"""Django settings for the SAR Link portal API."""

from pathlib import Path

import environ

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

env = environ.Env(
    DJANGO_DEBUG=(bool, True),
    ALLOWED_HOSTS=(list, ["localhost", "127.0.0.1", "backend"]),
    CORS_ALLOWED_ORIGINS=(list, ["http://localhost:5173"]),
    CSRF_TRUSTED_ORIGINS=(list, []),
    SECURE_SSL_REDIRECT=(bool, False),
    SECURE_HSTS_SECONDS=(int, 0),
    SECRET_KEY=(str, "insecure-dev-key-change-me"),
    POSTGRES_DATABASE=(str, "sarlink"),
    POSTGRES_USER=(str, "sarlink"),
    POSTGRES_PASSWORD=(str, "changeme"),
    POSTGRES_HOST=(str, "database"),
    POSTGRES_PORT=(int, 5432),
    SMS_API_URL=(str, "https://smsapi.sarlink.net/api/sms/send"),
    SMS_API_KEY=(str, ""),
    OTP_TTL_SECONDS=(int, 300),
    OTP_MAX_ATTEMPTS=(int, 5),
    OTP_RESEND_COOLDOWN_SECONDS=(int, 60),
    REGISTRATION_TICKET_TTL_SECONDS=(int, 1800),
    FRONTEND_URL=(str, "http://localhost:5173"),
)
environ.Env.read_env(BASE_DIR / ".env")

SECRET_KEY = env("SECRET_KEY")
DEBUG = env("DJANGO_DEBUG")
ALLOWED_HOSTS = env("ALLOWED_HOSTS")

INSTALLED_APPS = [
    "django.contrib.admin",
    "django.contrib.auth",
    "django.contrib.contenttypes",
    "django.contrib.sessions",
    "django.contrib.messages",
    "whitenoise.runserver_nostatic",
    "django.contrib.staticfiles",
    # third party
    "rest_framework",
    "knox",
    "django_filters",
    "corsheaders",
    "procrastinate.contrib.django",
    # applications
    "core",
    "locations",
    "users",
]

MIDDLEWARE = [
    "django.middleware.security.SecurityMiddleware",
    "whitenoise.middleware.WhiteNoiseMiddleware",
    "corsheaders.middleware.CorsMiddleware",
    "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",
]

ROOT_URLCONF = "apibase.urls"

TEMPLATES = [
    {
        "BACKEND": "django.template.backends.django.DjangoTemplates",
        "DIRS": [BASE_DIR / "templates"],
        "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 = "apibase.wsgi.application"
ASGI_APPLICATION = "apibase.asgi.application"

# -----------------------------------------------------------------------------
# Database
# -----------------------------------------------------------------------------
DATABASES = {
    "default": {
        "ENGINE": "django.db.backends.postgresql",
        "NAME": env("POSTGRES_DATABASE"),
        "USER": env("POSTGRES_USER"),
        "PASSWORD": env("POSTGRES_PASSWORD"),
        "HOST": env("POSTGRES_HOST"),
        "PORT": env("POSTGRES_PORT"),
    }
}
DEFAULT_AUTO_FIELD = "django.db.models.BigAutoField"

# -----------------------------------------------------------------------------
# Auth
# -----------------------------------------------------------------------------
AUTH_USER_MODEL = "users.User"

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"},
]

# Knox: the token itself is only ever returned once, at login.
REST_KNOX = {
    "TOKEN_TTL": None,  # tokens live until logout
    "TOKEN_LIMIT_PER_USER": None,
    "AUTO_REFRESH": False,
}

# -----------------------------------------------------------------------------
# DRF
# -----------------------------------------------------------------------------
REST_FRAMEWORK = {
    "DEFAULT_AUTHENTICATION_CLASSES": ["knox.auth.TokenAuthentication"],
    "DEFAULT_PERMISSION_CLASSES": ["rest_framework.permissions.IsAuthenticated"],
    "DEFAULT_FILTER_BACKENDS": ["django_filters.rest_framework.DjangoFilterBackend"],
    "DEFAULT_PAGINATION_CLASS": "core.pagination.DefaultPagination",
    "PAGE_SIZE": 25,
    "DEFAULT_THROTTLE_CLASSES": ["rest_framework.throttling.ScopedRateThrottle"],
    "DEFAULT_THROTTLE_RATES": {
        # Unauthenticated auth endpoints, keyed per IP.
        "auth_start": "30/hour",
        "auth_login": "20/hour",
        "otp_request": "10/hour",
        "register": "10/hour",
    },
    "EXCEPTION_HANDLER": "core.exceptions.exception_handler",
}

if DEBUG:
    INSTALLED_APPS.append("drf_spectacular")
    REST_FRAMEWORK["DEFAULT_SCHEMA_CLASS"] = "drf_spectacular.openapi.AutoSchema"

SPECTACULAR_SETTINGS = {
    "TITLE": "SAR Link Portal API",
    "VERSION": "2.0.0",
    "SERVE_INCLUDE_SCHEMA": False,
}

# -----------------------------------------------------------------------------
# CORS / CSRF - the SPA is served from a different origin in dev
# -----------------------------------------------------------------------------
CORS_ALLOWED_ORIGINS = env("CORS_ALLOWED_ORIGINS")
CORS_ALLOW_CREDENTIALS = False
CSRF_TRUSTED_ORIGINS = env("CSRF_TRUSTED_ORIGINS")

# -----------------------------------------------------------------------------
# i18n / tz
# -----------------------------------------------------------------------------
LANGUAGE_CODE = "en-us"
TIME_ZONE = "Indian/Maldives"
USE_I18N = True
USE_TZ = True

# -----------------------------------------------------------------------------
# Static / media
# -----------------------------------------------------------------------------
STATIC_URL = "static/"
STATIC_ROOT = BASE_DIR / "staticfiles"
MEDIA_URL = "media/"
MEDIA_ROOT = BASE_DIR / "media"
STORAGES = {
    "default": {"BACKEND": "django.core.files.storage.FileSystemStorage"},
    "staticfiles": {
        "BACKEND": "whitenoise.storage.CompressedManifestStaticFilesStorage"
    },
}

# -----------------------------------------------------------------------------
# Background tasks (procrastinate)
# -----------------------------------------------------------------------------
PROCRASTINATE_APP = "apibase.tasks.app"

# -----------------------------------------------------------------------------
# SMS / OTP
# -----------------------------------------------------------------------------
SMS_API_URL = env("SMS_API_URL")
SMS_API_KEY = env("SMS_API_KEY")
OTP_TTL_SECONDS = env("OTP_TTL_SECONDS")
OTP_MAX_ATTEMPTS = env("OTP_MAX_ATTEMPTS")
OTP_RESEND_COOLDOWN_SECONDS = env("OTP_RESEND_COOLDOWN_SECONDS")
# How long a verified number stays redeemable for the registration form.
REGISTRATION_TICKET_TTL_SECONDS = env("REGISTRATION_TICKET_TTL_SECONDS")
FRONTEND_URL = env("FRONTEND_URL")

# -----------------------------------------------------------------------------
# Production hardening
# -----------------------------------------------------------------------------
if not DEBUG:
    SECURE_SSL_REDIRECT = env("SECURE_SSL_REDIRECT")
    SECURE_HSTS_SECONDS = env("SECURE_HSTS_SECONDS")
    SECURE_PROXY_SSL_HEADER = ("HTTP_X_FORWARDED_PROTO", "https")
    SESSION_COOKIE_SECURE = True
    CSRF_COOKIE_SECURE = True

LOGGING = {
    "version": 1,
    "disable_existing_loggers": False,
    "formatters": {
        "simple": {"format": "{levelname} {asctime} {name} {message}", "style": "{"},
    },
    "handlers": {
        "console": {"class": "logging.StreamHandler", "formatter": "simple"},
    },
    "root": {"handlers": ["console"], "level": "INFO"},
}