"""Application configuration. Env-driven, Dev/Prod classes."""
import os
from dotenv import load_dotenv

load_dotenv()


def _bool(val, default=False):
    if val is None:
        return default
    return str(val).strip().lower() in ("1", "true", "yes", "on")


class BaseConfig:
    SECRET_KEY = os.environ.get("SECRET_KEY", "dev-insecure-change-me")

    # --- Database ---
    @staticmethod
    def _database_uri():
        url = os.environ.get("DATABASE_URL")
        if url:
            return url
        user = os.environ.get("DB_USER", "classifieds")
        pwd = os.environ.get("DB_PASSWORD", "")
        host = os.environ.get("DB_HOST", "127.0.0.1")
        port = os.environ.get("DB_PORT", "3306")
        name = os.environ.get("DB_NAME", "classifieds")
        return f"mysql+pymysql://{user}:{pwd}@{host}:{port}/{name}?charset=utf8mb4"

    SQLALCHEMY_DATABASE_URI = _database_uri.__func__()
    SQLALCHEMY_TRACK_MODIFICATIONS = False
    SQLALCHEMY_ENGINE_OPTIONS = {"pool_pre_ping": True, "pool_recycle": 280}

    # --- Redis ---
    REDIS_URL = os.environ.get("REDIS_URL", "redis://127.0.0.1:6379/0")
    RATELIMIT_STORAGE_URI = REDIS_URL

    # --- i18n ---
    DEFAULT_LOCALE = os.environ.get("DEFAULT_LOCALE", "en")
    SUPPORTED_LOCALES = [
        s.strip() for s in os.environ.get("SUPPORTED_LOCALES", "en,vi,es").split(",") if s.strip()
    ]
    BABEL_DEFAULT_LOCALE = DEFAULT_LOCALE
    BABEL_TRANSLATION_DIRECTORIES = "translations"

    # --- Email ---
    MAIL_SERVER = os.environ.get("MAIL_SERVER", "")
    MAIL_PORT = int(os.environ.get("MAIL_PORT", "587"))
    MAIL_USE_TLS = _bool(os.environ.get("MAIL_USE_TLS"), True)
    MAIL_USERNAME = os.environ.get("MAIL_USERNAME", "")
    MAIL_PASSWORD = os.environ.get("MAIL_PASSWORD", "")
    MAIL_FROM = os.environ.get("MAIL_FROM", "no-reply@example.com")
    MAIL_FROM_NAME = os.environ.get("MAIL_FROM_NAME", "Classifieds")

    # --- Turnstile ---
    TURNSTILE_SITE_KEY = os.environ.get("TURNSTILE_SITE_KEY", "")
    TURNSTILE_SECRET_KEY = os.environ.get("TURNSTILE_SECRET_KEY", "")

    # --- Token lifetimes ---
    TOKEN_VERIFY_MAX_AGE = int(os.environ.get("TOKEN_VERIFY_MAX_AGE", "86400"))
    TOKEN_RESET_MAX_AGE = int(os.environ.get("TOKEN_RESET_MAX_AGE", "3600"))

    # --- Media (uploaded images) ---
    MEDIA_ROOT = os.environ.get("MEDIA_ROOT") or None  # default: instance/media

    # --- Stripe ---
    STRIPE_SECRET_KEY = os.environ.get("STRIPE_SECRET_KEY", "")
    STRIPE_PUBLISHABLE_KEY = os.environ.get("STRIPE_PUBLISHABLE_KEY", "")
    STRIPE_WEBHOOK_SECRET = os.environ.get("STRIPE_WEBHOOK_SECRET", "")

    # --- Session cookie hardening ---
    SESSION_COOKIE_HTTPONLY = True
    SESSION_COOKIE_SAMESITE = "Lax"
    PREFERRED_URL_SCHEME = "https"


class DevConfig(BaseConfig):
    DEBUG = True
    SESSION_COOKIE_SECURE = False


class ProdConfig(BaseConfig):
    DEBUG = False
    SESSION_COOKIE_SECURE = True
    SERVER_NAME = os.environ.get("SERVER_NAME") or None


def get_config():
    name = os.environ.get("FLASK_CONFIG", "dev").lower()
    return ProdConfig if name == "prod" else DevConfig