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)

    # Configure handlers based on config
    handlers = []

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

    # Add file handler if enabled
    if APP_CONFIG.get("APP_LOGGING_FILE_ENABLED", True):
        logFile = APP_CONFIG.get("APP_LOGGING_LOG_FILE", "app.log")
        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
        )
        handlers.append(fileHandler)

    # Configure the 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.routeGeneral import router as generalRouter
app.include_router(generalRouter)

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

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

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

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

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

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

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

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