"""
Django settings for bookstore project.

This example demonstrates how to configure universal_constraints
with a real-world bookstore application.
"""

import os
from pathlib import Path

# 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 = 'django-insecure-bookstore-example-key-change-in-production'

# SECURITY WARNING: don't run with debug turned on in production!
DEBUG = True

ALLOWED_HOSTS = []

# Application definition
INSTALLED_APPS = [
    'django.contrib.admin',
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.messages',
    'django.contrib.staticfiles',
    
    # Third-party apps
    'universal_constraints',
    
    # Local apps
    'books',
    'inventory',
    'customers',
]

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 = 'bookstore_project.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 = 'bookstore_project.wsgi.application'

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

# Multi-database setup demonstrating both scenarios:
# - default: Standard backend with constraints kept in DB schema
# - second_database: Wrapped backend with constraints removed from DB schema
DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.sqlite3',
        'NAME': BASE_DIR / 'bookstore.sqlite3',
    },
    'second_database': {
        'ENGINE': 'universal_constraints.backend',
        'WRAPPED_ENGINE': 'django.db.backends.sqlite3',
        'NAME': BASE_DIR / 'bookstore_second.sqlite3',
    }
}

# Database routing to split models across databases
DATABASE_ROUTERS = ['bookstore_project.routers.DatabaseRouter']

# Password validation
# https://docs.djangoproject.com/en/4.2/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/4.2/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/4.2/howto/static-files/

STATIC_URL = '/static/'
STATICFILES_DIRS = [
    BASE_DIR / 'static',
]

# Media files
MEDIA_URL = '/media/'
MEDIA_ROOT = BASE_DIR / 'media'

# Default primary key field type
# https://docs.djangoproject.com/en/4.2/ref/settings/#default-auto-field

DEFAULT_AUTO_FIELD = 'django.db.models.BigAutoField'

# Universal Constraints Configuration
# https://github.com/your-repo/django-universal-constraints

UNIVERSAL_CONSTRAINTS = {
    # Configuration for the 'default' database - constraints kept in DB schema
    'default': {
        'EXCLUDE_APPS': ['admin', 'auth', 'contenttypes', 'sessions'],
        'RACE_CONDITION_PROTECTION': True,
        'REMOVE_DB_CONSTRAINTS': False,  # Keep constraints in database
        'LOG_LEVEL': 'INFO',
    },
    # Configuration for the 'second_database' - constraints removed from DB schema
    'second_database': {
        'EXCLUDE_APPS': ['admin', 'auth', 'contenttypes', 'sessions'],
        'RACE_CONDITION_PROTECTION': True,
        'REMOVE_DB_CONSTRAINTS': True,   # Remove constraints from database
        'LOG_LEVEL': 'INFO',
    }
}

# Logging configuration
LOGGING = {
    'version': 1,
    'disable_existing_loggers': False,
    'handlers': {
        'console': {
            'class': 'logging.StreamHandler',
        },
    },
    'loggers': {
        'universal_constraints': {
            'handlers': ['console'],
            'level': 'INFO',
            'propagate': True,
        },
    },
}
