punktfunk/clients/decky/src/backend.ts

// Bridge to the Python backend (main.py) + shared types.
//
// Every call here is a thin shell over the headless `punktfunk` CLI, so these types are the
// CLI's JSON shapes rather than anything this plugin invents. That is deliberate: the plugin
// used to model the client's stores itself and drifted from them with every field the client
// added.

import { callable } from "@decky/api";

/** A settings profile as the CLI resolves it — ids are dangling-checked and names attached. */
export interface Profile {
  id: string;
  name: string;
}

/**
 * A host answering on mDNS right now (`punktfunk discover --json`).
 *
 * `saved`/`paired` are annotated BY THE CLI against the saved-hosts store — fingerprint first,
 * address second. The plugin does not join the two lists itself; that rule living in one place
 * is what stops this surface disagreeing with the desktop client about the same box.
 */
export interface DiscoveredHost {
  name: string;
  addr: string;
  port: number;
  fp: string; // advertised cert fingerprint (lowercase hex); "" when not advertised
  pair: string; // the HOST's policy: "required" | "optional"
  id: string; // the host's advertised stable id; "" when not advertised
  mgmt: number; // management-API port; 0 = not advertised
  os: string; // OS-identity chain, e.g. "linux/fedora/bazzite"; "" on older hosts
  saved: boolean;
  paired: boolean;
}

/**
 * A host in the shared saved-hosts store (`punktfunk hosts list --probe --json`) — the same
 * `client-known-hosts.json` the desktop client owns.
 *
 * `online` comes from a mDNS-INDEPENDENT probe, so a host reached over Tailscale/VPN is not
 * shown offline merely because it never advertises; `null` means the probe was skipped.
 *
 * `profile` is the host's DEFAULT binding, which a plain connect applies silently. It is not
 * the same thing as `pinned_profiles`, which are the cards a user chose to surface. Both come
 * back already resolved against the profile catalog, so this plugin never opens it.
 */
export interface SavedHost {
  id: string | null; // the record's stable id — the reference a launch should use
  name: string;
  addr: string;
  port: number;
  fp_hex: string; // "" for a placeholder saved by address with no pin yet
  paired: boolean;
  mac: string[];
  os: string;
  last_used: number | null;
  clipboard_sync: boolean;
  profile: Profile | null;
  pinned_profiles: Profile[];
  online: boolean | null;
}

/**
 * Every backend call answers in this shape. `error` is a stable code, never prose:
 *
 * - `client-unavailable` — no client is installed, or the call never ran
 * - `client-outdated`    — the installed client predates the verb (exit 5 + `unknown command`)
 * - `unreachable`        — the host did not answer
 * - `refused`            — trust rejected: a wrong PIN, or a fingerprint that already differs
 * - `needs-pairing`      — the CLI refused because it needs a person
 * - `unresolved`         — nothing matched what was named
 * - `client-error`       — anything else; `detail` carries the CLI's own last line
 */
export interface CliResult {
  ok: boolean;
  error?: string;
  detail?: string;
}

export interface DiscoverResult extends CliResult {
  hosts?: DiscoveredHost[];
}

export interface HostsResult extends CliResult {
  hosts?: SavedHost[];
}

export interface PairResult extends CliResult {
  fp?: string;
}

export interface RunnerInfo {
  runner: string; // absolute path to bin/punktfunkrun.sh
  app_id: string; // flatpak app id
  exists: boolean;
  // Which client the backend resolved: the flatpak, a native install (.deb/rpm/sysext/AUR/nix),
  // or none at all. Older backends send neither field — hence optional.
  client_kind?: "flatpak" | "native" | "none";
  // Absolute path of the native binary; "" for flatpak. Passed to the wrapper as PF_CLIENT_BIN.
  client_bin?: string;
}

export interface UpdateInfo {
  current: string; // installed PLUGIN version (package.json)
  latest: string; // newest plugin version in our registry for this channel
  artifact: string; // immutable zip URL Decky should install
  hash: string; // sha256 of that zip (Decky verifies it)
  channel: string; // "latest" (stable) | "canary"
  update_available: boolean; // a newer PLUGIN build is available
  // The CLIENT versions independently of this plugin, and how it updates depends on how it was
  // installed. A flatpak is a per-user install `sudo flatpak update` never touches, compared by
  // OSTree commit; every other install (.deb/.rpm/pacman/sysext/nix/source) is compared by the
  // client itself against the signed per-channel manifest (`punktfunk-client --check-update`).
  client_update_available: boolean;
  client_current: string; // installed client commit (flatpak) or version (native)
  client_latest: string; // newest client commit (flatpak) or version (native)
  client_install: string; // "flatpak" | "apt" | "dnf" | "pacman" | "sysext" | "nix" | "source" | ""
  // Who can perform the update: "flatpak" (this plugin runs it), "helper" (the client drives the
  // packaged root helper), "none" (nothing here can — show `client_command`).
  client_applier: string;
  client_command: string; // one copy-pastable line that updates this install by hand
  client_opt_in: string; // set when one-tap WOULD work after `usermod -aG punktfunk-update`
  client_error?: string; // the client check couldn't complete (e.g. "client-outdated")
  error?: string; // "update-channel-unknown" (dev build) | "fetch-failed"
}

// Steam-shortcut artwork (assets/ in the plugin dir): base64 PNGs keyed grid / gridwide /
// hero / logo, plus the icon's absolute path (SetShortcutIcon wants a file). Keys for
// missing files are absent.
export interface ShortcutArt {
  grid?: string;
  gridwide?: string;
  hero?: string;
  logo?: string;
  icon_path: string;
}

// ---- The four CLI shells --------------------------------------------------------------

/** Browse the LAN over mDNS. Bounded by the CLI (3 s) plus a cold-start allowance. */
export const discover = callable<[], DiscoverResult>("discover");
/** The saved hosts, probed for reachability, with profiles and pinned cards resolved. */
export const hosts = callable<[], HostsResult>("hosts");
/** The PIN ceremony. `refused` = wrong PIN or a host that isn't armed. */
export const pair = callable<
  [addr: string, port: number, pin: string, name: string],
  PairResult
>("pair");
/**
 * Step 1 of request access: save the host with its ADVERTISED fingerprint, pinned but unpaired.
 * The launch that follows pins the same fingerprint, which is the only thing standing between a
 * 185 s wait for approval and an impostor answering for the host. Idempotent; a host already
 * saved under a DIFFERENT fingerprint comes back `refused` rather than being overwritten.
 */
export const trustHost = callable<
  [addr: string, port: number, fp: string, name: string],
  CliResult
>("trust_host");

// ---- Steam / plugin business (only a Decky plugin can do these) ------------------------

export const runnerInfo = callable<[], RunnerInfo>("runner_info");
export const shortcutArt = callable<[], ShortcutArt>("shortcut_art");
// Install the Steam Input layout (native touchscreen `ts_n` + gamepad passthrough) and point our
// shortcut(s) at it, so the Deck touchscreen reaches the client as native touch with no manual
// controller setup. Best-effort + idempotent; keyed by the shared shortcut NAME (both shortcuts
// use the same name → the same lowercase configset key), so one call covers both.
export const applyControllerConfig = callable<
  [name: string],
  { ok: boolean; applied?: string[]; errors?: string[]; accounts?: number; error?: string; detail?: string }
>("apply_controller_config");
export const killStream = callable<[], { ok: boolean }>("kill_stream");
export const checkUpdate = callable<[force: boolean], UpdateInfo>("check_update");
// Update the client by whichever route its install supports: `flatpak update --user` for the
// flatpak, `punktfunk-client --apply-update` (the packaged root helper) for a one-tap-capable
// native install. Everything else comes back `ok: false, error: "manual"` with `command` — the
// line to run by hand. A package-manager run can take minutes; the backend allows 15.
export const updateClient = callable<
  [],
  {
    ok: boolean;
    updated: boolean;
    staged?: boolean; // installed, but a reboot activates it (rpm-ostree)
    error?: string;
    detail?: string;
    command?: string; // set with error "manual"
  }
>("update_client");