use lightning::util::persist::{KVSTORE_NAMESPACE_KEY_ALPHABET, KVSTORE_NAMESPACE_KEY_MAX_LEN};
use lightning::util::string::PrintableString;

pub(crate) fn is_valid_kvstore_str(key: &str) -> bool {
	key.len() <= KVSTORE_NAMESPACE_KEY_MAX_LEN
		&& key.chars().all(|c| KVSTORE_NAMESPACE_KEY_ALPHABET.contains(c))
}

pub(crate) fn check_namespace_key_validity(
	primary_namespace: &str, secondary_namespace: &str, key: Option<&str>, operation: &str,
) -> Result<(), std::io::Error> {
	if let Some(key) = key {
		if key.is_empty() {
			debug_assert!(
				false,
				"Failed to {} {}/{}/{}: key may not be empty.",
				operation,
				PrintableString(primary_namespace),
				PrintableString(secondary_namespace),
				PrintableString(key)
			);
			let msg = format!(
				"Failed to {} {}/{}/{}: key may not be empty.",
				operation,
				PrintableString(primary_namespace),
				PrintableString(secondary_namespace),
				PrintableString(key)
			);
			return Err(std::io::Error::new(std::io::ErrorKind::Other, msg));
		}

		if primary_namespace.is_empty() && !secondary_namespace.is_empty() {
			debug_assert!(false,
				"Failed to {} {}/{}/{}: primary namespace may not be empty if a non-empty secondary namespace is given.",
				operation,
				PrintableString(primary_namespace), PrintableString(secondary_namespace), PrintableString(key));
			let msg = format!(
				"Failed to {} {}/{}/{}: primary namespace may not be empty if a non-empty secondary namespace is given.", operation,
				PrintableString(primary_namespace), PrintableString(secondary_namespace), PrintableString(key));
			return Err(std::io::Error::new(std::io::ErrorKind::Other, msg));
		}

		if !is_valid_kvstore_str(primary_namespace)
			|| !is_valid_kvstore_str(secondary_namespace)
			|| !is_valid_kvstore_str(key)
		{
			debug_assert!(false, "Failed to {} {}/{}/{}: primary namespace, secondary namespace, and key must be valid.",
				operation,
				PrintableString(primary_namespace), PrintableString(secondary_namespace), PrintableString(key));
			let msg = format!("Failed to {} {}/{}/{}: primary namespace, secondary namespace, and key must be valid.",
				operation,
				PrintableString(primary_namespace), PrintableString(secondary_namespace), PrintableString(key));
			return Err(std::io::Error::new(std::io::ErrorKind::Other, msg));
		}
	} else {
		if primary_namespace.is_empty() && !secondary_namespace.is_empty() {
			debug_assert!(false,
				"Failed to {} {}/{}: primary namespace may not be empty if a non-empty secondary namespace is given.",
				operation, PrintableString(primary_namespace), PrintableString(secondary_namespace));
			let msg = format!(
				"Failed to {} {}/{}: primary namespace may not be empty if a non-empty secondary namespace is given.",
				operation, PrintableString(primary_namespace), PrintableString(secondary_namespace));
			return Err(std::io::Error::new(std::io::ErrorKind::Other, msg));
		}
		if !is_valid_kvstore_str(primary_namespace) || !is_valid_kvstore_str(secondary_namespace) {
			debug_assert!(
				false,
				"Failed to {} {}/{}: primary namespace and secondary namespace must be valid.",
				operation,
				PrintableString(primary_namespace),
				PrintableString(secondary_namespace)
			);
			let msg = format!(
				"Failed to {} {}/{}: primary namespace and secondary namespace must be valid.",
				operation,
				PrintableString(primary_namespace),
				PrintableString(secondary_namespace)
			);
			return Err(std::io::Error::new(std::io::ErrorKind::Other, msg));
		}
	}

	Ok(())
}