xbp 10.15.4

use crate::commands::ssh_helpers::{prompt_for_input, prompt_for_password};
use crate::config::SshConfig;
use async_ssh2_tokio::client::{AuthMethod, Client, ServerCheckMethod};
use russh::{ChannelMsg, Sig};
use tokio::io::{stderr, stdout, AsyncWriteExt};
use tokio::signal;
use tracing::debug;

/// Run `xbp logs` on a remote host and stream the output locally.
pub async fn run_remote_logs(
    project: Option<String>,
    ssh_host: Option<String>,
    ssh_username: Option<String>,
    ssh_password: Option<String>,
    debug_mode: bool,
) -> Result<(), String> {
    let mut config = SshConfig::load().map_err(|e| format!("Failed to load SSH config: {}", e))?;
    let mut config_dirty = false;

    let resolved_host = resolve_or_prompt(
        ssh_host,
        &mut config.host,
        "Enter SSH host: ",
        &mut config_dirty,
    )?;
    let resolved_username = resolve_or_prompt(
        ssh_username,
        &mut config.username,
        "Enter SSH username: ",
        &mut config_dirty,
    )?;
    let resolved_password = resolve_or_prompt_password(
        ssh_password,
        &mut config.password,
        "Enter SSH password: ",
        &mut config_dirty,
    )?;

    if config_dirty {
        config
            .save()
            .map_err(|e| format!("Failed to save SSH config: {}", e))?;
    }

    let command = build_remote_command(project.as_deref());
    let wrapped_command = wrap_command_with_login_shell(&command);
    if debug_mode {
        debug!(
            "SSH logs target => host: {}, user: {}, command: {}",
            resolved_host, resolved_username, wrapped_command
        );
    }

    let auth = AuthMethod::with_password(&resolved_password);
    let client = Client::connect(
        (resolved_host.as_str(), 22),
        resolved_username.as_str(),
        auth,
        ServerCheckMethod::NoCheck,
    )
    .await
    .map_err(|e| format!("SSH connection failed: {}", e))?;

    let streaming_result = stream_remote_logs(&client, &wrapped_command).await;
    if let Err(err) = client.disconnect().await {
        debug!("Failed to cleanly disconnect SSH session: {}", err);
    }

    streaming_result
}

fn resolve_or_prompt(
    provided: Option<String>,
    stored: &mut Option<String>,
    prompt: &str,
    dirty: &mut bool,
) -> Result<String, String> {
    if let Some(value) = provided {
        if stored.as_ref() != Some(&value) {
            *stored = Some(value.clone());
            *dirty = true;
        }
        return Ok(value);
    }

    if let Some(value) = stored.clone() {
        return Ok(value);
    }

    let value = prompt_for_input(prompt)?;
    *stored = Some(value.clone());
    *dirty = true;
    Ok(value)
}

fn resolve_or_prompt_password(
    provided: Option<String>,
    stored: &mut Option<String>,
    prompt: &str,
    dirty: &mut bool,
) -> Result<String, String> {
    if let Some(value) = provided {
        if stored.as_ref() != Some(&value) {
            *stored = Some(value.clone());
            *dirty = true;
        }
        return Ok(value);
    }

    if let Some(value) = stored.clone() {
        return Ok(value);
    }

    let value = prompt_for_password(prompt)?;
    *stored = Some(value.clone());
    *dirty = true;
    Ok(value)
}

fn build_remote_command(project: Option<&str>) -> String {
    if let Some(project_name) = project {
        format!("xbp logs {}", shell_quote(project_name))
    } else {
        "xbp logs".to_string()
    }
}

/// Run remote commands through a login shell so user PATH settings (e.g., `~/.cargo/bin`)
/// are applied before executing `xbp`.
fn wrap_command_with_login_shell(command: &str) -> String {
    format!("bash -lc {}", shell_quote(command))
}

fn shell_quote(value: &str) -> String {
    if value.is_empty() {
        return "''".to_string();
    }

    if value
        .chars()
        .all(|ch| ch.is_ascii_alphanumeric() || "-_./:@".contains(ch))
    {
        return value.to_string();
    }

    format!("'{}'", value.replace('\'', "'\\''"))
}

async fn stream_remote_logs(client: &Client, command: &str) -> Result<(), String> {
    let mut channel = client
        .get_channel()
        .await
        .map_err(|e| format!("Failed to open SSH channel: {}", e))?;
    channel
        .exec(true, command)
        .await
        .map_err(|e| format!("Failed to execute remote command: {}", e))?;

    let mut stdout = stdout();
    let mut stderr = stderr();
    let mut exit_status: Option<u32> = None;
    let mut ctrl_c_pressed = false;
    let ctrl_c = signal::ctrl_c();
    tokio::pin!(ctrl_c);

    loop {
        tokio::select! {
            msg = channel.wait() => match msg {
                Some(ChannelMsg::Data { ref data }) => {
                    stdout
                        .write_all(data)
                        .await
                        .map_err(|e| format!("Failed to write remote stdout: {}", e))?;
                    stdout
                        .flush()
                        .await
                        .map_err(|e| format!("Failed to flush stdout: {}", e))?;
                }
                Some(ChannelMsg::ExtendedData { ref data, ext }) => {
                    if ext == 1 {
                        stderr
                            .write_all(data)
                            .await
                            .map_err(|e| format!("Failed to write remote stderr: {}", e))?;
                        stderr
                            .flush()
                            .await
                            .map_err(|e| format!("Failed to flush stderr: {}", e))?;
                    }
                }
                Some(ChannelMsg::ExitStatus { exit_status: status }) => {
                    exit_status = Some(status);
                }
                Some(ChannelMsg::ExitSignal { signal_name, .. }) => {
                    if exit_status.is_none() {
                        exit_status = Some(signal_to_exit_status(&signal_name));
                    }
                }
                Some(_) => {}
                None => break,
            },
            _ = &mut ctrl_c => {
                ctrl_c_pressed = true;
                if let Err(err) = channel.signal(Sig::INT).await {
                    debug!("Failed to send interrupt signal: {}", err);
                }
            }
        }
    }

    if ctrl_c_pressed {
        return Ok(());
    }

    if let Some(status) = exit_status {
        if status == 0 {
            Ok(())
        } else {
            Err(format!("Remote command exited with status: {}", status))
        }
    } else {
        Err("Remote command closed without exit status".to_string())
    }
}

fn signal_to_exit_status(signal: &Sig) -> u32 {
    match signal {
        Sig::INT => 130,
        Sig::TERM => 143,
        Sig::QUIT => 131,
        Sig::KILL => 137,
        Sig::HUP => 129,
        Sig::PIPE => 141,
        _ => 128,
    }
}