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use crate::types::BoxedBytes;
use alloc::string::String;
use alloc::vec::Vec;
use elrond_codec::{DecodeError, EncodeError};

/// Contains a smart contract execution error message.
///
/// Implemented as a simple boxed slice, for performance reasons.
#[derive(Debug, PartialEq, Eq, Clone)]
pub struct SCError(BoxedBytes);

impl SCError {
    #[inline]
    pub fn as_bytes(&self) -> &[u8] {
        self.0.as_slice()
    }
}

impl From<BoxedBytes> for SCError {
    #[inline]
    fn from(boxed_bytes: BoxedBytes) -> Self {
        SCError(boxed_bytes)
    }
}

impl From<&str> for SCError {
    #[inline]
    fn from(s: &str) -> Self {
        SCError(BoxedBytes::from(s.as_bytes()))
    }
}

impl From<String> for SCError {
    #[inline]
    fn from(s: String) -> Self {
        // data copy is avoided:
        // - String -> Vec<u8> via String::into_bytes is just a move
        // - Vec<u8> -> Box<[u8]> -> BoxedBytes is also just a move
        SCError(BoxedBytes::from(s.into_bytes()))
    }
}

impl From<&[u8]> for SCError {
    #[inline]
    fn from(byte_slice: &[u8]) -> Self {
        SCError(BoxedBytes::from(byte_slice))
    }
}

impl From<Vec<u8>> for SCError {
    #[inline]
    fn from(v: Vec<u8>) -> Self {
        SCError(BoxedBytes::from(v))
    }
}

impl From<EncodeError> for SCError {
    #[inline]
    fn from(err: EncodeError) -> Self {
        SCError::from(err.message_bytes())
    }
}

impl From<DecodeError> for SCError {
    #[inline]
    fn from(err: DecodeError) -> Self {
        SCError::from(err.message_bytes())
    }
}

impl From<!> for SCError {
    fn from(_: !) -> Self {
        unreachable!()
    }
}