import os
from datetime import timedelta
from pathlib import Path

from dotenv import load_dotenv

load_dotenv()

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

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(",")

AUTH_USER_MODEL = "account.User"

AUTHENTICATION_BACKENDS = [
    "account.backends.MultiFieldBackend",
]

INSTALLED_APPS = [
    "django.contrib.admin",
    "django.contrib.auth",
    "django.contrib.contenttypes",
    "django.contrib.sessions",
    "django.contrib.messages",
    "django.contrib.staticfiles",
    "auth.apps.AuthConfig",
    "account.apps.AccountConfig",
    "sensor_hub.apps.SensorHubConfig",
    "dashboard",
    "crop_zoning",
    "plant_simulator",
    "pest_detection",
    "irrigation_recommendation",
    "fertilization_recommendation",
    "farm_ai_assistant",
    "external_api_adapter.apps.ExternalApiAdapterConfig",
    "rest_framework",
    "drf_spectacular",
    "drf_spectacular_sidecar",
    "corsheaders",
]

MIDDLEWARE = [
    "django.middleware.security.SecurityMiddleware",
    "corsheaders.middleware.CorsMiddleware",
    "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",
]

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", "croplogic"),
        "USER": os.environ.get("DB_USER", "croplogic"),
        "PASSWORD": os.environ.get("DB_PASSWORD", ""),
        "HOST": os.environ.get("DB_HOST", "127.0.0.1"),
        "PORT": os.environ.get("DB_PORT", "3306"),
        "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.IsAuthenticated",
    ],
    "DEFAULT_AUTHENTICATION_CLASSES": [
        "rest_framework_simplejwt.authentication.JWTAuthentication",
    ],
    "DEFAULT_SCHEMA_CLASS": "drf_spectacular.openapi.AutoSchema",
}

SPECTACULAR_SETTINGS = {
    "TITLE": "CropLogic API",
    "DESCRIPTION": "Swagger/OpenAPI documentation for all CropLogic API endpoints.",
    "VERSION": "1.0.0",
    "SERVE_INCLUDE_SCHEMA": False,
    "SWAGGER_UI_DIST": "SIDECAR",
    "SWAGGER_UI_FAVICON_HREF": "SIDECAR",
    "REDOC_DIST": "SIDECAR",
    "SCHEMA_PATH_PREFIX": r"/api/",
    "SERVE_PERMISSIONS": ["rest_framework.permissions.AllowAny"],
}


SMS_IR_API_KEY = os.environ.get("SMS_IR_API_KEY", "")
SMS_IR_LINE_NUMBER = int(os.environ.get("SMS_IR_LINE_NUMBER", "300000000000"))

CORS_ALLOW_ALL_ORIGINS = DEBUG

USE_EXTERNAL_API_MOCK = os.getenv("USE_EXTERNAL_API_MOCK", "false").lower() == "true"
EXTERNAL_API_TIMEOUT = int(os.getenv("EXTERNAL_API_TIMEOUT", "30"))

EXTERNAL_SERVICES = {
    "ai": {
        "base_url": os.getenv("AI_SERVICE_BASE_URL", ""),
        "api_key": os.getenv("AI_SERVICE_API_KEY", ""),
    },
    "sensor_hub": {
        "base_url": os.getenv("SENSOR_HUB_SERVICE_BASE_URL", ""),
        "api_key": os.getenv("SENSOR_HUB_SERVICE_API_KEY", ""),
    },
}


SIMPLE_JWT = {
    "ACCESS_TOKEN_LIFETIME": timedelta(days=7),
    "REFRESH_TOKEN_LIFETIME": timedelta(days=7),
    "ROTATE_REFRESH_TOKENS": False,
    "BLACKLIST_AFTER_ROTATION": False,
}

CROP_ZONE_CHUNK_AREA_SQM = float(os.getenv("CROP_ZONE_CHUNK_AREA_SQM", "10000"))

CELERY_BROKER_URL = os.getenv("CELERY_BROKER_URL", "redis://127.0.0.1:6379/0")
CELERY_RESULT_BACKEND = os.getenv("CELERY_RESULT_BACKEND", CELERY_BROKER_URL)
CELERY_TASK_DEFAULT_QUEUE = os.getenv("CELERY_TASK_DEFAULT_QUEUE", "default")
CELERY_TASK_ACKS_LATE = True
CELERY_WORKER_PREFETCH_MULTIPLIER = int(os.getenv("CELERY_WORKER_PREFETCH_MULTIPLIER", "1"))
CELERY_TASK_TIME_LIMIT = int(os.getenv("CELERY_TASK_TIME_LIMIT", "120"))
CELERY_TASK_SOFT_TIME_LIMIT = int(os.getenv("CELERY_TASK_SOFT_TIME_LIMIT", "90"))