"""
Base Django settings for KeepItGoing.

These settings are shared across all environments.
"""

import os
from pathlib import Path
from datetime import timedelta

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

# Application definition
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_simplejwt',
    'corsheaders',
    'django_filters',
    'django_celery_beat',

    # Local apps
    'users',
    'tasks',
    'sync',
    'notifications',
]

MIDDLEWARE = [
    'django.middleware.security.SecurityMiddleware',
    'whitenoise.middleware.WhiteNoiseMiddleware',
    'corsheaders.middleware.CorsMiddleware',
    '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 = 'config.urls'

TEMPLATES = [
    {
        'BACKEND': 'django.template.backends.django.DjangoTemplates',
        'DIRS': [BASE_DIR / 'templates'],
        'APP_DIRS': True,
        'OPTIONS': {
            'context_processors': [
                'django.template.context_processors.request',
                'django.contrib.auth.context_processors.auth',
                'django.contrib.messages.context_processors.messages',
            ],
        },
    },
]

WSGI_APPLICATION = 'config.wsgi.application'

# Custom user model
AUTH_USER_MODEL = 'users.User'

# Authentication backends
AUTHENTICATION_BACKENDS = [
    'users.backends.EmailVerifiedApprovedBackend',
]

# 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 = [BASE_DIR / 'static']

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

# File Upload Settings
FILE_UPLOAD_MAX_MEMORY_SIZE = 5 * 1024 * 1024  # 5MB max file size in memory
DATA_UPLOAD_MAX_MEMORY_SIZE = 5 * 1024 * 1024  # 5MB max request body size

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

# Django REST Framework
REST_FRAMEWORK = {
    'DEFAULT_AUTHENTICATION_CLASSES': [
        'rest_framework_simplejwt.authentication.JWTAuthentication',
        'rest_framework.authentication.SessionAuthentication',
    ],
    'DEFAULT_PERMISSION_CLASSES': [
        'rest_framework.permissions.IsAuthenticated',
    ],
    'DEFAULT_FILTER_BACKENDS': [
        'django_filters.rest_framework.DjangoFilterBackend',
        'rest_framework.filters.SearchFilter',
        'rest_framework.filters.OrderingFilter',
    ],
    'DEFAULT_PAGINATION_CLASS': 'rest_framework.pagination.PageNumberPagination',
    'PAGE_SIZE': 50,
    'DEFAULT_THROTTLE_CLASSES': [
        'rest_framework.throttling.AnonRateThrottle',
        'rest_framework.throttling.UserRateThrottle',
    ],
    'DEFAULT_THROTTLE_RATES': {
        'anon': '100/hour',  # Anonymous users: 100 requests per hour
        'user': '1000/hour',  # Authenticated users: 1000 requests per hour
        'login': '10/hour',  # Login attempts: 10 per hour
        'register': '5/hour',  # Registration attempts: 5 per hour
        'sync': '100/hour',  # Sync endpoint: 100 per hour
    },
}

# JWT Settings
SIMPLE_JWT = {
    'ACCESS_TOKEN_LIFETIME': timedelta(minutes=60),
    'REFRESH_TOKEN_LIFETIME': timedelta(days=7),
    'ROTATE_REFRESH_TOKENS': True,
    'BLACKLIST_AFTER_ROTATION': True,
    'UPDATE_LAST_LOGIN': True,
    'AUTH_HEADER_TYPES': ('Bearer',),
}

# Celery Configuration
CELERY_TIMEZONE = 'UTC'
CELERY_TASK_TRACK_STARTED = True
CELERY_TASK_TIME_LIMIT = 30 * 60  # 30 minutes
CELERY_ACCEPT_CONTENT = ['json']
CELERY_TASK_SERIALIZER = 'json'
CELERY_RESULT_SERIALIZER = 'json'

# Feature flags
SAAS_MODE = os.environ.get('SAAS_MODE', 'False').lower() == 'true'
BILLING_ENABLED = SAAS_MODE
USAGE_LIMITS_ENABLED = SAAS_MODE

# Login settings
LOGIN_URL = '/login/'
LOGIN_REDIRECT_URL = '/'
LOGOUT_REDIRECT_URL = '/login/'

# Email verification settings
EMAIL_VERIFICATION_TOKEN_EXPIRY_HOURS = int(
    os.environ.get('EMAIL_VERIFICATION_TOKEN_EXPIRY_HOURS', 24)
)
SITE_DOMAIN = os.environ.get('SITE_DOMAIN', 'localhost:8000')