// The capability registry: the single enumeration of what this platform can do, and the unit the owner
// grants to a role.
//
// ── Why capabilities and not routes ──
//
// The obvious model is "list the routes a role may call". It does not survive contact with this codebase.
// A sweep of all 100 mutating platform routes on 2026-08-06 found reads permanently stuck on POST for two
// reasons that are not going away: bodies GET cannot carry (`/stt` multipart audio, `/tts`, `/ocr`,
// `/transcribe`), and credentials that must not sit in a query string where access logs, shell history and
// Referer headers capture them (`/tts/voices` apiKey, the four `/test` endpoints, `/local-providers/probe`).
// Five genuinely free conversions were done in e54d71d; the rest are staying. So the METHOD alone cannot
// carry the read/write distinction — hence `readOnlyWrites` below, declared per capability.
//
// The deeper reason is that a route list is not what the owner is deciding. The owner decides "this person
// gets Gitea". A capability is that decision; the prefixes, sockets and screens it expands to are an
// implementation detail that belongs next to the decision rather than in the granting UI.
//
// ── The four kinds, and why `execution` can never be granted ──
//
//   core       every authenticated account, always. Not grantable because not deniable — signing in
//              without them means a broken app, not a restricted one.
//   app        the grantable surface. This is what the owner hands out per role.
//   execution  NEVER grantable. Owner only, structurally.
//   admin      owner only: the platform administering itself, and the owner's own money and network.
//
// `execution` is the important one. Everything under it runs as the OWNER'S OS user in the owner's home
// directory: the terminal is a real shell, chat spawns `claude` with --dangerously-skip-permissions, tasks
// run arbitrary scripts, the file browser and code editor read and write the owner's disk, the desktop is
// the owner's physical screen. Granting any of them is not a feature flag, it is co-ownership of the
// machine. There is no level of "read" that makes a shell safe, which is why these have no level at all.
// Revisit only if per-user home confinement is ever solved — and that is a project, not a checkbox.
//
// ── Read by default ──
//
// A grant carries a level, `read` or `write`. `read` permits safe methods (GET/HEAD/OPTIONS) anywhere in
// the capability, plus mutations under `personal` — sub-paths that hold the CALLER'S own data and nothing
// else. Music is the worked example: `/favorites`, `/now-playing` and `/playlists` are already per-caller
// in the sidecar contract because every sidecar request carries `X-Officer-User`. So "may a member write
// here" is a property of the endpoint, not a policy knob someone has to remember to set.

export type CapabilityKind = 'core' | 'app' | 'execution' | 'admin';

export type Capability = {
  /** Stable identifier. Stored in the database as the grant's subject — renaming one is a data change. */
  key: string;
  label: string;
  description: string;
  kind: CapabilityKind;
  /**
   * Path prefixes under `/api`, written exactly as they are mounted on protectedRouter in hono.ts —
   * leading slash, no `/api`. The totality check pairs these against the real mount table, so a prefix
   * here that nothing mounts is as much an error as a mount nothing claims.
   */
  api: string[];
  /** WebSocket providers, named as in server.tsx's `handlers` map. */
  ws?: string[];
  /** Frontend route prefixes. Filters the dock and the app registry; never a security boundary. */
  routes?: string[];
  /**
   * Sub-paths, relative to each `api` prefix, that a READ grant may still mutate because they hold only
   * the caller's own data. Matched as a prefix after the capability's own: `/favorites` on the `music`
   * capability permits `POST /api/music/favorites/123`.
   */
  personal?: string[];
  /**
   * Reads that must stay POST — see the note at the top. A read grant permits these paths at any method.
   * Written relative to the capability's `api` prefix, like `personal`.
   */
  readOnlyWrites?: string[];
  /**
   * Routes any authenticated account may call even holding NO grant on this capability, because they act
   * on the caller themselves. `METHOD /exact/path`, relative to the capability's prefix — exact, not a
   * prefix, so this cannot widen by accident.
   *
   * One entry exists and it should stay that way. `PUT /api/users` is self-profile update (useAuth.ts
   * calls it to change your own name and avatar) and has always lived on the same router as the owner-only
   * account administration beside it. Moving it to `/api/user` would be tidier and would break every
   * shipped mobile client, so the honest fix is to say out loud that this one route is not what the
   * capability around it is.
   */
  selfService?: string[];
};

export const CAPABILITIES: Capability[] = [
  // ── core ────────────────────────────────────────────────────────────────────────────────────────
  {
    key: 'account',
    label: 'Account',
    description: 'Sign in, your own profile, password and preferences',
    kind: 'core',
    api: ['/user', '/dock'],
    routes: ['/settings/profile'],
  },
  {
    key: 'bug-report',
    label: 'Report a problem',
    description: 'Send the server owner a bug report',
    kind: 'core',
    api: ['/bug-report'],
  },

  // ── app: the grantable surface ──────────────────────────────────────────────────────────────────
  {
    key: 'gitea',
    label: 'Gitea',
    description: 'Repositories, issues, pull requests and notifications from your own Gitea account',
    kind: 'app',
    api: ['/gitea'],
    routes: ['/gitea'],
    // Every Gitea call is already scoped to the caller's own personal access token — the sidecar resolves
    // the token from the caller's row and the instance from the owner's, so a member holding `read` still
    // acts only as themselves upstream. Gitea's own permissions are the second gate and the real one:
    // a token cannot reach a repository its account cannot reach, whatever this platform thinks.
    //
    // Which is why the whole capability is `personal` rather than a list of sub-paths. Nothing under
    // /api/gitea can affect another Officer user, so withholding write here would only stop someone
    // commenting on their own issues — security theatre with a real cost and no benefit.
    personal: ['/'],
  },
  {
    key: 'music',
    label: 'Music',
    description: 'The music library, playback, and your own favourites and playlists',
    kind: 'app',
    api: ['/music'],
    ws: ['cliamp', 'cliamp-audio'],
    routes: ['/music'],
    // Already per-caller in the sidecar contract (X-Officer-User), which is what makes them safe to write
    // at read level. The library itself — scanning, tags, file moves — is not, and is not listed.
    personal: ['/favorites', '/now-playing', '/playlists', '/queue'],
  },
  {
    key: 'photos',
    label: 'Photos',
    description: 'Browse the photo library',
    kind: 'app',
    api: ['/photos'],
    routes: ['/photos'],
  },
  {
    key: 'jellyfin',
    label: 'Video',
    description: 'Browse and play the Jellyfin library',
    kind: 'app',
    api: ['/jellyfin'],
    routes: ['/jellyfin'],
  },
  {
    key: 'memos',
    label: 'Memos',
    description: 'Notes',
    kind: 'app',
    api: ['/memos'],
    routes: ['/memos'],
  },
  {
    key: 'calendar',
    label: 'Calendar and contacts',
    description: 'Calendars, contacts, and the app passwords that sync them to a phone',
    kind: 'app',
    api: ['/caldav', '/dav'],
    routes: ['/calendar', '/contacts'],
    // App passwords are minted for and revoked by their own owner; `/dav` holds nothing shared.
    personal: ['/'],
  },
  {
    key: 'email',
    label: 'Email',
    description: 'Mail accounts and messages',
    kind: 'app',
    api: ['/email'],
    routes: ['/email'],
  },
  {
    key: 'notify',
    label: 'Notifications',
    description: 'Push notifications to your devices',
    kind: 'app',
    api: ['/notify'],
    // Device registration is the caller's own — a phone subscribing to its own push channel.
    personal: ['/devices', '/subscriptions'],
  },
  {
    key: 'transmission',
    label: 'Transmission',
    description: 'Torrent downloads',
    kind: 'app',
    api: ['/transmission'],
    routes: ['/transmission'],
  },
  {
    key: 'soulseek',
    label: 'Soulseek',
    description: 'Search and download from the Soulseek network',
    kind: 'app',
    api: ['/slskd'],
    routes: ['/soulseek'],
  },
  {
    key: 'invoices',
    label: 'Invoices',
    description: 'InvoiceShelf books',
    kind: 'app',
    api: ['/invoiceshelf'],
    routes: ['/invoices'],
  },
  {
    key: 'vpn',
    label: 'VPN',
    description: 'Enrol your own devices on the tailnet',
    kind: 'app',
    api: ['/vpn'],
    // Minting a pre-auth key for your own device is the entire point of the capability, and the key is
    // bound to the caller. Administering the tailnet is `headscale`, which is admin-only.
    personal: ['/'],
  },
  {
    key: 'dashboards',
    label: 'Dashboards',
    description: 'Your own dashboards and saved layouts',
    kind: 'app',
    api: ['/dashboards'],
    routes: ['/dashboards'],
    personal: ['/'],
  },
  {
    key: 'plans',
    label: 'Plans',
    description: 'Plan documents',
    kind: 'app',
    api: ['/plans'],
    routes: ['/plans'],
  },

  // ── execution: never grantable ──────────────────────────────────────────────────────────────────
  {
    key: 'terminal',
    label: 'Terminal',
    description: 'A real shell as the server owner',
    kind: 'execution',
    api: ['/terminal'],
    ws: ['terminal'],
    routes: ['/terminal'],
  },
  {
    key: 'chat',
    label: 'Chat',
    description: 'The agent, running unsandboxed as the server owner',
    kind: 'execution',
    api: ['/chat'],
    ws: ['chat'],
    routes: ['/chat'],
  },
  {
    key: 'files',
    label: 'Files',
    description: "The server owner's filesystem, and the code editor over it",
    kind: 'execution',
    api: ['/file-browser', '/upload'],
    routes: ['/files', '/code-editor'],
  },
  {
    key: 'tasks',
    label: 'Tasks and jobs',
    description: 'Running capabilities, pipelines and background jobs',
    kind: 'execution',
    api: ['/tasks', '/jobs', '/pipeline-jobs', '/task-logs', '/queue'],
    ws: ['task-runner', 'pipeline'],
    routes: ['/jobs', '/task-logs'],
  },
  {
    key: 'items',
    label: 'Capability authoring',
    description: 'Skills, tools, agents and processes on disk',
    kind: 'execution',
    api: ['/skills', '/tools', '/agents', '/processes', '/rescan'],
  },
  {
    key: 'desktop',
    label: 'Desktop',
    description: "The server owner's physical screen",
    kind: 'execution',
    api: ['/desktop'],
    ws: ['desktop'],
    routes: ['/desktop'],
  },
  {
    key: 'browser',
    label: 'Browser',
    description: 'Drives a real browser on the host',
    kind: 'execution',
    api: ['/browser', '/scrape'],
    routes: ['/browser'],
  },

  // ── admin: the platform administering itself ────────────────────────────────────────────────────
  {
    key: 'server-admin',
    label: 'Server settings',
    description: 'Server configuration, integrations and the activity log',
    kind: 'admin',
    api: ['/server-settings', '/integrations', '/activity', '/system-monitor'],
    routes: ['/settings/server', '/settings/system', '/activity', '/system-monitor'],
  },
  {
    key: 'user-admin',
    label: 'User management',
    description: 'Accounts, roles and what each role may reach',
    kind: 'admin',
    api: ['/users'],
    routes: ['/settings/user-management'],
    // Changing your own name, username and avatar. Owner-only account administration is every other route
    // on this router and stays owner-only — see ownerGate in users-router.ts, which is the second lock.
    selfService: ['PUT /'],
  },
  {
    key: 'headscale',
    label: 'Headscale',
    description: 'The tailnet: machines, routes and ACLs',
    kind: 'admin',
    api: ['/headscale'],
    routes: ['/headscale'],
  },
  {
    key: 'wallet',
    label: 'Wallet',
    description: "The server owner's bitcoin",
    kind: 'admin',
    api: ['/wallet'],
    routes: ['/wallet'],
  },
];

// ── Derived lookups ───────────────────────────────────────────────────────────────────────────────

export const CAPABILITY_BY_KEY = new Map(CAPABILITIES.map((c) => [c.key, c]));

/** The keys an owner may actually hand to a role. `core` is automatic, the other two are owner-only. */
export const GRANTABLE_CAPABILITIES = CAPABILITIES.filter((c) => c.kind === 'app');

/** Available to every signed-in account without a grant. */
export const CORE_CAPABILITIES = CAPABILITIES.filter((c) => c.kind === 'core');

export type CapabilityLevel = 'read' | 'write';

const isPrefixOf = (prefix: string, path: string): boolean =>
  prefix === '/' || path === prefix || path.startsWith(`${prefix}/`);

/**
 * Which capability owns this path? `path` is the full request path (`/api/gitea/...`).
 *
 * Longest prefix wins, so a capability may claim `/dav` while another claims `/dav/something` without the
 * order of the array mattering. Returns null for a path no capability claims — which the totality check
 * below is there to make impossible for anything mounted on protectedRouter.
 */
export function capabilityForApiPath(path: string): Capability | null {
  const rest = path.startsWith('/api') ? path.slice('/api'.length) : path;
  let best: Capability | null = null;
  let bestLength = -1;
  for (const capability of CAPABILITIES) {
    for (const prefix of capability.api) {
      if (isPrefixOf(prefix, rest) && prefix.length > bestLength) {
        best = capability;
        bestLength = prefix.length;
      }
    }
  }
  return best;
}

export function capabilityForWsProvider(provider: string): Capability | null {
  return CAPABILITIES.find((c) => c.ws?.includes(provider)) ?? null;
}

/**
 * Is this an exact self-service route — one any authenticated account may call without holding the
 * capability at all? Matched exactly on method AND path, never as a prefix.
 */
export function isSelfServiceRoute(capability: Capability, method: string, path: string): boolean {
  if (!capability.selfService?.length) return false;
  const rest = path.startsWith('/api') ? path.slice('/api'.length) : path;
  const upper = method.toUpperCase();
  return capability.api.some((prefix) => {
    if (!isPrefixOf(prefix, rest)) return false;
    const sub = rest.slice(prefix.length) || '/';
    return capability.selfService!.includes(`${upper} ${sub}`);
  });
}

const SAFE_METHODS = new Set(['GET', 'HEAD', 'OPTIONS']);

/**
 * May a caller holding `level` on `capability` make this request?
 *
 * `write` is unconditional within the capability. `read` permits safe methods, anything the capability
 * declares as a `readOnlyWrites` read-in-POST-clothing, and mutations confined to `personal` sub-paths.
 */
export function isRequestAllowedAtLevel(
  capability: Capability,
  level: CapabilityLevel,
  method: string,
  path: string,
): boolean {
  if (level === 'write') return true;
  if (SAFE_METHODS.has(method.toUpperCase())) return true;

  const rest = path.startsWith('/api') ? path.slice('/api'.length) : path;
  // Strip whichever of the capability's own prefixes matched, so `personal` entries are written relative
  // to the capability rather than repeated per prefix.
  const withinCapability = capability.api
    .filter((prefix) => isPrefixOf(prefix, rest))
    .map((prefix) => rest.slice(prefix.length) || '/');

  const allowed = [...(capability.personal ?? []), ...(capability.readOnlyWrites ?? [])];
  return withinCapability.some((sub) => allowed.some((entry) => isPrefixOf(entry, sub)));
}
