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// Copyright 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 std::{error, fmt, result};

/// Transaction Pool Error
#[derive(Debug)]
pub enum Error<Hash: fmt::Debug + fmt::LowerHex> {
	/// Transaction is already imported
	AlreadyImported(Hash),
	/// Transaction is too cheap to enter the queue
	TooCheapToEnter(Hash, String),
	/// Transaction is too cheap to replace existing transaction that occupies the same slot.
	TooCheapToReplace(Hash, Hash),
}

/// Transaction Pool Result
pub type Result<T, H> = result::Result<T, Error<H>>;

impl<H: fmt::Debug + fmt::LowerHex> fmt::Display for Error<H> {
	fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
		match self {
			Error::AlreadyImported(h) => write!(f, "[{:?}] already imported", h),
			Error::TooCheapToEnter(hash, min_score) => {
				write!(f, "[{:x}] too cheap to enter the pool. Min score: {}", hash, min_score)
			}
			Error::TooCheapToReplace(old_hash, hash) => write!(f, "[{:x}] too cheap to replace: {:x}", hash, old_hash),
		}
	}
}

impl<H: fmt::Debug + fmt::LowerHex> error::Error for Error<H> {}

#[cfg(test)]
impl<H: fmt::Debug + fmt::LowerHex> PartialEq for Error<H>
where
	H: PartialEq,
{
	fn eq(&self, other: &Self) -> bool {
		use self::Error::*;

		match (self, other) {
			(&AlreadyImported(ref h1), &AlreadyImported(ref h2)) => h1 == h2,
			(&TooCheapToEnter(ref h1, ref s1), &TooCheapToEnter(ref h2, ref s2)) => h1 == h2 && s1 == s2,
			(&TooCheapToReplace(ref old1, ref new1), &TooCheapToReplace(ref old2, ref new2)) => {
				old1 == old2 && new1 == new2
			}
			_ => false,
		}
	}
}