import io
import os
from pathlib import Path

import environ
import google.auth
from google.cloud import secretmanager

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


env = environ.Env(DEBUG=(bool, False))
env_file = os.path.join(BASE_DIR, ".env")

# Attempt to load the Project ID into the environment, safely failing on error.
try:
    _, os.environ["GOOGLE_CLOUD_PROJECT"] = google.auth.default()
except google.auth.exceptions.DefaultCredentialsError:
    pass

if os.path.isfile(env_file):
    # Use a local secret file, if provided
    env.read_env(env_file)
elif os.environ.get("GOOGLE_CLOUD_PROJECT", None):
    # Pull secrets from Secret Manager
    project_id = os.environ.get("GOOGLE_CLOUD_PROJECT")

    client = secretmanager.SecretManagerServiceClient()
    settings_name = os.environ.get("SETTINGS_NAME", "django_settings")
    name = f"projects/{project_id}/secrets/{settings_name}/versions/latest"
    payload = client.access_secret_version(name=name).payload.data.decode("UTF-8")

    env.read_env(io.StringIO(payload))
else:
    raise Exception("No local .env or GOOGLE_CLOUD_PROJECT detected. No secrets found.")

SECRET_KEY = env("SECRET_KEY")

DEBUG = env("DEBUG")

ALLOWED_HOSTS = ["*"]


INSTALLED_APPS = [
    "django.contrib.admin",
    "django.contrib.auth",
    "django.contrib.contenttypes",
    "django.contrib.sessions",
    "django.contrib.messages",
    "django.contrib.staticfiles",
    "gametracker",
    "storages",
]

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",
]

ROOT_URLCONF = "gametracker.urls"

TEMPLATES = [
    {
        "BACKEND": "django.template.backends.django.DjangoTemplates",
        "DIRS": [],
        "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 = "gametracker.wsgi.application"

# Use django-environ to parse DATABASE_URL from secrets
DATABASES = {"default": env.db()}

# If using Cloud SQL Auth Proxy, change the database values accordingly.
if os.environ.get("USE_CLOUD_SQL_AUTH_PROXY"):
    DATABASES["default"]["HOST"] = "127.0.0.1"
    DATABASES["default"]["PORT"] = 5432


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_L10N = True
USE_TZ = True


STATIC_ROOT = "/static/"
STATIC_URL = "/static/"

# Define static storage via django-storages[google]
if env("GS_BUCKET_NAME"):
    GS_BUCKET_NAME = env("GS_BUCKET_NAME")
    STATICFILES_DIRS = []
    DEFAULT_FILE_STORAGE = "storages.backends.gcloud.GoogleCloudStorage"
    STATICFILES_STORAGE = "storages.backends.gcloud.GoogleCloudStorage"
    GS_DEFAULT_ACL = "publicRead"

DEFAULT_AUTO_FIELD = "django.db.models.BigAutoField"