import os
import importlib.util
from pathlib import Path

try:
    from dotenv import load_dotenv
except ImportError:  # pragma: no cover - optional in stripped test envs
    def load_dotenv():
        return False

load_dotenv()

BASE_DIR = Path(__file__).resolve().parent.parent
LOG_DIR = Path(os.environ.get("LOG_DIR", BASE_DIR / "logs"))
LOG_DIR.mkdir(parents=True, exist_ok=True)

SECRET_KEY = os.environ.get("SECRET_KEY", "django-insecure-dev-only")
DEBUG = os.environ.get("DEBUG", "0") == "1"
ALLOWED_HOSTS = os.environ.get("ALLOWED_HOSTS", "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",
    "dashboard_data",
    "rag",
    "location_data",
    "farm_data.apps.FarmDataConfig",
    "weather",
    "plant",
    "irrigation",
    "fertilization",
    "crop_simulation.apps.CropSimulationConfig",
]

for optional_app in [
    "rest_framework",
    "corsheaders",
    "drf_spectacular",
    "drf_spectacular_sidecar",
]:
    if importlib.util.find_spec(optional_app):
        INSTALLED_APPS.insert(6, optional_app)

MIDDLEWARE = [
    "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",
]

if importlib.util.find_spec("corsheaders"):
    MIDDLEWARE.insert(1, "corsheaders.middleware.CorsMiddleware")

ROOT_URLCONF = "config.urls"
WSGI_APPLICATION = "config.wsgi.application"

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",
            ],
        },
    },
]

DATABASES = {
    "default": {
        "ENGINE": os.environ.get("DB_ENGINE", "django.db.backends.mysql"),
        "NAME": os.environ.get("DB_NAME", "ai"),
        "USER": os.environ.get("DB_USER", "ai"),
        "PASSWORD": os.environ.get("DB_PASSWORD", ""),
        "HOST": os.environ.get("DB_HOST", "127.0.0.1"),
        "PORT": os.environ.get("DB_PORT", "3306"),
    }
}

if DATABASES["default"]["ENGINE"].endswith("mysql"):
    DATABASES["default"]["OPTIONS"] = {"charset": "utf8mb4"}

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"

CACHES = {
    "default": {
        "BACKEND": "django.core.cache.backends.locmem.LocMemCache",
        "LOCATION": "croplogic-auth-otp",
    }
}

REST_FRAMEWORK = {
    "DEFAULT_PERMISSION_CLASSES": [
        "rest_framework.permissions.AllowAny",
    ],
    "DEFAULT_SCHEMA_CLASS": "drf_spectacular.openapi.AutoSchema",
}

SPECTACULAR_SETTINGS = {
    "TITLE": "CropLogic AI API",
    "DESCRIPTION": "API‌های هوش مصنوعی CropLogic — داده خاک، سنسور، هواشناسی و چت RAG",
    "VERSION": "1.0.0",
    "SERVE_INCLUDE_SCHEMA": False,
    "SWAGGER_UI_DIST": "SIDECAR",
    "SWAGGER_UI_FAVICON_HREF": "SIDECAR",
    "REDOC_DIST": "SIDECAR",
    "COMPONENT_SPLIT_REQUEST": True,
    "TAGS": [
        {"name": "Dashboard Data", "description": "تجمیع داده‌های داشبورد مزرعه"},
        {"name": "RAG Chat", "description": "چت هوشمند RAG"},
        {"name": "RAG Recommendations", "description": "توصیه‌های آبیاری و کودهی مبتنی بر RAG"},
        {"name": "Soil Data", "description": "داده‌های خاک (SoilGrids)"},
        {"name": "Farm Data", "description": "داده‌های مزرعه و سنسورها"},
        {"name": "Farm Parameters", "description": "پارامترهای سنسورهای مزرعه"},
        {"name": "Plant", "description": "مدیریت گیاهان و دریافت اطلاعات گیاه"},
        {"name": "Irrigation", "description": "مدیریت روش‌های آبیاری"},
        {"name": "Irrigation Recommendation", "description": "درخواست و پیگیری توصیه آبیاری"},
        {"name": "Fertilization Recommendation", "description": "درخواست و پیگیری توصیه کودهی"},
    ],
}

CORS_ALLOW_ALL_ORIGINS = DEBUG

# Celery
CELERY_BROKER_URL = os.environ.get("CELERY_BROKER_URL", "redis://localhost:6379/0")
CELERY_RESULT_BACKEND = os.environ.get("CELERY_RESULT_BACKEND", "redis://localhost:6379/0")
CELERY_ACCEPT_CONTENT = ["json"]
CELERY_TASK_SERIALIZER = "json"

# Celery Beat — embed دیتای کاربران هر ۶ ساعت
CELERY_BEAT_SCHEDULE = {
    "rag-ingest-periodic": {
        "task": "rag.tasks.rag_ingest_task",
        "schedule": 6 * 60 * 60,  # ۶ ساعت
    },
    "weather-fetch-periodic": {
        "task": "weather.tasks.fetch_weather_all_locations_task",
        "schedule": 6 * 60 * 60,  # ۶ ساعت
    },
}

# Weather API
WEATHER_API_BASE_URL = os.environ.get(
    "WEATHER_API_BASE_URL", "https://api.open-meteo.com/v1/forecast"
)
WEATHER_API_KEY = os.environ.get("WEATHER_API_KEY", "")

LOGGING = {
    "version": 1,
    "disable_existing_loggers": False,
    "formatters": {
        "standard": {
            "format": "%(asctime)s [%(levelname)s] %(name)s: %(message)s",
        },
    },
    "handlers": {
        "console": {
            "class": "logging.StreamHandler",
            "formatter": "standard",
        },
        "file": {
            "class": "logging.handlers.TimedRotatingFileHandler",
            "filename": str(LOG_DIR / "app.log"),
            "when": "midnight",
            "backupCount": 14,
            "encoding": "utf-8",
            "formatter": "standard",
        },
    },
    "loggers": {
        "django": {
            "handlers": ["console", "file"],
            "level": os.environ.get("DJANGO_LOG_LEVEL", "INFO"),
            "propagate": False,
        },
        "rag": {
            "handlers": ["console", "file"],
            "level": os.environ.get("RAG_LOG_LEVEL", "INFO"),
            "propagate": False,
        },
    },
    "root": {
        "handlers": ["console", "file"],
        "level": os.environ.get("ROOT_LOG_LEVEL", "INFO"),
    },
}