use std::io::Write;
use std::net::TcpStream;
use std::sync::{Arc, RwLock};

use anyhow::Result;

use bank::bank::Bank;

use crate::commands::Command;
use crate::protocol;

pub struct Deposit;

impl Command for Deposit {
    fn execute(&self, bank: Arc<RwLock<Bank>>, data: &[u8], mut stream: &TcpStream) -> Result<usize> {
        let value_bytes: [u8; 8] = <[u8; 8]>::try_from(data[..8].to_vec().as_slice())?;
        debug!("value bytes {:?}", value_bytes);

        let nr_bytes = &data[8..].to_vec();
        debug!("nr bytes {:?}", nr_bytes);

        let amount = f64::from_be_bytes(value_bytes);
        let nr = String::from_utf8_lossy(nr_bytes).to_string();
        info!("depositing {} into {}...", amount, nr);

        let bank = bank.read().unwrap();

        let written = match bank.accounts.get(&nr) {
            Some(acc) => {
                let mut acc = acc.write().unwrap();
                stream.write(&protocol::deposit(acc.deposit(amount)))?
            }
            None => stream.write(&protocol::error(2))?
        };

        Ok(written)
    }
}