//! `hivectl agents` — container lifecycle over the host admin socket
//! (list/restart/restart-all/spawn/kill/destroy/rebuild/set-parent).

use std::path::Path;

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

use crate::cli::AgentsCmd;
use crate::dag_progress::wait_for_dags;
use crate::util::render;

async fn agents_restart(socket: &Path, name: &str, no_wait: bool) -> Result<()> {
    let resp = crate::client::request(
        socket,
        hive_host_sock::HostRequest::Restart {
            name: crate::util::parse_ident(name)?,
        },
    )
    .await
    .with_context(|| format!("connect to daemon socket {}", socket.display()))?;
    if resp.ok {
        println!("restart queued: {name}");
        wait_for_dags(socket, resp.queued_dags.unwrap_or_default(), no_wait).await
    } else {
        bail!(
            "restart {name}: {}",
            resp.error.as_deref().unwrap_or("unknown error")
        )
    }
}

/// `hivectl agents list` — fetch the per-agent status roster from the
/// daemon (`HostRequest::AgentStatus`) and render it as a padded table,
/// or the raw JSON rows with `--json`. Reuses the dashboard's
/// `ContainerView` aggregation, so the CLI and the web UI never drift.
async fn agents_list(socket: &Path, json: bool) -> Result<()> {
    let resp = crate::client::request(socket, hive_host_sock::HostRequest::AgentStatus)
        .await
        .with_context(|| format!("connect to daemon socket {}", socket.display()))?;
    if !resp.ok {
        bail!(
            "agents list: {}",
            resp.error.as_deref().unwrap_or("unknown error")
        );
    }
    let rows = resp.agent_statuses.unwrap_or_default();
    if json {
        println!("{}", serde_json::to_string_pretty(&rows)?);
        return Ok(());
    }
    if rows.is_empty() {
        println!("no managed agents found");
        return Ok(());
    }
    // STATUS collapses the health flags into one space-separated token so
    // the common case (`running`) stays short and anomalies stand out.
    let status_of = |r: &hive_sh4re::AgentStatusRow| -> String {
        let mut s = if r.running { "running" } else { "stopped" }.to_owned();
        if r.needs_login {
            s.push_str(" needs-login");
        }
        if r.needs_update {
            s.push_str(" needs-update");
        }
        s
    };
    let headers = ["NAME", "STATUS", "REV", "PARENT", "REMIND"];
    let table: Vec<[String; 5]> = rows
        .iter()
        .map(|r| {
            [
                r.name.clone(),
                status_of(r),
                r.deployed_sha.clone().unwrap_or_else(|| "-".to_owned()),
                r.parent.clone().unwrap_or_else(|| "-".to_owned()),
                if r.pending_reminders > 0 {
                    r.pending_reminders.to_string()
                } else {
                    "-".to_owned()
                },
            ]
        })
        .collect();
    let mut widths = headers.map(str::len);
    for row in &table {
        for (i, cell) in row.iter().enumerate() {
            widths[i] = widths[i].max(cell.len());
        }
    }
    let fmt_row = |cells: &[String]| -> String {
        cells
            .iter()
            .enumerate()
            .map(|(i, c)| format!("{c:<w$}", w = widths[i]))
            .collect::<Vec<_>>()
            .join("  ")
            .trim_end()
            .to_owned()
    };
    let header_cells: Vec<String> = headers.iter().map(|h| (*h).to_owned()).collect();
    println!("{}", fmt_row(&header_cells));
    for row in &table {
        println!("{}", fmt_row(row));
    }
    Ok(())
}

async fn agents_restart_all(socket: &Path, no_wait: bool) -> Result<()> {
    let resp = crate::client::request(socket, hive_host_sock::HostRequest::RestartAll)
        .await
        .with_context(|| format!("connect to daemon socket {}", socket.display()))?;
    let agents = resp.agents.as_deref().unwrap_or(&[]);
    if agents.is_empty() {
        println!("restart-all: no managed containers found");
    } else {
        for a in agents {
            println!("restart queued: {a}");
        }
    }
    if !resp.ok {
        bail!(
            "restart-all: {}",
            resp.error.as_deref().unwrap_or("unknown error")
        );
    }
    wait_for_dags(socket, resp.queued_dags.unwrap_or_default(), no_wait).await
}

/// Dispatch `hivectl agents <verb>` — container lifecycle over the host
/// admin socket.
pub(crate) async fn run_agents(socket: &Path, cmd: AgentsCmd) -> Result<()> {
    match cmd {
        AgentsCmd::List { json } => agents_list(socket, json).await,
        AgentsCmd::Restart { name, no_wait } => agents_restart(socket, &name, no_wait).await,
        AgentsCmd::RestartAll { no_wait } => agents_restart_all(socket, no_wait).await,
        AgentsCmd::Spawn { name } => {
            let name = crate::util::parse_ident(&name)?;
            render(crate::client::request(socket, HostRequest::Spawn { name }).await?)
        }
        AgentsCmd::RequestSpawn { name } => {
            let name = crate::util::parse_ident(&name)?;
            render(crate::client::request(socket, HostRequest::RequestSpawn { name }).await?)
        }
        AgentsCmd::Kill { name } => {
            let name = crate::util::parse_ident(&name)?;
            render(crate::client::request(socket, HostRequest::Kill { name }).await?)
        }
        AgentsCmd::Destroy { name, purge } => {
            let name = crate::util::parse_ident(&name)?;
            render(crate::client::request(socket, HostRequest::Destroy { name, purge }).await?)
        }
        AgentsCmd::Rebuild { name } => {
            let name = crate::util::parse_ident(&name)?;
            render(crate::client::request(socket, HostRequest::Rebuild { name }).await?)
        }
        AgentsCmd::SetParent {
            child,
            parent,
            root,
        } => {
            let child = crate::util::parse_ident(&child)?;
            let new_parent = if root {
                None
            } else {
                parent.map(|p| crate::util::parse_ident(&p)).transpose()?
            };
            render(
                crate::client::request(socket, HostRequest::SetParent { child, new_parent })
                    .await?,
            )
        }
    }
}