use serde::{Deserialize, Serialize};

use crate::{
    commands::{Command, CommandRequest, RequestParserError, empty_command_response},
    request_tokenizer::RequestTokenizer,
    types::{AbsouluteRelativeSongPosition, OneOrRange},
};

pub struct Move;

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

impl CommandRequest for MoveRequest {
    const COMMAND: &'static str = "move";

    fn into_request_enum(self) -> crate::Request {
        crate::Request::Move(self.from_or_range, self.to)
    }

    fn from_request_enum(request: crate::Request) -> Option<Self> {
        match request {
            crate::Request::Move(from_or_range, to) => Some(MoveRequest { from_or_range, to }),
            _ => None,
        }
    }

    fn serialize(&self) -> String {
        format!("{} {} {}\n", Self::COMMAND, self.from_or_range, self.to)
    }

    fn parse(mut parts: RequestTokenizer<'_>) -> Result<Self, RequestParserError> {
        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(MoveRequest { from_or_range, to })
    }
}

empty_command_response!(Move);

impl Command for Move {
    type Request = MoveRequest;
    type Response = MoveResponse;
}