#[cfg(windows)]
use contractless::common::cli_prompts::prompt_hidden_nonempty;
#[cfg(windows)]
use contractless::startup::unlock_pipe::pipe_name;
#[cfg(windows)]
use contractless::startup::unlock_structs::{UnlockPipeRequest, UnlockPipeResponse};
#[cfg(windows)]
use contractless::{env, from_slice, to_string};
#[cfg(windows)]
use tokio::io::{AsyncReadExt, AsyncWriteExt};
#[cfg(windows)]
use tokio::net::windows::named_pipe::ClientOptions;

#[cfg(windows)]
#[tokio::main]
async fn main() {
    // Keep the Windows-only service helper small: run the pipe request and print any failure.
    if let Err(err) = run().await {
        eprintln!("{err}");
        std::process::exit(1);
    }
}

#[cfg(windows)]
async fn run() -> Result<(), Box<dyn std::error::Error>> {
    // The helper supports simple service checks as well as submitting the wallet key.
    let command = env::args().nth(1).unwrap_or_else(|| "submit".to_string());
    let request = match command.as_str() {
        "ping" => UnlockPipeRequest::Ping,
        "status" => UnlockPipeRequest::Status,
        "submit" => {
            // Wallet keys are hidden at the terminal and rejected if the user enters nothing.
            let wallet_key = prompt_hidden_nonempty(
                "Please enter your wallet key: ",
                "Wallet key cannot be empty. Please try again.",
            )
            .await;
            UnlockPipeRequest::SubmitKey { wallet_key }
        }
        other => {
            return Err(format!(
                "Unsupported command '{other}'. Use 'submit', 'ping', or 'status'."
            )
            .into())
        }
    };

    let pipe = pipe_name();
    let payload = to_string(&request)?;

    // The service unlock pipe uses a length-prefixed JSON payload.
    let mut client = ClientOptions::new().open(&pipe)?;
    client.write_u32_le(payload.len() as u32).await?;
    client.write_all(payload.as_bytes()).await?;

    // Read the length-prefixed service reply and decode the response enum.
    let response_len = client.read_u32_le().await? as usize;
    let mut response_bytes = vec![0u8; response_len];
    client.read_exact(&mut response_bytes).await?;

    let response: UnlockPipeResponse = from_slice(&response_bytes)?;

    match response {
        UnlockPipeResponse::Pong => {
            println!("Pong");
        }
        UnlockPipeResponse::Status { state } => {
            println!("Service state: {state:?}");
        }
        UnlockPipeResponse::KeyAccepted => {
            println!("Wallet key accepted.");
        }
        UnlockPipeResponse::Error { message } => {
            return Err(message.into());
        }
    }

    Ok(())
}

#[cfg(not(windows))]
fn main() {
    // Non-Windows builds keep the binary present but clearly report that the pipe does not exist.
    eprintln!("contractless-submit-key is only supported on Windows.");
    std::process::exit(1);
}