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 = [h.strip() for h in os.environ.get('ALLOWED_HOSTS', '*').split(',') if h.strip()]

# Reverse Proxy & SSL Configuration for Coolify / Traefik
SECURE_PROXY_SSL_HEADER = ('HTTP_X_FORWARDED_PROTO', 'https')
USE_X_FORWARDED_HOST = True
USE_X_FORWARDED_PORT = True

# CSRF & Trusted Origins Configuration
CSRF_TRUSTED_ORIGINS = [
    'http://localhost',
    'http://127.0.0.1',
    'https://*.op3n.link',
    'http://*.op3n.link',
]

raw_csrf = os.environ.get('CSRF_TRUSTED_ORIGINS', '')
if raw_csrf:
    for origin in raw_csrf.split(','):
        o = origin.strip()
        if o and o not in CSRF_TRUSTED_ORIGINS:
            CSRF_TRUSTED_ORIGINS.append(o)

for h in ALLOWED_HOSTS:
    if h and h != '*':
        if not h.startswith('http://') and not h.startswith('https://'):
            http_origin = f'http://{h}'
            https_origin = f'https://{h}'
            if http_origin not in CSRF_TRUSTED_ORIGINS:
                CSRF_TRUSTED_ORIGINS.append(http_origin)
            if https_origin not in CSRF_TRUSTED_ORIGINS:
                CSRF_TRUSTED_ORIGINS.append(https_origin)

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