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

from fastapi import FastAPI, HTTPException, Depends, Body, status, Response
from fastapi.middleware.cors import CORSMiddleware
from fastapi.responses import JSONResponse, FileResponse
from fastapi.staticfiles import StaticFiles
from fastapi.security import OAuth2PasswordRequestForm

import uvicorn
from typing import Dict, Any
import logging
from logging.handlers import RotatingFileHandler
from datetime import timedelta
import pathlib

from modules.utility import APP_CONFIG
from modules.gateway_interface import get_gateway_interface



# Import auth module
from modules.auth import (
    create_access_token,
    get_current_active_user, 
    get_user_context,
    ACCESS_TOKEN_EXPIRE_MINUTES
)

# Import models - generisch importieren zur INITIALISIERUNG, auch wenn dummy!
import modules.gateway_model as gateway_model
import modules.lucydom_interface as lucydom_model



def init_logging():
    # Get log level from config (default to INFO if not found)
    log_level_name = APP_CONFIG.get("APP_LOG_LEVEL", "INFO")
    log_level = getattr(logging, log_level_name)

    # Configure handlers based on config
    handlers = []

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

    # Add file handler if enabled
    if APP_CONFIG.get("Logging_FILE_ENABLED", True):
        log_file = APP_CONFIG.get("APP_LOG_FILE", "app.log")
        rotation_size = int(APP_CONFIG.get("Logging_ROTATION_SIZE", 10485760))  # Default: 10MB
        backup_count = int(APP_CONFIG.get("Logging_BACKUP_COUNT", 5))
        
        file_handler = RotatingFileHandler(
            log_file, 
            maxBytes=rotation_size, 
            backupCount=backup_count
        )
        handlers.append(file_handler)

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


# START APP

init_logging()
logger = logging.getLogger(__name__)
app = FastAPI(title="PowerOn | Data Platform API", description="Backend-API für die Multi-Agent Platform von ValueOn AG")

# CORS-Konfiguration für Frontend-Anfragen
app.add_middleware(
    CORSMiddleware,
    allow_origins=["http://localhost:8080","https://poweron-lucyagents-xxx.germanywestcentral-01.azurewebsites.net"],
    allow_credentials=True,
    allow_methods=["GET", "POST", "PUT", "DELETE", "OPTIONS"],
    allow_headers=["*"],
    expose_headers=["*"],
    max_age=86400  # Erhöhung des Caching für Preflight-Anfragen
)

# Statischer Folder für Frontend - mit absolutem Pfad arbeiten
base_dir = pathlib.Path(__file__).parent
static_folder = base_dir / "static"
os.makedirs(static_folder, exist_ok=True)
app.mount("/static", StaticFiles(directory=str(static_folder)), name="static")

# Add a specific route for favicon.ico
@app.get("/favicon.ico", include_in_schema=False)
async def favicon():
    favicon_path = static_folder / "favicon.ico"
    return FileResponse(str(favicon_path))

# Generelle Elements
@app.get("/", tags=["General"])
async def root():
    """API-Statusendpunkt"""
    return {"status": "online", "message": "Data Platform API ist aktiv"}

@app.get("/api/test", tags=["General"])
async def get_test():
    return "OK 1.5"

@app.options("/{full_path:path}",  tags=["General"])
async def options_route(full_path: str):
    return Response(status_code=200)


# Token-Endpunkt für Login
@app.post("/api/token", response_model=gateway_model.Token, tags=["General"])
async def login_for_access_token(form_data: OAuth2PasswordRequestForm = Depends()):
    # Gateway-Interface ohne Kontext initialisieren
    gateway = get_gateway_interface()
    
    # Benutzer authentifizieren
    user = gateway.authenticate_user(form_data.username, form_data.password)
    
    if not user:
        raise HTTPException(
            status_code=status.HTTP_401_UNAUTHORIZED,
            detail="Ungültiger Benutzername oder Passwort",
            headers={"WWW-Authenticate": "Bearer"},
        )
    
    # Token mit Mandanten-ID erstellen
    access_token_expires = timedelta(minutes=ACCESS_TOKEN_EXPIRE_MINUTES)
    access_token = create_access_token(
        data={
            "sub": user["username"],
            "mandate_id": user["mandate_id"]
        },
        expires_delta=access_token_expires
    )
    
    return {"access_token": access_token, "token_type": "bearer"}

# Benutzerinfo abrufen
@app.get("/api/user/me", response_model=Dict[str, Any], tags=["General"])
async def read_user_me(current_user: Dict[str, Any] = Depends(get_current_active_user)):
    return current_user

# Alle Router einbinden
from routes.attributes import router as attributes_router
app.include_router(attributes_router)

from routes.mandates import router as mandate_router
app.include_router(mandate_router)

from routes.users import router as user_router
app.include_router(user_router)

from routes.files import router as file_router
app.include_router(file_router)

from routes.prompts import router as prompt_router
app.include_router(prompt_router)

from routes.workflows import router as workflow_router
app.include_router(workflow_router)


# Event handler beim Herunterfahren
@app.on_event("shutdown")
async def shutdown_event():
    """Führt Aufräumarbeiten beim Herunterfahren der Anwendung durch"""
    logger.info("Anwendung wurde heruntergefahren")

#if __name__ == "__main__":
#    uvicorn.run("app:app", host="0.0.0.0", port=8000, reload=True)