use crate::{
    commands::{
        Command, RequestParserError, RequestParserResult, ResponseAttributes, ResponseParserError,
    },
    Request,
};

pub struct SwapId;

impl Command for SwapId {
    type Response = ();
    const COMMAND: &'static str = "swapid";

    fn parse_request(mut parts: std::str::SplitWhitespace<'_>) -> RequestParserResult<'_> {
        let songid1 = parts.next().ok_or(RequestParserError::UnexpectedEOF)?;
        let songid1 = songid1
            .parse()
            .map_err(|_| RequestParserError::SyntaxError(0, songid1.to_string()))?;

        let songid2 = parts.next().ok_or(RequestParserError::UnexpectedEOF)?;
        let songid2 = songid2
            .parse()
            .map_err(|_| RequestParserError::SyntaxError(0, songid2.to_string()))?;

        debug_assert!(parts.next().is_none());

        Ok((Request::SwapId(songid1, songid2), ""))
    }

    fn parse_response(
        parts: ResponseAttributes<'_>,
    ) -> Result<Self::Response, ResponseParserError> {
        debug_assert!(parts.is_empty());
        Ok(())
    }
}