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// Copyright 2015-2020 Parity Technologies
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.

use crate::no_std_prelude::Cow;
#[cfg(not(feature = "std"))]
use crate::no_std_prelude::*;
#[cfg(feature = "serde")]
use core::num;
#[cfg(feature = "std")]
use thiserror::Error;

/// Ethabi result type
pub type Result<T> = core::result::Result<T, Error>;

/// Ethabi errors
#[cfg_attr(feature = "std", derive(Error))]
#[derive(Debug)]
pub enum Error {
	/// Invalid entity such as a bad function name.
	#[cfg_attr(feature = "std", error("Invalid name: {0}"))]
	InvalidName(String),
	/// Invalid data.
	#[cfg_attr(feature = "std", error("Invalid data"))]
	InvalidData,
	/// Serialization error.
	#[cfg(feature = "full-serde")]
	#[error("Serialization error: {0}")]
	SerdeJson(#[from] serde_json::Error),
	/// Integer parsing error.
	#[cfg(feature = "serde")]
	#[cfg_attr(feature = "std", error("Integer parsing error: {0}"))]
	ParseInt(#[cfg_attr(feature = "std", from)] num::ParseIntError),
	/// Hex string parsing error.
	#[cfg(feature = "serde")]
	#[cfg_attr(feature = "std", error("Hex parsing error: {0}"))]
	Hex(#[cfg_attr(feature = "std", from)] hex::FromHexError),
	/// Other errors.
	#[cfg_attr(feature = "std", error("{0}"))]
	Other(Cow<'static, str>),
}

#[cfg(feature = "serde")]
impl From<uint::FromDecStrErr> for Error {
	fn from(err: uint::FromDecStrErr) -> Self {
		use uint::FromDecStrErr::*;
		match err {
			InvalidCharacter => Self::Other(Cow::Borrowed("Uint parse error: InvalidCharacter")),
			InvalidLength => Self::Other(Cow::Borrowed("Uint parse error: InvalidLength")),
		}
	}
}