/**
 * @file skill-plugins.js
 * @description The plugins AgentHub's pipelines depend on: which ones a template
 * names, which of those are actually resolvable, and the narrow set the
 * SessionStart bootstrap is allowed to install on the user's behalf.
 *
 * Shared by `scripts/plugin-doctor.js` (reports) and
 * `scripts/plugin-bootstrap.js` (installs) so the two can never disagree about
 * what is missing. It lives here rather than in either script because
 * plugin-doctor already requires plugin-bootstrap — the other direction would
 * be a cycle.
 *
 * ## Reporting is derived, installing is allowlisted
 * `requiredSkillPlugins()` reads the loaded pipeline templates, including any
 * custom one from `DASHBOARD_PIPELINES_DIR`. That is right for a report: if a
 * template names `/foo:bar`, the reader should be told `foo` is missing.
 *
 * It is NOT right for an install. A template is a file anyone can drop into
 * that directory, so installing whatever plugin name it happens to contain
 * would turn "edit a JSON file" into "run this vendor's plugin install command
 * on the next session" — a supply-chain path AgentHub must not open. Auto-install
 * therefore consults {@link AUTO_INSTALLABLE}, a fixed map in this file, and
 * ignores every requirement outside it.
 *
 * @author Nguyễn Ngọc Trí Vĩ <vinnt@smartgift.vn>
 */

const { spawnSync } = require("node:child_process");
const { getClaudeHome } = require("./claude-home");

/**
 * Plugins the bootstrap may install unattended, keyed by the plugin name a
 * template refers to. `spec` is the exact `claude plugin install` argument;
 * `marketplace` is the `owner/repo` to register first if that spec cannot be
 * resolved because the marketplace is not known on this machine.
 *
 * Adding an entry here is a decision to install someone else's code on a
 * user's machine without asking — it belongs in a review, not in a config file.
 *
 * @type {Record<string, {spec: string, marketplace: string}>}
 */
const AUTO_INSTALLABLE = {
  superpowers: {
    spec: "superpowers@claude-plugins-official",
    marketplace: "anthropics/claude-plugins-official",
  },
};

/** Slash commands are addressed `/plugin:skill`; a bare `/command` has no plugin. */
const SLASH_COMMAND_RE = /^\/([A-Za-z0-9_-]+):([A-Za-z0-9_-]+)/;

/**
 * Every `/plugin:skill` the loaded pipeline templates name — as a pipeline's
 * own `skill` or as one node's `command` — grouped by the plugin that has to
 * provide it. Derived rather than hardcoded so editing a template cannot leave
 * the check behind. `agenthub` is dropped: it is the plugin asking.
 *
 * @returns {Map<string, Set<string>>} plugin name → the skill names it must ship.
 */
function requiredSkillPlugins() {
  const requirements = new Map();
  let pipelines = [];
  try {
    pipelines = require("./pipelines").listPipelines();
  } catch {
    return requirements; // templates unreadable — a different failure, not this one
  }
  for (const pipeline of pipelines) {
    for (const command of [pipeline.skill, ...pipeline.nodes.map((n) => n.command)]) {
      const match = SLASH_COMMAND_RE.exec(command || "");
      if (!match) continue; // a shell command, or a bare /command
      const [, plugin, skill] = match;
      if (plugin === "agenthub") continue;
      if (!requirements.has(plugin)) requirements.set(plugin, new Set());
      requirements.get(plugin).add(skill);
    }
  }
  return requirements;
}

/**
 * Which required plugins cannot be resolved right now.
 *
 * A plugin present but explicitly disabled counts as missing — Claude Code will
 * not resolve its skills either way. A plugin whose skills all exist as plain
 * user skills under `~/.claude/skills/` counts as satisfied: hand-copying them
 * is a legitimate setup, and calling it broken is how a warning teaches its
 * reader to ignore it.
 *
 * @returns {{name: string, skills: string[], autoInstall: {spec: string, marketplace: string}|null}[]}
 *   Empty when everything resolves. `null` autoInstall means report only.
 * @throws When the installed-plugin manifest cannot be read at all.
 */
function missingSkillPlugins() {
  const requirements = requiredSkillPlugins();
  if (!requirements.size) return [];

  const discovery = require("./cc-discovery");
  const installed = discovery.readPlugins().plugins;
  const userSkills = new Set(discovery.readSkills({ scope: "user" }).map((s) => s.name));

  const missing = [];
  for (const [name, skills] of requirements) {
    const present = installed.find(
      (p) => p.name === name && p.installPathExists && p.enabled !== false
    );
    if (present) continue;
    const absent = [...skills].filter((s) => !userSkills.has(s)).sort();
    if (!absent.length) continue;
    missing.push({ name, skills: absent, autoInstall: AUTO_INSTALLABLE[name] || null });
  }
  return missing;
}

/**
 * `claude plugin …`, synchronously. The bootstrap is a synchronous script, so
 * it cannot use the promise-based `cc-plugin-cli.js` the HTTP routes go
 * through; the argument validation that module carries is also moot here,
 * because every argv element below comes from {@link AUTO_INSTALLABLE} — a
 * constant in this file, never a request or a template.
 *
 * Still an argv array, never a shell string, and `CLAUDE_CONFIG_DIR` is pinned
 * to the same home `cc-discovery` reads so a write here is a write the
 * dashboard can see.
 *
 * @returns {{ok: boolean, output: string}}
 */
function runClaudePlugin(args, timeoutMs) {
  const result = spawnSync("claude", args, {
    timeout: timeoutMs,
    encoding: "utf8",
    maxBuffer: 1024 * 1024,
    // Non-interactive: a would-be prompt must fail fast, not hang out the timeout.
    stdio: ["ignore", "pipe", "pipe"],
    env: { ...process.env, CLAUDE_CONFIG_DIR: getClaudeHome() },
  });
  const output = `${result.stdout || ""}${result.stderr || ""}`.trim();
  if (result.error) {
    const enoent = result.error.code === "ENOENT";
    return {
      ok: false,
      output: enoent ? "the `claude` CLI is not on PATH" : String(result.error.message),
    };
  }
  return { ok: result.status === 0, output };
}

/**
 * Install the allowlisted plugins that are missing. Called from the bootstrap's
 * DETACHED worker, so a slow clone never delays a session; its only channel is
 * the caller's log.
 *
 * Best-effort by design: a failure is logged and the run moves on. The
 * dashboard, hooks, CLI and MCP all work without these plugins — only the
 * ship-feature pipelines need them — so nothing here may throw into the
 * bootstrap.
 *
 * @param {(line: string) => void} log
 * @param {{timeoutMs?: number, run?: typeof runClaudePlugin}} [options] `run` is
 *   a seam for tests: nothing else may reach a real `claude plugin install`.
 * @returns {{attempted: string[], installed: string[], failed: string[], skipped: string[]}}
 */
function autoInstallSkillPlugins(log, { timeoutMs = 180_000, run = runClaudePlugin } = {}) {
  const summary = { attempted: [], installed: [], failed: [], skipped: [] };

  let missing = [];
  try {
    missing = missingSkillPlugins();
  } catch {
    return summary; // manifest unreadable — the doctor reports it, this stays quiet
  }

  for (const entry of missing) {
    if (!entry.autoInstall) {
      // Reported by /agenthub-doctor, never installed: not on the allowlist.
      summary.skipped.push(entry.name);
      continue;
    }
    const { spec, marketplace } = entry.autoInstall;
    summary.attempted.push(entry.name);
    log(`installing the ${entry.name} plugin — the pipelines drive ${entry.skills.join(", ")}`);

    let result = run(["plugin", "install", spec, "--scope", "user", "-y"], timeoutMs);
    if (!result.ok) {
      // The most likely cause on a fresh machine is that the marketplace has
      // never been registered, which `install` cannot do for us. Register it
      // and retry exactly once.
      const added = run(
        ["plugin", "marketplace", "add", marketplace, "--scope", "user"],
        timeoutMs
      );
      if (added.ok) {
        result = run(["plugin", "install", spec, "--scope", "user", "-y"], timeoutMs);
      }
    }

    if (result.ok) {
      summary.installed.push(entry.name);
      log(
        `installed ${spec} — run /reload-plugins to use it in THIS session ` +
          `(a new session picks it up on its own)`
      );
    } else {
      summary.failed.push(entry.name);
      log(
        `could not install ${spec}: ${result.output || "unknown error"} — ` +
          `install it yourself with: claude plugin install ${spec}`
      );
    }
  }
  return summary;
}

module.exports = {
  AUTO_INSTALLABLE,
  requiredSkillPlugins,
  missingSkillPlugins,
  autoInstallSkillPlugins,
};