"""
Basis-Settings. Werden von dev.py und production.py erweitert.
"""
from pathlib import Path

import environ

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

env = environ.Env(
    DJANGO_DEBUG=(bool, False),
    USE_X_FORWARDED_HOST=(bool, True),
    JOB_RETENTION_DAYS=(int, 30),
)

# --- Core --------------------------------------------------------------------
SECRET_KEY = env("DJANGO_SECRET_KEY", default="dev-insecure-change-me")
DEBUG = env("DJANGO_DEBUG")
ALLOWED_HOSTS = env.list("DJANGO_ALLOWED_HOSTS", default=["*"])
CSRF_TRUSTED_ORIGINS = env.list("CSRF_TRUSTED_ORIGINS", default=[])

# Hinter dem äußeren Reverse-Proxy
USE_X_FORWARDED_HOST = env("USE_X_FORWARDED_HOST")
_proxy_header = env("SECURE_PROXY_SSL_HEADER", default="")
if _proxy_header:
    name, value = _proxy_header.split(",", 1)
    SECURE_PROXY_SSL_HEADER = (name.strip(), value.strip())

# --- Apps --------------------------------------------------------------------
INSTALLED_APPS = [
    "django.contrib.admin",
    "django.contrib.auth",
    "django.contrib.contenttypes",
    "django.contrib.sessions",
    "django.contrib.messages",
    "django.contrib.staticfiles",
    # 3rd party
    "django_celery_beat",
    "django_celery_results",
    "django_htmx",
    "axes",
    # local
    "mailmerge",
]

MIDDLEWARE = [
    "django.middleware.security.SecurityMiddleware",
    "django.contrib.sessions.middleware.SessionMiddleware",
    "django.middleware.common.CommonMiddleware",
    "django.middleware.csrf.CsrfViewMiddleware",
    "django.contrib.auth.middleware.AuthenticationMiddleware",
    "django.contrib.messages.middleware.MessageMiddleware",
    "django.middleware.clickjacking.XFrameOptionsMiddleware",
    "django_htmx.middleware.HtmxMiddleware",
    "axes.middleware.AxesMiddleware",
]

ROOT_URLCONF = "config.urls"

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

WSGI_APPLICATION = "config.wsgi.application"

# --- Database ----------------------------------------------------------------
DATABASES = {
    "default": env.db_url(
        "DATABASE_URL", default="sqlite:///" + str(BASE_DIR / "db.sqlite3")
    ),
}

# --- Auth --------------------------------------------------------------------
AUTH_PASSWORD_VALIDATORS = [
    {"NAME": "django.contrib.auth.password_validation.UserAttributeSimilarityValidator"},
    {"NAME": "django.contrib.auth.password_validation.MinimumLengthValidator",
     "OPTIONS": {"min_length": 12}},
    {"NAME": "django.contrib.auth.password_validation.CommonPasswordValidator"},
    {"NAME": "django.contrib.auth.password_validation.NumericPasswordValidator"},
]
PASSWORD_HASHERS = [
    "django.contrib.auth.hashers.Argon2PasswordHasher",
    "django.contrib.auth.hashers.PBKDF2PasswordHasher",
]

AUTHENTICATION_BACKENDS = [
    "axes.backends.AxesStandaloneBackend",
    "django.contrib.auth.backends.ModelBackend",
]

LOGIN_URL = "/accounts/login/"
LOGIN_REDIRECT_URL = "/"
LOGOUT_REDIRECT_URL = "/accounts/login/"

# django-axes – Brute-Force-Schutz
AXES_FAILURE_LIMIT = 5
AXES_COOLOFF_TIME = 1  # Stunde
AXES_LOCKOUT_PARAMETERS = ["username", "ip_address"]

# --- I18N / TZ ---------------------------------------------------------------
LANGUAGE_CODE = "de-at"
TIME_ZONE = "Europe/Vienna"
USE_I18N = True
USE_TZ = True

# --- Static / Media ----------------------------------------------------------
STATIC_URL = "/static/"
STATIC_ROOT = BASE_DIR / "staticfiles"
MEDIA_URL = "/media/"
MEDIA_ROOT = BASE_DIR / "media"

# --- Celery ------------------------------------------------------------------
CELERY_BROKER_URL = env("CELERY_BROKER_URL", default="redis://redis:6379/0")
CELERY_RESULT_BACKEND = env("CELERY_RESULT_BACKEND", default="django-db")
CELERY_TASK_TRACK_STARTED = True
CELERY_TASK_TIME_LIMIT = 600  # 10 Minuten Hard-Timeout
CELERY_TASK_SOFT_TIME_LIMIT = 540
CELERY_WORKER_PREFETCH_MULTIPLIER = 1
CELERY_TIMEZONE = TIME_ZONE

# --- App ---------------------------------------------------------------------
JOB_RETENTION_DAYS = env("JOB_RETENTION_DAYS")
DEFAULT_AUTO_FIELD = "django.db.models.BigAutoField"

# --- Security Defaults -------------------------------------------------------
SESSION_COOKIE_HTTPONLY = True
SESSION_COOKIE_SAMESITE = "Lax"
CSRF_COOKIE_HTTPONLY = False  # Bleibt false, damit JS/HTMX-Forms funktionieren
CSRF_COOKIE_SAMESITE = "Lax"
X_FRAME_OPTIONS = "DENY"
SECURE_CONTENT_TYPE_NOSNIFF = True
SECURE_REFERRER_POLICY = "strict-origin-when-cross-origin"