"""Django settings for IoT PreTester 4.6 Demo."""

import os
from pathlib import Path

from django.core.exceptions import ImproperlyConfigured

BASE_DIR = Path(__file__).resolve().parent.parent


def env_bool(name: str, default: bool = False) -> bool:
    return os.environ.get(name, str(default)).strip().lower() in {"1", "true", "yes"}


DEBUG = env_bool("DEBUG", False)
SECRET_KEY = os.environ.get("SECRET_KEY")
if not SECRET_KEY:
    if DEBUG:
        SECRET_KEY = "django-insecure-iot-pretester-4.6-demo-local-only"
    else:
        raise ImproperlyConfigured("SECRET_KEY must be configured when DEBUG is disabled.")

ALLOWED_HOSTS = [
    host.strip()
    for host in os.environ.get("ALLOWED_HOSTS", "localhost,127.0.0.1").split(",")
    if host.strip()
]

INSTALLED_APPS = [
    "django.contrib.admin",
    "django.contrib.auth",
    "django.contrib.contenttypes",
    "django.contrib.sessions",
    "django.contrib.messages",
    "django.contrib.staticfiles",
    "corsheaders",
    "rest_framework",
    "IoTAnalyzer",
]

MIDDLEWARE = [
    "django.middleware.security.SecurityMiddleware",
    "django.contrib.sessions.middleware.SessionMiddleware",
    "corsheaders.middleware.CorsMiddleware",
    "django.middleware.common.CommonMiddleware",
    "django.middleware.csrf.CsrfViewMiddleware",
    "django.contrib.auth.middleware.AuthenticationMiddleware",
    "django.contrib.messages.middleware.MessageMiddleware",
    "django.middleware.clickjacking.XFrameOptionsMiddleware",
    "IoTAnalyzer.middleware.RequestLogMiddleware",
]

ROOT_URLCONF = "IoTPreTester.urls"
WSGI_APPLICATION = "IoTPreTester.wsgi.application"

TEMPLATES = [
    {
        "BACKEND": "django.template.backends.django.DjangoTemplates",
        "DIRS": [],
        "APP_DIRS": True,
        "OPTIONS": {
            "context_processors": [
                "django.template.context_processors.request",
                "django.contrib.auth.context_processors.auth",
                "django.contrib.messages.context_processors.messages",
            ]
        },
    }
]

DATABASES = {
    "default": {
        "ENGINE": "django.db.backends.sqlite3",
        "NAME": os.environ.get("DATABASE_PATH", BASE_DIR / "db.sqlite3"),
        "OPTIONS": {"timeout": 30},
    }
}

AUTH_PASSWORD_VALIDATORS = [
    {"NAME": "django.contrib.auth.password_validation.UserAttributeSimilarityValidator"},
    {"NAME": "django.contrib.auth.password_validation.MinimumLengthValidator"},
    {"NAME": "django.contrib.auth.password_validation.CommonPasswordValidator"},
    {"NAME": "django.contrib.auth.password_validation.NumericPasswordValidator"},
]

PASSWORD_HASHERS = [
    "django.contrib.auth.hashers.BCryptSHA256PasswordHasher",
    "django.contrib.auth.hashers.PBKDF2PasswordHasher",
]

REST_FRAMEWORK = {
    "DEFAULT_AUTHENTICATION_CLASSES": [
        "IoTAnalyzer.authentication.DemoSessionAuthentication",
    ],
    "DEFAULT_PERMISSION_CLASSES": [
        "rest_framework.permissions.IsAuthenticated",
    ],
    "DEFAULT_THROTTLE_CLASSES": [
        "rest_framework.throttling.UserRateThrottle",
    ],
    "DEFAULT_THROTTLE_RATES": {"user": "20/second"},
}

CORS_ALLOW_ALL_ORIGINS = env_bool("CORS_ALLOW_ALL_ORIGINS", False)
CORS_ALLOWED_ORIGINS = [
    origin.strip()
    for origin in os.environ.get("CORS_ALLOWED_ORIGINS", "http://localhost:3000").split(",")
    if origin.strip()
]
CORS_ALLOW_CREDENTIALS = True

LANGUAGE_CODE = "en-us"
TIME_ZONE = "UTC"
USE_I18N = True
USE_TZ = True

STATIC_URL = "static/"
STATIC_ROOT = BASE_DIR / "staticfiles"
CAPTURE_UPLOAD_DIR = Path(
    os.environ.get("CAPTURE_UPLOAD_DIR", BASE_DIR.parent / "uploads")
)


def env_int(name: str, default: int) -> int:
    try:
        return int(os.environ.get(name, default))
    except (TypeError, ValueError):
        return default


# Bounds for a single capture analysis pass. 0 disables the packet limit and
# reads the capture completely; large captures then take correspondingly longer.
CAPTURE_PACKET_LIMIT = env_int("CAPTURE_PACKET_LIMIT", 0)
CAPTURE_MAX_TEXT_PAYLOADS = env_int("CAPTURE_MAX_TEXT_PAYLOADS", 20000)
CAPTURE_MAX_PAYLOAD_CHARS = env_int("CAPTURE_MAX_PAYLOAD_CHARS", 16384)

# --- Logging -----------------------------------------------------------------
# Console output goes to the container log; backend.log keeps a rotating copy.
# Every capture analysis additionally writes <capture>.analysis.log next to
# the upload, which the API exposes for troubleshooting.
LOG_DIR = Path(os.environ.get("LOG_DIR", BASE_DIR.parent / "logs"))
LOG_LEVEL = os.environ.get("LOG_LEVEL", "info").upper()
try:
    LOG_DIR.mkdir(parents=True, exist_ok=True)
    _FILE_LOGGING = True
except OSError:
    _FILE_LOGGING = False

LOGGING = {
    "version": 1,
    "disable_existing_loggers": False,
    "formatters": {
        "standard": {
            "format": "%(asctime)s %(levelname)-7s [%(name)s] %(message)s",
            "datefmt": "%Y-%m-%d %H:%M:%S",
        },
    },
    "handlers": {
        "console": {
            "class": "logging.StreamHandler",
            "formatter": "standard",
            "stream": "ext://sys.stdout",
        },
        **({
            "file": {
                "class": "logging.handlers.RotatingFileHandler",
                "formatter": "standard",
                "filename": str(LOG_DIR / "backend.log"),
                "maxBytes": 10 * 1024 * 1024,
                "backupCount": 5,
                "encoding": "utf-8",
            },
        } if _FILE_LOGGING else {}),
    },
    "root": {
        "handlers": ["console"] + (["file"] if _FILE_LOGGING else []),
        "level": LOG_LEVEL,
    },
    "loggers": {
        "django": {"level": "INFO", "propagate": True},
        "django.request": {"level": "WARNING", "propagate": True},
        "django.server": {"level": "INFO", "propagate": True},
        "IoTAnalyzer": {"level": LOG_LEVEL, "propagate": True},
        "analyzer": {"level": LOG_LEVEL, "propagate": True},
    },
}
DEFAULT_AUTO_FIELD = "django.db.models.BigAutoField"
APPEND_SLASH = False

SESSION_COOKIE_HTTPONLY = True
SESSION_COOKIE_SAMESITE = "Lax"
X_FRAME_OPTIONS = "DENY"
SECURE_CONTENT_TYPE_NOSNIFF = True

if not DEBUG:
    SESSION_COOKIE_SECURE = env_bool("SESSION_COOKIE_SECURE", False)
    CSRF_COOKIE_SECURE = env_bool("CSRF_COOKIE_SECURE", False)