/**
 * @file cc-target.js
 * @description Whose Claude Code configuration a `/api/cc-config` request reads
 * and writes — the ONE resolver every handler of `routes/cc-config.js` uses,
 * and the allowlist of the endpoints a non-admin may reach there at all.
 *
 * - Local mode, or an admin: the host's Claude home (`getClaudeHome()`), with
 *   every handler behaving exactly as it did before members had a config page.
 * - Server mode, a non-admin with an enabled, provisioned Linux account (S3):
 *   their OWN `<home>/.claude` and `<home>/.claude.json`. Their writes run as
 *   them (cc-mutate's `ioFor`, cc-plugin-cli's sudo), never as the host.
 * - An analyst with no such account, reading: the host's, read-only — what an
 *   analyst read before. `?view=host` gives an analyst WITH an account that
 *   same read-only view.
 * - Anyone else (a developer with no account, any non-admin write without
 *   one): 403 ENOACCOUNT — never "the host's then".
 *
 * Nothing here takes a home or a path from the request.
 * @author Nguyễn Ngọc Trí Vĩ <vinnt@smartgift.vn>
 */

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

/**
 * What a non-admin may call under `/api/cc-config` ("METHOD /path", lower
 * case, HEAD counted as GET): reads of their own config and the writes that
 * run as them. Everything else — `/profiles*` (the host's login switching),
 * `/plugins/update-all` (the host's Update all, AgentHub's own plugin
 * included), and any endpoint added later — stays an admin's until it is
 * listed here.
 */
const MEMBER_ROUTES = new Set([
  "GET /target",
  "GET /overview",
  "GET /skills",
  "GET /agents",
  "GET /commands",
  "GET /output-styles",
  "GET /plugins",
  "GET /plugins/available",
  "GET /mcp",
  "GET /hooks",
  "GET /settings",
  "GET /memory",
  "GET /marketplaces",
  "GET /keybindings",
  "GET /statusline",
  "GET /hook-scripts",
  "GET /file",
  "GET /backups",
  "PUT /keybindings",
  "PUT /file",
  "DELETE /file",
  "PATCH /settings",
  "POST /project-memory",
  "POST /plugins/install",
  "POST /plugins/action",
  "POST /marketplaces/add",
  "POST /marketplaces/action",
  "POST /mcp/add",
  "POST /mcp/remove",
  "POST /reload",
]);

/** The host-wide reads an analyst had before (staff read everything): still read-only. */
const ANALYST_READS = new Set(["GET /profiles", "GET /plugins/update-all"]);

/** `"METHOD /path"` as the allowlists spell it (decoded, lower case, no trailing slash). */
function routeKey(req) {
  const p = require("./auth").apiPath(req).toLowerCase().replace(/\/+$/, "") || "/";
  const method = req.method === "HEAD" ? "GET" : String(req.method || "").toUpperCase();
  return `${method} ${p}`;
}

/** Whether `req.user` may reach this cc-config endpoint at all (local mode and admins: yes). */
function mayReach(req) {
  const u = req.user;
  if (!u || u.role === "admin") return true;
  const key = routeKey(req);
  return MEMBER_ROUTES.has(key) || (u.role === "analyst" && ANALYST_READS.has(key));
}

/** Express middleware: the router's own gate (403 EADMIN), the single rule for `/cc-config`. */
function ccGate(req, res, next) {
  if (mayReach(req)) return next();
  res.status(403).json({ error: { code: "EADMIN", message: "only an admin may open this" } });
}

const isRead = (req) => req.method === "GET" || req.method === "HEAD";

function host(readOnly = false) {
  return {
    acct: null,
    own: false,
    readOnly,
    home: getClaudeHome(),
    claudeJson: require("./cc-discovery").getClaudeJsonPath(),
  };
}

/**
 * The target of `req`: `{acct, own, readOnly, home, claudeJson}` — `acct` and
 * `own` set for a member's own config.
 * @throws ENOACCOUNT (status 403) for a non-admin with no account to act on
 */
function resolveCcTarget(req) {
  const u = req.user;
  if (!u || u.role === "admin") return host();
  if (u.role === "analyst" && isRead(req) && req.query?.view === "host") return host(true);
  let acct = null;
  try {
    acct = require("./run-as").accountForUser(u.username);
  } catch {
    acct = null; // a disabled / unprovisioned account is no account: refuse below
  }
  if (acct) {
    return {
      acct,
      own: true,
      readOnly: false,
      home: path.join(acct.home, ".claude"),
      claudeJson: path.join(acct.home, ".claude.json"),
    };
  }
  if (u.role === "analyst" && isRead(req)) return host(true);
  throw Object.assign(
    new Error(
      "your Claude Code config lives in your own account, and this server has none for you yet"
    ),
    { code: "ENOACCOUNT", status: 403 }
  );
}

module.exports = { resolveCcTarget, ccGate, mayReach, routeKey, MEMBER_ROUTES, ANALYST_READS };