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

pub struct Add;

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

    fn parse_request(mut parts: std::str::SplitWhitespace<'_>) -> RequestParserResult<'_> {
        let uri = match parts.next() {
            Some(s) => s,
            None => return Err(RequestParserError::UnexpectedEOF),
        };

        let position = match parts.next() {
            Some(s) => Some(
                s.parse::<SongPosition>()
                    .map_err(|_| RequestParserError::SyntaxError(1, s.to_owned()))?,
            ),
            None => None,
        };

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

        Ok((Request::Add(uri.to_string(), position), ""))
    }

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