use serde::{Deserialize, Serialize};

use crate::{
    commands::{Command, CommandRequest, RequestParserError, empty_command_response},
    request_tokenizer::RequestTokenizer,
    types::{Priority, SongId},
};

pub struct PrioId;

#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
pub struct PrioIdRequest {
    pub prio: Priority,
    pub songids: Vec<SongId>,
}

impl CommandRequest for PrioIdRequest {
    const COMMAND: &'static str = "prioid";
    const MIN_ARGS: u32 = 2;
    // TODO: should this be 2?
    const MAX_ARGS: Option<u32> = None;

    fn into_request_enum(self) -> crate::Request {
        crate::Request::PrioId(self.prio, self.songids)
    }

    fn from_request_enum(request: crate::Request) -> Option<Self> {
        match request {
            crate::Request::PrioId(prio, songids) => Some(PrioIdRequest { prio, songids }),
            _ => None,
        }
    }

    fn serialize(&self) -> String {
        let songids = self
            .songids
            .iter()
            .map(|id| id.to_string())
            .collect::<Vec<String>>()
            .join(",");
        format!("{} {} {}\n", Self::COMMAND, self.prio, songids)
    }

    fn parse(mut parts: RequestTokenizer<'_>) -> Result<Self, RequestParserError> {
        let prio = parts.next().ok_or(Self::missing_arguments_error(0))?;
        let prio = prio
            .parse()
            .map_err(|_| RequestParserError::SubtypeParserError {
                argument_index: 0,
                expected_type: "Priority".to_string(),
                raw_input: prio.to_string(),
            })?;

        // TODO: determine how to count arguments here...
        let songids = parts.next().ok_or(Self::missing_arguments_error(1))?;
        let songids = songids
            .split(',')
            .map(|s| {
                s.parse()
                    .map_err(|_| RequestParserError::SyntaxError(0, s.to_string()))
            })
            .collect::<Result<Vec<SongId>, RequestParserError>>()?;

        Self::throw_if_too_many_arguments(parts)?;

        Ok(PrioIdRequest { prio, songids })
    }
}

empty_command_response!(PrioId);

impl Command for PrioId {
    type Request = PrioIdRequest;
    type Response = PrioIdResponse;
}