use serde::{Deserialize, Serialize};

use crate::{
    commands::{Command, CommandRequest, RequestParserError, empty_command_response},
    request_tokenizer::RequestTokenizer,
    types::{SongPosition, Uri},
};

pub struct Add;

#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
pub struct AddRequest {
    uri: Uri,
    position: Option<SongPosition>,
}

impl CommandRequest for AddRequest {
    const COMMAND: &'static str = "add";
    const MIN_ARGS: u32 = 1;
    const MAX_ARGS: Option<u32> = Some(2);

    fn into_request_enum(self) -> crate::Request {
        crate::Request::Add(self.uri, self.position)
    }

    fn from_request_enum(request: crate::Request) -> Option<Self> {
        match request {
            crate::Request::Add(uri, position) => Some(AddRequest { uri, position }),
            _ => None,
        }
    }

    fn serialize(&self) -> String {
        match self.position {
            Some(position) => format!("{} {} {}\n", Self::COMMAND, self.uri, position),
            None => format!("{} {}\n", Self::COMMAND, self.uri),
        }
    }

    fn parse(mut parts: RequestTokenizer<'_>) -> Result<Self, RequestParserError> {
        let uri = match parts.next() {
            Some(s) => s,
            None => return Err(Self::missing_arguments_error(0)),
        };

        let position = match parts.next() {
            Some(s) => Some(s.parse::<SongPosition>().map_err(|_| {
                RequestParserError::SubtypeParserError {
                    argument_index: 1,
                    expected_type: "SongPosition".to_string(),
                    raw_input: s.to_owned(),
                }
            })?),
            None => None,
        };

        Self::throw_if_too_many_arguments(parts)?;

        Ok(AddRequest {
            uri: uri.to_string(),
            position,
        })
    }
}

empty_command_response!(Add);

impl Command for Add {
    type Request = AddRequest;
    type Response = AddResponse;
}