import os
import logging
import sys
from pathlib import Path

import dj_database_url
from django.core.exceptions import ImproperlyConfigured

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

# Security settings
SECRET_KEY = os.getenv('DJANGO_SECRET_KEY', 'django-insecure-development-key')

DEBUG = os.getenv('DEBUG', 'False').lower() == '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',
    'django_celery_beat',
    'debug_toolbar',
    'users',
    'tgbot',
]

MIDDLEWARE = [
    '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',
    'debug_toolbar.middleware.DebugToolbarMiddleware',
]

ROOT_URLCONF = 'dtb.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 = 'dtb.wsgi.application'

# Database
DATABASES = {
    'default': dj_database_url.config(
        default=os.getenv('DATABASE_URL', 'sqlite:////data/db.sqlite3'),
        conn_max_age=600
    )
}

# 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_L10N = True
USE_TZ = True

# Static files (CSS, JavaScript, Images)
STATIC_URL = '/static/'
STATIC_ROOT = '/static'
STATICFILES_STORAGE = 'whitenoise.storage.CompressedManifestStaticFilesStorage'

# Telegram configuration
def get_telegram_token():
    token = os.getenv("TELEGRAM_TOKEN")
    if not token:
        raise ImproperlyConfigured("TELEGRAM_TOKEN must be set in environment")
    return token

TELEGRAM_TOKEN = get_telegram_token()
TELEGRAM_LOGS_CHAT_ID = os.getenv("TELEGRAM_LOGS_CHAT_ID")

# Celery configuration (optional)
CELERY_BROKER_URL = os.getenv('REDIS_URL', 'redis://localhost:6379/0')
CELERY_RESULT_BACKEND = os.getenv('REDIS_URL', 'redis://localhost:6379/0')
CELERY_ACCEPT_CONTENT = ['json']
CELERY_TASK_SERIALIZER = 'json'

# Security headers for production
if not DEBUG:
    SECURE_PROXY_SSL_HEADER = ('HTTP_X_FORWARDED_PROTO', 'https')
    SECURE_SSL_REDIRECT = True
    SESSION_COOKIE_SECURE = True
    CSRF_COOKIE_SECURE = True

# Internal IPs for debug toolbar
INTERNAL_IPS = [
    '127.0.0.1',
]

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

# Custom user model
AUTH_USER_MODEL = 'users.User'

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