use std::sync::{Arc, Mutex};

use crate::interaction::Interaction;

pub struct Buffer {
    int_buffer: Arc<Mutex<Vec<String>>>,
    out_buffer: Arc<Mutex<Vec<String>>>,
}

impl Buffer {
    pub fn new(int_buffer: Arc<Mutex<Vec<String>>>, out_buffer: Arc<Mutex<Vec<String>>>) -> Self {
        Self {
            int_buffer,
            out_buffer,
        }
    }
}

impl Interaction for Buffer {
    fn input(&self) -> Result<String, String> {
        let mut int_buffer = self.int_buffer.lock().unwrap();
        if let Some(input_string) = int_buffer.pop() {
            Ok(input_string)
        } else {
            Err(String::from("internal_buffer is empty"))
        }
    }

    fn output(&self, output: String) {
        let mut out_buffer = self.out_buffer.lock().unwrap();
        out_buffer.push(output)
    }
}