import os
os.environ["NUMEXPR_MAX_THREADS"] = "12"

from fastapi import FastAPI, HTTPException, Depends, Body, status, Response
from fastapi.middleware.cors import CORSMiddleware
from contextlib import asynccontextmanager

import logging
from logging.handlers import RotatingFileHandler
from datetime import timedelta
import pathlib

from modules.shared.configuration import APP_CONFIG

def initLogging():
    # Get log level from config (default to INFO if not found)
    logLevelName = APP_CONFIG.get("APP_LOGGING_LOG_LEVEL", "WARNING")
    logLevel = getattr(logging, logLevelName)

    # Create formatters
    consoleFormatter = logging.Formatter(
        fmt=APP_CONFIG.get("APP_LOGGING_FORMAT", "%(asctime)s - %(levelname)s - %(name)s - %(message)s"),
        datefmt=APP_CONFIG.get("APP_LOGGING_DATE_FORMAT", "%Y-%m-%d %H:%M:%S")
    )
    
    # File formatter with more detailed error information
    fileFormatter = logging.Formatter(
        fmt="%(asctime)s - %(levelname)s - %(name)s - %(message)s - %(pathname)s:%(lineno)d\n%(funcName)s\n%(exc_info)s",
        datefmt=APP_CONFIG.get("APP_LOGGING_DATE_FORMAT", "%Y-%m-%d %H:%M:%S")
    )

    # Configure handlers based on config
    handlers = []

    # Add console handler if enabled
    if APP_CONFIG.get("APP_LOGGING_CONSOLE_ENABLED", True):
        consoleHandler = logging.StreamHandler()
        consoleHandler.setFormatter(consoleFormatter)
        handlers.append(consoleHandler)

    # Add file handler if enabled
    if APP_CONFIG.get("APP_LOGGING_FILE_ENABLED", True):
        # Get log file path and ensure it's absolute
        logFile = APP_CONFIG.get("APP_LOGGING_LOG_FILE", "app.log")
        if not os.path.isabs(logFile):
            # If relative path, make it relative to the gateway directory
            gatewayDir = os.path.dirname(os.path.abspath(__file__))
            logFile = os.path.join(gatewayDir, logFile)
        
        # Ensure log directory exists
        logDir = os.path.dirname(logFile)
        if logDir:
            os.makedirs(logDir, exist_ok=True)
            
        rotationSize = int(APP_CONFIG.get("APP_LOGGING_ROTATION_SIZE", 10485760))  # Default: 10MB
        backupCount = int(APP_CONFIG.get("APP_LOGGING_BACKUP_COUNT", 5))
        
        fileHandler = RotatingFileHandler(
            logFile, 
            maxBytes=rotationSize, 
            backupCount=backupCount
        )
        fileHandler.setFormatter(fileFormatter)
        handlers.append(fileHandler)

    # Configure the root logger
    logging.basicConfig(
        level=logLevel,
        format=APP_CONFIG.get("APP_LOGGING_FORMAT", "%(asctime)s - %(levelname)s - %(name)s - %(message)s"),
        datefmt=APP_CONFIG.get("APP_LOGGING_DATE_FORMAT", "%Y-%m-%d %H:%M:%S"),
        handlers=handlers
    )

    
    # Silence noisy third-party libraries - use the same level as the root logger
    noisyLoggers = ["httpx", "urllib3", "asyncio", "fastapi.security.oauth2"]
    for loggerName in noisyLoggers:
        logging.getLogger(loggerName).setLevel(logLevel)


# Initialize logging
initLogging()
logger = logging.getLogger(__name__)
instanceLabel = APP_CONFIG.get("APP_ENV_LABEL")

# Define lifespan context manager for application startup/shutdown events
@asynccontextmanager
async def lifespan(app: FastAPI):
    # Startup logic
    logger.info("Application is starting up")
    
    yield
    
    # Shutdown logic
    logger.info("Application has been shut down")

# START APP
app = FastAPI(
    title="PowerOn | Data Platform API", 
    description=f"Backend API for the Multi-Agent Platform by ValueOn AG ({instanceLabel})",
    lifespan=lifespan
)


# Parse CORS origins from environment variable
def get_allowed_origins():
    origins_str = APP_CONFIG.get("APP_ALLOWED_ORIGINS", "http://localhost:8080")
    # Split by comma and strip whitespace
    origins = [origin.strip() for origin in origins_str.split(",")]
    logger.info(f"CORS allowed origins: {origins}")
    return origins

# CORS configuration using environment variables
app.add_middleware(
    CORSMiddleware,
    allow_origins= get_allowed_origins(),
    allow_credentials=True,
    allow_methods=["GET", "POST", "PUT", "DELETE", "OPTIONS"],
    allow_headers=["*"],
    expose_headers=["*"],
    max_age=86400  # Increased caching for preflight requests
)

# Include all routers
from modules.routes.routeAdmin import router as generalRouter
app.include_router(generalRouter)

from modules.routes.routeAttributes import router as attributesRouter
app.include_router(attributesRouter)

from modules.routes.routeDataMandates import router as mandateRouter
app.include_router(mandateRouter)

from modules.routes.routeDataUsers import router as userRouter
app.include_router(userRouter)

from modules.routes.routeDataFiles import router as fileRouter
app.include_router(fileRouter)

from modules.routes.routeDataPrompts import router as promptRouter
app.include_router(promptRouter)

from modules.routes.routeWorkflows import router as workflowRouter
app.include_router(workflowRouter)

from modules.routes.routeSecurityMsft import router as msftRouter
app.include_router(msftRouter)

from modules.routes.routeSecurityGoogle import router as googleRouter
app.include_router(googleRouter)