use serde::{Deserialize, Serialize};

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

pub struct Prio;

#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
pub struct PrioRequest {
    pub prio: Priority,
    pub window: WindowRange,
}

impl Command for Prio {
    type Request = PrioRequest;
    type Response = ();
    const COMMAND: &'static str = "prio";

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

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

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

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

        Ok((Request::Prio(prio, window), ""))
    }

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