"""
Base Django settings shared across all environments.

Environment-specific overrides live in `dev.py` and `prod.py`. Select one with
the DJANGO_SETTINGS_MODULE environment variable.
"""

import os
from datetime import timedelta
from pathlib import Path

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


def get_env_list(var_name: str, default_list: list[str]) -> list[str]:
    val = os.environ.get(var_name)
    if val:
        return [item.strip() for item in val.split(",")]
    return default_list


DOMAIN = os.environ.get("DOMAIN", "localhost")

ALLOWED_HOSTS = get_env_list(
    "ALLOWED_HOSTS",
    ["localhost", "127.0.0.1", "backend", "worker", DOMAIN],
)

INSTALLED_APPS = [
    "whitenoise.runserver_nostatic",
    "django.contrib.admin",
    "django.contrib.auth",
    "django.contrib.contenttypes",
    "django.contrib.sessions",
    "django.contrib.messages",
    "django.contrib.staticfiles",
    # Third party
    "rest_framework",
    "rest_framework.authtoken",
    "rest_framework_simplejwt",
    "rest_framework_simplejwt.token_blacklist",
    "corsheaders",
    "django_filters",
    "drf_spectacular",
    "django_ratelimit",
    "django_celery_beat",
    # Local
    "api",
]

MIDDLEWARE = [
    "django.middleware.security.SecurityMiddleware",
    "whitenoise.middleware.WhiteNoiseMiddleware",
    "compression_middleware.middleware.CompressionMiddleware",
    "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",
]

ROOT_URLCONF = "holy_backend.urls"

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",
            ],
        },
    },
]

WSGI_APPLICATION = "holy_backend.wsgi.application"

DATABASES = {
    "default": {
        "ENGINE": "django.db.backends.sqlite3",
        "NAME": BASE_DIR / "db.sqlite3",
    }
}

DJANGO_CACHE_URL = os.environ.get("DJANGO_CACHE_URL", "redis://redis:6379/1")

CACHES = {
    "default": {
        "BACKEND": "django.core.cache.backends.redis.RedisCache",
        "LOCATION": DJANGO_CACHE_URL,
    }
}

SILENCED_SYSTEM_CHECKS = ["django_ratelimit.W001", "django_ratelimit.E003"]

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"},
]

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

STATIC_URL = "static/"
STATIC_ROOT = BASE_DIR / "staticfiles"
STATICFILES_STORAGE = "whitenoise.storage.CompressedStaticFilesStorage"
WHITENOISE_INDEX_PAGE = True

MEDIA_URL = "media/"
MEDIA_ROOT = BASE_DIR / "media"

# Reverse proxy
USE_X_FORWARDED_HOST = True
USE_X_FORWARDED_PORT = True
SECURE_PROXY_SSL_HEADER = ("HTTP_X_FORWARDED_PROTO", "https")

CSRF_TRUSTED_ORIGINS = get_env_list(
    "CSRF_TRUSTED_ORIGINS",
    [f"https://{DOMAIN}", "http://localhost:5173"],
)

AUTH_USER_MODEL = "api.User"

REST_FRAMEWORK = {
    "DEFAULT_AUTHENTICATION_CLASSES": [
        "api.utils.cookie_auth.CookieJWTAuthentication",
    ],
    "DEFAULT_PERMISSION_CLASSES": [
        "rest_framework.permissions.IsAuthenticatedOrReadOnly",
    ],
    "DEFAULT_FILTER_BACKENDS": ["django_filters.rest_framework.DjangoFilterBackend"],
    "DEFAULT_PAGINATION_CLASS": "rest_framework.pagination.PageNumberPagination",
    "PAGE_SIZE": 50,
    "DEFAULT_SCHEMA_CLASS": "drf_spectacular.openapi.AutoSchema",
}

SIMPLE_JWT = {
    "ACCESS_TOKEN_LIFETIME": timedelta(minutes=60),
    "REFRESH_TOKEN_LIFETIME": timedelta(days=14),
    "ROTATE_REFRESH_TOKENS": True,
    "BLACKLIST_AFTER_ROTATION": True,
    "AUTH_HEADER_TYPES": ("Bearer",),
}

# httpOnly-cookie JWT config. The Authorization header path is kept as a
# fallback during the rollout — once all clients use cookies it can be removed.
JWT_AUTH_COOKIE_ACCESS = "access_token"
JWT_AUTH_COOKIE_REFRESH = "refresh_token"
JWT_AUTH_COOKIE_SECURE = False  # prod.py overrides to True
JWT_AUTH_COOKIE_SAMESITE = "Lax"
JWT_AUTH_COOKIE_PATH = "/"

CORS_ALLOWED_ORIGINS = get_env_list(
    "CORS_ALLOWED_ORIGINS",
    [f"https://{DOMAIN}", "http://localhost:5173", "http://127.0.0.1:5173"],
)
CORS_ALLOW_CREDENTIALS = True

FRONTEND_URL = os.environ.get("FRONTEND_URL", f"https://{DOMAIN}").rstrip("/")

# Email (SMTP)
EMAIL_HOST = os.environ.get("EMAIL_HOST")
EMAIL_PORT = int(os.environ.get("EMAIL_PORT", 587))
EMAIL_USE_TLS = os.environ.get("EMAIL_USE_TLS", "false").lower() == "true"
EMAIL_USE_SSL = os.environ.get("EMAIL_USE_SSL", "false").lower() == "true"
EMAIL_HOST_USER = os.environ.get("EMAIL_HOST_USER")
EMAIL_HOST_PASSWORD = os.environ.get("EMAIL_HOST_PASSWORD")
EMAIL_SKIP_CERT_VERIFICATION = (
    os.environ.get("EMAIL_SKIP_CERT_VERIFICATION", "false").lower() == "true"
)
DEFAULT_FROM_EMAIL = os.environ.get("DEFAULT_FROM_EMAIL", EMAIL_HOST_USER)
SERVER_EMAIL = DEFAULT_FROM_EMAIL

if EMAIL_HOST:
    EMAIL_BACKEND = "api.email_backend.InsecureEmailBackend"
else:
    EMAIL_BACKEND = "django.core.mail.backends.console.EmailBackend"

SPECTACULAR_SETTINGS = {
    "TITLE": "Holy Flavors API",
    "DESCRIPTION": "API for rating flavors",
    "VERSION": "1.0.0",
    "SERVE_INCLUDE_SCHEMA": False,
}

# Celery
CELERY_BROKER_URL = os.environ.get("CELERY_BROKER_URL", "redis://redis:6379/0")
CELERY_RESULT_BACKEND = os.environ.get("CELERY_RESULT_BACKEND", "redis://redis:6379/0")
CELERY_TIMEZONE = TIME_ZONE
CELERY_TASK_TRACK_STARTED = True
CELERY_TASK_TIME_LIMIT = 30 * 60
CELERY_BEAT_SCHEDULER = "django_celery_beat.schedulers:DatabaseScheduler"
CELERY_TASK_ALWAYS_EAGER = os.environ.get("CELERY_TASK_ALWAYS_EAGER", "false").lower() == "true"
CELERY_TASK_ACKS_LATE = True
CELERY_TASK_REJECT_ON_WORKER_LOST = True
CELERY_WORKER_PREFETCH_MULTIPLIER = 1
CELERY_RESULT_EXPIRES = 3600