//! Shared helpers used across hivectl's command handling: daemon
//! request/response plumbing (`daemon_request`, `render`,
//! `render_lifecycle`) and password input (`resolve_password`).

use std::path::Path;

use anyhow::{Context as _, Result, bail};

/// Parse a CLI-supplied agent/account name into a validated
/// [`hive_types::Ident`], mapping the parse error to an `anyhow` error that
/// names the offending input. Used at hivectl's `HostRequest` construction
/// sites so the wire `Ident` fields are built from validated names (the daemon
/// re-validates on deserialize; parsing here gives the operator an immediate,
/// local error instead of a round-trip rejection).
pub(crate) fn parse_ident(name: &str) -> Result<hive_types::Ident> {
    hive_types::Ident::parse(name).map_err(|e| anyhow::anyhow!("invalid agent name {name:?}: {e}"))
}

/// Send a provisioning request to the daemon and print its result lines.
/// The daemon owns the provisioning logic; hivectl just relays the outcome,
/// prefixing any error with `label` (e.g. `forge` / `github`).
pub(crate) async fn daemon_request(
    socket: &Path,
    req: hive_host_sock::HostRequest,
    label: &str,
) -> Result<()> {
    let resp = crate::client::request(socket, req)
        .await
        .with_context(|| format!("connect to daemon socket {}", socket.display()))?;
    if !resp.ok {
        bail!(
            "{label}: {}",
            resp.error.as_deref().unwrap_or("unknown error")
        );
    }
    for line in &resp.messages {
        println!("{line}");
    }
    Ok(())
}

/// Resolve the password the caller asked for, or return `None` to fall
/// back to a random throwaway. `--password <PW>` wins outright;
/// `--password-stdin` reads one line off stdin (trailing newline
/// stripped). Empty stdin is treated as an error so the caller doesn't
/// silently provision an empty-password account.
pub(crate) fn resolve_password(
    password: Option<&str>,
    password_stdin: bool,
) -> Result<Option<String>> {
    if let Some(p) = password {
        return Ok(Some(p.to_owned()));
    }
    if password_stdin {
        use std::io::BufRead as _;
        let stdin = std::io::stdin();
        let mut line = String::new();
        stdin
            .lock()
            .read_line(&mut line)
            .context("read password from stdin")?;
        let trimmed = line.trim_end_matches(['\r', '\n']).to_owned();
        if trimmed.is_empty() {
            bail!("--password-stdin: empty input");
        }
        return Ok(Some(trimmed));
    }
    Ok(None)
}

/// Pretty-print a `HostResponse` as JSON and bail on failure. Used by the
/// agent-lifecycle + approval verbs that just relay a daemon result verbatim.
pub(crate) fn render(resp: hive_host_sock::HostResponse) -> Result<()> {
    println!("{}", serde_json::to_string_pretty(&resp)?);
    if !resp.ok {
        bail!(resp.error.unwrap_or_else(|| "request failed".to_owned()));
    }
    Ok(())
}

/// Render a hive-wide stop/start/restart response: one `<verb>: <name>`
/// line per touched container, then surface any aggregated per-target
/// failure as a non-zero exit. `verb` is the past-tense word printed per
/// item (`stopped` / `started`).
pub(crate) fn render_lifecycle(resp: &hive_host_sock::HostResponse, verb: &str) -> Result<()> {
    let items = resp.agents.as_deref().unwrap_or(&[]);
    if items.is_empty() {
        println!("{verb}: nothing matched the requested scope");
    } else {
        for item in items {
            println!("{verb}: {item}");
        }
    }
    if !resp.ok {
        bail!(
            "{verb}: {}",
            resp.error.as_deref().unwrap_or("unknown error")
        );
    }
    Ok(())
}

/// Best-effort query for this hive's domain + browser-facing web URLs
/// (`HostRequest::Urls`). `None` when the daemon is unreachable.
pub(crate) async fn query_hive_urls(socket: &Path) -> Option<hive_host_sock::HiveUrls> {
    crate::client::request(socket, hive_host_sock::HostRequest::Urls)
        .await
        .ok()
        .and_then(|r| r.urls)
}

/// True when `name` matches an existing hyperhive agent — i.e. it has a
/// persistent state dir under `/var/lib/hyperhive/agents/`. We use the
/// state dir (not the live container list) so kept-state tombstones
/// still resolve as agents — re-provisioning a destroyed-but-kept agent
/// should still drop its token in the existing state tree.
///
/// Uses `try_exists()` rather than `Path::exists()` so a permission
/// error reaching the agents root is surfaced, not collapsed into
/// `false`. The agents root is `0700 hive-core`, so running hivectl
/// without root yields EACCES on traversal — `Path::exists()` would
/// silently report `false`, which callers turn into a misleading "no
/// such agent" (or, for the create-user paths, a silent misclassify of
/// a real agent as a non-agent account). Mapping EACCES to an explicit
/// "needs root" error fixes that first-run footgun, where running a
/// privileged verb without sudo reported as a missing agent.
pub(crate) fn agent_exists(name: &str) -> Result<bool> {
    let Ok(name) = hive_types::Ident::parse(name) else {
        bail!("invalid agent name {name:?}");
    };
    let root = hive_host_sock::agent_state_dir(&name);
    match root.try_exists() {
        Ok(found) => Ok(found),
        Err(e) if e.kind() == std::io::ErrorKind::PermissionDenied => bail!(
            "cannot read the agents root {} (permission denied) - this command needs root; \
             re-run with sudo",
            root.parent().unwrap_or(&root).display()
        ),
        Err(e) => Err(e).with_context(|| format!("check agent state dir {}", root.display())),
    }
}