import os
from pathlib import Path
from dotenv import load_dotenv

load_dotenv()

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

SECRET_KEY = os.environ.get('SECRET_KEY', 'django-insecure-key-shiftplan-change-me-in-production')

DEBUG = os.environ.get('DEBUG', 'True') == 'True'

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

# CSRF & Origin configuration for reverse proxies (Coolify, Traefik, custom domains)
raw_csrf = os.environ.get('CSRF_TRUSTED_ORIGINS', '')
if raw_csrf:
    CSRF_TRUSTED_ORIGINS = [o.strip() for o in raw_csrf.split(',') if o.strip()]
else:
    CSRF_TRUSTED_ORIGINS = ['http://*', 'https://*']

INSTALLED_APPS = [
    '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',
    'corsheaders',
    # Local apps
    'apps.users',
    'apps.events',
    'apps.branding',
]

AUTH_USER_MODEL = 'users.User'

MIDDLEWARE = [
    'corsheaders.middleware.CorsMiddleware',
    'django.middleware.security.SecurityMiddleware',
    'whitenoise.middleware.WhiteNoiseMiddleware',
    '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 = 'shiftplan_backend.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 = 'shiftplan_backend.wsgi.application'

# Database configuration: Postgres with SQLite fallback
DB_ENGINE = os.environ.get('POSTGRES_DB', None)
if DB_ENGINE:
    DATABASES = {
        'default': {
            'ENGINE': 'django.db.backends.postgresql',
            'NAME': os.environ.get('POSTGRES_DB', 'shiftplan_db'),
            'USER': os.environ.get('POSTGRES_USER', 'shiftplan_user'),
            'PASSWORD': os.environ.get('POSTGRES_PASSWORD', 'shiftplan_password'),
            'HOST': os.environ.get('POSTGRES_HOST', 'db'),
            'PORT': os.environ.get('POSTGRES_PORT', '5432'),
        }
    }
else:
    DATABASES = {
        'default': {
            'ENGINE': 'django.db.backends.sqlite3',
            'NAME': BASE_DIR / 'db.sqlite3',
        }
    }

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 = 'de-de'
TIME_ZONE = 'Europe/Berlin'
USE_I18N = True
USE_TZ = True

STATIC_URL = 'static/'
STATIC_ROOT = BASE_DIR / 'staticfiles'
STATICFILES_STORAGE = 'whitenoise.storage.CompressedManifestStaticFilesStorage'

DEFAULT_AUTO_FIELD = 'django.db.models.BigAutoField'

REST_FRAMEWORK = {
    'DEFAULT_AUTHENTICATION_CLASSES': [
        'rest_framework.authentication.TokenAuthentication',
        'rest_framework.authentication.SessionAuthentication',
    ],
    'DEFAULT_PERMISSION_CLASSES': [
        'rest_framework.permissions.IsAuthenticatedOrReadOnly',
    ],
}

CORS_ALLOW_ALL_ORIGINS = True
CORS_ALLOW_CREDENTIALS = True