import os
from pathlib import Path
from datetime import timedelta
from dotenv import load_dotenv

# Load .env file from the project root (not backend dir)
BASE_DIR = Path(__file__).resolve().parent.parent.parent
PROJECT_DIR = BASE_DIR.parent
load_dotenv(PROJECT_DIR / ".env")

SECRET_KEY = os.getenv("SECRET_KEY", "django-insecure-default-key-generate-yours")

# Installed Apps
INSTALLED_APPS = [
    "django.contrib.admin",
    "django.contrib.auth",
    "django.contrib.contenttypes",
    "django.contrib.sessions",
    "django.contrib.messages",
    "django.contrib.staticfiles",
    
    # Third party
    "rest_framework",
    "corsheaders",
    "rest_framework_simplejwt",
    "django_extensions",
    "drf_spectacular",
    "django_filters",
    
    # Local Apps
    "tenants",
    "accounts",
    "dashboard",
    "projects",
    "analytics",
]

MIDDLEWARE = [
    "corsheaders.middleware.CorsMiddleware",
    "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",
    # Custom Middleware
    "tenants.middleware.TenantMiddleware",
]

ROOT_URLCONF = "core.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 = "core.wsgi.application"
ASGI_APPLICATION = "core.asgi.application"

# Database defaults
DATABASES = {
    "default": {
        "ENGINE": "django.db.backends.sqlite3",
        "NAME": BASE_DIR / "db.sqlite3",
    }
}

# Use Accounts app custom User model
AUTH_USER_MODEL = "accounts.User"

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 = "en-us"
TIME_ZONE = "UTC"
USE_I18N = True
USE_TZ = True

STATIC_URL = "static/"
STATIC_ROOT = BASE_DIR / "staticfiles"

DEFAULT_AUTO_FIELD = "django.db.models.BigAutoField"

# REST Framework settings
REST_FRAMEWORK = {
    "DEFAULT_AUTHENTICATION_CLASSES": (
        "rest_framework_simplejwt.authentication.JWTAuthentication",
    ),
    "DEFAULT_SCHEMA_CLASS": "drf_spectacular.openapi.AutoSchema",
    "DEFAULT_PAGINATION_CLASS": "rest_framework.pagination.PageNumberPagination",
    "PAGE_SIZE": 10,
    "DEFAULT_FILTER_BACKENDS": ["django_filters.rest_framework.DjangoFilterBackend"],
    "DEFAULT_THROTTLE_CLASSES": [
        "rest_framework.throttling.AnonRateThrottle",
        "rest_framework.throttling.UserRateThrottle"
    ],
    "DEFAULT_THROTTLE_RATES": {
        "anon": "100/day",
        "user": "1000/day"
    }
}

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

# DRF Spectacular
SPECTACULAR_SETTINGS = {
    "TITLE": "MTCBD API",
    "DESCRIPTION": "Multi-Tenant Cloud Based Dashboard APIs",
    "VERSION": "1.0.0",
    "SERVE_INCLUDE_SCHEMA": False,
}

# Redis Caching
CACHES = {
    "default": {
        "BACKEND": "django_redis.cache.RedisCache",
        "LOCATION": os.getenv("REDIS_URL", "redis://127.0.0.1:6379/1"),
        "OPTIONS": {
            "CLIENT_CLASS": "django_redis.client.DefaultClient",
        }
    }
}

# Celery Configuration
CELERY_BROKER_URL = os.getenv("REDIS_URL", "redis://127.0.0.1:6379/2")
CELERY_RESULT_BACKEND = os.getenv("REDIS_URL", "redis://127.0.0.1:6379/2")
CELERY_ACCEPT_CONTENT = ['json']
CELERY_TASK_SERIALIZER = 'json'