api.models_path / ".test_write"
        try:
            test_file.touch()
            test_file.unlink()
            folder_status["write_permissions"] = True
        except:
            folder_status["write_permissions"] = False
            issues.append("Insufficient write permissions in models directory")

    except Exception as e:
        logger.error(f"Folder validation failed: {str(e)}")
        folder_status = {"error": str(e)}
        issues.append(f"Folder validation error: {str(e)}")

    # Determine overall status
    if not issues:
        overall_status = "valid"
    elif len(issues) < 3:
        overall_status = "warning"
    else:
        overall_status = "invalid"

    validation_response = ValidationResponse(
        config_validation=config_status,
        model_validation=model_status,
        folder_validation=folder_status,
        overall_status=overall_status,
        issues=issues
    )

    logger.info(f"System validation completed with status: {overall_status}")
    return validation_response


@router.get("/system/status",
            response_model=SystemStatusResponse,
            summary="Check System Status",
            description="Returns comprehensive system status including CPU, Memory, GPU, Storage, and Model information")
async def check_system():
    """
    Get system status including:
    - CPU usage
    - Memory usage
    - GPU availability and usage
    - Storage status for model and cache directories
    - Current model status
    """
    logger.info("Checking system status")
    status = SystemStatusResponse()
    system_info = None

    # Check CPU and Memory
    try:
        system_info = get_system_info()
        status.cpu = {
            "usage_percent": system_info["cpu_percent"],
            "status": "healthy" if system_info["cpu_percent"] < 90 else "high"
        }
        logger.debug(f"CPU status retrieved: {status.cpu}")
    except Exception as e:
        logger.error(f"Failed to get CPU info: {str(e)}")
        status.cpu = {"status": "error", "message": str(e)}

    # Check Memory
    try:
        if not system_info:
            system_info = get_system_info()
        status.memory = {
            "usage_percent": system_info["memory_percent"],
            "status": "healthy" if system_info["memory_percent"] < 90 else "critical",
            "available": format_memory_size(psutil.virtual_memory().available)
        }
        logger.debug(f"Memory status retrieved: {status.memory}")
    except Exception as e:
        logger.error(f"Failed to get memory info: {str(e)}")
        status.memory = {"status": "error", "message": str(e)}

    # Check GPU
    try:
        if not system_info:
            system_info = get_system_info()
        status.gpu = {
            "available": system_info["gpu_available"],
            "memory_used": format_memory_size(system_info["gpu_memory_used"]),
            "memory_total": format_memory_size(system_info["gpu_memory_total"]),
            "utilization_percent": system_info["gpu_memory_used"] / system_info["gpu_memory_total"] * 100 if system_info["gpu_available"] else 0
        }
        logger.debug(f"GPU status retrieved: {status.gpu}")
    except Exception as e:
        logger.error(f"Failed to get GPU info: {str(e)}")
        status.gpu = {"status": "error", "message": str(e)}

    # Check Storage
    try:
        models_path = Path(api.models_path)
        cache_path = Path(api.cache_path)
        status.storage = {
            "models_directory": str(models_path),
            "models_size": format_memory_size(sum(f.stat().st_size for f in models_path.glob('**/*') if f.is_file())),
            "cache_directory": str(cache_path),
            "cache_size": format_memory_size(sum(f.stat().st_size for f in cache_path.glob('**/*') if f.is_file()))
        }
        logger.debug(f"Storage status retrieved: {status.storage}")
    except Exception as e:
        logger.error(f"Failed to get storage info: {str(e)}")
        status.storage = {"status": "error", "message": str(e)}

    # Check Model Status
    try:
        current_model_path = api.models_path / api.model_name.split('/')[-1] if api.model_name else None
        status.model = {
            "is_loaded": api.model is not None,
            "current_model": api.model_name,
            "is_valid": validate_model_path(current_model_path) if current_model_path else False,
            "has_chat_template": api.has_chat_template() if api.model else False
        }
        logger.debug(f"Model status retrieved: {status.model}")
    except Exception as e:
        logger.error(f"Failed to get model status: {str(e)}")
        status.model = {"status": "error", "message": str(e)}

    logger.info("System status check completed")
    return status


@router.post("/generate")
async def generate_text(request: GenerateRequest):
    """Generate text response from prompt"""
    logger.info(f"Received generation request for prompt: {request.prompt[:50]}...")
    try:
        response = api.generate_response(
            prompt=request.prompt,
            system_message=request.system_message,
            max_new_tokens=request.max_new_tokens or api.max_new_tokens
        )
        logger.info("Successfully generated response")
        return {"generated_text": response}
    except Exception as e:
        logger.error(f"Error in generate_text endpoint: {str(e)}")
        raise HTTPException(status_code=500, detail=str(e))


@router.post("/generate/stream")
async def generate_stream(request: GenerateRequest):
    """Generate streaming text response from prompt"""
    logger.info(f"Received streaming generation request for prompt: {request.prompt[:50]}...")
    try:
        return api.generate_stream(
            prompt=request.prompt,
            system_message=request.system_message,
            max_new_tokens=request.max_new_tokens or api.max_new_tokens
        )
    except Exception as e:
        logger.error(f"Error in generate_stream endpoint: {str(e)}")
        raise HTTPException(status_code=500, detail=str(e))


@router.post("/embedding", response_model=EmbeddingResponse)
async def generate_embedding(request: EmbeddingRequest):
    """Generate embedding vector from text"""
    logger.info(f"Received embedding request for text: {request.text[:50]}...")
    try:
        embedding = api.generate_embedding(request.text)
        logger.info(f"Successfully generated embedding of dimension {len(embedding)}")
        return EmbeddingResponse(
            embedding=embedding,
            dimension=len(embedding)
        )
    except Exception as e:
        logger.error(f"Error in generate_embedding endpoint: {str(e)}")
        raise HTTPException(status_code=500, detail=str(e))


@router.post("/model/download",
             summary="Download default or specified model",
             description="Downloads model files. Uses default model from config if none specified.")
async def download_model(model_name: Optional[str] = None):
    """Download model files to local storage"""
    try:
        # Use model name from config if none provided
        model_to_download = model_name or config["model"]["defaults"]["model_name"]
        logger.info(f"Received request to download model: {model_to_download}")

        api.download_model(model_to_download)
        logger.info(f"Successfully downloaded model: {model_to_download}")

        return {
            "status": "success",
            "message": f"Model {model_to_download} downloaded",
            "model_name": model_to_download
        }
    except Exception as e:
        logger.error(f"Error downloading model: {str(e)}")
        raise HTTPException(status_code=500, detail=str(e))

@router.post("/model/initialize",
             summary="Initialize default or specified model",
             description="Initialize model for use. Uses default model from config if none specified.")
async def initialize_model(model_name: Optional[str] = None):
    """Initialize a model for use"""
    try:
        # Use model name from config if none provided
        model_to_init = model_name or config["model"]["defaults"]["model_name"]
        logger.info(f"Received request to initialize model: {model_to_init}")

        api.initialize_model(model_to_init)
        logger.info(f"Successfully initialized model: {model_to_init}")

        return {
            "status": "success",
            "message": f"Model {model_to_init} initialized",
            "model_name": model_to_init
        }
    except Exception as e:
        logger.error(f"Error initializing model: {str(e)}")
        raise HTTPException(status_code=500, detail=str(e))


@router.get("/models/status")
async def get_model_status():
    """Get current model status"""
    try:
        status = {
            "model_loaded": api.model is not None,
            "current_model": api.model_name if api.model_name else None,
            "has_chat_template": api.has_chat_template() if api.model else False
        }
        logger.info(f"Retrieved model status: {status}")
        return status
    except Exception as e:
        logger.error(f"Error getting model status: {str(e)}")
        raise HTTPException(status_code=500, detail=str(e))