use std::{ffi::OsString, path::PathBuf};

use ed25519_dalek::Keypair;
use sparse_05_common::CONFIG_SEPARATOR;
use tokio::{fs, io::AsyncWriteExt};

use crate::configs::ClientConfig;

#[cfg(debug_assertions)]
pub const SPARSE_SERVER_BINARY: &'static [u8] =
    include_bytes!("../../../../target/debug/sparse-05-server");
#[cfg(not(debug_assertions))]
pub const SPARSE_SERVER_BINARY: &'static [u8] =
    include_bytes!("../../../../target/release/sparse-05-server");

pub async fn generate(mut name: PathBuf, port: u16) -> anyhow::Result<()> {
    let mut csprng = rand::thread_rng();
    let keypair = Keypair::generate(&mut csprng);
    let (enc_privkey, enc_pubkey) = ecies_ed25519::generate_keypair(&mut csprng);

    let mut file = fs::OpenOptions::new()
        .write(true)
        .create(true)
        .mode(0o755)
        .open(&name)
        .await?;

    file.write_all(SPARSE_SERVER_BINARY).await?;
    file.write_all(CONFIG_SEPARATOR).await?;
    file.write_all(&port.to_be_bytes()[..]).await?;
    file.write_all(keypair.public.as_bytes()).await?;
    file.write_all(enc_pubkey.as_bytes()).await?;

    let config = ClientConfig {
        keypair,
        enc_privkey,
        enc_pubkey,
        port,
    };

    let mut file_part = name.file_name().unwrap().to_owned();
    file_part.push(OsString::from(".scon"));
    name.pop();
    name.push(file_part);
    let mut file = fs::OpenOptions::new()
        .write(true)
        .create(true)
        .open(&name)
        .await?;

    let config = rmp_serde::to_vec(&config)?;
    file.write_all(&config).await?;

    Ok(())
}