use serde::{Deserialize, Serialize};

use crate::{
    Request,
    request_tokenizer::RequestTokenizer,
    commands::{
        Command, RequestParserError, RequestParserResult, ResponseAttributes, ResponseParserError,
    },
    common::{AbsouluteRelativeSongPosition, OneOrRange},
};

pub struct Move;

#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
pub struct MoveRequest {
    pub from_or_range: OneOrRange,
    pub to: AbsouluteRelativeSongPosition,
}

impl Command for Move {
    type Request = MoveRequest;
    type Response = ();
    const COMMAND: &'static str = "move";

    fn serialize_request(&self, request: Self::Request) -> String {
        format!("{} {} {}", Self::COMMAND, request.from_or_range, request.to)
    }

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

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

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

        Ok((Request::Move(from_or_range, to), ""))
    }

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