/**
 * @file accounts.js
 * @description `GET /api/accounts` — the Claude account pool as the balancer
 * sees it (server/lib/claude-pool.js): per account its live panes, $ spent in
 * the last 5 h / 7 d, the last quota reading and whether it counts as full;
 * `codex` is the same for the Codex pool (server/lib/codex-pool.js). Never a
 * key or a token. `?force=1` re-reads every quota first.
 *
 * Accounts are added from the host's shell (`agenthub accounts …`) or, in
 * server mode, by an admin on the Users page: `POST /` (`{tool, name, …}`) and
 * `DELETE /:name` (`{tool}`). A Claude account is one of: `profile` — a login
 * saved by the switch-user profiles (cc-profiles.js), MOVED into the pool (its
 * single-use refresh token may have only one holder, so the profile is
 * deleted; the account the host's own CLI is logged into moves in with its
 * live login and the host's home becomes one more placement the server
 * refreshes); `credentials` — the text of a `.credentials.json` (or a macOS
 * Keychain item's JSON); or `token` — a `claude setup-token` token. A Codex
 * one is an OpenAI API key or the text of an `auth.json` (`token`).
 * `GET /profiles` lists the saved profiles that can be moved in (identity only). Like every Users-page change
 * they need the admin's own password again (`currentPassword`), are audited
 * (the account NAME only), and refuse in local mode. The secret only goes IN:
 * no route answers with it (`/accounts` is in ADMIN_WRITE_PREFIXES).
 * @author Nguyễn Ngọc Trí Vĩ <vinnt@smartgift.vn>
 */

const { Router } = require("express");
const pool = require("../lib/claude-pool");
const codexPool = require("../lib/codex-pool");
const auth = require("../lib/auth");
const { recordAccountChange } = require("../lib/audit");
const profiles = require("../lib/cc-profiles");

const router = Router();

router.get("/", async (req, res) => {
  try {
    await pool.refreshQuotas({ force: req.query.force === "1" });
    if (req.query.force === "1") codexPool.resetQuota();
    res.json({
      accounts: pool.poolStatus(),
      codex: codexPool.poolStatus(),
      blockPercent: pool.BLOCK_PERCENT,
    });
  } catch (e) {
    res.status(500).json({ error: { code: e.code || "EPOOL", message: e.message } });
  }
});

/** Saved switch-user profiles an admin may move into the pool — never a token. */
router.get("/profiles", (_req, res) => {
  try {
    res.json({
      profiles: profiles.listProfiles().items.map((p) => ({
        name: p.name,
        label: p.label,
        email: p.email,
        subscriptionType: p.subscriptionType,
        active: p.active,
      })),
    });
  } catch (e) {
    res.status(500).json({ error: { code: e.code || "EPROFILES", message: e.message } });
  }
});

const STATUS = {
  ENOTFOUND: 404,
  EACTIVE: 409,
  ELOCALMODE: 403,
  EREAUTH: 403,
  EBADTOOL: 400,
  EBADNAME: 400,
  EBADTOKEN: 400,
  ENOACCOUNT: 404,
  EEXISTS: 409,
  ETOOMANY: 429,
  ESTALE: 409, // a pasted login whose refresh token was already spent
  EUPSTREAM: 502,
};

/** One pool change: server mode, the admin's password confirmed, audited. */
function poolChange(handler) {
  return async (req, res) => {
    try {
      if (!auth.isServerMode() || !req.user) {
        throw Object.assign(new Error("the pool is changed from the host's shell in local mode"), {
          code: "ELOCALMODE",
        });
      }
      const body = req.body && typeof req.body === "object" ? req.body : {};
      if (body.tool !== "claude" && body.tool !== "codex") {
        throw Object.assign(new Error("tool: claude or codex"), { code: "EBADTOOL" });
      }
      await auth.confirmPassword(req.user, body.currentPassword);
      const out = await handler(req, body);
      recordAccountChange(req.user.id, null, req.method, out.action);
      res.status(out.status || 200).json(out.json);
    } catch (e) {
      const status = STATUS[e.code];
      if (!status) return res.status(500).json({ error: { message: e.message } });
      res.status(status).json({ error: { code: e.code, message: e.message } });
    }
  };
}

/**
 * A pasted `.credentials.json` (or Keychain item) → `{oauth, account}`. The
 * file names no account, so Anthropic is asked whose token it is (refreshing
 * an expired one first — what the exchange returns is what gets stored):
 * the pool copies a member's refresh back only when it is that same account.
 */
async function pastedLogin(text) {
  let parsed;
  try {
    parsed = JSON.parse(String(text || ""));
  } catch {
    throw Object.assign(new Error("not valid JSON — paste the whole .credentials.json"), {
      code: "EBADTOKEN",
    });
  }
  let oauth = parsed?.claudeAiOauth || parsed;
  if (!oauth?.accessToken || !oauth?.refreshToken) return { oauth }; // addLoginAccount says why
  const usage = require("../lib/cc-usage");
  let owner = await usage.fetchOwner(oauth.accessToken);
  if (!owner) {
    oauth = await usage.exchangeRefresh(oauth);
    owner = await usage.fetchOwner(oauth.accessToken);
  }
  if (!owner) {
    throw Object.assign(new Error("Anthropic did not accept this login"), { code: "EBADTOKEN" });
  }
  return { oauth, account: { accountUuid: owner.uuid, emailAddress: owner.email } };
}

/**
 * Move a saved profile into the pool: the pool becomes its one holder. The
 * account this machine's own Claude Code is logged into moves in with the
 * LIVE login (the saved copy's refresh token is spent once the CLI refreshed)
 * and keeps running here: the host's home becomes one more placement the
 * server refreshes and pushes into. A macOS Keychain login cannot be written
 * that way (EACTIVE).
 */
function fromProfile(name, poolName) {
  const stored = profiles.readProfile(name);
  if (!stored) throw Object.assign(new Error(`no saved profile ${name}`), { code: "ENOTFOUND" });
  const active = profiles.listProfiles().items.find((p) => p.name === name)?.active;
  let oauth = stored.credentials;
  if (active) {
    const live = profiles.readActiveAuth();
    if (live.keychain || !live.oauth) {
      throw Object.assign(
        new Error(
          "this machine's Claude Code keeps that login in the macOS Keychain — switch it to another profile first"
        ),
        { code: "EACTIVE" }
      );
    }
    oauth = live.oauth;
  }
  const account = pool.addLoginAccount(poolName || name, {
    oauth,
    account: stored.account || null,
    userID: stored.userID || null,
    hostHolds: Boolean(active),
  });
  // The only saved copy of the live account is not deletable (EACTIVE) — and
  // need not be: removing the file is enough, the pool holds the login now.
  require("node:fs").rmSync(require("node:path").join(profiles.profilesDir(), `${name}.json`), {
    force: true,
  });
  return account;
}

/** Codex takes an API key, or the text of an auth.json (`codex login`'s). */
function codexSecret(token) {
  const text = String(token || "").trim();
  if (!text.startsWith("{")) return { apiKey: text };
  try {
    return { auth: JSON.parse(text) };
  } catch {
    throw Object.assign(new Error("not valid JSON — paste the whole auth.json"), {
      code: "EBADTOKEN",
    });
  }
}

router.post(
  "/",
  poolChange(async (_req, body) => {
    const account =
      body.tool === "codex"
        ? codexPool.addAccount(body.name, codexSecret(body.token))
        : body.profile
          ? fromProfile(String(body.profile), body.name)
          : body.credentials
            ? pool.addLoginAccount(body.name, await pastedLogin(body.credentials))
            : pool.addAccount(body.name, body.token);
    return {
      status: 201,
      json: { account },
      action: `pool: add ${body.tool} account ${account.name}`,
    };
  })
);

router.delete(
  "/:name",
  poolChange((req, body) => {
    (body.tool === "claude" ? pool : codexPool).removeAccount(req.params.name);
    return {
      json: { ok: true },
      action: `pool: remove ${body.tool} account ${req.params.name}`,
    };
  })
);

module.exports = router;