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use crate::{abi::TypeAbi, types::BoxedBytes};
use alloc::string::String;
use elrond_codec::{EncodeErrorHandler, TopEncodeMulti, TopEncodeMultiOutput};

/// Standard way of signalling that an operation was interrupted early, before running out of gas.
/// An endpoint that performs a longer operation can check from time to time if it is running low
/// on gas and can decide to save its state and exit, so that it can continue the same operation later.
#[derive(PartialEq, Debug, Clone, Copy)]
pub enum OperationCompletionStatus {
    Completed,
    InterruptedBeforeOutOfGas,
}

impl OperationCompletionStatus {
    pub fn output_bytes(&self) -> &'static [u8] {
        match self {
            OperationCompletionStatus::Completed => b"completed",
            OperationCompletionStatus::InterruptedBeforeOutOfGas => b"interrupted",
        }
    }

    pub fn is_completed(&self) -> bool {
        matches!(self, OperationCompletionStatus::Completed)
    }

    pub fn is_interrupted(&self) -> bool {
        matches!(self, OperationCompletionStatus::InterruptedBeforeOutOfGas)
    }
}

impl TopEncodeMulti for OperationCompletionStatus {
    type DecodeAs = BoxedBytes;

    fn multi_encode_or_handle_err<O, H>(&self, output: &mut O, h: H) -> Result<(), H::HandledErr>
    where
        O: TopEncodeMultiOutput,
        H: EncodeErrorHandler,
    {
        output.push_single_value(&self.output_bytes(), h)
    }
}

impl TypeAbi for OperationCompletionStatus {
    fn type_name() -> String {
        String::from("OperationCompletionStatus")
    }
}

////////////////////////////////////////////////////////////////////////////////

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn test_operation_completion_status_is() {
        assert!(OperationCompletionStatus::Completed.is_completed());
        assert!(!OperationCompletionStatus::Completed.is_interrupted());
        assert!(!OperationCompletionStatus::InterruptedBeforeOutOfGas.is_completed());
        assert!(OperationCompletionStatus::InterruptedBeforeOutOfGas.is_interrupted());
    }
}