"""
Production Django Settings Template
Copy this to your Django project and customize as needed.
"""

import os
from pathlib import Path
from decouple import config
import dj_database_url

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

# SECURITY WARNING: keep the secret key used in production secret!
SECRET_KEY = config('SECRET_KEY')

# SECURITY WARNING: don't run with debug turned on in production!
DEBUG = config('DEBUG', default=False, cast=bool)

ALLOWED_HOSTS = config('ALLOWED_HOSTS', cast=lambda v: [s.strip() for s in v.split(',')])

# Application definition
INSTALLED_APPS = [
    'django.contrib.admin',
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.messages',
    'django.contrib.staticfiles',
    # Add your apps here
    'core',
]

MIDDLEWARE = [
    'django.middleware.security.SecurityMiddleware',
    'whitenoise.middleware.WhiteNoiseMiddleware',  # Static files middleware
    '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 = 'demo_project.urls'  # Change to your project name

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 = 'demo_project.wsgi.application'  # Change to your project name

# Database
# https://docs.djangoproject.com/en/4.2/ref/settings/#databases

# Primary database configuration - supports both SQLite and PostgreSQL
DATABASE_URL = config('DATABASE_URL', default=None)

if DATABASE_URL:
    # Production: Use DATABASE_URL (recommended)
    DATABASES = {
        'default': dj_database_url.parse(DATABASE_URL)
    }
else:
    # Development: Use SQLite
    DATABASES = {
        'default': {
            'ENGINE': 'django.db.backends.sqlite3',
            'NAME': BASE_DIR / 'db.sqlite3',
        }
    }

# Password validation
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
LANGUAGE_CODE = 'en-us'
TIME_ZONE = 'UTC'
USE_I18N = True
USE_TZ = True

# Static files (CSS, JavaScript, Images)
STATIC_URL = '/static/'
STATIC_ROOT = BASE_DIR / 'staticfiles'
STATICFILES_DIRS = [
    # Add your static directories here if needed
    # BASE_DIR / 'static',
]

# Media files (user uploads)
MEDIA_URL = '/media/'
MEDIA_ROOT = BASE_DIR / 'media'

# Static files storage
STATICFILES_STORAGE = 'whitenoise.storage.CompressedManifestStaticFilesStorage'

# Default primary key field type
DEFAULT_AUTO_FIELD = 'django.db.models.BigAutoField'

# Security settings for production
if not DEBUG:
    # HTTPS settings
    SECURE_SSL_REDIRECT = config('SECURE_SSL_REDIRECT', default=False, cast=bool)
    SECURE_PROXY_SSL_HEADER = ('HTTP_X_FORWARDED_PROTO', 'https')
    
    # Security headers
    SECURE_BROWSER_XSS_FILTER = True
    SECURE_CONTENT_TYPE_NOSNIFF = True
    SECURE_HSTS_SECONDS = 31536000  # 1 year
    SECURE_HSTS_INCLUDE_SUBDOMAINS = True
    SECURE_HSTS_PRELOAD = True
    
    # Session security
    SESSION_COOKIE_SECURE = SECURE_SSL_REDIRECT
    SESSION_COOKIE_HTTPONLY = True
    SESSION_COOKIE_AGE = 3600  # 1 hour
    
    # CSRF security
    CSRF_COOKIE_SECURE = SECURE_SSL_REDIRECT
    CSRF_COOKIE_HTTPONLY = True
    
    # Additional security
    X_FRAME_OPTIONS = 'DENY'
    SECURE_REFERRER_POLICY = 'same-origin'

# Logging configuration
LOGGING = {
    'version': 1,
    'disable_existing_loggers': False,
    'formatters': {
        'verbose': {
            'format': '{levelname} {asctime} {module} {process:d} {thread:d} {message}',
            'style': '{',
        },
        'simple': {
            'format': '{levelname} {message}',
            'style': '{',
        },
    },
    'handlers': {
        'file': {
            'level': 'INFO',
            'class': 'logging.handlers.RotatingFileHandler',
            'filename': BASE_DIR / 'logs' / 'django.log',
            'maxBytes': 1024*1024*15,  # 15MB
            'backupCount': 10,
            'formatter': 'verbose',
        },
        'console': {
            'level': 'INFO',
            'class': 'logging.StreamHandler',
            'formatter': 'simple',
        },
    },
    'root': {
        'handlers': ['console', 'file'] if not DEBUG else ['console'],
        'level': 'INFO',
    },
    'loggers': {
        'django': {
            'handlers': ['console', 'file'] if not DEBUG else ['console'],
            'level': 'INFO',
            'propagate': False,
        },
    },
}

# Create logs directory if it doesn't exist
if not DEBUG:
    (BASE_DIR / 'logs').mkdir(exist_ok=True)

# Email configuration (optional)
if not DEBUG:
    EMAIL_BACKEND = 'django.core.mail.backends.smtp.EmailBackend'
    EMAIL_HOST = config('EMAIL_HOST', default='localhost')
    EMAIL_PORT = config('EMAIL_PORT', default=587, cast=int)
    EMAIL_USE_TLS = config('EMAIL_USE_TLS', default=True, cast=bool)
    EMAIL_HOST_USER = config('EMAIL_HOST_USER', default='')
    EMAIL_HOST_PASSWORD = config('EMAIL_HOST_PASSWORD', default='')
    DEFAULT_FROM_EMAIL = config('DEFAULT_FROM_EMAIL', default='noreply@yourdomain.com')

# Cache configuration (optional - uncomment to use Redis)
# CACHES = {
#     'default': {
#         'BACKEND': 'django_redis.cache.RedisCache',
#         'LOCATION': config('REDIS_URL', default='redis://127.0.0.1:6379/1'),
#         'OPTIONS': {
#             'CLIENT_CLASS': 'django_redis.client.DefaultClient',
#         }
#     }
# }

# Session configuration (optional - uncomment to use Redis for sessions)
# SESSION_ENGINE = 'django.contrib.sessions.backends.cache'
# SESSION_CACHE_ALIAS = 'default'