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use nu_protocol::{CallInfo, Value};
use serde::{Deserialize, Serialize};
use std::io::Write;

#[derive(Debug, Serialize, Deserialize)]
pub struct JsonRpc<T> {
    jsonrpc: String,
    pub method: String,
    pub params: T,
}

impl<T> JsonRpc<T> {
    pub fn new<U: Into<String>>(method: U, params: T) -> Self {
        JsonRpc {
            jsonrpc: "2.0".into(),
            method: method.into(),
            params,
        }
    }
}

pub fn send_response<T: Serialize>(result: T) {
    let response = JsonRpc::new("response", result);
    let response_raw = serde_json::to_string(&response);

    let mut stdout = std::io::stdout();

    match response_raw {
        Ok(response) => {
            let _ = writeln!(stdout, "{}", response);
        }
        Err(err) => {
            let _ = writeln!(stdout, "{}", err);
        }
    };
}

#[derive(Debug, Serialize, Deserialize)]
#[serde(tag = "method")]
#[allow(non_camel_case_types)]
pub enum NuCommand {
    config,
    begin_filter { params: CallInfo },
    filter { params: Value },
    end_filter,
    sink { params: (CallInfo, Vec<Value>) },
    quit,
}