import os
import sys
from pathlib import Path
from datetime import timedelta
from urllib.parse import urlparse

from dotenv import load_dotenv

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

load_dotenv(BASE_DIR / ".env")

SECRET_KEY = os.getenv("DJANGO_SECRET_KEY", "unsafe-dev-key")
DEBUG = os.getenv("DJANGO_DEBUG", "0") == "1"
ALLOWED_HOSTS = [h.strip() for h in os.getenv("DJANGO_ALLOWED_HOSTS", "").split(",") if h.strip()]

INSTALLED_APPS = [
    "django.contrib.admin",
    "django.contrib.auth",
    "django.contrib.contenttypes",
    "django.contrib.sessions",
    "django.contrib.messages",
    "django.contrib.staticfiles",
    "rest_framework",
    "corsheaders",
    "apps.accounts",
    "apps.salons",
    "apps.bookings",
    "apps.payments",
    "apps.notifications",
]

MIDDLEWARE = [
    "django.middleware.security.SecurityMiddleware",
    "django.contrib.sessions.middleware.SessionMiddleware",
    "django.middleware.locale.LocaleMiddleware",
    "corsheaders.middleware.CorsMiddleware",
    "django.middleware.common.CommonMiddleware",
    "django.middleware.csrf.CsrfViewMiddleware",
    "django.contrib.auth.middleware.AuthenticationMiddleware",
    "apps.accounts.middleware.UserLocaleMiddleware",
    "django.contrib.messages.middleware.MessageMiddleware",
    "django.middleware.clickjacking.XFrameOptionsMiddleware",
]

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


def parse_database_url(database_url: str):
    parsed = urlparse(database_url)
    if parsed.scheme not in {"postgres", "postgresql"}:
        return None
    return {
        "ENGINE": "django.db.backends.postgresql",
        "NAME": parsed.path.lstrip("/"),
        "USER": parsed.username,
        "PASSWORD": parsed.password,
        "HOST": parsed.hostname,
        "PORT": parsed.port or "5432",
    }


running_tests = "PYTEST_CURRENT_TEST" in os.environ or any("pytest" in arg for arg in sys.argv)
test_database_url = os.getenv("TEST_DATABASE_URL")
database_url = os.getenv("DATABASE_URL")

if running_tests:
    parsed_db = parse_database_url(test_database_url) if test_database_url else None
else:
    parsed_db = parse_database_url(database_url) if database_url else None

DATABASES = {
    "default": parsed_db
    or {
        "ENGINE": "django.db.backends.sqlite3",
        "NAME": BASE_DIR / "db.sqlite3",
    }
}

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 = "ar-sa"
LANGUAGES = [
    ("ar-sa", "Arabic (Saudi Arabia)"),
    ("en", "English"),
]
LOCALE_PATHS = [BASE_DIR / "locale"]
TIME_ZONE = "Asia/Riyadh"
USE_I18N = True
USE_TZ = True

STATIC_URL = "static/"
DEFAULT_AUTO_FIELD = "django.db.models.BigAutoField"

AUTH_USER_MODEL = "accounts.User"

REST_FRAMEWORK = {
    "DEFAULT_AUTHENTICATION_CLASSES": (
        "rest_framework_simplejwt.authentication.JWTAuthentication",
    ),
    "DEFAULT_PERMISSION_CLASSES": (
        "rest_framework.permissions.IsAuthenticatedOrReadOnly",
    ),
}

SIMPLE_JWT = {
    "ACCESS_TOKEN_LIFETIME": timedelta(minutes=30),
    "REFRESH_TOKEN_LIFETIME": timedelta(days=7),
    "AUTH_HEADER_TYPES": ("Bearer",),
}

CORS_ALLOWED_ORIGINS = [
    origin.strip()
    for origin in os.getenv("CORS_ALLOWED_ORIGINS", "").split(",")
    if origin.strip()
]

OTP_PROVIDER = os.getenv("OTP_PROVIDER", "console")
if running_tests:
    OTP_PROVIDER = os.getenv("TEST_OTP_PROVIDER", "console")
OTP_EXPIRY_MINUTES = int(os.getenv("OTP_EXPIRY_MINUTES", "5"))
OTP_MAX_PER_WINDOW = int(os.getenv("OTP_MAX_PER_WINDOW", "5"))
OTP_WINDOW_MINUTES = int(os.getenv("OTP_WINDOW_MINUTES", "15"))
OTP_RESEND_COOLDOWN_SECONDS = int(os.getenv("OTP_RESEND_COOLDOWN_SECONDS", "60"))
DEFAULT_CURRENCY = os.getenv("DEFAULT_CURRENCY", "SAR")
NOTIFICATION_PROVIDER = os.getenv("NOTIFICATION_PROVIDER", OTP_PROVIDER)
NOTIFICATION_DEFAULT_CHANNEL = os.getenv("NOTIFICATION_DEFAULT_CHANNEL", "sms")