//! `hivectl` — operator-facing host CLI for hyperhive.
//!
//! Sibling binary to the `hive-c0re` daemon. Where `hive-c0re`'s
//! subcommands focus on the broker / approval / topology surface
//! (`spawn`, `kill`, `rebuild`, `approve` …), `hivectl` covers
//! host-side administration — both manual provisioning operations
//! that work without the daemon running (forge, matrix, gateway) AND
//! daemon-assisted agent management (agents restart/restart-all) that
//! goes through the host admin socket.
//!
//! Verbs read configuration off the same on-disk paths c0re uses
//! (`/var/lib/hyperhive/forge-core-token`,
//! `/var/lib/hyperhive/matrix-register-token`, per-agent state
//! dirs) and reuse the `forge` / `matrix` modules from the
//! `hive-c0re` lib — single source of truth, no duplication.

#[cfg(unix)]
use std::os::unix::process::CommandExt as _;
use std::path::{Path, PathBuf};

use anyhow::{Context as _, Result, bail};
use clap::{Args, Parser, Subcommand};
use hive_c0re::coordinator::Coordinator;

#[derive(Parser)]
#[command(
    name = "hivectl",
    about = "hyperhive host CLI — operator-facing administration",
    long_about = "\
Sibling to the `hive-c0re` daemon binary. Covers host-side admin \
operations that don't go through the broker — manual user \
provisioning on the bundled forge + matrix containers, plus future \
recovery / debugging verbs.\
"
)]
struct Cli {
    /// Path to the hive-c0re host admin socket, used by the daemon-assisted
    /// verbs (`agents`, `stop`, `start`). Global: accepted before or after
    /// the subcommand. Verbs that don't talk to the daemon ignore it.
    #[arg(long, global = true, default_value = DEFAULT_HOST_SOCKET)]
    socket: PathBuf,
    #[command(subcommand)]
    cmd: Cmd,
}

#[derive(Subcommand)]
enum Cmd {
    /// Forgejo user provisioning. Manual entry point to the same
    /// idempotent flow c0re runs automatically at boot
    /// (`forge::ensure_all`) — useful for recovery, ad-hoc reprovisioning,
    /// or single-agent fixes without bouncing the daemon.
    Forge {
        #[command(subcommand)]
        cmd: ForgeCmd,
    },
    /// matrix-tuwunel user provisioning. Manual entry point to the same
    /// idempotent flow c0re runs automatically at boot
    /// (`matrix::ensure_all`) — useful when the boot-time sweep skipped
    /// an agent (e.g. matrix container wasn't up yet) or to re-register
    /// after wiping a token file.
    Matrix {
        #[command(subcommand)]
        cmd: MatrixCmd,
    },
    /// Gateway htpasswd user management. Add, remove, or list users in
    /// an htpasswd file used by the gateway's HTTP Basic auth
    /// (`services.hyperhive.gateway.auth`). Credentials are stored as
    /// `BCrypt` hashes — no extra service or PAM required.
    Gateway {
        #[command(subcommand)]
        cmd: GatewayCmd,
    },
    /// Agent container management. Requires the hive-c0re daemon to be
    /// running (connects to the host admin socket).
    Agents {
        #[command(subcommand)]
        cmd: AgentsCmd,
    },
    /// WireGuard inter-hive mesh setup helpers (`services.hyperhive.swarm`).
    ///
    /// One-time-setup convenience so nobody has to remember the `wg` dance:
    /// `wg init` generates + stores this hive's private key and prints the
    /// public key plus the nix snippet to enable the mesh; `wg peer` prints
    /// the snippet to add a remote hive; `wg status` wraps `wg show`. The
    /// verbs own the imperative state (the key file); the printed nix goes
    /// into the operator's host config (kept in git), so nothing here mutates
    /// declarative config behind the operator's back.
    Wg {
        #[command(subcommand)]
        cmd: WgCmd,
    },
    /// Generate the federation peer-config block for THIS hive — the nix
    /// a peer operator pastes into their `services.hyperhive.swarm.peers`
    /// to trust + reach this hive. Emits `caCert` (+ a `cp` line for the
    /// cert) when this hive serves a self-signed CA, the WireGuard public
    /// key when the mesh key exists, and the `wireguard{Address,Endpoint}`
    /// you pass. The hive's own domain is filled in automatically from the
    /// running daemon (`services.hyperhive.domain`). Reads local state (the
    /// TLS CA cert, the wg key); never mutates. `wg init` calls this at the
    /// end, so a fresh mesh setup prints the hand-over block too.
    PeerConfig {
        /// This hive's WireGuard mesh address (e.g. `10.42.0.1/32`),
        /// emitted as `wireguardAddress`. Omit when not running the mesh.
        #[arg(long)]
        wg_address: Option<String>,
        /// This hive's public WireGuard endpoint (`host:port`), emitted as
        /// `wireguardEndpoint`. Omit when peers dial in / no mesh.
        #[arg(long)]
        wg_endpoint: Option<String>,
    },
    /// Open an interactive Claude session inside an agent container.
    ///
    /// Replaces the current process with `machinectl shell
    /// <name>@h-<name>` running `claude --continue` from the agent's
    /// state dir — drops the operator straight into the agent's live
    /// Claude session with its full loaded context and persona. Requires
    /// root (same as all machinectl shell operations) and the container
    /// must be running.
    ///
    /// To match the harness exactly, choom enters **as the agent user**
    /// (not root) so claude reads the OAuth credentials from the agent's
    /// `/home/<name>/.claude`; runs from the agent's state dir
    /// (`/agents/<name>/state`) so `--continue` resumes the right
    /// per-project session and `CLAUDE.md` loads; and passes the same
    /// `--settings` / `--mcp-config` / `--system-prompt-file` the harness
    /// writes to `/run/hive-config/` (settings, MCP tools, role prompt).
    /// Entering as root (the `machinectl shell` default) loses all of it.
    ///
    /// Pass `--fresh` to start a new Claude session instead of continuing
    /// the most recent one.
    Choom {
        /// Agent name (e.g. `damocles`, `iris`).
        name: String,
        /// Start a fresh Claude session instead of continuing the most
        /// recent one. Without this flag `--continue` is passed to Claude
        /// so the operator joins the agent's ongoing session context.
        #[arg(long)]
        fresh: bool,
    },
    /// Stop containers hive-wide in one operator action. Bare `hivectl
    /// stop` stops **everything** — all sub-agents plus the ci, forge,
    /// gateway, and matrix infra containers. Narrow it with scope flags:
    /// `--agents` (all sub-agents), `--ci` / `--forge` / `--gateway` /
    /// `--matrix` (named infra), and `--agent <name>` (repeatable) for
    /// specific sub-agents. Flags are additive (e.g. `--agents --matrix`).
    /// Requires the hive-c0re daemon (connects to the host admin socket).
    /// hive-c0re itself is never stopped — it services the request.
    Stop {
        #[command(flatten)]
        scope: ScopeArgs,
        /// Gracefully quiesce each agent before stopping, instead of a
        /// hard stop. Each agent is enqueued as a `GracefulStop` on the
        /// rebuild queue: the harness is signalled, runs one
        /// stop-checkpoint turn to flush durable `/state`, drains, then
        /// the container is stopped (bounded by a 3-min timeout that
        /// falls back to a hard stop). Applies to agents only.
        #[arg(long)]
        graceful: bool,
    },
    /// Start containers hive-wide — the inverse of `hivectl stop`. Bare
    /// `hivectl start` starts everything back up; the same scope flags as
    /// `stop` narrow it (`--agents`, `--ci`, `--forge`, `--gateway`,
    /// `--matrix`, `--agent <name>`). Requires the hive-c0re daemon.
    Start {
        #[command(flatten)]
        scope: ScopeArgs,
    },
    /// Restart containers hive-wide — `stop` then `start` over the same
    /// scope. Bare `hivectl restart` restarts **everything** (all sub-agents
    /// plus the ci/forge/gateway/matrix infra containers); the same scope
    /// flags as `stop`/`start` narrow it (`--agents`, `--ci`, `--forge`,
    /// `--gateway`, `--matrix`, `--agent <name>`). If the stop phase reports
    /// a failure the start phase is skipped so the operator can investigate.
    /// Requires the hive-c0re daemon.
    Restart {
        #[command(flatten)]
        scope: ScopeArgs,
        /// Gracefully quiesce each agent on the stop half (see
        /// `stop --graceful`). Applies to agents only.
        #[arg(long)]
        graceful: bool,
    },
    /// Per-agent disk accounting + optional quotas via btrfs qgroups.
    ///
    /// Opt-in: `quota enable` turns on btrfs qgroup accounting for the
    /// agent-state filesystem (a one-time, I/O-heavy rescan — that's why
    /// it isn't automatic). Then `quota show` reports per-agent usage and
    /// `quota limit` caps an agent. No-op on non-btrfs hosts. Operates on
    /// agent state subvolumes (created by the btrfs-subvolume migration);
    /// agents still on a plain dir report no qgroup usage.
    Quota {
        #[command(subcommand)]
        cmd: QuotaCmd,
    },
    /// btrfs subvolume management for agent state dirs.
    ///
    /// New agents get a btrfs subvolume state root automatically (when the
    /// host FS is btrfs); agents that predate that are left on plain dirs.
    /// `subvol upgrade <agent>` opts an existing plain-dir agent into the
    /// subvolume feature set (snapshots, per-subvol usage/quota, migration)
    /// by migrating its state dir in place. Requires the hive-c0re daemon
    /// (for the stop/start) and root (for the privileged migration).
    Subvol {
        #[command(subcommand)]
        cmd: SubvolCmd,
    },
    /// One-shot backfill of historical per-agent turn stats into the OTEL
    /// collector as cumulative `claude_code.token.usage` metrics, so
    /// pre-OTEL token history shows up in grafana alongside the live
    /// stream. Reads each agent's `hyperhive-turn-stats.sqlite` and POSTs
    /// OTLP/HTTP JSON to the collector. Every datapoint is tagged
    /// `hyperhive-migration="true"`. Safe to re-run (cumulative samples
    /// at fixed historical timestamps are idempotent on the backend).
    MigrateStats {
        /// OTLP collector base URL (e.g. `http://10.42.0.1:4318`).
        /// Defaults to `$OTEL_EXPORTER_OTLP_ENDPOINT`, then
        /// `$HYPERHIVE_OTEL_ENDPOINT`.
        #[arg(long)]
        endpoint: Option<String>,
        /// Limit to a single agent (default: every agent with a state dir).
        #[arg(long)]
        agent: Option<String>,
        /// Report datapoint counts without sending anything.
        #[arg(long)]
        dry_run: bool,
    },
    /// Emit the full CLI reference as `CommonMark` to stdout.
    ///
    /// Hidden tooling command (not part of day-to-day operator admin):
    /// walks this binary's own clap command tree and renders every verb,
    /// flag, and help string as markdown. Used by the docs build to keep
    /// the published `hivectl` reference in lockstep with the code — no
    /// hand-maintained command list to drift out of date.
    #[command(hide = true)]
    MarkdownDocs,
    /// Generate a shell completion script for `hivectl` and print it to
    /// stdout.
    ///
    /// Pipe it into your shell's completion path — e.g. for zsh:
    /// `hivectl completions zsh > ~/.zsh/completions/_hivectl` (with that
    /// dir on `$fpath`). The hyperhive NixOS module installs the zsh script
    /// system-wide automatically, so this is mainly for ad-hoc / other-shell
    /// use. Supports bash, zsh, fish, elvish, and powershell.
    Completions {
        /// Shell to emit completions for.
        shell: clap_complete::Shell,
    },
}

/// Shared scope flags for `hivectl stop` / `hivectl start`. With no flag
/// set the verb targets **everything** (all sub-agents + every controllable
/// infra container). Setting any flag restricts to the selected classes,
/// additively.
// One bool per selectable container class, each mapping 1:1 to a clap flag;
// orthogonal toggles, not a state machine — hence the bools allow (mirrors
// `hive_sh4re::LifecycleScope`).
#[allow(clippy::struct_excessive_bools)]
#[derive(Args)]
struct ScopeArgs {
    /// All sub-agent containers.
    #[arg(long)]
    agents: bool,
    /// A specific sub-agent by name. Repeatable: `--agent a --agent b`.
    #[arg(long = "agent", value_name = "NAME")]
    agent: Vec<String>,
    /// The CI runner container (`hive-ci`).
    #[arg(long)]
    ci: bool,
    /// The forge container (`hive-forge`).
    #[arg(long)]
    forge: bool,
    /// The gateway container (`hive-gateway`).
    #[arg(long)]
    gateway: bool,
    /// The matrix container (`hive-matrix`).
    #[arg(long)]
    matrix: bool,
}

impl ScopeArgs {
    fn to_scope(&self) -> hive_sh4re::LifecycleScope {
        hive_sh4re::LifecycleScope {
            agents: self.agents,
            agent_names: self.agent.clone(),
            ci: self.ci,
            forge: self.forge,
            gateway: self.gateway,
            matrix: self.matrix,
        }
    }
}

#[derive(Subcommand)]
enum ForgeCmd {
    /// Create or refresh the Forgejo account + token for `<name>`.
    ///
    /// When `<name>` matches an existing agent (i.e. it has a state
    /// dir under `/var/lib/hyperhive/agents/`), persists the token to
    /// `<state>/forge-token` (idempotent: re-mints + rewrites every
    /// call so the on-disk scope matches the current
    /// `forge::TOKEN_SCOPES`).
    ///
    /// When `<name>` is **not** an agent (a human or any other
    /// non-container account), creates the forgejo user and prints the
    /// freshly-minted token to stdout — no `/var/lib/hyperhive/agents/`
    /// directory is created for the user.
    ///
    /// Without `--password` / `--password-stdin` a random throwaway is
    /// used (fine for agents — they auth by token via tea / hive-forge).
    /// Set a password to log into the forge web UI afterwards.
    /// `--password` is idempotent: re-running with the same value sets
    /// the same password (covers password resets on already-created
    /// accounts since `forgejo admin user create` silently no-ops once
    /// the user exists).
    CreateUser {
        /// Forgejo username. For agents: the container/agent name
        /// (`<n>` in `h-<n>`; manager uses the literal `manager`).
        /// For humans: any forgejo username — `mara`, `damocles`, etc.
        name: String,
        /// Set the account password to this string instead of a random
        /// throwaway. Use this for operator accounts that need to log
        /// into the forge web UI. Mutually exclusive with
        /// `--password-stdin`. WARNING: the password is visible in
        /// shell history + process listings; prefer `--password-stdin`
        /// for anything sensitive.
        #[arg(long)]
        password: Option<String>,
        /// Read the password from stdin (single line, trailing newline
        /// stripped) instead of an inline flag. Mutually exclusive with
        /// `--password`.
        #[arg(long, conflicts_with = "password")]
        password_stdin: bool,
    },
}

#[derive(Subcommand)]
enum MatrixCmd {
    /// Create or refresh the matrix account + access token for `<name>`.
    ///
    /// When `<name>` matches an existing agent (i.e. it has a state
    /// dir under `/var/lib/hyperhive/agents/`), persists the token to
    /// `<state>/matrix-token`. Skips registration when the file is
    /// already populated; delete it to force re-registration.
    ///
    /// When `<name>` is **not** an agent (a human or any other
    /// non-container account), registers the matrix user and prints
    /// the freshly-minted access token to stdout — no
    /// `/var/lib/hyperhive/agents/` directory is created for the user.
    ///
    /// Without `--password` / `--password-stdin` a random throwaway is
    /// used (fine for agents — they auth by `access_token`, never by
    /// password). Set a password to log into a matrix web client
    /// afterwards.
    CreateUser {
        /// Matrix localpart. For agents: the container/agent name.
        /// For humans: any matrix localpart — `mara`, `damocles`, etc.
        name: String,
        /// Set the account password to this string instead of a random
        /// throwaway. Use this for operator accounts that need to log
        /// into matrix web clients via `m.login.password`. Mutually
        /// exclusive with `--password-stdin`. WARNING: the
        /// password is visible in shell history + process listings;
        /// prefer `--password-stdin` for anything sensitive.
        #[arg(long)]
        password: Option<String>,
        /// Read the password from stdin (single line, trailing newline
        /// stripped) instead of an inline flag. Mutually exclusive with
        /// `--password`.
        #[arg(long, conflicts_with = "password")]
        password_stdin: bool,
    },
    /// Provision (or re-provision) the hive system admin matrix account
    /// (`@hive:<server>`). hive-c0re runs this automatically on startup
    /// before the agent sweep so the account is the first registered
    /// user — Conduit/tuwunel grants admin rights to the first user.
    /// Run manually to recover a missing admin token file.
    SyncAdmin,
    /// Promote a matrix user to homeserver admin via the admin API.
    /// Uses the hive system admin token at
    /// `/var/lib/hyperhive/matrix/admin-token`. The `server_name` is
    /// discovered automatically from the running homeserver.
    PromoteUser {
        /// Matrix localpart of the user to promote (e.g. `argus`).
        name: String,
    },
    /// Reset a matrix user's password via the admin API and persist the
    /// new password to `/var/lib/hyperhive/matrix/creds/<name>-password`
    /// so the next `ensure_user_for` (or `create-user`) can re-login.
    ///
    /// After this command succeeds, run `hivectl matrix create-user
    /// <name>` to mint a fresh access token for the agent.
    ResetPassword {
        /// Matrix localpart of the account to reset (e.g. `argus`).
        name: String,
    },
    /// Invite a matrix user to the hive Space (default) or a specific
    /// room. Uses the hive admin token; the admin account must be a
    /// member of the target room with invite power (it owns the hive
    /// Space). Idempotent — already-member / already-invited is a no-op.
    Invite {
        /// User to invite: a full id (`@mara:server`) or a bare
        /// localpart (qualified with the homeserver's `server_name`).
        user: String,
        /// Target room id (`!abc:server`) or alias (`#name:server`).
        /// Omit to invite to the hive Space.
        #[arg(long)]
        room: Option<String>,
    },
}

/// Default htpasswd file path — the host-side location of the gateway's
/// credential store, pre-created by a tmpfiles rule when
/// `services.hyperhive.gateway.auth.enable = true`.
const DEFAULT_HTPASSWD_FILE: &str = "/var/lib/hyperhive/gateway/gateway.htpasswd";

#[derive(Subcommand)]
enum GatewayCmd {
    /// Add a new user or update the password of an existing user in the
    /// gateway htpasswd file. The password is hashed with `BCrypt` (cost 12).
    ///
    /// Pass `--password-stdin` when scripting or when you don't want the
    /// password visible in shell history. The file is created if it does
    /// not exist; its parent directory must already exist.
    CreateUser {
        /// Username to add or update.
        username: String,
        /// Set the password inline. WARNING: visible in shell history and
        /// process listings — prefer `--password-stdin` for sensitive input.
        /// Mutually exclusive with `--password-stdin`.
        #[arg(long, conflicts_with = "password_stdin")]
        password: Option<String>,
        /// Read the password from stdin (single line, trailing newline
        /// stripped). Mutually exclusive with `--password`.
        #[arg(long)]
        password_stdin: bool,
        /// Path to the htpasswd file. Defaults to the standard gateway
        /// credential store at `/var/lib/hyperhive/gateway/gateway.htpasswd`.
        #[arg(long, short = 'f', default_value = DEFAULT_HTPASSWD_FILE)]
        file: PathBuf,
    },
    /// Remove a user from the gateway htpasswd file. Exits with an error
    /// when the user is not found so callers can detect the no-op case.
    DeleteUser {
        /// Username to remove.
        username: String,
        /// Path to the htpasswd file. Defaults to the standard gateway
        /// credential store.
        #[arg(long, short = 'f', default_value = DEFAULT_HTPASSWD_FILE)]
        file: PathBuf,
    },
    /// List all usernames in the gateway htpasswd file, one per line.
    ListUsers {
        /// Path to the htpasswd file. Defaults to the standard gateway
        /// credential store.
        #[arg(long, short = 'f', default_value = DEFAULT_HTPASSWD_FILE)]
        file: PathBuf,
    },
}

#[derive(Subcommand)]
enum WgCmd {
    /// Generate (if absent) this hive's WireGuard private key, print its
    /// public key, and print the nix snippet to enable the mesh. Idempotent:
    /// an existing key is reused, never clobbered (clobbering would break a
    /// live mesh). Share the printed public key with peer hives.
    Init {
        /// This hive's mesh address (e.g. `10.42.0.1/32`) to bake into the
        /// printed snippet. Omit to get a placeholder you fill in.
        #[arg(long)]
        address: Option<String>,
    },
    /// Print the nix snippet to add a peer hive to the mesh. Pure output —
    /// paste it into this hive's config. Get `<pubkey>` from the peer's
    /// `hivectl wg init`.
    Peer {
        /// Peer hive's DNS domain (the `swarm.peers` attrset key).
        domain: String,
        /// Peer's WireGuard public key (from its `hivectl wg init`).
        #[arg(long)]
        pubkey: String,
        /// Peer's mesh address (e.g. `10.42.0.2/32`).
        #[arg(long)]
        address: String,
        /// Peer's `host:port` endpoint (omit for a peer that only dials out,
        /// e.g. one behind NAT — it must set an endpoint pointing back here).
        #[arg(long)]
        endpoint: Option<String>,
    },
    /// Show the live mesh interface state (`wg show wg-hive`). Requires the
    /// mesh to be enabled + up.
    Status,
}

#[derive(Subcommand)]
enum QuotaCmd {
    /// Enable btrfs qgroup accounting on the agent-state filesystem. Run
    /// once before `show` / `limit`. Triggers a full btrfs rescan (I/O
    /// heavy on a large filesystem), so it's a deliberate opt-in.
    /// Idempotent; a no-op on non-btrfs hosts.
    Enable,
    /// Report per-agent disk usage (referenced + exclusive bytes) from
    /// btrfs qgroups. With no name, shows every agent that has a state
    /// subvolume; pass a name to show just that one. Requires `enable`
    /// first.
    Show {
        /// Agent to show (omit for all agents with a state subvolume).
        name: Option<String>,
    },
    /// Set or clear an agent's disk quota (a referenced-usage cap). `size`
    /// accepts a byte count or a `K`/`M`/`G`/`T` suffix (e.g. `5G`), or
    /// `none` to clear the limit. Requires `enable` first.
    Limit {
        /// Agent whose state subvolume to limit.
        name: String,
        /// Size cap (`5G`, `500M`, `1073741824`) or `none` to clear.
        size: String,
    },
}

/// Default host admin socket path. Must match `hive-c0re`'s default in
/// `main.rs` (`/run/hyperhive/host.sock`) — the daemon binds there and
/// `hivectl agents` connects to it.
const DEFAULT_HOST_SOCKET: &str = "/run/hyperhive/host.sock";

#[derive(Subcommand)]
enum AgentsCmd {
    /// Stop and start a single agent container without rebuilding config.
    /// Useful for "kick the container" when the process is stuck or the
    /// container needs a clean restart without changing the NixOS config.
    Restart {
        /// Agent name (e.g. `damocles`, `ruth`).
        name: String,
    },
    /// Stop and restart ALL managed agent containers in sequence.
    /// Iterates the live container list and restarts each one. Any per-agent
    /// failure is reported at the end rather than stopping mid-run, so all
    /// containers get a restart attempt.
    RestartAll,
}

#[derive(Subcommand)]
enum SubvolCmd {
    /// Convert an existing plain-dir agent state root into a btrfs subvolume
    /// in place. Stops the agent (so its state bind-mount is released),
    /// migrates `…/agents/<name>/` to a subvolume preserving
    /// ownership/permissions/xattrs, then restarts it. Idempotent (no-op if
    /// already a subvolume) and safe (the original dir is left untouched on
    /// any failure before the final swap). Requires `--yes` since it bounces
    /// the agent and moves its state.
    Upgrade {
        /// Agent name (e.g. `damocles`, `iris`).
        name: String,
        /// Confirm: this stops the agent, migrates its state dir, and
        /// restarts it. Required — the command refuses without it.
        #[arg(long)]
        yes: bool,
    },
}

#[tokio::main]
async fn main() -> Result<()> {
    tracing_subscriber::fmt()
        .with_env_filter(
            tracing_subscriber::EnvFilter::try_from_default_env()
                .unwrap_or_else(|_| tracing_subscriber::EnvFilter::new("info")),
        )
        .init();
    let cli = Cli::parse();
    let socket = cli.socket;
    match cli.cmd {
        Cmd::Forge { cmd } => match cmd {
            ForgeCmd::CreateUser {
                name,
                password,
                password_stdin,
            } => forge_create_user(&name, password.as_deref(), password_stdin).await,
        },
        Cmd::Matrix { cmd } => match cmd {
            MatrixCmd::CreateUser {
                name,
                password,
                password_stdin,
            } => matrix_create_user(&name, password.as_deref(), password_stdin).await,
            MatrixCmd::SyncAdmin => matrix_sync_admin().await,
            MatrixCmd::PromoteUser { name } => matrix_promote_user(&name).await,
            MatrixCmd::ResetPassword { name } => matrix_reset_password(&name).await,
            MatrixCmd::Invite { user, room } => matrix_invite(&user, room.as_deref()).await,
        },
        Cmd::Gateway { cmd } => match cmd {
            GatewayCmd::CreateUser {
                file,
                username,
                password,
                password_stdin,
            } => gateway_create_user(&file, &username, password.as_deref(), password_stdin),
            GatewayCmd::DeleteUser { file, username } => gateway_delete_user(&file, &username),
            GatewayCmd::ListUsers { file } => gateway_list_users(&file),
        },
        Cmd::Agents { cmd } => match cmd {
            AgentsCmd::Restart { name } => agents_restart(&socket, &name).await,
            AgentsCmd::RestartAll => agents_restart_all(&socket).await,
        },
        Cmd::Wg { cmd } => match cmd {
            WgCmd::Init { address } => wg_init(&socket, address.as_deref()).await,
            WgCmd::Peer {
                domain,
                pubkey,
                address,
                endpoint,
            } => {
                wg_peer(&domain, &pubkey, &address, endpoint.as_deref());
                Ok(())
            }
            WgCmd::Status => wg_status(),
        },
        Cmd::PeerConfig {
            wg_address,
            wg_endpoint,
        } => {
            let domain = require_hive_domain(&socket).await?;
            peer_config(&domain, wg_address.as_deref(), wg_endpoint.as_deref());
            Ok(())
        }
        Cmd::Stop { scope, graceful } => stop(&socket, scope.to_scope(), graceful).await,
        Cmd::Start { scope } => start(&socket, scope.to_scope()).await,
        Cmd::Restart { scope, graceful } => restart(&socket, scope.to_scope(), graceful).await,
        Cmd::Subvol { cmd } => match cmd {
            SubvolCmd::Upgrade { name, yes } => subvol_upgrade(&socket, &name, yes).await,
        },
        Cmd::Choom { name, fresh } => choom(&name, fresh),
        Cmd::MigrateStats {
            endpoint,
            agent,
            dry_run,
        } => hive_c0re::otel_migrate::run(endpoint, agent, dry_run).await,
        Cmd::Quota { cmd } => match cmd {
            QuotaCmd::Enable => quota_enable().await,
            QuotaCmd::Show { name } => quota_show(name.as_deref()).await,
            QuotaCmd::Limit { name, size } => quota_limit(&name, &size).await,
        },
        Cmd::MarkdownDocs => {
            print!("{}", clap_markdown::help_markdown::<Cli>());
            Ok(())
        }
        Cmd::Completions { shell } => {
            generate_completions(shell);
            Ok(())
        }
    }
}

/// Emit a shell completion script for `hivectl` to stdout. Walks the clap
/// command tree (the single source of truth — same tree `markdown-docs`
/// renders) so completions never drift from the actual verbs/flags.
fn generate_completions(shell: clap_complete::Shell) {
    use clap::CommandFactory as _;
    let mut cmd = Cli::command();
    clap_complete::generate(shell, &mut cmd, "hivectl", &mut std::io::stdout());
}

/// Host path of this hive's WireGuard private key (matches the
/// `privateKeyFile` example in the swarm.wireguard nix options).
const WG_KEY_PATH: &str = "/etc/wireguard/hive.key";
/// The mesh interface name hive-c0re's nix module brings up.
const WG_INTERFACE: &str = "wg-hive";

/// Host path of this hive's self-signed CA cert (matches the
/// `services.hyperhive.tls.stateDir` default in hive-tls.nix). Its
/// existence means the gateway serves a self-signed, hive-CA-signed leaf,
/// so a federating peer needs this CA via `swarm.peers.<d>.caCert`. Absent
/// = ACME / operator cert (trusted by the default CA bundle, no `caCert`).
const HIVE_TLS_CA_PATH: &str = "/var/lib/hive-tls/ca.pem";

/// Best-effort query for this hive's domain from the running daemon
/// (`HostRequest::HiveDomain`, which reads `HYPERHIVE_HIVE_DOMAIN` from
/// c0re's service env). `None` when the daemon is unreachable or the
/// domain is unset — callers decide whether that's fatal.
async fn query_hive_domain(socket: &Path) -> Option<String> {
    hive_c0re::client::request(socket, hive_sh4re::HostRequest::HiveDomain)
        .await
        .ok()
        .and_then(|r| r.domain)
}

/// Require this hive's domain from the daemon for snippet generation.
/// Errors with a clear hint when it can't be resolved, so `peer-config`
/// never silently emits a wrong key.
async fn require_hive_domain(socket: &Path) -> Result<String> {
    query_hive_domain(socket).await.context(
        "could not determine this hive's domain from the daemon — is hive-c0re running \
         and `services.hyperhive.domain` set?",
    )
}

/// `wg init` — generate (if absent) the hive's WireGuard key, print its
/// public key + the nix snippet to enable the mesh, then (best-effort)
/// the `peer-config` block peers paste to federate with this hive, so a
/// fresh setup is one command. The domain comes from the daemon; if it
/// can't be resolved, the peer block is skipped (init still succeeds —
/// its core job is enabling the mesh locally).
async fn wg_init(socket: &Path, address: Option<&str>) -> Result<()> {
    use std::os::unix::fs::PermissionsExt as _;
    let key_path = Path::new(WG_KEY_PATH);
    if key_path.exists() {
        println!(
            "WireGuard private key already present at {WG_KEY_PATH} — reusing (not regenerating)."
        );
    } else {
        if let Some(parent) = key_path.parent() {
            std::fs::create_dir_all(parent)
                .with_context(|| format!("create {}", parent.display()))?;
            std::fs::set_permissions(parent, std::fs::Permissions::from_mode(0o700)).ok();
        }
        let out = std::process::Command::new("wg")
            .arg("genkey")
            .output()
            .context("run `wg genkey` (is wireguard-tools installed?)")?;
        if !out.status.success() {
            bail!(
                "wg genkey failed: {}",
                String::from_utf8_lossy(&out.stderr).trim()
            );
        }
        std::fs::write(key_path, &out.stdout)
            .with_context(|| format!("write {}", key_path.display()))?;
        std::fs::set_permissions(key_path, std::fs::Permissions::from_mode(0o400))
            .with_context(|| format!("chmod 400 {}", key_path.display()))?;
        println!("Generated WireGuard private key at {WG_KEY_PATH} (0400).");
    }

    let privkey =
        std::fs::read(key_path).with_context(|| format!("read {}", key_path.display()))?;
    let pubkey = wg_pubkey(&privkey)?;
    let addr = address.unwrap_or("<MESH_ADDRESS e.g. 10.42.0.1/32>");
    println!("\nPublic key (share this with peer hives — they pass it to `hivectl wg peer`):");
    println!("  {pubkey}");
    println!("\nAdd to this hive's NixOS config:");
    println!("  services.hyperhive.swarm.wireguard = {{");
    println!("    enable = true;");
    println!("    privateKeyFile = \"{WG_KEY_PATH}\";");
    println!("    address = \"{addr}\";");
    println!("    # listenPort = 51820;  # default");
    println!("  }};");

    // Also print the block a peer pastes to federate with us (CA + this
    // mesh key) — one-stop setup. Domain comes from the daemon;
    // best-effort, so init still succeeds when it can't be resolved.
    if let Some(d) = query_hive_domain(socket).await {
        println!();
        peer_config(&d, address, None);
    }
    Ok(())
}

/// Derive a WireGuard public key from a private key by piping it through
/// `wg pubkey`.
fn wg_pubkey(privkey: &[u8]) -> Result<String> {
    use std::io::Write as _;
    use std::process::{Command, Stdio};
    let mut child = Command::new("wg")
        .arg("pubkey")
        .stdin(Stdio::piped())
        .stdout(Stdio::piped())
        .stderr(Stdio::piped())
        .spawn()
        .context("run `wg pubkey` (is wireguard-tools installed?)")?;
    child
        .stdin
        .take()
        .context("wg pubkey: stdin unavailable")?
        .write_all(privkey)
        .context("write private key to `wg pubkey`")?;
    let out = child.wait_with_output().context("wait for `wg pubkey`")?;
    if !out.status.success() {
        bail!(
            "wg pubkey failed: {}",
            String::from_utf8_lossy(&out.stderr).trim()
        );
    }
    Ok(String::from_utf8_lossy(&out.stdout).trim().to_owned())
}

/// `wg peer` — print the nix snippet to add a peer hive to the mesh.
/// Pure output (no fallible work), so it returns `()`; the dispatch arm
/// wraps it in `Ok` to match the sibling verbs.
fn wg_peer(domain: &str, pubkey: &str, address: &str, endpoint: Option<&str>) {
    println!("Add to this hive's NixOS config:");
    println!("  services.hyperhive.swarm.peers.\"{domain}\" = {{");
    println!("    wireguardPublicKey = \"{pubkey}\";");
    println!("    wireguardAddress = \"{address}\";");
    if let Some(ep) = endpoint {
        println!("    wireguardEndpoint = \"{ep}\";");
    }
    println!("  }};");
}

/// `peer-config` — print the `swarm.peers."<domain>"` block a peer
/// operator pastes to federate with THIS hive, plus a `cp` line for the
/// CA when this hive is self-signed. Reads local state only (the TLS CA
/// cert presence + the wg key); prints, never mutates.
fn peer_config(domain: &str, wg_address: Option<&str>, wg_endpoint: Option<&str>) {
    let self_signed = Path::new(HIVE_TLS_CA_PATH).exists();
    // CA filename derived from the first DNS label so multiple peers'
    // certs don't collide in the operator's config dir.
    let ca_file = format!("{}-ca.pem", domain.split('.').next().unwrap_or("peer"));
    // WireGuard public key, when this hive has a mesh key. Best-effort:
    // a missing key or absent `wg` binary just omits the mesh lines.
    let wg_pub = std::fs::read(WG_KEY_PATH)
        .ok()
        .and_then(|k| wg_pubkey(&k).ok());

    if self_signed {
        println!("# 1. copy this hive's CA cert next to the peer's config:");
        println!("cp {HIVE_TLS_CA_PATH} ./{ca_file}");
        println!();
        println!("# 2. paste into the peer hive's NixOS config:");
    } else {
        println!("# paste into the peer hive's NixOS config:");
    }
    println!("services.hyperhive.swarm.peers.\"{domain}\" = {{");
    if self_signed {
        println!("  caCert = ./{ca_file};");
    }
    if let Some(pk) = &wg_pub {
        println!("  wireguardPublicKey = \"{pk}\";");
    }
    if let Some(addr) = wg_address {
        println!("  wireguardAddress = \"{addr}\";");
    }
    if let Some(ep) = wg_endpoint {
        println!("  wireguardEndpoint = \"{ep}\";");
    }
    println!("}};");
    if !self_signed {
        println!(
            "# (this hive's cert chains to a public CA — no `caCert` needed; \
             it's trusted by the default bundle.)"
        );
    }
}

/// `wg status` — show the live mesh interface (`wg show wg-hive`),
/// inheriting stdout so the operator sees it directly.
fn wg_status() -> Result<()> {
    let status = std::process::Command::new("wg")
        .args(["show", WG_INTERFACE])
        .status()
        .context("run `wg show` (is wireguard-tools installed?)")?;
    if !status.success() {
        bail!(
            "`wg show {WG_INTERFACE}` failed — is the mesh enabled + up? \
             (services.hyperhive.swarm.wireguard.enable = true, then deploy)"
        );
    }
    Ok(())
}

/// `quota enable` — turn on btrfs qgroup accounting (operator opt-in).
async fn quota_enable() -> Result<()> {
    hive_c0re::priv_client::ensure_btrfs_quota()
        .await
        .context("enable btrfs qgroup accounting")?;
    println!("btrfs qgroup accounting enabled on the agent-state filesystem.");
    println!("(usage may read 0 until btrfs finishes its background rescan)");
    Ok(())
}

/// `quota show [name]` — report per-agent disk usage from btrfs qgroups.
async fn quota_show(name: Option<&str>) -> Result<()> {
    let agents: Vec<String> = match name {
        Some(n) => vec![n.to_owned()],
        None => Coordinator::kept_state_names(),
    };
    if agents.is_empty() {
        println!("no agents with a state dir found");
        return Ok(());
    }
    for agent in &agents {
        match hive_c0re::priv_client::read_subvolume_usage(agent).await {
            Ok((rfer, excl)) => {
                println!(
                    "{agent:<12} referenced {:>10}   exclusive {:>10}",
                    human_bytes(rfer),
                    human_bytes(excl)
                );
            }
            Err(e) => {
                let msg = format!("{e:#}");
                // btrfs-progs prints "ERROR: ... quota not enabled" to stderr
                // when qgroups are off; match the stable fragment case-
                // insensitively rather than an exact line (the surrounding
                // wording varies across btrfs-progs versions).
                if msg.to_ascii_lowercase().contains("quota not enabled") {
                    bail!("btrfs quota not enabled — run `hivectl quota enable` first");
                }
                // A plain-dir agent (no subvolume) has no qgroup; report it
                // inline and keep going rather than aborting the whole sweep.
                println!("{agent:<12} (no qgroup data — plain dir or: {msg})");
            }
        }
    }
    Ok(())
}

/// `quota limit <name> <size>` — set or clear an agent's disk quota.
async fn quota_limit(name: &str, size: &str) -> Result<()> {
    let limit = parse_quota_size(size)?;
    hive_c0re::priv_client::set_subvolume_quota(name, limit)
        .await
        .with_context(|| format!("set quota for {name}"))?;
    match limit {
        Some(n) => println!("set {name} quota to {} ({n} bytes)", human_bytes(n)),
        None => println!("cleared {name} quota"),
    }
    Ok(())
}

/// Parse a quota size: a byte count, a `K`/`M`/`G`/`T`-suffixed value
/// (powers of 1024), or `none` to clear. Rejects overflow + bad input.
fn parse_quota_size(s: &str) -> Result<Option<u64>> {
    let t = s.trim();
    if t.eq_ignore_ascii_case("none") {
        return Ok(None);
    }
    let (num, mult) = match t.chars().last() {
        Some('K' | 'k') => (&t[..t.len() - 1], 1024u64),
        Some('M' | 'm') => (&t[..t.len() - 1], 1024 * 1024),
        Some('G' | 'g') => (&t[..t.len() - 1], 1024 * 1024 * 1024),
        Some('T' | 't') => (&t[..t.len() - 1], 1024u64 * 1024 * 1024 * 1024),
        _ => (t, 1),
    };
    let n: u64 = num.trim().parse().with_context(|| {
        format!("invalid size {s:?} — use a byte count, a K/M/G/T suffix (e.g. 5G), or `none`")
    })?;
    n.checked_mul(mult)
        .map(Some)
        .with_context(|| format!("size {s:?} overflows u64"))
}

/// Format a byte count as a human-friendly KiB/MiB/GiB/TiB string.
#[allow(clippy::cast_precision_loss)] // display-only; precision loss is cosmetic
fn human_bytes(n: u64) -> String {
    const UNITS: [&str; 5] = ["B", "KiB", "MiB", "GiB", "TiB"];
    if n < 1024 {
        return format!("{n} B");
    }
    let mut v = n as f64;
    let mut i = 0;
    while v >= 1024.0 && i < UNITS.len() - 1 {
        v /= 1024.0;
        i += 1;
    }
    format!("{v:.1} {}", UNITS[i])
}

/// 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.
fn is_agent(name: &str) -> bool {
    Coordinator::agent_state_root(name).exists()
}

/// Drop into an interactive Claude session in the agent container.
///
/// Replaces the current process (exec) with `machinectl shell
/// <name>@h-<name> /bin/sh -lc '<script>'`, where the script `cd`s into
/// the agent's state dir and execs claude with the *same* flags the
/// harness uses. Three things matter here, all of which the naive
/// `machinectl shell h-<name> claude` got wrong (issue: choom missing
/// creds + settings):
///
/// 1. **Run as the agent user.** `machinectl shell` defaults to root in
///    the container, so claude would read `/root/.claude` (empty)
///    instead of the agent's `/home/<name>/.claude` where the OAuth
///    credentials live. Prefixing the machine with `<name>@` enters the
///    session as the agent user (the meta-flake sets
///    `hyperhive.user.name` to the agent label, so the unix user name
///    matches the agent name).
/// 2. **Start in the agent's state dir.** `claude --continue` resumes
///    the most recent session *for the current project directory*, and
///    project memory (`CLAUDE.md`) is read from the cwd. The harness
///    runs claude from `/agents/<name>/state`, so choom has to `cd`
///    there or `--continue` finds no session and the persona doesn't
///    load.
/// 3. **Pass the harness's claude flags.** The harness drops
///    `claude-{settings.json,mcp-config.json,system-prompt.md}` into
///    `/run/hive-config/` (`hive-ag3nt::paths::config_dir()`) and runs
///    claude with `--settings` / `--mcp-config` / `--system-prompt-file`
///    pointing at them. A bare `claude --continue` skips all three, so
///    the operator gets default settings, no hyperhive/matrix MCP tools
///    (which `--continue` needs to replay a tool-using history), and no
///    role prompt. choom now mirrors those flags. Each is added only if
///    the file exists, so a mid-restart container degrades to a bare
///    session instead of erroring.
///
/// `machinectl shell` inherits the caller's PTY, so the session is
/// fully interactive. Requires root and a running container.
fn choom(name: &str, fresh: bool) -> Result<()> {
    if !is_agent(name) {
        bail!("no such agent: '{name}' (no state dir under /var/lib/hyperhive/agents/)");
    }
    let container = hive_c0re::lifecycle::container_name(name);
    // The agent's unix user name matches its agent name (meta-flake
    // sets `hyperhive.user.name = <label>`); enter the session as that
    // user so claude sees the right `$HOME/.claude`.
    let target = format!("{name}@{container}");
    let claude = "/run/current-system/sw/bin/claude";
    // In-container state dir (host `/var/lib/hyperhive/agents/<name>/state`
    // is bind-mounted here); matches `hive-ag3nt::paths::state_dir()`.
    let state_dir = format!("/agents/{name}/state");
    // Per-turn config dir the harness writes (RuntimeDirectory
    // `hive-config`); matches `hive-ag3nt::paths::config_dir()`. These
    // are the exact files the harness passes to claude each turn.
    let cfg = "/run/hive-config";
    let continue_flag = if fresh { "" } else { " --continue" };
    // Build the claude argv as the harness does, but only include each
    // flag when its file is present so a half-up container falls back to
    // a bare session rather than a hard claude error. `name` is
    // constrained to `[a-z0-9._-]` so there's nothing to quote.
    // `cd` so `--continue` + CLAUDE.md resolve against the agent's
    // project; `exec` hands the PTY to claude directly.
    let inner = format!(
        "cd {state_dir} || exit 1; set --; \
         [ -f {cfg}/claude-settings.json ] && set -- \"$@\" --settings {cfg}/claude-settings.json; \
         [ -f {cfg}/claude-mcp-config.json ] && set -- \"$@\" --mcp-config {cfg}/claude-mcp-config.json; \
         [ -f {cfg}/claude-system-prompt.md ] && set -- \"$@\" --system-prompt-file {cfg}/claude-system-prompt.md; \
         exec {claude} \"$@\"{continue_flag}"
    );
    let mut cmd = std::process::Command::new("machinectl");
    cmd.arg("shell")
        .arg(&target)
        .arg("/bin/sh")
        .arg("-lc")
        .arg(&inner);
    // exec() replaces the current process — we inherit stdin/stdout/stderr
    // (the caller's PTY) so the Claude session is fully interactive.
    // This call only returns on error.
    let err = cmd.exec();
    Err(anyhow::anyhow!("exec machinectl: {err}"))
}

async fn forge_create_user(name: &str, password: Option<&str>, password_stdin: bool) -> Result<()> {
    if !hive_c0re::forge::is_present().await {
        bail!(
            "hive-forge container not running — wait for hive-c0re to start it before provisioning forge users"
        );
    }
    let user_password = resolve_password(password, password_stdin)?;
    if is_agent(name) {
        if user_password.is_some() {
            bail!(
                "forge create-user: --password / --password-stdin is for non-agent (operator) accounts only; '{name}' is an agent which authenticates via API token"
            );
        }
        hive_c0re::forge::ensure_user_for(name)
            .await
            .with_context(|| format!("forge create-user {name}"))?;
        let path = Coordinator::agent_notes_dir(name).join("forge-token");
        println!("forge: provisioned agent user '{name}'");
        println!("token persisted at: {}", path.display());
    } else {
        let token = hive_c0re::forge::provision_user_token(name, user_password.as_deref())
            .await
            .with_context(|| format!("forge create-user {name}"))?;
        println!("forge: provisioned user '{name}' (not an agent — token not persisted)");
        println!("token: {token}");
        if password.is_some() || password_stdin {
            println!("password: set as supplied — use it to log into the forge web UI");
        } else {
            println!(
                "password: random throwaway (not surfaced — pass --password or --password-stdin to set one you can use)"
            );
        }
    }
    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.
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)
}

async fn matrix_create_user(
    name: &str,
    password: Option<&str>,
    password_stdin: bool,
) -> Result<()> {
    if !hive_c0re::matrix::is_present().await {
        bail!(
            "hive-matrix container not running — start it (services.hyperhive.matrix.enable = true) before provisioning matrix users"
        );
    }
    let register_token =
        hive_c0re::matrix::ensure_register_token().context("read matrix register token")?;
    let client = reqwest::Client::builder()
        .timeout(std::time::Duration::from_secs(30))
        .build()
        .context("build reqwest client")?;
    let user_password = resolve_password(password, password_stdin)?;
    if is_agent(name) {
        if user_password.is_some() {
            // The boot-sweep / approval-time agent provisioning path
            // doesn't accept a password — agents auth by access_token,
            // never by password. Refuse rather than silently dropping it.
            bail!(
                "matrix create-user: --password / --password-stdin is for non-agent (operator) accounts only; '{name}' is an agent which authenticates via access_token"
            );
        }
        hive_c0re::matrix::ensure_user_for(&client, name, &register_token)
            .await
            .with_context(|| format!("matrix create-user {name}"))?;
        let path = Coordinator::agent_notes_dir(name).join("matrix-token");
        println!("matrix: provisioned agent user '{name}'");
        println!("token persisted at: {}", path.display());
    } else {
        let effective_password = match user_password {
            Some(p) => p,
            None => {
                hive_c0re::matrix::random_password().context("generate random matrix password")?
            }
        };
        let token = hive_c0re::matrix::provision_user_token(
            &client,
            name,
            &register_token,
            &effective_password,
        )
        .await
        .with_context(|| format!("matrix create-user {name}"))?;
        println!("matrix: provisioned user '{name}' (not an agent — token not persisted)");
        println!("token: {token}");
        if password.is_some() || password_stdin {
            println!("password: set as supplied — use it to log into a matrix web client");
        } else {
            println!(
                "password: random throwaway (not surfaced — pass --password or --password-stdin to set one you can use)"
            );
        }
    }
    Ok(())
}

async fn matrix_sync_admin() -> Result<()> {
    if !hive_c0re::matrix::is_present().await {
        bail!(
            "hive-matrix container not running — start it (services.hyperhive.matrix.enable = true) first"
        );
    }
    let register_token =
        hive_c0re::matrix::ensure_register_token().context("read matrix register token")?;
    let client = reqwest::Client::builder()
        .timeout(std::time::Duration::from_secs(30))
        .build()
        .context("build reqwest client")?;
    hive_c0re::matrix::ensure_admin_user(&client, &register_token)
        .await
        .context("matrix sync-admin")?;
    let path = hive_c0re::matrix::admin_token_path();
    println!(
        "matrix: hive admin user '@{}' provisioned",
        hive_c0re::matrix::HIVE_ADMIN_LOCALPART
    );
    println!("token persisted at: {}", path.display());
    Ok(())
}

async fn matrix_promote_user(name: &str) -> Result<()> {
    if !hive_c0re::matrix::is_present().await {
        bail!(
            "hive-matrix container not running — start it (services.hyperhive.matrix.enable = true) first"
        );
    }
    let admin_token = hive_c0re::matrix::read_admin_token()?;
    let client = reqwest::Client::builder()
        .timeout(std::time::Duration::from_secs(30))
        .build()
        .context("build reqwest client")?;
    let server_name = hive_c0re::matrix::discover_server_name(&client)
        .await
        .context("discover matrix server_name")?;
    hive_c0re::matrix::promote_user_to_admin(&client, &admin_token, name, &server_name)
        .await
        .with_context(|| format!("matrix promote-user {name}"))?;
    println!("matrix: promoted @{name}:{server_name} to admin");
    Ok(())
}

async fn matrix_invite(user: &str, room: Option<&str>) -> Result<()> {
    if !hive_c0re::matrix::is_present().await {
        bail!(
            "hive-matrix container not running — start it (services.hyperhive.matrix.enable = true) first"
        );
    }
    let admin_token = hive_c0re::matrix::read_admin_token()?;
    let client = reqwest::Client::builder()
        .timeout(std::time::Duration::from_secs(30))
        .build()
        .context("build reqwest client")?;
    let server_name = hive_c0re::matrix::discover_server_name(&client)
        .await
        .context("discover matrix server_name")?;
    let room_id = hive_c0re::matrix::invite_user(&client, &admin_token, user, room, &server_name)
        .await
        .with_context(|| format!("matrix invite {user}"))?;
    let target = if user.starts_with('@') {
        user.to_owned()
    } else {
        format!("@{user}:{server_name}")
    };
    println!("matrix: invited {target} to {room_id}");
    Ok(())
}

async fn matrix_reset_password(name: &str) -> Result<()> {
    if !hive_c0re::matrix::is_present().await {
        bail!(
            "hive-matrix container not running — start it (services.hyperhive.matrix.enable = true) first"
        );
    }
    let admin_token = hive_c0re::matrix::read_admin_token()?;
    let client = reqwest::Client::builder()
        .timeout(std::time::Duration::from_secs(30))
        .build()
        .context("build reqwest client")?;
    let server_name = hive_c0re::matrix::discover_server_name(&client)
        .await
        .context("discover matrix server_name")?;
    hive_c0re::matrix::reset_user_password(&client, &admin_token, name, &server_name)
        .await
        .with_context(|| format!("matrix reset-password {name}"))?;
    // Password is persisted by reset_user_password.
    let pw_path = hive_c0re::paths::matrix_creds_dir().join(format!("{name}-password"));
    println!("matrix: password for @{name}:{server_name} reset");
    println!("password persisted at: {}", pw_path.display());
    println!("next: hivectl matrix create-user {name}   # mints a fresh access token");
    Ok(())
}

// ---------------------------------------------------------------------------
// Gateway htpasswd helpers
// ---------------------------------------------------------------------------

/// Read an htpasswd file into a list of lines, or return an empty list
/// if the file does not exist yet.
fn htpasswd_read(path: &Path) -> Result<Vec<String>> {
    if !path.exists() {
        return Ok(vec![]);
    }
    let content = std::fs::read_to_string(path)
        .with_context(|| format!("read htpasswd file {}", path.display()))?;
    Ok(content.lines().map(str::to_owned).collect())
}

/// Write lines back to `path` atomically (write to `<path>.tmp`, then
/// rename). A trailing newline is always appended to the last line.
fn htpasswd_write(path: &Path, lines: &[String]) -> Result<()> {
    let tmp = path.with_extension("htpasswd.tmp");
    let content = if lines.is_empty() {
        String::new()
    } else {
        let mut s = lines.join("\n");
        s.push('\n');
        s
    };
    std::fs::write(&tmp, &content)
        .with_context(|| format!("write htpasswd tmp {}", tmp.display()))?;
    std::fs::rename(&tmp, path)
        .with_context(|| format!("rename {} → {}", tmp.display(), path.display()))?;
    Ok(())
}

/// Add or update `username` in the htpasswd file at `file`, hashing
/// `password` with `BCrypt` (cost 12). Creates the file when absent.
fn gateway_create_user(
    file: &Path,
    username: &str,
    password: Option<&str>,
    password_stdin: bool,
) -> Result<()> {
    let pw = resolve_password(password, password_stdin)?.ok_or_else(|| {
        anyhow::anyhow!("a password is required — pass --password or --password-stdin")
    })?;
    validate_htpasswd_username(username)?;
    let raw_hash = bcrypt::hash(&pw, 12).context("bcrypt hash")?;
    // nginx auth_basic only recognises $2a$/$2x$/$2y$ — not $2b$. The two
    // prefixes are algorithmically identical; remap so nginx accepts the hash.
    let hash = raw_hash.replacen("$2b$", "$2y$", 1);
    let entry = format!("{username}:{hash}");
    let mut lines = htpasswd_read(file)?;
    let prefix = format!("{username}:");
    if let Some(pos) = lines.iter().position(|l| l.starts_with(&prefix)) {
        lines[pos] = entry;
        htpasswd_write(file, &lines)?;
        println!(
            "gateway: updated password for '{username}' in {}",
            file.display()
        );
    } else {
        lines.push(entry);
        htpasswd_write(file, &lines)?;
        println!("gateway: added user '{username}' to {}", file.display());
    }
    Ok(())
}

/// Remove `username` from the htpasswd file. Errors when the user is
/// not present so callers can detect the no-op case.
fn gateway_delete_user(file: &Path, username: &str) -> Result<()> {
    let mut lines = htpasswd_read(file)?;
    let prefix = format!("{username}:");
    let before = lines.len();
    lines.retain(|l| !l.starts_with(&prefix));
    if lines.len() == before {
        bail!("gateway: user '{username}' not found in {}", file.display());
    }
    htpasswd_write(file, &lines)?;
    println!("gateway: removed user '{username}' from {}", file.display());
    Ok(())
}

/// Print one username per line from the htpasswd file.
fn gateway_list_users(file: &Path) -> Result<()> {
    let lines = htpasswd_read(file)?;
    for line in &lines {
        // Skip blank lines and comments.
        if line.is_empty() || line.starts_with('#') {
            continue;
        }
        if let Some((name, _)) = line.split_once(':') {
            println!("{name}");
        }
    }
    Ok(())
}

// ---------------------------------------------------------------------------
// Agent management helpers (require daemon via host admin socket)
// ---------------------------------------------------------------------------

async fn agents_restart(socket: &Path, name: &str) -> Result<()> {
    let resp = hive_c0re::client::request(
        socket,
        hive_sh4re::HostRequest::Restart {
            name: name.to_owned(),
        },
    )
    .await
    .with_context(|| format!("connect to daemon socket {}", socket.display()))?;
    if resp.ok {
        println!("restarted: {name}");
        Ok(())
    } else {
        bail!(
            "restart {name}: {}",
            resp.error.as_deref().unwrap_or("unknown error")
        )
    }
}

async fn agents_restart_all(socket: &Path) -> Result<()> {
    let resp = hive_c0re::client::request(socket, hive_sh4re::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!("restarted: {a}");
        }
    }
    if !resp.ok {
        bail!(
            "restart-all: {}",
            resp.error.as_deref().unwrap_or("unknown error")
        );
    }
    Ok(())
}

async fn stop(socket: &Path, scope: hive_sh4re::LifecycleScope, graceful: bool) -> Result<()> {
    let resp =
        hive_c0re::client::request(socket, hive_sh4re::HostRequest::Stop { scope, graceful })
            .await
            .with_context(|| format!("connect to daemon socket {}", socket.display()))?;
    render_lifecycle(&resp, "stopped")
}

async fn start(socket: &Path, scope: hive_sh4re::LifecycleScope) -> Result<()> {
    let resp = hive_c0re::client::request(socket, hive_sh4re::HostRequest::Start { scope })
        .await
        .with_context(|| format!("connect to daemon socket {}", socket.display()))?;
    render_lifecycle(&resp, "started")
}

/// Restart = `stop` then `start` over the same scope, composed client-side
/// from the two daemon ops (no dedicated wire op). The stop phase honours
/// `--graceful`; if it reports a failure (`stop` returns `Err`) the `?`
/// short-circuits before the start phase, so a half-stopped hive isn't
/// blindly started over — the operator sees the stop errors and can recover.
async fn restart(socket: &Path, scope: hive_sh4re::LifecycleScope, graceful: bool) -> Result<()> {
    stop(socket, scope.clone(), graceful).await?;
    start(socket, scope).await
}

/// A [`LifecycleScope`](hive_sh4re::LifecycleScope) targeting exactly one
/// agent by name (no infra containers, no all-agents flag).
fn single_agent_scope(name: &str) -> hive_sh4re::LifecycleScope {
    hive_sh4re::LifecycleScope {
        agents: false,
        agent_names: vec![name.to_owned()],
        ci: false,
        forge: false,
        gateway: false,
        matrix: false,
    }
}

/// `subvol upgrade <agent>` — migrate an existing plain-dir agent state root
/// to a btrfs subvolume. Composed client-side (like `restart`): stop the
/// agent so its state bind-mount is released, run the privileged in-place
/// migration via hive-priv, then restart it. The restart is attempted
/// regardless of the migration outcome so a failed migration never leaves
/// the agent down; the migration error (if any) is surfaced afterwards.
async fn subvol_upgrade(socket: &Path, name: &str, yes: bool) -> Result<()> {
    if !is_agent(name) {
        bail!("no agent named {name:?} (no state dir under the agents root)");
    }
    if !yes {
        bail!(
            "`subvol upgrade {name}` stops the agent, migrates its state dir to a btrfs \
             subvolume, then restarts it. Re-run with --yes to proceed."
        );
    }

    println!("stopping {name} (releasing its state bind-mount)…");
    let stop_resp = hive_c0re::client::request(
        socket,
        hive_sh4re::HostRequest::Stop {
            scope: single_agent_scope(name),
            graceful: false,
        },
    )
    .await
    .with_context(|| format!("connect to daemon socket {}", socket.display()))?;
    if !stop_resp.ok {
        bail!(
            "stop {name}: {}",
            stop_resp.error.as_deref().unwrap_or("unknown error")
        );
    }

    println!("migrating {name} state dir to a btrfs subvolume…");
    let upgrade = hive_c0re::priv_client::upgrade_agent_subvolume(name).await;

    // Always attempt the restart, even if the migration failed — don't leave
    // the agent down. Capture the result rather than `?`-ing it so a
    // start-side failure (incl. the IPC call itself erroring) can't mask the
    // migration outcome below.
    println!("starting {name}…");
    let start_result = hive_c0re::client::request(
        socket,
        hive_sh4re::HostRequest::Start {
            scope: single_agent_scope(name),
        },
    )
    .await;

    // Surface the migration outcome FIRST — it's the meaningful result and
    // must not be shadowed by a restart-side failure. On migration failure the
    // original state dir is untouched (the priv op rolls back before the swap).
    upgrade.with_context(|| format!("upgrade {name} state subvolume"))?;

    // Migration succeeded; now surface any restart problem — either the IPC
    // call erroring, or the daemon reporting a failed start. The migration is
    // done regardless, so point at the manual recovery.
    let start_resp = start_result.with_context(|| {
        format!(
            "{name} migrated to a btrfs subvolume, but the restart request to the daemon \
             socket {} failed — run `hivectl start --agent {name}` to bring it back up",
            socket.display()
        )
    })?;
    if !start_resp.ok {
        bail!(
            "{name} migrated to a btrfs subvolume, but restarting it failed: {} — run \
             `hivectl start --agent {name}` to retry",
            start_resp.error.as_deref().unwrap_or("unknown error")
        );
    }
    println!("upgraded {name} to a btrfs subvolume and restarted it");
    Ok(())
}

/// Render a hive-wide stop/start 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`).
fn render_lifecycle(resp: &hive_sh4re::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(())
}

/// Reject usernames containing `:` (field separator) or control chars
/// that would corrupt the htpasswd file format.
fn validate_htpasswd_username(username: &str) -> Result<()> {
    if username.is_empty() {
        bail!("username must not be empty");
    }
    if username.contains(':') {
        bail!("username must not contain ':' (htpasswd field separator)");
    }
    if username.chars().any(char::is_control) {
        bail!("username must not contain control characters");
    }
    Ok(())
}