"""
InnotexBoard - Interface d'administration Debian
Backend FastAPI
"""

from fastapi import FastAPI, Request, HTTPException
from fastapi.middleware.cors import CORSMiddleware
from fastapi.middleware.trustedhost import TrustedHostMiddleware
from slowapi import Limiter, _rate_limit_exceeded_handler
from slowapi.util import get_remote_address
from slowapi.errors import RateLimitExceeded
import uvicorn
import logging
import os
from pathlib import Path
from app.core.config import settings
from app.api.routes import api_router
from app.api.websocket import router as ws_router

# Configuration du répertoire de logs
log_dir = Path(os.getenv('LOG_DIR', '/var/log/innotexboard'))
if not log_dir.exists():
    try:
        log_dir.mkdir(parents=True, exist_ok=True)
    except PermissionError:
        # Fallback sur un répertoire local si pas de permissions
        log_dir = Path('./logs')
        log_dir.mkdir(parents=True, exist_ok=True)

log_file = log_dir / 'security.log'

# Configuration du logging de sécurité
logging.basicConfig(
    level=logging.INFO,
    format='%(asctime)s - %(name)s - %(levelname)s - %(message)s',
    handlers=[
        logging.FileHandler(str(log_file)),
        logging.StreamHandler()
    ]
)
logger = logging.getLogger("innotexboard.security")

# Réduire le bruit des logs watchfiles en développement
logging.getLogger("watchfiles.main").setLevel(logging.WARNING)
logging.getLogger("watchfiles").setLevel(logging.WARNING)

# Rate limiting pour prévenir les attaques brute force et DDoS
limiter = Limiter(key_func=get_remote_address, default_limits=["200/minute"])

# Initialiser l'application FastAPI
app = FastAPI(
    title=settings.API_TITLE,
    description=settings.API_DESCRIPTION,
    version=settings.API_VERSION,
    docs_url="/docs" if settings.DEBUG else None,  # Désactiver docs en production
    redoc_url="/redoc" if settings.DEBUG else None,
    openapi_url="/openapi.json" if settings.DEBUG else None,
)

app.state.limiter = limiter
app.add_exception_handler(RateLimitExceeded, _rate_limit_exceeded_handler)

# Middleware de sécurité CORS - Configuration stricte
app.add_middleware(
    CORSMiddleware,
    allow_origins=settings.ALLOWED_ORIGINS,  # Liste blanche uniquement
    allow_credentials=True,
    allow_methods=["GET", "POST", "PUT", "DELETE", "PATCH"],  # Méthodes explicites
    allow_headers=["Authorization", "Content-Type", "X-Requested-With"],
    expose_headers=["X-RateLimit-Limit", "X-RateLimit-Remaining"],
    max_age=3600,  # Cache preflight 1h
)

# Middleware pour les hôtes de confiance
app.add_middleware(
    TrustedHostMiddleware,
    allowed_hosts=settings.ALLOWED_HOSTS,
)


@app.middleware("http")
async def security_headers_middleware(request: Request, call_next):
    """Ajoute les headers de sécurité HTTP à toutes les réponses"""
    response = await call_next(request)
    
    # Protection contre le clickjacking
    response.headers["X-Frame-Options"] = "DENY"
    
    # Force HTTPS et HSTS (HTTP Strict Transport Security)
    response.headers["Strict-Transport-Security"] = "max-age=31536000; includeSubDomains"
    
    # Prévention du MIME-sniffing
    response.headers["X-Content-Type-Options"] = "nosniff"
    
    # Protection XSS intégrée au navigateur
    response.headers["X-XSS-Protection"] = "1; mode=block"
    
    # Content Security Policy - Politique stricte
    response.headers["Content-Security-Policy"] = (
        "default-src 'self'; "
        "script-src 'self' 'unsafe-inline' 'unsafe-eval'; "
        "style-src 'self' 'unsafe-inline'; "
        "img-src 'self' data: https:; "
        "font-src 'self' data:; "
        "connect-src 'self'; "
        "frame-ancestors 'none'; "
        "base-uri 'self'; "
        "form-action 'self';"
    )
    
    # Contrôle des permissions
    response.headers["Permissions-Policy"] = (
        "geolocation=(), microphone=(), camera=(), payment=()"
    )
    
    # Désactiver la divulgation de la version du serveur
    response.headers["Server"] = "InnotexBoard"
    
    return response


@app.middleware("http")
async def log_security_events(request: Request, call_next):
    """Log les événements de sécurité suspects"""
    client_ip = get_remote_address(request)
    
    # Logger les tentatives d'accès aux endpoints sensibles
    if "/api/v1/auth" in request.url.path:
        logger.info(f"Auth attempt from {client_ip} to {request.url.path}")
    
    response = await call_next(request)
    
    # Logger les erreurs d'authentification
    if response.status_code == 401:
        logger.warning(f"Failed authentication from {client_ip} to {request.url.path}")
    
    # Logger les tentatives d'accès non autorisé
    if response.status_code == 403:
        logger.warning(f"Forbidden access attempt from {client_ip} to {request.url.path}")
    
    return response


# Inclure les routes API
app.include_router(api_router, prefix="/api/v1")
app.include_router(ws_router, prefix="/api/v1")


@app.get("/")
@limiter.limit("10/minute")
async def root(request: Request):
    """Endpoint racine"""
    return {
        "message": "Bienvenue sur InnotexBoard",
        "version": settings.API_VERSION,
        "docs": "/docs" if settings.DEBUG else "Documentation disabled in production",
        "openapi": "/openapi.json" if settings.DEBUG else "OpenAPI disabled in production"
    }


@app.get("/health")
async def health_check():
    """Vérification de la santé de l'application"""
    return {
        "status": "healthy",
        "service": "InnotexBoard API"
    }


if __name__ == "__main__":
    # Configuration pour le développement
    uvicorn.run(
        "main:app",
        host="0.0.0.0",
        port=8000,
        reload=True,
        log_level="info",
    )