use serde::{Deserialize, Serialize};

use crate::{
    commands::{Command, RequestParserError, ResponseParserError},
    common::types::{PlaylistVersion, WindowRange},
    request_tokenizer::RequestTokenizer,
    response_tokenizer::ResponseAttributes,
};

pub struct PlChangesPosId;

#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
pub struct PlChangesPosIdRequest {
    pub version: PlaylistVersion,
    pub window: Option<WindowRange>,
}

impl Command for PlChangesPosId {
    type Request = PlChangesPosIdRequest;
    type Response = ();
    const COMMAND: &'static str = "plchangesposid";

    fn serialize_request(&self, request: Self::Request) -> String {
        match request.window {
            Some(window) => format!("{} {} {}", Self::COMMAND, request.version, window),
            None => format!("{} {}", Self::COMMAND, request.version),
        }
    }

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

        let window = parts
            .next()
            .map(|w| {
                w.parse()
                    .map_err(|_| RequestParserError::SyntaxError(0, w.to_string()))
            })
            .transpose()?;

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

        Ok(PlChangesPosIdRequest { version, window })
    }

    fn parse_response(
        parts: ResponseAttributes<'_>,
    ) -> Result<Self::Response, ResponseParserError<'_>> {
        unimplemented!()
    }
}