/*
  Generates the PLATFORM skill — the reference an agent opens when a user asks what the platform can do.

  ── Why generated ──

  Because a hand-written one rots, and we measured it. Spotlight's settings list was hand-written and drifted
  within two days: nine rows against twenty-one sections, and a route that does not exist. `CLAUDE.md` claimed
  27 permission entries against 18, and twenty PM2 processes against thirteen, both for over a week.

  A skill is worse than a doc when it is wrong, because an agent quotes it with confidence and the user has no
  way to tell. So the parts a registry can answer are derived here, at generation time, from the registry —
  and the prose is limited to what no registry can express.

  ── The split, and where the line is ──

    GENERATED   permissions: key, label, kind, api prefixes, sockets, frontend routes
                keyboard shortcuts
    PROSE       what the platform IS, what a permission KIND means for a user, where to look next

  Run `bun run skills:platform`. `bun run docs:check` regenerates into memory and fails if the committed file
  differs, so a stale skill is a failed check rather than a confident wrong answer.
*/

import { writeFileSync, readFileSync, existsSync, mkdirSync } from 'node:fs';
import { join, resolve } from 'node:path';

const ROOT = resolve(import.meta.dir, '..');
export const SKILL_PATH = join(ROOT, '..', 'capabilities', 'skills', 'platform', 'SKILL.md');

const KIND_MEANING: Record<string, string> = {
  core: 'every account has it and it cannot be denied — the caller acting on themselves',
  app: 'grantable per role, at read or write',
  confined: 'grantable, but only to an account that has its own Linux user; without one the grant resolves to nothing',
  execution: 'runs as the server owner in the owner’s home. NEVER grantable, at any level, structurally',
  admin: 'the server owner only',
};

export async function renderPlatformSkill(): Promise<string> {
  const { PERMISSIONS } = await import('../src/servers/permissions/registry');
  const { SHORTCUT_SECTIONS } = await import('../src/apps/officer-web/state/shortcuts');
  const enCatalog = (await import('../src/apps/officer-web/locales/en-GB.json')).default as Record<string, unknown>;
  /** Resolve a dot-path against the English catalog. This doc is for agents and stays in one language. */
  const enString = (key: string): string => {
    const value = key.split('.').reduce<unknown>((node, part) => {
      if (node && typeof node === 'object') return (node as Record<string, unknown>)[part];
      return undefined;
    }, enCatalog);
    if (typeof value !== 'string') throw new Error(`gen-platform-skill: no English string for "${key}"`);
    return value;
  };

  const byKind = new Map<string, typeof PERMISSIONS>();
  for (const p of PERMISSIONS) {
    const list = byKind.get(p.kind) ?? [];
    list.push(p);
    byKind.set(p.kind, list as typeof PERMISSIONS);
  }

  const lines: string[] = [];
  const out = (s = '') => lines.push(s);

  out('---');
  /*
    `name` is an IDENTIFIER, not a label: lowercase-hyphenated and equal to the directory, per both
    harnesses' rules. The human name is `title`.

    This generator emitted `name: Officer platform` and was missed when c24859c fixed every skill by
    hand — so the file on disk was right and running this script put the old shape back. `docs:check`
    then failed on a line count that nobody could fix by regenerating, which is the worst place for a
    drift check to point.
  */
  out('name: platform');
  out('title: Officer platform');
  // The description is the ENTIRE interface: the agent sees only this before deciding to open the body.
  // Vague makes a skill useless rather than merely verbose — see skills/load.ts.
  out('description: >-');
  out('  Use when the user asks what Officer can do, how to use a feature, what an endpoint is, why something is');
  out('  refused, or how permissions and accounts work — "how do I start a commander", "can a member see my files",');
  out('  "what is the API for tasks". Carries the permission registry, every API prefix and socket, the frontend');
  out('  routes and the keyboard shortcuts, derived from the code rather than written by hand.');
  out('version: 1');
  out('---');
  out();
  out('<!--');
  out('  GENERATED by `bun run skills:platform`. Do not edit by hand — `bun run docs:check` fails if this file');
  out('  differs from what the generator produces, and an edit here is lost on the next run.');
  out();
  out('  The prose lives in scripts/gen-platform-skill.ts, beside the generation, so the two cannot separate.');
  out('-->');
  out();
  out('# What Officer is');
  out();
  out('One self-hosted app for one person — the **owner** — that also admits additional accounts holding a');
  out('strict subset of it. The owner is user id 1, role `Super Admin`, and bypasses every permission check.');
  out('Everyone else gets what their ROLE is granted, and nothing else: grants are keyed on role, never on a');
  out('user, and **absence denies** — there is no row meaning "no".');
  out();
  out('So "can this account do X" has three possible answers, and the third is the one people miss: yes,');
  out('no, and *not shareable at all*.');
  out();
  out('# Permissions');
  out();
  out('The authority for this is `src/servers/permissions/registry.ts`. Mounting an API router without an');
  out('entry there makes the server **refuse to boot** — so this list is complete by construction, not by');
  out('diligence.');
  out();
  for (const [kind, meaning] of Object.entries(KIND_MEANING)) {
    const entries = byKind.get(kind) ?? [];
    if (!entries.length) continue;
    out(`## \`${kind}\` — ${meaning}`);
    out();
    for (const p of entries) {
      const bits: string[] = [];
      if (p.api?.length) bits.push(`API \`${p.api.join('`, `')}\``);
      if (p.ws?.length) bits.push(`socket \`${p.ws.join('`, `')}\``);
      if (p.routes?.length) bits.push(`screen \`${p.routes.join('`, `')}\``);
      out(`- **${p.label}** (\`${p.key}\`) — ${p.description}`);
      if (bits.length) out(`  - ${bits.join(' · ')}`);
      if (p.selfService?.length) {
        out(`  - acts on the caller themselves, allowed with no grant: \`${p.selfService.join('`, `')}\``);
      }
      if (p.ownerOnly?.length) out(`  - owner only, even when granted: \`${p.ownerOnly.join('`, `')}\``);
      if (p.readOnlyWrites?.length) {
        out(`  - a POST that is really a read, allowed at read level: \`${p.readOnlyWrites.join('`, `')}\``);
      }
    }
    out();
  }

  out('# Keyboard shortcuts');
  out();
  out('Derived from `src/apps/officer-web/state/shortcuts.ts`. These have moved several times; quote this');
  out('list rather than remembering one.');
  out();
  // The registry holds catalog keys since the shell was localized; this doc is agent-facing and stays
  // English, so it resolves against en-GB rather than the reader's locale.
  for (const section of SHORTCUT_SECTIONS) {
    out(`## ${enString(section.titleKey)}`);
    if (section.noteKey) {
      out();
      out(enString(section.noteKey));
    }
    out();
    for (const s of section.shortcuts) out(`- \`${s.keys}\` — ${enString(s.descriptionKey)}`);
    out();
  }

  out('# What is NOT in here');
  out();
  out('- **Installed plugins.** They vary per machine and per install, so a generated list would be wrong on');
  out('  every other server. Ask the platform: `GET /api/plugins` for what is installed here.');
  out('- **Request and response shapes.** This says which prefix a permission covers, not what a route');
  out('  accepts. Read the router under `src/servers/api/<feature>/` when the shape matters.');
  out('- **Anything about a commander beyond its permission.** That has its own skill — open it for what a');
  out('  commander is, how one is started, and how to help somebody shape one.');
  out();
  out('# When you are about to guess');
  out();
  out('Do not. This file is generated from the registry, so a question it does not answer is a question the');
  out('registry does not answer either — say so, and read the code. Every documented count in this repository');
  out('that was maintained by hand has been wrong, and an agent quoting a stale number sounds exactly as');
  out('certain as one quoting a true one.');

  return `${lines.join('\n')}\n`;
}

if (import.meta.main) {
  const body = await renderPlatformSkill();
  mkdirSync(join(SKILL_PATH, '..'), { recursive: true });
  const existing = existsSync(SKILL_PATH) ? readFileSync(SKILL_PATH, 'utf-8') : null;
  if (existing === body) {
    console.log('skills:platform — already current');
  } else {
    writeFileSync(SKILL_PATH, body);
    console.log(`skills:platform — wrote ${SKILL_PATH} (${body.split('\n').length} lines)`);
  }
}