import os
from pathlib import Path

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

# Holds the SQLite database. A Fly volume in production, a Docker volume in compose.
DATA_DIR = Path(os.environ.get("INTENT_DATA_DIR", BASE_DIR / "data"))

SECRET_KEY = os.environ.get("DJANGO_SECRET_KEY", "")
DEBUG = False
ALLOWED_HOSTS = []

INSTALLED_APPS = [
    "django.contrib.admin",
    "django.contrib.auth",
    "django.contrib.contenttypes",
    "django.contrib.sessions",
    "django.contrib.messages",
    "django.contrib.staticfiles",
    "allauth",
    "allauth.account",
    "allauth.socialaccount",
    "allauth.socialaccount.providers.discord",
    "allauth.socialaccount.providers.github",
    # Forgejo instances are OpenID Connect apps, one SocialApp per instance, added in admin.
    "allauth.socialaccount.providers.openid_connect",
    "intent.core",
    "intent.accounts",
    "intent.orgs",
]

MIDDLEWARE = [
    # First, so health checks skip host validation and the HTTPS redirect.
    "intent.core.middleware.HealthCheckMiddleware",
    "django.middleware.security.SecurityMiddleware",
    "django.contrib.sessions.middleware.SessionMiddleware",
    "django.middleware.common.CommonMiddleware",
    "django.middleware.csrf.CsrfViewMiddleware",
    "django.contrib.auth.middleware.AuthenticationMiddleware",
    "allauth.account.middleware.AccountMiddleware",
    "django.contrib.messages.middleware.MessageMiddleware",
    "django.middleware.clickjacking.XFrameOptionsMiddleware",
]

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

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",
            ],
        },
    },
]

DATABASES = {
    "default": {
        "ENGINE": "django.db.backends.sqlite3",
        "NAME": DATA_DIR / "db.sqlite3",
        "OPTIONS": {
            # Take the write lock at BEGIN so concurrent writers wait instead of failing.
            "transaction_mode": "IMMEDIATE",
            "timeout": 5,
            # WAL is required by Litestream.
            "init_command": "PRAGMA journal_mode=WAL; PRAGMA synchronous=NORMAL;",
        },
    }
}

AUTH_USER_MODEL = "accounts.User"
DEFAULT_AUTO_FIELD = "django.db.models.BigAutoField"

AUTHENTICATION_BACKENDS = [
    # Password login, used only by sysadmins at /admin/.
    "django.contrib.auth.backends.ModelBackend",
    "allauth.account.auth_backends.AuthenticationBackend",
]

LOGIN_URL = "account_login"
LOGIN_REDIRECT_URL = "home"

# Regular users never have a password: they sign in with an emailed code or a linked provider.
ACCOUNT_ADAPTER = "intent.accounts.adapter.AccountAdapter"
ACCOUNT_LOGIN_METHODS = {"email"}
ACCOUNT_SIGNUP_FIELDS = ["email*", "username*"]
ACCOUNT_USERNAME_VALIDATORS = "intent.accounts.validators.username_validators"
ACCOUNT_EMAIL_VERIFICATION = "mandatory"
ACCOUNT_EMAIL_VERIFICATION_BY_CODE_ENABLED = True
ACCOUNT_EMAIL_VERIFICATION_BY_CODE_SUPPORTS_RESEND = True
ACCOUNT_LOGIN_BY_CODE_ENABLED = True
ACCOUNT_LOGIN_BY_CODE_SUPPORTS_RESEND = True
ACCOUNT_LOGIN_BY_CODE_TIMEOUT = 600
ACCOUNT_LOGOUT_ON_GET = False
SOCIALACCOUNT_PROVIDERS = {
    "github": {"SCOPE": ["read:user", "user:email"]},
}

# Provider is TBD (see concept.md); console output until then.
EMAIL_BACKEND = os.environ.get("EMAIL_BACKEND", "django.core.mail.backends.console.EmailBackend")
DEFAULT_FROM_EMAIL = os.environ.get("DEFAULT_FROM_EMAIL", "Intent <intent@localhost>")

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_DIRS = [BASE_DIR / "static"]

# Uploaded files go to S3-compatible storage (Tigris) when a bucket is configured,
# otherwise to the local filesystem. `fly storage create` sets these variable names.
if os.environ.get("BUCKET_NAME"):
    _default_storage = {
        "BACKEND": "storages.backends.s3.S3Storage",
        "OPTIONS": {
            "bucket_name": os.environ["BUCKET_NAME"],
            "endpoint_url": os.environ.get("AWS_ENDPOINT_URL_S3"),
            "region_name": os.environ.get("AWS_REGION", "auto"),
            "default_acl": None,
            "querystring_auth": True,
            "querystring_expire": 300,
            "file_overwrite": False,
        },
    }
else:
    _default_storage = {
        "BACKEND": "django.core.files.storage.FileSystemStorage",
        "OPTIONS": {"location": DATA_DIR / "media"},
    }

STORAGES = {
    "default": _default_storage,
    "staticfiles": {"BACKEND": "django.contrib.staticfiles.storage.StaticFilesStorage"},
}

LOGGING = {
    "version": 1,
    "disable_existing_loggers": False,
    "handlers": {"console": {"class": "logging.StreamHandler"}},
    "root": {"handlers": ["console"], "level": "INFO"},
}