"""
Django settings for mac_attendance project.

Generated by 'django-admin startproject' using Django 5.2.6.

For more information on this file, see
https://docs.djangoproject.com/en/5.2/topics/settings/

For the full list of settings and their values, see
https://docs.djangoproject.com/en/5.2/ref/settings/
"""

from pathlib import Path
from decouple import config

BASE_DIR = Path(__file__).resolve().parent.parent

SECRET_KEY = config('SECRET_KEY')

DEBUG = config('DEBUG', default=False, cast=bool)

ALLOWED_HOSTS = config('ALLOWED_HOSTS', default='localhost,127.0.0.1').split(',')

INSTALLED_APPS = [
    'django.contrib.admin',
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.messages',
    'django.contrib.staticfiles',
    'rest_framework',
    'rest_framework_simplejwt',
    'corsheaders',
    'import_export',
    'authentication',
    'events',
    'attendance',
]

MIDDLEWARE = [
    'corsheaders.middleware.CorsMiddleware',
    'django.middleware.security.SecurityMiddleware',
    'django.contrib.sessions.middleware.SessionMiddleware',
    'django.middleware.common.CommonMiddleware',
    'mac_attendance.middleware.DisableCSRFOnAPIMiddleware',  # Exentar API de CSRF (usamos JWT)
    'django.middleware.csrf.CsrfViewMiddleware',
    'django.contrib.auth.middleware.AuthenticationMiddleware',
    'django.contrib.messages.middleware.MessageMiddleware',
    'django.middleware.clickjacking.XFrameOptionsMiddleware',
    'mac_attendance.middleware.AuditMiddleware',  # Auditoría de seguridad
]

# Rate Limiting Configuration
RATELIMIT_ENABLE = config('RATELIMIT_ENABLE', default=True, cast=bool)
RATELIMIT_USE_CACHE = 'default'  # Usar cache por defecto (memory en dev)

ROOT_URLCONF = 'mac_attendance.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 = 'mac_attendance.wsgi.application'

# Database Configuration - PostgreSQL
DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.postgresql',
        'NAME': config('DB_NAME', default='mac_attendance'),
        'USER': config('DB_USER', default='mac_user'),
        'PASSWORD': config('DB_PASSWORD', default='mac_password_2024_secure'),
        'HOST': config('DB_HOST', default='db'),
        'PORT': config('DB_PORT', default='5432'),
        'CONN_MAX_AGE': 600,  # Conexiones persistentes para mejor rendimiento
        'OPTIONS': {
            'connect_timeout': 10,
        }
    }
}

# Cache Configuration (para rate limiting)
CACHES = {
    'default': {
        'BACKEND': 'django.core.cache.backends.locmem.LocMemCache',
        'LOCATION': 'ratelimit-cache',
    }
}

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 = 'es-mx'
TIME_ZONE = 'America/Mexico_City'
USE_I18N = True
USE_TZ = True

STATIC_URL = '/static/'
STATIC_ROOT = BASE_DIR / 'staticfiles'

MEDIA_URL = '/media/'
MEDIA_ROOT = BASE_DIR / 'media'

DEFAULT_AUTO_FIELD = 'django.db.models.BigAutoField'

# Security Settings for Production
if not DEBUG:
    # HTTPS/SSL Settings
    SECURE_SSL_REDIRECT = config('SECURE_SSL_REDIRECT', default=True, cast=bool)
    SESSION_COOKIE_SECURE = config('SESSION_COOKIE_SECURE', default=True, cast=bool)
    CSRF_COOKIE_SECURE = config('CSRF_COOKIE_SECURE', default=True, cast=bool)

    # HSTS (HTTP Strict Transport Security)
    SECURE_HSTS_SECONDS = config('SECURE_HSTS_SECONDS', default=31536000, cast=int)  # 1 año
    SECURE_HSTS_INCLUDE_SUBDOMAINS = config('SECURE_HSTS_INCLUDE_SUBDOMAINS', default=True, cast=bool)
    SECURE_HSTS_PRELOAD = config('SECURE_HSTS_PRELOAD', default=True, cast=bool)

    # Security Headers
    SECURE_CONTENT_TYPE_NOSNIFF = True
    SECURE_BROWSER_XSS_FILTER = True
    X_FRAME_OPTIONS = 'DENY'

    # Proxy Settings (para uso detrás de nginx/apache)
    SECURE_PROXY_SSL_HEADER = ('HTTP_X_FORWARDED_PROTO', 'https')

# CORS settings
CORS_ALLOWED_ORIGINS = config(
    'CORS_ALLOWED_ORIGINS',
    default='http://localhost,http://127.0.0.1,http://localhost:5173,http://127.0.0.1:5173'
).split(',')

CORS_ALLOW_CREDENTIALS = True

# CSRF Settings - Exentar rutas de API ya que usamos JWT
CSRF_TRUSTED_ORIGINS = config(
    'CSRF_TRUSTED_ORIGINS',
    default='http://localhost,http://127.0.0.1'
).split(',')

# Exentar todas las rutas de API del CSRF check (usamos JWT para seguridad)
CSRF_EXEMPT_URLS = [r'^api/.*$']

# Django REST Framework
REST_FRAMEWORK = {
    'DEFAULT_AUTHENTICATION_CLASSES': [
        'rest_framework_simplejwt.authentication.JWTAuthentication',
        'rest_framework.authentication.SessionAuthentication',  # Mantener para Django admin
    ],
    'DEFAULT_PERMISSION_CLASSES': [
        'rest_framework.permissions.IsAuthenticated',
    ],
    'EXCEPTION_HANDLER': 'mac_attendance.exceptions.custom_exception_handler',
}

# JWT Settings
from datetime import timedelta

SIMPLE_JWT = {
    'ACCESS_TOKEN_LIFETIME': timedelta(hours=1),
    'REFRESH_TOKEN_LIFETIME': timedelta(days=7),
    'ROTATE_REFRESH_TOKENS': True,
    'BLACKLIST_AFTER_ROTATION': False,
    'UPDATE_LAST_LOGIN': True,

    'ALGORITHM': 'HS256',
    'SIGNING_KEY': SECRET_KEY,
    'VERIFYING_KEY': None,

    'AUTH_HEADER_TYPES': ('Bearer',),
    'AUTH_HEADER_NAME': 'HTTP_AUTHORIZATION',
    'USER_ID_FIELD': 'id',
    'USER_ID_CLAIM': 'user_id',

    'AUTH_TOKEN_CLASSES': ('rest_framework_simplejwt.tokens.AccessToken',),
    'TOKEN_TYPE_CLAIM': 'token_type',
}

# Logging Configuration
LOGGING = {
    'version': 1,
    'disable_existing_loggers': False,
    'formatters': {
        'verbose': {
            'format': '{levelname} {asctime} {module} {process:d} {thread:d} {message}',
            'style': '{',
        },
        'simple': {
            'format': '{levelname} {asctime} {message}',
            'style': '{',
        },
        'audit': {
            'format': '[AUDIT] {asctime} {levelname} {message}',
            'style': '{',
        },
    },
    'handlers': {
        'console': {
            'class': 'logging.StreamHandler',
            'formatter': 'simple',
        },
        'file': {
            'class': 'logging.FileHandler',
            'filename': BASE_DIR / 'logs' / 'django.log',
            'formatter': 'verbose',
        },
        'security_file': {
            'class': 'logging.FileHandler',
            'filename': BASE_DIR / 'logs' / 'security.log',
            'formatter': 'audit',
        },
        'audit_file': {
            'class': 'logging.FileHandler',
            'filename': BASE_DIR / 'logs' / 'audit.log',
            'formatter': 'audit',
        },
    },
    'loggers': {
        'django': {
            'handlers': ['console', 'file'] if not DEBUG else ['console'],
            'level': 'INFO' if not DEBUG else 'DEBUG',
        },
        'django.security': {
            'handlers': ['console', 'security_file'] if not DEBUG else ['console'],
            'level': 'WARNING',
            'propagate': False,
        },
        'authentication.audit': {
            'handlers': ['console', 'audit_file'] if not DEBUG else ['console'],
            'level': 'INFO',
            'propagate': False,
        },
        # Logger para debugging de rate limiting
        'django_ratelimit': {
            'handlers': ['console', 'security_file'] if not DEBUG else ['console'],
            'level': 'WARNING',
            'propagate': False,
        },
    },
}

# Crear directorio de logs si no existe
import os
LOGS_DIR = BASE_DIR / 'logs'
if not os.path.exists(LOGS_DIR):
    os.makedirs(LOGS_DIR)