import os
import sys
import time
from pathlib import Path
from urllib.parse import urlsplit

BASE_DIR = Path(__file__).resolve().parent.parent
STATIC_ASSET_VERSION = os.getenv('STATIC_ASSET_VERSION', str(int(time.time())))

def _split_csv_env(name: str, default: str = ''):
    return [item.strip() for item in os.getenv(name, default).split(',') if item.strip()]

def _append_unique(items, value):
    if value and value not in items:
        items.append(value)

def _hostname_from_url(url: str) -> str:
    try:
        return (urlsplit(url).hostname or '').strip()
    except ValueError:
        return ''

SECRET_KEY = os.getenv('DJANGO_SECRET_KEY', 'unsafe-dev-key')
DEBUG = os.getenv('DJANGO_DEBUG', '0') == '1'
APP_DOMAIN = os.getenv('APP_DOMAIN', '').strip()
APP_BASE_URL = os.getenv('APP_BASE_URL', '').strip().rstrip('/')
ALLOWED_HOSTS = _split_csv_env('DJANGO_ALLOWED_HOSTS', 'localhost,127.0.0.1')
CSRF_TRUSTED_ORIGINS = _split_csv_env('DJANGO_CSRF_TRUSTED_ORIGINS', '')
_append_unique(ALLOWED_HOSTS, APP_DOMAIN)
_append_unique(ALLOWED_HOSTS, _hostname_from_url(APP_BASE_URL))
_append_unique(CSRF_TRUSTED_ORIGINS, APP_BASE_URL)

# Security hardening
SESSION_COOKIE_HTTPONLY = True
SESSION_COOKIE_SAMESITE = os.getenv('DJANGO_SESSION_COOKIE_SAMESITE', 'Lax')
CSRF_COOKIE_SAMESITE = os.getenv('DJANGO_CSRF_COOKIE_SAMESITE', 'Lax')
SECURE_CONTENT_TYPE_NOSNIFF = True
SECURE_REFERRER_POLICY = os.getenv('DJANGO_SECURE_REFERRER_POLICY', 'same-origin')
X_FRAME_OPTIONS = os.getenv('DJANGO_X_FRAME_OPTIONS', 'DENY')
SECURE_SSL_REDIRECT = os.getenv('DJANGO_SECURE_SSL_REDIRECT', '0') == '1'
SECURE_PROXY_SSL_HEADER = ('HTTP_X_FORWARDED_PROTO', 'https')
_secure_cookies = os.getenv('DJANGO_SECURE_COOKIES', '0') == '1'
SESSION_COOKIE_SECURE = _secure_cookies
CSRF_COOKIE_SECURE = _secure_cookies

# Upload guards
DATA_UPLOAD_MAX_MEMORY_SIZE = int(os.getenv('DJANGO_DATA_UPLOAD_MAX_MEMORY_SIZE', str(10 * 1024 * 1024)))
FILE_UPLOAD_MAX_MEMORY_SIZE = int(os.getenv('DJANGO_FILE_UPLOAD_MAX_MEMORY_SIZE', str(5 * 1024 * 1024)))

CACHES = {
    'default': {
        'BACKEND': 'django.core.cache.backends.locmem.LocMemCache',
        'LOCATION': 'workdock-default-cache',
    }
}

SESSION_COOKIE_AGE = int(os.getenv('DJANGO_SESSION_COOKIE_AGE', str(60 * 60 * 8)))
SESSION_SAVE_EVERY_REQUEST = os.getenv('DJANGO_SESSION_SAVE_EVERY_REQUEST', '1') == '1'
SESSION_EXPIRE_AT_BROWSER_CLOSE = os.getenv('DJANGO_SESSION_EXPIRE_AT_BROWSER_CLOSE', '1') == '1'
SESSION_IDLE_TIMEOUT_SECONDS = int(os.getenv('SESSION_IDLE_TIMEOUT_SECONDS', str(60 * 30)))
SENSITIVE_ACTION_REAUTH_SECONDS = int(os.getenv('SENSITIVE_ACTION_REAUTH_SECONDS', str(60 * 20)))

RATE_LIMIT_LOGIN_LIMIT = int(os.getenv('RATE_LIMIT_LOGIN_LIMIT', '8'))
RATE_LIMIT_LOGIN_WINDOW = int(os.getenv('RATE_LIMIT_LOGIN_WINDOW', '300'))
RATE_LIMIT_PASSWORD_RESET_LIMIT = int(os.getenv('RATE_LIMIT_PASSWORD_RESET_LIMIT', '5'))
RATE_LIMIT_PASSWORD_RESET_WINDOW = int(os.getenv('RATE_LIMIT_PASSWORD_RESET_WINDOW', '600'))
RATE_LIMIT_ADMIN_ACTION_LIMIT = int(os.getenv('RATE_LIMIT_ADMIN_ACTION_LIMIT', '20'))
RATE_LIMIT_ADMIN_ACTION_WINDOW = int(os.getenv('RATE_LIMIT_ADMIN_ACTION_WINDOW', '300'))
RATE_LIMIT_ENABLED = os.getenv('RATE_LIMIT_ENABLED', '1') == '1'
RUN_SECURITY_CHECKS_DURING_TESTS = os.getenv('RUN_SECURITY_CHECKS_DURING_TESTS', '0') == '1'

INSTALLED_APPS = [
    'django.contrib.admin',
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.messages',
    'django.contrib.staticfiles',
    'workflows',
]

MIDDLEWARE = [
    'django.middleware.security.SecurityMiddleware',
    'django.contrib.sessions.middleware.SessionMiddleware',
    'django.middleware.locale.LocaleMiddleware',
    'django.middleware.common.CommonMiddleware',
    'workflows.middleware.RequestIDMiddleware',
    'workflows.middleware.RateLimitMiddleware',
    'django.middleware.csrf.CsrfViewMiddleware',
    'django.contrib.auth.middleware.AuthenticationMiddleware',
    'workflows.middleware.AuthSessionHardeningMiddleware',
    'django.contrib.messages.middleware.MessageMiddleware',
    'django.middleware.clickjacking.XFrameOptionsMiddleware',
    'workflows.middleware.TrialModeMiddleware',
]

ROOT_URLCONF = 'config.urls'

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

WSGI_APPLICATION = 'config.wsgi.application'
ASGI_APPLICATION = 'config.asgi.application'

DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.postgresql',
        'NAME': os.getenv('POSTGRES_DB', 'workdock'),
        'USER': os.getenv('POSTGRES_USER', 'workdock'),
        'PASSWORD': os.getenv('POSTGRES_PASSWORD', 'workdock'),
        'HOST': os.getenv('POSTGRES_HOST', 'db'),
        'PORT': int(os.getenv('POSTGRES_PORT', '5432')),
    }
}

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 = os.getenv('DJANGO_LANGUAGE_CODE', 'de')
LANGUAGES = [
    ('de', 'Deutsch'),
    ('en', 'English'),
]
LOCALE_PATHS = [BASE_DIR / 'locale']
TIME_ZONE = 'Europe/Berlin'
USE_I18N = True
USE_TZ = True

STATIC_URL = '/static/'
STATIC_ROOT = BASE_DIR / 'staticfiles'
STATIC_ROOT.mkdir(parents=True, exist_ok=True)
STORAGES = {
    'default': {
        'BACKEND': 'django.core.files.storage.FileSystemStorage',
    },
    'staticfiles': {
        'BACKEND': 'django.contrib.staticfiles.storage.ManifestStaticFilesStorage',
    },
}
MEDIA_URL = '/media/'
MEDIA_ROOT = BASE_DIR / 'media'

DEFAULT_AUTO_FIELD = 'django.db.models.BigAutoField'
LOGIN_URL = '/accounts/login/'
LOGIN_REDIRECT_URL = '/'
LOGOUT_REDIRECT_URL = '/accounts/login/'

EMAIL_BACKEND = 'django.core.mail.backends.smtp.EmailBackend'
EMAIL_HOST = os.getenv('EMAIL_HOST', 'mailhog')
EMAIL_PORT = int(os.getenv('EMAIL_PORT', '1025'))
EMAIL_HOST_USER = os.getenv('EMAIL_HOST_USER', '')
EMAIL_HOST_PASSWORD = os.getenv('EMAIL_HOST_PASSWORD', '')
EMAIL_USE_TLS = os.getenv('EMAIL_USE_TLS', '0') == '1'
EMAIL_USE_SSL = os.getenv('EMAIL_USE_SSL', '0') == '1'
DEFAULT_FROM_EMAIL = os.getenv('DEFAULT_FROM_EMAIL', 'onboarding@example.local')
TEST_NOTIFICATION_EMAIL = os.getenv('TEST_NOTIFICATION_EMAIL', 'hr@example.local')
IT_ONBOARDING_NOTIFICATION_EMAIL = os.getenv('IT_ONBOARDING_NOTIFICATION_EMAIL', 'it@workdock.de')
GENERAL_INFO_NOTIFICATION_EMAIL = os.getenv('GENERAL_INFO_NOTIFICATION_EMAIL', 'info@workdock.de')
BUSINESS_CARD_NOTIFICATION_EMAIL = os.getenv('BUSINESS_CARD_NOTIFICATION_EMAIL', 'cards@workdock.de')
HR_WORKS_NOTIFICATION_EMAIL = os.getenv('HR_WORKS_NOTIFICATION_EMAIL', 'hr@workdock.de')
KEY_NOTIFICATION_EMAIL = os.getenv('KEY_NOTIFICATION_EMAIL', 'keys@workdock.de')
EMAIL_TEST_MODE = os.getenv('EMAIL_TEST_MODE', '0') == '1'
EMAIL_TEST_REDIRECT = os.getenv('EMAIL_TEST_REDIRECT', TEST_NOTIFICATION_EMAIL)

REDIS_URL = os.getenv('REDIS_URL', 'redis://redis:6379/0')
CELERY_BROKER_URL = REDIS_URL
CELERY_RESULT_BACKEND = REDIS_URL
CELERY_TASK_ALWAYS_EAGER = os.getenv('CELERY_TASK_ALWAYS_EAGER', '0') == '1'
CELERY_BROKER_CONNECTION_RETRY_ON_STARTUP = os.getenv('CELERY_BROKER_CONNECTION_RETRY_ON_STARTUP', '1') == '1'

NEXTCLOUD_BASE_URL = os.getenv('NEXTCLOUD_BASE_URL', '').rstrip('/')
NEXTCLOUD_USERNAME = os.getenv('NEXTCLOUD_USERNAME', '')
NEXTCLOUD_PASSWORD = os.getenv('NEXTCLOUD_PASSWORD', '')
NEXTCLOUD_DIRECTORY = os.getenv('NEXTCLOUD_DIRECTORY', '').strip('/')
NEXTCLOUD_ENABLED = os.getenv('NEXTCLOUD_ENABLED', '0') == '1'

PDF_OUTPUT_DIR = Path(os.getenv('PDF_OUTPUT_DIR', str(MEDIA_ROOT / 'pdfs')))
PDF_OUTPUT_DIR.mkdir(parents=True, exist_ok=True)
PDF_TEMPLATES_DIR = Path(os.getenv('PDF_TEMPLATES_DIR', str(BASE_DIR / 'workflows' / 'pdf_assets')))
EMAIL_TEXT_DIR = MEDIA_ROOT / 'email_text'
EMAIL_TEXT_DIR.mkdir(parents=True, exist_ok=True)
BACKUP_OUTPUT_DIR = BASE_DIR / 'backups'
BACKUP_OUTPUT_DIR.mkdir(parents=True, exist_ok=True)
ONBOARDING_SHARED_PDF_LINK = os.getenv('ONBOARDING_SHARED_PDF_LINK', '')
SMTP_TIMEOUT_SECONDS = int(os.getenv('SMTP_TIMEOUT_SECONDS', '20'))

NEXTCLOUD_UPLOAD_TIMEOUT_SECONDS = int(os.getenv('NEXTCLOUD_UPLOAD_TIMEOUT_SECONDS', '30'))
NEXTCLOUD_UPLOAD_RETRIES = int(os.getenv('NEXTCLOUD_UPLOAD_RETRIES', '2'))

LOG_LEVEL = os.getenv('DJANGO_LOG_LEVEL', 'INFO')
LOG_JSON = os.getenv('DJANGO_LOG_JSON', '1') == '1'

LOGGING = {
    'version': 1,
    'disable_existing_loggers': False,
    'filters': {
        'request_context': {
            '()': 'workflows.logging_utils.RequestContextFilter',
        },
    },
    'formatters': {
        'structured': {
            '()': 'workflows.logging_utils.JsonFormatter',
        },
        'verbose': {
            'format': '[%(asctime)s] %(levelname)s %(name)s request_id=%(request_id)s task_id=%(task_id)s %(message)s',
        },
    },
    'handlers': {
        'console': {
            'class': 'logging.StreamHandler',
            'filters': ['request_context'],
            'formatter': 'structured' if LOG_JSON else 'verbose',
        },
    },
    'root': {
        'handlers': ['console'],
        'level': LOG_LEVEL,
    },
    'loggers': {
        'django': {
            'handlers': ['console'],
            'level': LOG_LEVEL,
            'propagate': False,
        },
        'workflows': {
            'handlers': ['console'],
            'level': LOG_LEVEL,
            'propagate': False,
        },
        'celery': {
            'handlers': ['console'],
            'level': LOG_LEVEL,
            'propagate': False,
        },
    },
}