"""
Django settings for backend project.

Generated by 'django-admin startproject' using Django 4.2.2.

For more information on this file, see
https://docs.djangoproject.com/en/4.1/topics/settings/

For the full list of settings and their values, see
https://docs.djangoproject.com/en/4.1/ref/settings/
"""
import os
import subprocess
import dotenv
from pathlib import Path

# Build paths inside the project like this: BASE_DIR / 'subdir'.
BASE_DIR = Path(__file__).resolve().parent.parent


def _git_commit():
    # deploy/dev/docker-compose.yml bind-mounts the repo's real .git dir at
    # /git (separate from BASE_DIR, which only has the backend/ subtree) -
    # point git at it explicitly there. Bare-metal dev has no such mount, but
    # BASE_DIR sits inside the real checkout so plain rev-parse finds it by
    # walking up. In prod, the build context is backend/ alone with no .git
    # anywhere, so both fail and we fall back to the GIT_COMMIT build-arg/env
    # var (see deploy/prod/Dockerfile.backend and playbook.yml).
    cmd = ['git', '--git-dir=/git'] if os.path.isdir('/git') else ['git']
    try:
        return subprocess.check_output(
            [*cmd, 'rev-parse', '--short', 'HEAD'], cwd=BASE_DIR, stderr=subprocess.DEVNULL
        ).decode().strip()
    except (subprocess.CalledProcessError, FileNotFoundError, OSError):
        return os.environ.get('GIT_COMMIT', 'unknown')

dotenv.load_dotenv(BASE_DIR / '.env')

# Quick-start development settings - unsuitable for production
# See https://docs.djangoproject.com/en/4.1/howto/deployment/checklist/

SECRET_KEY = os.environ.get('SECRET_KEY', None)
if SECRET_KEY is None:
    raise Exception('environment variable SECRET_KEY not set. try running `configure.py` or setting it manually')

DEBUG = os.environ.get('DEBUG', 'False').lower() == 'true'

# Application definition

TOOLSHED_VERSION = "0.0.0-dev.0"
GIT_COMMIT = _git_commit()

INSTALLED_APPS = [
    'django.contrib.admin',
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.messages',
    'django.contrib.staticfiles',
    'django_extensions',
    'rest_framework',
    'rest_framework.authtoken',
    'corsheaders',
    'drf_yasg',
    'authentication',
    'hostadmin',
    'files',
    'toolshed',
]

REST_FRAMEWORK = {
    'TEST_REQUEST_DEFAULT_FORMAT': 'json'
}

SWAGGER_SETTINGS = {
    'SECURITY_DEFINITIONS': {
        'api_key': {
            'type': 'apiKey',
            'in': 'header',
            'name': 'Authorization'
        }
    },
    'USE_SESSION_AUTH': False,
    'JSON_EDITOR': True,
    'DEFAULT_INFO': 'backend.urls.openapi_info',
}

MIDDLEWARE = [
    'django.middleware.security.SecurityMiddleware',
    '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',
]

ALLOWED_HOSTS = os.environ.get('ALLOWED_HOSTS', '').split(',')

CSRF_TRUSTED_ORIGINS = ['https://' + host for host in ALLOWED_HOSTS]

CORS_ALLOW_ALL_ORIGINS = True

USE_X_FORWARDED_HOST = True
SECURE_PROXY_SSL_HEADER = ('HTTP_X_FORWARDED_PROTO', 'https')

SERVE_X_ACCEL_REDIRECT = os.environ.get('SERVE_X_ACCEL_REDIRECT', 'False').lower() == 'true'

ROOT_URLCONF = 'backend.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 = 'backend.wsgi.application'

# Database
# https://docs.djangoproject.com/en/4.1/ref/settings/#databases

DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.sqlite3',
        'NAME': os.environ.get('TOOLSHED_DB_PATH', BASE_DIR / 'db.sqlite3'),
    }
}

AUTH_USER_MODEL = 'authentication.ToolshedUser'

# Password validation
# https://docs.djangoproject.com/en/4.1/ref/settings/#auth-password-validators

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',
    },
]

# Internationalization
# https://docs.djangoproject.com/en/4.1/topics/i18n/

LANGUAGE_CODE = 'en-us'

TIME_ZONE = 'UTC'

USE_I18N = True

USE_TZ = True

# Static files (CSS, JavaScript, Images)
# https://docs.djangoproject.com/en/4.1/howto/static-files/

STATIC_ROOT = 'staticfiles'
STATIC_URL = '/static/'

MEDIA_ROOT = os.environ.get('TOOLSHED_USERFILES_PATH', 'userfiles')
MEDIA_URL = '/media/'

# In prod, nginx (running as www-data) reads these files directly - see
# SERVE_X_ACCEL_REDIRECT and playbook.yml's `location /redirect_media/`.
# Pinned explicitly rather than left to the backend process's ambient umask,
# so group-read (www-data is added to the backend's system group) is
# guaranteed regardless of how the container is started.
FILE_UPLOAD_PERMISSIONS = 0o640
FILE_UPLOAD_DIRECTORY_PERMISSIONS = 0o750

# Default primary key field type
# https://docs.djangoproject.com/en/4.1/ref/settings/#default-auto-field

DEFAULT_AUTO_FIELD = 'django.db.models.BigAutoField'

STORAGES = {
    'default': {
        'BACKEND': 'django.core.files.storage.FileSystemStorage',
        'OPTIONS': {
            'base_url': MEDIA_URL,
            'location': BASE_DIR / MEDIA_ROOT
        },
    },
    'staticfiles': {
        'BACKEND': 'django.core.files.storage.FileSystemStorage',
        'OPTIONS': {
            'base_url': STATIC_URL,
            'location': BASE_DIR / STATIC_ROOT
        },
    },
}

DATA_UPLOAD_MAX_MEMORY_SIZE = 1024 * 1024 * 128  # 128 MB
TEST_RUNNER = 'backend.test_runner.FastTestRunner'
