//! Optional Forgejo wiring — per-agent user + token provisioning,
//! config-repo mirroring, meta read-access grants. Also seeds
//! `internal/docs` — a private repo every agent gets read-only
//! collaborator access to for operator-curated shared content.
//! No-op when `hive-forge` isn't running. Full design: `docs/forge.md`.

use std::path::{Path, PathBuf};

use anyhow::{Context, Result};
use base64::Engine;
use reqwest::StatusCode;
use tokio::process::Command;

use crate::coordinator::Coordinator;

const FORGE_CONTAINER: &str = "hive-forge";
const FORGE_HTTP: &str = "http://localhost:3000";
const TOKEN_NAME_PREFIX: &str = "hyperhive";
/// Where the host-side `core` admin token lives. Used by hive-c0re
/// itself to push the meta repo + drive admin API calls (org
/// creation, future webhook setup, etc.). Root-only.
const CORE_TOKEN_PATH: &str = "/var/lib/hyperhive/forge-core-token";
/// Marker that records whether `ensure_core_avatar` has successfully
/// uploaded the hyperhive logo as `core`'s avatar. One-shot: the
/// upload runs once, the marker is written, subsequent startups skip
/// the call. Delete to force re-upload.
const CORE_AVATAR_MARKER: &str = "/var/lib/hyperhive/forge-core-avatar-set";
/// Sibling marker for the `agent-configs` org avatar. Same one-shot
/// semantics — delete to force the upload to re-run.
const CONFIG_ORG_AVATAR_MARKER: &str = "/var/lib/hyperhive/forge-agent-configs-avatar-set";
/// Per-agent marker written once the account email has been aligned to
/// `{name}@hyperhive`. Skips the `PATCH /api/v1/admin/users/{name}`
/// call on every subsequent `sync_agent` tick — that PATCH was resetting
/// Forgejo's `use_custom_avatar` flag and clobbering the avatar uploaded
/// by `forge-avatar-sync`. Delete to force re-alignment.
const EMAIL_ALIGNED_MARKER_PREFIX: &str = "/var/lib/hyperhive/forge-email-aligned-";
// Avatar PNGs are loaded at runtime from
// `$HIVE_ASSETS_DIR/branding/{hyperhive,agent-configs}.png` via the
// helpers in `hive_sh4re::assets`. The `agent-configs.png` is
// rendered from its SVG during the `hyperhive-assets` derivation's
// build.
/// Forgejo org grouping every agent's applied config repo. Core is a
/// site admin and reads + writes every repo here; agents are NOT
/// members and the repos are private, so no agent — not even the one
/// a repo describes — can reach a config repo through the forge. The
/// applied repos stay hive-c0re-owned on disk; this org is just a
/// mirror target core pushes to.
const CONFIG_ORG: &str = "agent-configs";
/// Forgejo org hosting the operator-curated shared docs/skills repo
/// that every agent gets read-only access to. Agents use it as a
/// common reference without the operator having to bake content into
/// the system prompt or rely on `/shared`. Only the manager + operator
/// (i.e. `core` user) can push.
const SHARED_ORG: &str = "internal";
/// The shared docs repo inside `SHARED_ORG`. Cloneable by every agent
/// at `{FORGE_HTTP}/internal/docs.git`.
const SHARED_DOCS_REPO: &str = "docs";
/// Forgejo orgs hive-c0re ensures on startup. The meta repo lives at
/// `core/meta` (the `core` user's own namespace — no org needed).
const SEEDED_ORGS: &[&str] = &[CONFIG_ORG, SHARED_ORG];
/// Per-agent token scopes (broad-but-not-admin). See
/// `docs/forge.md::Token scopes` for the per-scope rationale.
const TOKEN_SCOPES: &str = "read:user,write:user,read:notification,write:notification,write:repository,write:issue,write:organization,write:misc";

/// Bootstrap `core` token scopes — adds `read:admin,write:admin` on
/// top of `TOKEN_SCOPES` so the host daemon can drive
/// `/api/v1/admin/*`. Site-admin membership alone isn't enough: the
/// token's own scope gate runs before the user-permission check.
/// See `docs/forge.md::Token scopes`.
const CORE_TOKEN_SCOPES: &str = "read:admin,write:admin,read:user,write:user,read:notification,write:notification,write:repository,write:issue,write:organization,write:misc";

/// Token file inside the agent's bind-mounted state dir (visible as
/// `/state/forge-token` from inside the container).
fn token_path(name: &str) -> PathBuf {
    Coordinator::agent_notes_dir(name).join("forge-token")
}

/// Probe whether `hive-forge` exists as a nixos-container. Cheap —
/// `nixos-container list` is just a directory scan in /etc. Routed
/// through hive-priv: `nixos-container` needs root, and hive-c0re runs
/// unprivileged (privsep).
pub async fn is_present() -> bool {
    let Ok(stdout) = crate::priv_client::list_containers().await else {
        return false;
    };
    stdout.lines().any(|l| l.trim() == FORGE_CONTAINER)
}

/// Run `forgejo admin <args>` inside the hive-forge container as the
/// forgejo user (the only uid with write access to the state dir).
/// Returns stdout on success; bails with stderr context on failure.
async fn forge_admin(args: &[&str]) -> Result<String> {
    let mut cmd = Command::new("nixos-container");
    // `runuser` (util-linux, always present in a NixOS container)
    // beats `sudo` here — sudo isn't installed unless `security.sudo`
    // is enabled, and we don't want to depend on that.
    //
    // `--work-path` is mandatory: without it, the admin CLI defaults
    // WorkPath to `dirname(executable)` (a RO nix-store path), then
    // looks for `<WorkPath>/custom/conf/app.ini` which doesn't
    // exist, falls back to defaults, and F3 init tries to mkdir
    // under the nix store and fatals. The systemd unit sets
    // WORK_PATH for the daemon; we mirror it here for the CLI.
    cmd.args([
        "run",
        FORGE_CONTAINER,
        "--",
        "runuser",
        "-u",
        "forgejo",
        "--",
        "forgejo",
        "--work-path",
        "/var/lib/forgejo",
        "admin",
    ]);
    cmd.args(args);
    let out = cmd
        .output()
        .await
        .context("invoke nixos-container run hive-forge -- forgejo admin")?;
    if !out.status.success() {
        anyhow::bail!(
            "forgejo admin {} failed ({}): {}",
            args.join(" "),
            out.status,
            String::from_utf8_lossy(&out.stderr).trim(),
        );
    }
    Ok(String::from_utf8_lossy(&out.stdout).into_owned())
}

/// Pull the access token out of forgejo's success message. Format
/// has shifted across versions (table form vs. "Access token was
/// successfully created: <hex>"), so just hunt the output for the
/// first long hex-looking word.
fn extract_token(output: &str) -> Option<String> {
    output
        .split(|c: char| c.is_whitespace() || c == ',' || c == ':')
        .find(|w| w.len() >= 32 && w.chars().all(|c| c.is_ascii_hexdigit()))
        .map(str::to_owned)
}

/// Canonical email address for a hive agent's Forgejo account.
/// Must match the `user.email` set by `meta::render_flake` so commits
/// by the agent link back to their Forgejo profile page.
fn agent_email(name: &str) -> String {
    format!("{name}@hyperhive.local")
}

/// Thin Forgejo REST helper. Sends `method` to `url` with a JSON body
/// and `Authorization: token <token>`, returns the HTTP status code.
/// All Forgejo API calls that don't shell out to `forgejo admin` go
/// through here — one place for auth header, content-type, error
/// propagation, and the shared reqwest Client.
async fn forge_http(
    method: reqwest::Method,
    url: &str,
    token: &str,
    body: &str,
) -> Result<StatusCode> {
    let client = reqwest::Client::new();
    let resp = client
        .request(method, url)
        .header("Authorization", format!("token {token}"))
        .header("Content-Type", "application/json")
        .body(body.to_owned())
        .send()
        .await
        .with_context(|| format!("forge HTTP request to {url}"))?;
    Ok(resp.status())
}

/// Ensure a forgejo user named `name` exists. Idempotent: forgejo
/// returns a "user already exists" error which we treat as success.
/// `admin` adds `--admin` (site admin) — used for the bootstrap
/// `core` user that drives the API. `password` picks the initial
/// account password: `None` uses `--random-password` (the existing
/// agent provisioning shape — the password is never read, agents auth
/// by token); `Some(pw)` uses `--password <pw>` so the operator path
/// in `hivectl` can set a real password for matrix-style web-UI login.
async fn ensure_user_exists(name: &str, admin: bool, password: Option<&str>) -> Result<()> {
    let email = agent_email(name);
    let mut args = vec!["user", "create", "--username", name, "--email", &email];
    match password {
        Some(pw) => args.extend(["--password", pw, "--must-change-password=false"]),
        None => args.extend(["--random-password", "--must-change-password=false"]),
    }
    if admin {
        args.push("--admin");
    }
    let result = forge_admin(&args).await;
    match result {
        Ok(_) => {
            tracing::info!(%name, "forge: created user");
            Ok(())
        }
        Err(e) => {
            // Forgejo's "already exists" error wording varies; just
            // try the next step and let token issuance surface a
            // real failure if the user truly isn't there.
            let msg = format!("{e:#}");
            if msg.contains("already exists") || msg.contains("user already") {
                tracing::debug!(%name, "forge: user already exists");
                Ok(())
            } else {
                tracing::warn!(%name, error = %msg, "forge: user create unclear; trying token anyway");
                Ok(())
            }
        }
    }
}

/// Set the forgejo password for an existing user. Used by the operator
/// path in `hivectl forge create-user --password` so re-running on an
/// already-created account still updates the password (covers the
/// "I forgot the password I set last week" case + the "argus retried
/// the verb to verify the fix" case — `forgejo admin user create`
/// silently skips a password change once the account exists). Idempotent
/// from the operator's point of view: same password input → same final
/// account state.
async fn change_user_password(name: &str, password: &str) -> Result<()> {
    let args = [
        "user",
        "change-password",
        "--username",
        name,
        "--password",
        password,
    ];
    forge_admin(&args)
        .await
        .with_context(|| format!("forgejo admin user change-password {name}"))?;
    tracing::info!(%name, "forge: changed user password");
    Ok(())
}

/// Idempotently align the Forgejo account email to `agent_email(name)`.
/// Existing agents were created with `{name}@hive.local`; this corrects
/// that so git commits (which use `{name}@hyperhive`) link to profiles.
/// Best-effort: failures are warned, not propagated.
///
/// Marker-guarded: writes `EMAIL_ALIGNED_MARKER_PREFIX{name}` on first
/// success and skips the PATCH on all subsequent calls. This prevents
/// Forgejo's admin-user-edit endpoint from resetting `use_custom_avatar`
/// on every `sync_agent` tick. Delete the marker to force re-alignment.
///
/// Uses the admin REST API (`PATCH /api/v1/admin/users/{name}`) rather
/// than `forgejo admin user edit` because the CLI dropped the `edit`
/// subcommand somewhere between forgejo 8 and current. Body includes
/// `login_name` (required by Forgejo's `EditUserOption` validator) and
/// `source_id = 0` (local auth, the default for users hive-c0re creates).
async fn ensure_user_email(name: &str) {
    let marker = format!("{EMAIL_ALIGNED_MARKER_PREFIX}{name}");
    if std::path::Path::new(&marker).exists() {
        return;
    }
    let Some(token) = core_token() else {
        tracing::debug!(%name, "forge: skipping ensure_user_email — no core token yet");
        return;
    };
    let email = agent_email(name);
    // `login_name` is required by Forgejo's EditUserOption validator.
    // Omitting it caused Forgejo to reset use_custom_avatar on each call.
    let body = format!(r#"{{"email":"{email}","login_name":"{name}","source_id":0}}"#);
    let url = format!("{FORGE_HTTP}/api/v1/admin/users/{name}");
    match forge_http(reqwest::Method::PATCH, &url, &token, &body).await {
        Ok(status) if status.is_success() => {
            std::fs::write(&marker, "").ok();
            tracing::info!(%name, %email, "forge: user email aligned");
        }
        Ok(status) if status == reqwest::StatusCode::FORBIDDEN => {
            // Core token missing admin scope — see
            // `docs/forge.md::Token scopes` migration note.
            tracing::warn!(
                %name, %email, %status,
                "forge: PATCH user email forbidden — core token likely missing admin scope. \
                 Delete {CORE_TOKEN_PATH} and restart hive-c0re to re-mint with the new scopes."
            );
        }
        Ok(status) => {
            tracing::warn!(%name, %email, %status, "forge: PATCH user email returned non-success");
        }
        Err(e) => tracing::warn!(%name, error = %e, "forge: PATCH user email transport error"),
    }
}

/// Mint a fresh access token for `name`. Token name is suffixed with
/// a monotonic clock so re-issuing doesn't collide with an existing
/// token of the same name in the DB. `scopes` is the scope string
/// passed to `forgejo admin user generate-access-token --scopes`;
/// use `TOKEN_SCOPES` for agents, `CORE_TOKEN_SCOPES` for the
/// bootstrap `core` user.
async fn mint_token(name: &str, scopes: &str) -> Result<String> {
    let token_name = format!(
        "{TOKEN_NAME_PREFIX}-{}",
        std::time::SystemTime::now()
            .duration_since(std::time::UNIX_EPOCH)
            .map_or(0, |d| d.as_secs())
    );
    let stdout = forge_admin(&[
        "user",
        "generate-access-token",
        "--username",
        name,
        "--token-name",
        &token_name,
        "--scopes",
        scopes,
    ])
    .await?;
    let token = extract_token(&stdout)
        .with_context(|| format!("parse token from forgejo output: {stdout:?}"))?;
    tracing::debug!(%name, %token_name, "forge: minted access token");
    Ok(token)
}

/// Mint a fresh access token for `name` and persist it to `path`
/// (0600). Wraps [`mint_token`] for callers that want the token on
/// disk under an agent state dir.
async fn mint_and_persist_token(name: &str, path: &Path, scopes: &str) -> Result<()> {
    use std::os::unix::fs::PermissionsExt;
    let token = mint_token(name, scopes).await?;
    if let Some(parent) = path.parent() {
        std::fs::create_dir_all(parent).ok();
    }
    std::fs::write(path, format!("{token}\n"))
        .with_context(|| format!("write token to {}", path.display()))?;
    let _ = std::fs::set_permissions(path, std::fs::Permissions::from_mode(0o600));
    crate::lifecycle::chown_to_agent(name, path, "forge");
    tracing::info!(%name, path = %path.display(), "forge: persisted access token");
    Ok(())
}

/// Ensure `name` has a forgejo user + token file. Always re-mints the
/// token so the on-disk file always reflects the current `TOKEN_SCOPES`.
/// Safe to call on every spawn and on every hive-c0re startup.
pub async fn ensure_user_for(name: &str) -> Result<()> {
    if !is_present().await {
        return Ok(());
    }
    ensure_user_exists(name, false, None).await?;
    ensure_user_email(name).await;
    mint_and_persist_token(name, &token_path(name), TOKEN_SCOPES).await
}

/// Provision a forgejo user for `name` and return the freshly-minted
/// token. Unlike [`ensure_user_for`], the token is **not** persisted to
/// disk — the caller is responsible for storing it. Used by `hivectl
/// forge create-user` for human (non-agent) accounts so we don't create
/// stray `/var/lib/hyperhive/agents/<name>/` directories for users that
/// aren't agents.
///
/// `password` picks the account password. `None` keeps the existing
/// random-throwaway shape (caller doesn't need web UI access — token
/// alone is enough). `Some(pw)` sets `pw` as the password, including
/// running `forgejo admin user change-password` if the account already
/// exists, so the operator can log into the forge web UI afterwards.
/// Idempotent: re-running with the same `Some(pw)` lands on the same
/// final state.
pub async fn provision_user_token(name: &str, password: Option<&str>) -> Result<String> {
    if !is_present().await {
        anyhow::bail!(
            "hive-forge container not running — start it (services.hyperhive.forge.enable = true) before provisioning forge users"
        );
    }
    ensure_user_exists(name, false, password).await?;
    if let Some(pw) = password {
        // `user create` silently no-ops on an existing account, so
        // we run change-password unconditionally when the caller
        // asked for a specific password — keeps the verb idempotent
        // for "set or reset" use.
        change_user_password(name, pw).await?;
    }
    ensure_user_email(name).await;
    mint_token(name, TOKEN_SCOPES).await
}

/// Set `core`'s Forgejo avatar to the hyperhive logo once, then
/// remember it so subsequent startups don't re-upload. Best-effort
/// — any non-2xx is logged at the caller; the project runs fine
/// with the default hash identicon.
async fn ensure_core_avatar(token: &str) -> Result<()> {
    let marker = std::path::Path::new(CORE_AVATAR_MARKER);
    if marker.exists() {
        return Ok(());
    }
    let png_path = hive_sh4re::assets::core_avatar_png();
    let png_bytes = tokio::fs::read(&png_path)
        .await
        .with_context(|| format!("read core avatar PNG from {}", png_path.display()))?;
    let body = format!(
        r#"{{"image":"{}"}}"#,
        base64::engine::general_purpose::STANDARD.encode(&png_bytes),
    );
    let url = format!("{FORGE_HTTP}/api/v1/admin/users/core/avatar");
    let status = forge_http(reqwest::Method::POST, &url, token, &body).await?;
    if !status.is_success() {
        anyhow::bail!("set core avatar: HTTP {status}");
    }
    if let Some(parent) = marker.parent() {
        std::fs::create_dir_all(parent).ok();
    }
    std::fs::write(marker, "").ok();
    tracing::info!("forge: set core user avatar to hyperhive logo");
    Ok(())
}

/// Set the `agent-configs` org's Forgejo avatar to the
/// configs-stack glyph once. Sibling to `ensure_core_avatar`:
/// one-shot, marker-guarded, best-effort. Forgejo's per-org avatar
/// endpoint is `POST /api/v1/orgs/{org}/avatar` with a base64-PNG
/// JSON body — same shape as the admin user endpoint above.
async fn ensure_config_org_avatar(token: &str) -> Result<()> {
    let marker = std::path::Path::new(CONFIG_ORG_AVATAR_MARKER);
    if marker.exists() {
        return Ok(());
    }
    let png_path = hive_sh4re::assets::config_org_avatar_png();
    let png_bytes = tokio::fs::read(&png_path)
        .await
        .with_context(|| format!("read {CONFIG_ORG} avatar PNG from {}", png_path.display()))?;
    let body = format!(
        r#"{{"image":"{}"}}"#,
        base64::engine::general_purpose::STANDARD.encode(&png_bytes),
    );
    let url = format!("{FORGE_HTTP}/api/v1/orgs/{CONFIG_ORG}/avatar");
    let status = forge_http(reqwest::Method::POST, &url, token, &body).await?;
    if !status.is_success() {
        anyhow::bail!("set {CONFIG_ORG} avatar: HTTP {status}");
    }
    if let Some(parent) = marker.parent() {
        std::fs::create_dir_all(parent).ok();
    }
    std::fs::write(marker, "").ok();
    tracing::info!(
        org = CONFIG_ORG,
        "forge: set org avatar to configs-stack logo"
    );
    Ok(())
}

/// Ensure the bootstrap `core` admin user + a token at
/// `CORE_TOKEN_PATH`. The token is what hive-c0re uses for forgejo
/// API calls (org creation now, meta-repo push later). Returns the
/// token. Idempotent: skips creation when user exists, skips token
/// when the file is present.
async fn ensure_core_user_and_token() -> Result<String> {
    let path = std::path::Path::new(CORE_TOKEN_PATH);
    if let Ok(existing) = std::fs::read_to_string(path) {
        let trimmed = existing.trim().to_owned();
        if !trimmed.is_empty() {
            return Ok(trimmed);
        }
    }
    ensure_user_exists("core", true, None).await?;
    mint_and_persist_token("core", path, CORE_TOKEN_SCOPES).await?;
    let raw = std::fs::read_to_string(path)
        .with_context(|| format!("read {CORE_TOKEN_PATH} after mint"))?;
    Ok(raw.trim().to_owned())
}

/// JSON body for a private, empty repo defaulting to `main`.
fn repo_body(name: &str) -> String {
    format!(r#"{{"name":"{name}","auto_init":false,"private":true,"default_branch":"main"}}"#)
}

/// POST a repo-creation request to `url` and fold "already exists"
/// (HTTP 409 / 422) into success. `label` is `<owner>/<name>` — purely
/// for log + error context.
async fn create_repo(url: &str, body: &str, token: &str, label: &str) -> Result<()> {
    let status = forge_http(reqwest::Method::POST, url, token, body).await?;
    match status.as_u16() {
        201 => {
            tracing::info!(%label, "forge: created repo");
            Ok(())
        }
        409 | 422 => {
            tracing::debug!(%label, "forge: repo already exists");
            Ok(())
        }
        other => anyhow::bail!("POST {url} ({label}) returned HTTP {other}"),
    }
}

/// Create a repo in the token-owner's own namespace. `token` belongs
/// to the user we want the repo owned by (we use `core`'s token for
/// `core/meta`). Idempotent.
pub async fn ensure_repo(name: &str, token: &str) -> Result<()> {
    create_repo(
        &format!("{FORGE_HTTP}/api/v1/user/repos"),
        &repo_body(name),
        token,
        &format!("core/{name}"),
    )
    .await
}

/// Create `name` inside org `org` (used for `agent-configs/<agent>`).
/// Idempotent.
async fn ensure_org_repo(org: &str, name: &str, token: &str) -> Result<()> {
    create_repo(
        &format!("{FORGE_HTTP}/api/v1/orgs/{org}/repos"),
        &repo_body(name),
        token,
        &format!("{org}/{name}"),
    )
    .await
}

/// Read the persisted core token, or None when the forge isn't
/// seeded yet. Cheap — just a file read.
pub fn core_token() -> Option<String> {
    std::fs::read_to_string(CORE_TOKEN_PATH)
        .ok()
        .map(|s| s.trim().to_owned())
        .filter(|s| !s.is_empty())
}

/// Push `dir` (the meta repo) to `core/meta` on the local forge.
/// Best-effort: returns Err which callers log + ignore. No-op when
/// the core token isn't present (forge not enabled).
pub async fn push_meta(dir: &Path) -> Result<()> {
    let Some(token) = core_token() else {
        return Ok(());
    };
    // Token-in-URL push. Forgejo accepts `oauth2:<token>` or just
    // any-username:<token>; using `core` matches the owner so the
    // remote name is self-describing.
    let url = format!("http://core:{token}@localhost:3000/core/meta.git");
    let out = Command::new("git")
        .current_dir(dir)
        .args(["push", "--force", &url, "HEAD:main"])
        .output()
        .await
        .context("invoke git push core/meta")?;
    if !out.status.success() {
        anyhow::bail!(
            "git push core/meta failed ({}): {}",
            out.status,
            String::from_utf8_lossy(&out.stderr).trim()
        );
    }
    tracing::info!("forge: pushed meta to core/meta");
    Ok(())
}

/// Ensure the `agent-configs/<name>` repo exists so the first
/// `push_config` doesn't 404. No-op when the forge isn't running or
/// the core token isn't minted yet. Safe to call on every spawn and
/// on every startup.
pub async fn ensure_config_repo(name: &str) -> Result<()> {
    if !is_present().await {
        return Ok(());
    }
    let Some(token) = core_token() else {
        return Ok(());
    };
    ensure_org_repo(CONFIG_ORG, name, &token).await
}

/// Ensure the `internal/docs` repo exists. Called once at startup
/// after `ensure_org(SHARED_ORG)`. Idempotent — `ensure_org_repo`
/// treats 409 as success.
pub async fn ensure_shared_docs_repo(core_token: &str) -> Result<()> {
    ensure_org_repo(SHARED_ORG, SHARED_DOCS_REPO, core_token).await
}

/// Grant agent `name` read-only collaborator access to `internal/docs`.
/// Idempotent: HTTP 204 (already a collaborator) is treated as success.
/// Mirrors `meta_read_access` so agents can clone the shared docs repo
/// without authentication hassle.
pub async fn shared_docs_access(name: &str, core_token: &str) -> Result<()> {
    let url =
        format!("{FORGE_HTTP}/api/v1/repos/{SHARED_ORG}/{SHARED_DOCS_REPO}/collaborators/{name}");
    let body = r#"{"permission":"read"}"#;
    let out = Command::new("curl")
        .args([
            "-sS",
            "-o",
            "/dev/null",
            "-w",
            "%{http_code}",
            "-X",
            "PUT",
            "-H",
            "Content-Type: application/json",
            "-H",
            &format!("Authorization: token {core_token}"),
            "-d",
            body,
            &url,
        ])
        .output()
        .await
        .context("invoke curl PUT internal/docs/collaborators")?;
    let code = String::from_utf8_lossy(&out.stdout).trim().to_owned();
    match code.as_str() {
        "204" => {
            tracing::info!(%name, "forge: granted shared-docs read access");
            Ok(())
        }
        other => anyhow::bail!(
            "PUT {SHARED_ORG}/{SHARED_DOCS_REPO}/collaborators/{name} returned HTTP {other}"
        ),
    }
}

/// Grant agent `name` read-only collaborator access to `core/meta` on
/// the forge so the agent can clone/fetch the meta flake. Idempotent:
/// HTTP 204 (already a collaborator) is treated as success.
pub async fn meta_read_access(name: &str, core_token: &str) -> Result<()> {
    let url = format!("{FORGE_HTTP}/api/v1/repos/core/meta/collaborators/{name}");
    let body = r#"{"permission":"read"}"#;
    let out = Command::new("curl")
        .args([
            "-sS",
            "-o",
            "/dev/null",
            "-w",
            "%{http_code}",
            "-X",
            "PUT",
            "-H",
            "Content-Type: application/json",
            "-H",
            &format!("Authorization: token {core_token}"),
            "-d",
            body,
            &url,
        ])
        .output()
        .await
        .context("invoke curl PUT core/meta/collaborators")?;
    let code = String::from_utf8_lossy(&out.stdout).trim().to_owned();
    match code.as_str() {
        "204" => {
            tracing::info!(%name, "forge: granted meta read access");
            Ok(())
        }
        other => anyhow::bail!("PUT core/meta/collaborators/{name} returned HTTP {other}"),
    }
}

/// Add `http://localhost:3000/core/meta.git` as the `meta` remote in
/// the agent's proposed config repo so the agent (and the manager) can
/// fetch the meta flake from the forge. Idempotent: no-op when the
/// remote already points at the right URL, or when the proposed repo
/// does not exist yet. No-op when the forge is not running.
pub async fn ensure_meta_remote(name: &str) -> Result<()> {
    if !is_present().await {
        return Ok(());
    }
    let proposed_dir = Coordinator::agent_proposed_dir(name);
    if !proposed_dir.join(".git").exists() {
        return Ok(());
    }
    let want = format!("{FORGE_HTTP}/core/meta.git");
    let existing = crate::lifecycle::git_command()
        .current_dir(&proposed_dir)
        .args(["remote", "get-url", "meta"])
        .output()
        .await
        .context("git remote get-url meta")?;
    if existing.status.success() {
        let current = String::from_utf8_lossy(&existing.stdout).trim().to_owned();
        if current == want {
            return Ok(());
        }
        crate::lifecycle::git(&proposed_dir, &["remote", "set-url", "meta", &want]).await
    } else {
        crate::lifecycle::git(&proposed_dir, &["remote", "add", "meta", &want]).await
    }
}

/// Mirror agent `name`'s applied config repo — `main` plus every tag
/// (`proposal` / `approved` / `building` / `deployed` / `failed` /
/// `denied`) — to `agent-configs/<name>` on the local forge.
/// Best-effort: returns Err which callers log + ignore. No-op when the
/// forge isn't seeded or the applied repo doesn't exist yet.
///
/// Call this after every hive-c0re mutation of an applied repo's refs
/// so the forge copy always reflects what core actually did. `--force`
/// because a failed build rolls `main` backwards to the last-good sha.
///
/// The tokenised URL is passed straight to `git push` and deliberately
/// never stored as a named remote: the applied repo is bind-mounted
/// READ-ONLY into the manager container (`/applied`), so a token in
/// `.git/config` would leak core's admin credential to an agent.
pub async fn push_config(name: &str) -> Result<()> {
    let Some(token) = core_token() else {
        return Ok(());
    };
    let dir = Coordinator::agent_applied_dir(name);
    if !dir.join(".git").exists() {
        return Ok(());
    }
    let url = format!("http://core:{token}@localhost:3000/{CONFIG_ORG}/{name}.git");
    let out = crate::lifecycle::git_command()
        .current_dir(&dir)
        .args([
            "push",
            "--force",
            &url,
            "refs/heads/main:refs/heads/main",
            "refs/tags/*:refs/tags/*",
        ])
        .output()
        .await
        .context("invoke git push agent-configs")?;
    if !out.status.success() {
        anyhow::bail!(
            "git push {CONFIG_ORG}/{name} failed ({}): {}",
            out.status,
            String::from_utf8_lossy(&out.stderr).trim()
        );
    }
    tracing::info!(%name, "forge: mirrored applied config to agent-configs");
    Ok(())
}

/// POST `/api/v1/orgs` to create an org named `name`. Idempotent:
/// HTTP 422 ("user already exists") is treated as success.
async fn ensure_org(name: &str, admin_token: &str) -> Result<()> {
    let body = format!(r#"{{"username":"{name}"}}"#);
    let url = format!("{FORGE_HTTP}/api/v1/orgs");
    let status = forge_http(reqwest::Method::POST, &url, admin_token, &body).await?;
    match status.as_u16() {
        201 => {
            tracing::info!(%name, "forge: created org");
            Ok(())
        }
        422 | 409 => {
            tracing::debug!(%name, "forge: org already exists");
            Ok(())
        }
        other => anyhow::bail!("POST /api/v1/orgs name={name} returned HTTP {other}"),
    }
}

/// Per-agent forge sync: ensure the agent has a forgejo user + token,
/// a mirrored config repo, read access to `core/meta`, and the `meta`
/// remote in its proposed repo. All operations are idempotent; failures
/// are logged as warnings but don't abort the caller.
///
/// `core_token` is `core_token()` — passed in so callers that already
/// fetched it don't re-read the file. Pass `None` to skip the
/// `meta_read_access` step (safe: the access grant is best-effort).
///
/// Called by both `ensure_all()` (startup sweep) and `rebuild_agent`
/// (per-rebuild) so the two paths stay equivalent.
pub async fn sync_agent(name: &str, core_token: Option<&str>) {
    if let Err(e) = ensure_user_for(name).await {
        tracing::warn!(%name, error = ?e, "forge: ensure_user failed");
    }
    // Align email to match the git user.email set by meta::render_flake
    // so commits link to the agent's Forgejo profile. Best-effort;
    // also patches up agents created before this fix (old @hive.local).
    ensure_user_email(name).await;
    // Mirror the agent's applied config repo into agent-configs.
    // ensure_config_repo is idempotent; push_config catches any
    // drift since the last run — e.g. the startup migration just
    // relocated `deployed/0`, or a deploy landed while the forge
    // was down.
    if let Err(e) = ensure_config_repo(name).await {
        tracing::warn!(%name, error = ?e, "forge: ensure_config_repo failed");
    }
    if let Err(e) = push_config(name).await {
        tracing::warn!(%name, error = ?e, "forge: push_config failed");
    }
    // Grant read-only access to core/meta and wire the `meta` remote
    // into the proposed repo so agents can fetch their deployment context.
    if let Some(token) = core_token
        && let Err(e) = meta_read_access(name, token).await
    {
        tracing::warn!(%name, error = ?e, "forge: ensure_meta_read_access failed");
    }
    if let Err(e) = ensure_meta_remote(name).await {
        tracing::warn!(%name, error = ?e, "forge: ensure_meta_remote failed");
    }
    // Grant read-only access to internal/docs so the agent can clone
    // the operator-curated shared skills/runbook repo. Best-effort.
    if let Some(token) = core_token
        && let Err(e) = shared_docs_access(name, token).await
    {
        tracing::warn!(%name, error = ?e, "forge: shared_docs_access failed");
    }
}

/// Sweep every existing container (manager + sub-agents) and ensure
/// each has a forgejo user + token, plus an `agent-configs/<name>`
/// repo mirroring its applied config. Also seeds the `core` admin
/// user (hive-c0re's own identity for pushing the meta repo + driving
/// the API), the `agent-configs` org, and the `core/meta` repo.
/// Called once at hive-c0re startup. Per-step failures are logged
/// but don't abort the sweep.
pub async fn ensure_all() {
    if !is_present().await {
        tracing::debug!("forge: hive-forge container absent, skipping user sweep");
        return;
    }
    let core_token = match ensure_core_user_and_token().await {
        Ok(t) => Some(t),
        Err(e) => {
            tracing::warn!(error = ?e, "forge: ensure_core_user_and_token failed");
            None
        }
    };
    if let Some(token) = core_token.as_deref() {
        for org in SEEDED_ORGS {
            if let Err(e) = ensure_org(org, token).await {
                tracing::warn!(%org, error = ?e, "forge: ensure_org failed");
            }
        }
        // Meta repo lives at core/meta — pushed from git_commit in
        // meta.rs on every deploy/lock-update. Make sure it exists
        // before the first push hits a 404.
        if let Err(e) = ensure_repo("meta", token).await {
            tracing::warn!(error = ?e, "forge: ensure_repo core/meta failed");
        }
        // Seed the shared docs repo. internal is already in
        // SEEDED_ORGS above so the org exists; ensure the repo itself.
        if let Err(e) = ensure_shared_docs_repo(token).await {
            tracing::warn!(error = ?e, "forge: ensure_shared_docs_repo failed");
        }
        if let Err(e) = ensure_core_avatar(token).await {
            tracing::warn!(error = ?e, "forge: ensure_core_avatar failed");
        }
        if let Err(e) = ensure_config_org_avatar(token).await {
            tracing::warn!(error = ?e, "forge: ensure_config_org_avatar failed");
        }
    }
    let Ok(containers) = crate::lifecycle::list().await else {
        tracing::warn!("forge: nixos-container list failed; skipping user sweep");
        return;
    };
    for c in containers {
        let Some(name) = c.strip_prefix(crate::lifecycle::AGENT_PREFIX) else {
            continue;
        };
        sync_agent(name, core_token.as_deref()).await;
    }
}