/**
 * @file quota.js
 * @description How much of each native AI tool's plan quota is spent, for the
 * status bar's quota chips (`GET /api/pricing/quota`).
 *
 *  - **Claude**: the logged-in account's `GET /api/oauth/usage` (`cc-usage.js`),
 *    with the access token the CLI holds RIGHT NOW. It is never refreshed here —
 *    a refresh rotates the CLI's credentials — so an expired token answers
 *    `ELIVEEXPIRED` until Claude Code next refreshes it itself. Every OTHER
 *    saved auth profile (`cc-profiles.js`) is asked with its own stored token
 *    while that token is valid and never refreshed (a refresh rotates the
 *    saved credentials); past expiry it shows its last figure, `asOf`. Cached
 *    `CLAUDE_TTL_MS` per account, so a poll from every open tab is one
 *    upstream call each. The live entry is `active: true`. Each token's owner
 *    is asked too (`fetchOwner`): the live row is named after the account its
 *    token belongs to (`.claude.json` can name another), and a saved profile
 *    whose token belongs to a different account answers `EWRONGACCOUNT`,
 *    never that account's usage.
 *  - **Codex**: no network. Every `token_count` event Codex writes into its
 *    rollout journal carries the account's `rate_limits`; the newest one wins.
 *  - **Cursor**: the Cursor CLI's (`cursor-agent`) own login —
 *    `$XDG_CONFIG_HOME/cursor/auth.json` — sent ONLY to cursor.com's
 *    `GET /api/usage-summary` (undocumented; what cursor.com/dashboard reads),
 *    as the `WorkosCursorSessionToken=<user id>::<token>` cookie it expects,
 *    while the token is valid and never refreshed. One `mo` window: the
 *    billing cycle's `totalPercentUsed`. No file (macOS keeps it in the
 *    keychain) means no row.
 *  - **Antigravity**: `agy --print /usage --output-format json` — the CLI's
 *    own `/usage` command (no model call: `num_turns` 0, no conversation),
 *    run by the catalog-detected binary in a private empty directory, only
 *    when the tool is enabled and `agy --version` is at least 1.1.11 (an
 *    older agy may bill `/usage` as a model request). One window per pool
 *    bucket, `group` naming the pool (Gemini / Claude and GPT). Its report
 *    names no account and no plan. Cached like Claude; a failed run shows
 *    the last figure with its `asOf`. Running agy may let it update itself;
 *    `AGENTHUB_AGY_USAGE=0` never runs it.
 *  - **Grok Build**: the CLI's `auth.x.ai` session in `$GROK_HOME/auth.json`
 *    (default `~/.grok`), sent only to `cli-chat-proxy.grok.com`'s
 *    `GET /v1/billing?format=credits`: `wk` from `creditUsagePercent`, `mo`
 *    from `used / monthlyLimit`, plan `subscriptionTier`.
 *  - **Kimi Code**: `$KIMI_CODE_HOME/credentials/kimi-code.json` (default
 *    `~/.kimi-code`), sent only to `api.kimi.com`'s `GET /coding/v1/usages`:
 *    `5h`, `wk`, `mo` from `limit_5h`/`limit_7d`/`limit_month_total`.
 *  - **OpenCode Go**: opencode's own `opencode-go` API key — its `auth.json`
 *    (OpenCode 1) else its `opencode.db` `credential` table (OpenCode 2),
 *    under `$XDG_DATA_HOME/opencode` (default `~/.local/share`) — sent only to
 *    `opencode.ai`'s `GET /zen/go/v1/usage`: `5h`, `wk`, `mo` meters. No Go
 *    key (another provider's login) means no row.
 *  Grok's and Kimi's tokens are used only while valid and never refreshed
 *  (Kimi rotates its refresh token: a refresh here would sign the CLI out).
 *  These three are Orca's readers (github.com/stablyai/orca, MIT), trimmed.
 *
 * Each tool also carries its signed-in `account` (an email), its `plan` (the
 * subscription's name as the tool reports it: Claude's `subscriptionType`,
 * Codex's `chatgpt_plan_type` claim, Cursor's `membershipType`) and
 * `expiresAt`, when its stored access token runs out — Claude's
 * `claudeAiOauth.expiresAt`, Codex's and Cursor's access-token `exp` (claims
 * read, never verified).
 *
 * Server mode with S3 (`quotas({home})`): a member's plan is read from THEIR
 * Linux account's home only — `.claude`, `.codex`, `.config/cursor` +
 * `.cursor`, `.grok`, `.kimi-code`, `.local/share/opencode`, never the
 * host's env overrides — through `run-as`'s owner-checked reads (F3). No
 * saved Claude profiles (the Profiles modal is the host's) and no agy: its
 * `/usage` needs the self-updating binary, so it stays host-only.
 *
 * Only percentages, window lengths, reset/expiry times, the plan's name and
 * the account's email leave this module — never a token.
 * @author Nguyễn Ngọc Trí Vĩ <vinnt@smartgift.vn>
 */

const fs = require("node:fs");
const os = require("node:os");
const path = require("node:path");
const { execFile } = require("node:child_process");
const { promisify } = require("node:util");
const aiTools = require("./ai-tools");
const { getCodexHome } = require("./codex-home");
const { readActiveAuth, readProfile, listProfiles } = require("./cc-profiles");
const { fetchUsage, fetchOwner } = require("./cc-usage");
const { allRolloutFiles } = require("./codex-ingest");
const { getCursorDir } = require("./cursor-usage");
const { Database } = require("../db");
const { readFileSafe, openSafe, ownerForRead } = require("./run-as");
const { s3Enabled } = require("./linux-accounts");

const CLAUDE_TTL_MS = 5 * 60_000;
const FORCE_MIN_MS = 30_000; // a Refresh click still cannot hammer the endpoint
const EXPIRY_MARGIN_MS = 60_000;
const TAIL_BYTES = 512 * 1024;
const CODEX_FILES = 5;
const CURSOR_USAGE_URL = "https://cursor.com/api/usage-summary";
const TIMEOUT_MS = 10_000;
const GROK_BILLING_URL = "https://cli-chat-proxy.grok.com/v1/billing?format=credits";
const KIMI_USAGE_URL = "https://api.kimi.com/coding/v1/usages";
const OPENCODE_GO_URL = "https://opencode.ai/zen/go/v1/usage";
const AGY_TIMEOUT_MS = 60_000;
const AGY_MIN_VERSION = [1, 1, 11];
const AGY_WINDOW = { "5h": "5h", weekly: "wk" };

const execFileAsync = promisify(execFile);

const cache = new Map(); // "live" | "profile:<name>" → { at, value }
const lastGood = new Map(); // profile name → { windows, at }

/** One upstream call per key per `CLAUDE_TTL_MS` (`FORCE_MIN_MS` on a click);
 *  a call still in flight is shared, so two open tabs never run it twice. */
async function cached(key, force, fn) {
  const hit = cache.get(key);
  const age = hit ? Date.now() - hit.at : Infinity;
  if (age < (force ? FORCE_MIN_MS : CLAUDE_TTL_MS)) return hit.value;
  const value = fn();
  cache.set(key, { at: Date.now(), value });
  return value;
}

function windowLabel(minutes) {
  if (minutes === 300) return "5h";
  if (minutes === 10080) return "wk";
  if (minutes >= 40000 && minutes <= 45000) return "mo";
  return minutes % 1440 === 0 ? `${minutes / 1440}d` : `${Math.round(minutes / 60)}h`;
}

const iso = (ms) => (Number(ms) ? new Date(Number(ms)).toISOString() : null);
const fresh = (ms) => Number(ms) > Date.now() + EXPIRY_MARGIN_MS;

function pct(w) {
  return { usedPercent: w.utilization, resetsAt: w.resetsAt };
}

function claudeWindows(u) {
  const windows = [];
  if (u.fiveHour) windows.push({ label: "5h", ...pct(u.fiveHour) });
  if (u.sevenDay) windows.push({ label: "wk", ...pct(u.sevenDay) });
  return windows;
}

/** A token's windows — unless it belongs to another account than `uuid`. */
async function usageFor(token, uuid) {
  const [usage, owner] = await Promise.all([fetchUsage(token), fetchOwner(token)]);
  if (uuid && owner && owner.uuid !== uuid) {
    throw Object.assign(new Error("this sign-in belongs to another account"), {
      code: "EWRONGACCOUNT",
    });
  }
  return claudeWindows(usage);
}

/** A member's Claude login: `<home>/.claude/.credentials.json` + `.claude.json`. */
function memberClaudeAuth(home) {
  const creds = readJson(path.join(home, ".claude", ".credentials.json"));
  const cfg = [path.join(home, ".claude.json"), path.join(home, ".claude", ".claude.json")]
    .map(readJson)
    .find((c) => c?.oauthAccount);
  return { oauth: creds?.claudeAiOauth || null, account: cfg?.oauthAccount || null };
}

/** The account the CLI is logged into, with the token it holds right now. */
async function liveClaude(readAuth = readActiveAuth) {
  let who = {};
  try {
    const { oauth, account } = readAuth();
    if (!oauth || !oauth.accessToken) return null; // API-key user or not logged in
    who = {
      account: account?.emailAddress || account?.displayName || null,
      plan: oauth.subscriptionType || null,
      expiresAt: iso(oauth.expiresAt),
    };
    if (!fresh(oauth.expiresAt)) return { ...who, windows: [], error: "ELIVEEXPIRED" };
    // The token's owner, not `.claude.json`, is who this usage is billed to.
    const [usage, owner] = await Promise.all([
      fetchUsage(oauth.accessToken),
      fetchOwner(oauth.accessToken),
    ]);
    return {
      ...who,
      account: owner?.email || who.account,
      ownerUuid: owner?.uuid || account?.accountUuid || null,
      windows: claudeWindows(usage),
    };
  } catch (e) {
    return { ...who, windows: [], error: e.code || "EUPSTREAM" };
  }
}

/**
 * A saved profile that is not the live account, asked with its OWN stored
 * token only while that token is still valid. Never refreshed here: a refresh
 * rotates the profile's credentials on disk, so it happens only on the
 * Profiles modal's Check quota click (`cc-usage.profileUsage`). Past expiry
 * the last figure this process read is shown with its `asOf`.
 */
async function profileClaude(item) {
  const who = {
    account: item.email || item.displayName || null,
    plan: item.subscriptionType || null,
    expiresAt: iso(item.expiresAt),
  };
  let creds = null;
  try {
    creds = readProfile(item.name)?.credentials || null;
  } catch {
    /* a corrupt profile file reads as signed out */
  }
  if (creds?.accessToken && fresh(creds.expiresAt)) {
    try {
      const windows = await usageFor(creds.accessToken, item.accountUuid);
      lastGood.set(item.name, { windows, at: Date.now() });
      return { ...who, windows };
    } catch (e) {
      return { ...who, windows: [], error: e.code || "EUPSTREAM" };
    }
  }
  const prev = lastGood.get(item.name);
  if (!prev) return { ...who, windows: [], error: "EPROFILEEXPIRED" };
  return { ...who, windows: prev.windows.map(expireReset), asOf: iso(prev.at) };
}

/** A window whose reset has passed is empty again. */
function expireReset(w) {
  return w.resetsAt && Date.parse(w.resetsAt) < Date.now() ? { ...w, usedPercent: 0 } : w;
}

/** The live account first, then every other saved profile (by label). */
async function claudeQuotas(force, home) {
  if (home) {
    const live = await cached(`${home}|live`, force, () =>
      liveClaude(() => memberClaudeAuth(home))
    );
    if (!live) return [];
    const { ownerUuid: _uuid, ...shown } = live;
    return [{ id: "claude", active: true, label: null, ...shown }];
  }
  let items = [];
  try {
    items = listProfiles().items;
  } catch {
    /* no profiles dir */
  }
  const live = await cached("live", force, liveClaude);
  // The live row is the profile of whoever the token belongs to.
  const mine = live?.ownerUuid
    ? items.find((it) => it.accountUuid === live.ownerUuid)
    : items.find((it) => it.active);
  const others = await Promise.all(
    items
      .filter((it) => it !== mine)
      .map(async (it) => ({
        id: "claude",
        active: false,
        label: it.label,
        ...(await cached(`profile:${it.name}`, force, () => profileClaude(it))),
      }))
  );
  if (!live) return others;
  const { ownerUuid: _uuid, ...shown } = live;
  return [{ id: "claude", active: true, label: mine?.label || null, ...shown }, ...others];
}

/** The newest `rate_limits` in the last `TAIL_BYTES` of a rollout, or null. */
function lastRateLimits(file) {
  let text;
  try {
    const fd = openSafe(file.path);
    try {
      const len = Math.min(file.size, TAIL_BYTES);
      const buf = Buffer.alloc(len);
      fs.readSync(fd, buf, 0, len, file.size - len);
      text = buf.toString("utf8");
    } finally {
      fs.closeSync(fd);
    }
  } catch {
    return null;
  }
  const lines = text.split("\n");
  for (let i = lines.length - 1; i >= 0; i--) {
    if (!lines[i].includes('"rate_limits"')) continue;
    try {
      const rl = JSON.parse(lines[i])?.payload?.rate_limits;
      if (rl && (rl.primary || rl.secondary)) return { rl, mtime: file.mtime };
    } catch {
      /* a cut first line or a partial write */
    }
  }
  return null;
}

function codexWindow(w, mtime) {
  if (!w || typeof w.used_percent !== "number") return null;
  const resetsMs = Number(w.resets_at)
    ? Number(w.resets_at) * 1000
    : Number(w.resets_in_seconds)
      ? mtime + Number(w.resets_in_seconds) * 1000
      : null;
  // A window that has reset since Codex last wrote is empty again.
  const used = resetsMs && resetsMs < Date.now() ? 0 : w.used_percent;
  return {
    label: windowLabel(Number(w.window_minutes)),
    usedPercent: used,
    resetsAt: resetsMs ? new Date(resetsMs).toISOString() : null,
  };
}

/** A JWT's claims, unverified — only for showing who is signed in. */
function jwtClaims(token) {
  return JSON.parse(Buffer.from(String(token).split(".")[1], "base64url").toString("utf8"));
}

/** Codex's ChatGPT login from `auth.json`: email, plan + access-token expiry. */
function codexAccount(codexHome = getCodexHome()) {
  try {
    const { tokens } = JSON.parse(readFileSafe(path.join(codexHome, "auth.json"), "utf8", { max: 1 << 20 }));
    const { exp } = jwtClaims(tokens.access_token);
    const id = jwtClaims(tokens.id_token);
    return {
      account: id.email || null,
      plan: id["https://api.openai.com/auth"]?.chatgpt_plan_type || null,
      expiresAt: exp ? new Date(exp * 1000).toISOString() : null,
    };
  } catch {
    return {}; // API-key login, no file, or a token that is not a JWT
  }
}

function codexQuota(codexHome = getCodexHome()) {
  const files = allRolloutFiles(codexHome)
    .sort((a, b) => b.mtime - a.mtime)
    .slice(0, CODEX_FILES);
  for (const f of files) {
    const found = lastRateLimits(f);
    if (!found) continue;
    const windows = [found.rl.primary, found.rl.secondary]
      .map((w) => codexWindow(w, found.mtime))
      .filter(Boolean);
    return {
      id: "codex",
      active: true,
      ...codexAccount(codexHome),
      windows,
      asOf: new Date(found.mtime).toISOString(),
    };
  }
  return null;
}

/** A JSON file, or null; a member's only if it is theirs (`readFileSafe`). */
function readJson(file) {
  try {
    return JSON.parse(readFileSafe(file, "utf8", { max: 1 << 20 }));
  } catch {
    return null;
  }
}

/**
 * Where each tool keeps its login: the host's (env overrides honoured), or a
 * member's home at the tools' defaults — a member's env is not the host's.
 */
function toolDirs(home) {
  const h = home || os.homedir();
  const env = (k) => (home ? null : process.env[k]);
  return {
    codex: home ? path.join(home, ".codex") : getCodexHome(),
    cursorConfig: path.join(env("XDG_CONFIG_HOME") || path.join(h, ".config"), "cursor"),
    cursor: home ? path.join(home, ".cursor") : getCursorDir(),
    grok: env("GROK_HOME") || path.join(h, ".grok"),
    kimi: env("KIMI_CODE_HOME") || path.join(h, ".kimi-code"),
    opencode: path.join(env("XDG_DATA_HOME") || path.join(h, ".local", "share"), "opencode"),
  };
}

/** The Cursor CLI's login and the account's plan + billing-cycle usage. */
async function cursorQuota(dirs = toolDirs()) {
  const token = readJson(path.join(dirs.cursorConfig, "auth.json"))?.accessToken;
  if (typeof token !== "string" || !token) return null; // not logged in
  let claims = {};
  try {
    claims = jwtClaims(token);
  } catch {
    /* not a JWT: no expiry to check, cursor.com decides */
  }
  const info = readJson(path.join(dirs.cursor, "cli-config.json"))?.authInfo || {};
  const who = {
    id: "cursor",
    active: true,
    account: info.email || null,
    plan: null,
    expiresAt: claims.exp ? new Date(claims.exp * 1000).toISOString() : null,
  };
  if (claims.exp && !fresh(claims.exp * 1000))
    return { ...who, windows: [], error: "ETOKENEXPIRED" };
  // The cookie names the user as the dashboard does: `user_…`, no `auth0|`.
  const user = String(info.authId || info.userId || claims.sub || "")
    .split("|")
    .pop();
  try {
    const res = await fetch(CURSOR_USAGE_URL, {
      headers: { Accept: "application/json", Cookie: `WorkosCursorSessionToken=${user}::${token}` },
      signal: AbortSignal.timeout(TIMEOUT_MS),
    });
    if (!res.ok) {
      return { ...who, windows: [], error: res.status === 401 ? "ETOKENEXPIRED" : "EUPSTREAM" };
    }
    const u = await res.json();
    const p = u?.individualUsage?.plan;
    // Enterprise seats answer without `plan`: the plan name, no figure.
    const used = typeof p?.totalPercentUsed === "number" ? p.totalPercentUsed : null;
    return {
      ...who,
      plan: u?.membershipType || null,
      windows:
        used === null
          ? []
          : [{ label: "mo", usedPercent: used, resetsAt: u.billingCycleEnd || null }],
    };
  } catch {
    return { ...who, windows: [], error: "EUPSTREAM" };
  }
}

/** `agy --version` at least `AGY_MIN_VERSION`. */
function agyVersionOk(text) {
  const m = /(\d+)\.(\d+)\.(\d+)/.exec(text);
  if (!m) return false;
  for (let i = 0; i < 3; i++) {
    const d = Number(m[i + 1]) - AGY_MIN_VERSION[i];
    if (d) return d > 0;
  }
  return true;
}

/** `/usage`'s pools → windows: 5h before the week, in the pools' order. */
function agyWindows(report) {
  const windows = [];
  for (const g of report?.command?.data?.groups || []) {
    const rows = (g.buckets || [])
      .filter((b) => AGY_WINDOW[b.window] && typeof b.remaining_fraction === "number")
      .map((b) => {
        const resets = Date.parse(b.reset_time);
        return {
          group: String(g.name || ""),
          label: AGY_WINDOW[b.window],
          // A window past its reset is full again, as Codex's is.
          usedPercent: resets < Date.now() ? 0 : (1 - b.remaining_fraction) * 100,
          resetsAt: Number.isFinite(resets) ? new Date(resets).toISOString() : null,
        };
      });
    rows.sort((a, b) => (a.label === "5h" ? -1 : 0) - (b.label === "5h" ? -1 : 0));
    windows.push(...rows);
  }
  return windows;
}

async function antigravityQuota() {
  if (process.env.AGENTHUB_AGY_USAGE === "0" || !aiTools.isEnabled("antigravity")) return null;
  const { installed, path: bin } = aiTools.detect("antigravity");
  if (!installed || !bin) return null;
  const run = (args, cwd) =>
    execFileAsync(bin, args, { cwd, timeout: AGY_TIMEOUT_MS, maxBuffer: 1024 * 1024 });
  const dir = fs.mkdtempSync(path.join(os.tmpdir(), "agenthub-agy-usage-"));
  try {
    if (!agyVersionOk((await run(["--version"], dir)).stdout)) return null;
    const { stdout } = await run(["--print", "/usage", "--output-format", "json"], dir);
    const windows = agyWindows(JSON.parse(stdout));
    if (!windows.length) throw new Error("no quota in /usage");
    lastGood.set("antigravity", { windows, at: Date.now() });
    return { id: "antigravity", active: true, windows };
  } catch {
    const prev = lastGood.get("antigravity");
    if (!prev) return { id: "antigravity", active: true, windows: [], error: "EUPSTREAM" };
    return {
      id: "antigravity",
      active: true,
      windows: prev.windows.map(expireReset),
      asOf: iso(prev.at),
    };
  } finally {
    fs.rmSync(dir, { recursive: true, force: true });
  }
}

const isoOf = (v) => {
  const ms = Date.parse(v);
  return Number.isFinite(ms) ? new Date(ms).toISOString() : null;
};

/** A Bearer GET to a tool's own host: its windows, or the row's error. */
async function bearerWindows(who, url, token, headers, toWindows) {
  try {
    const res = await fetch(url, {
      headers: { Accept: "application/json", Authorization: `Bearer ${token}`, ...headers },
      signal: AbortSignal.timeout(TIMEOUT_MS),
    });
    if (!res.ok) {
      const expired = res.status === 401 || res.status === 403;
      return { ...who, windows: [], error: expired ? "ETOKENEXPIRED" : "EUPSTREAM" };
    }
    return { ...who, ...toWindows(await res.json()) };
  } catch {
    return { ...who, windows: [], error: "EUPSTREAM" };
  }
}

/** Grok Build's `auth.x.ai` session and its billing view. */
async function grokQuota(dirs = toolDirs()) {
  const sessions = readJson(path.join(dirs.grok, "auth.json"));
  if (!sessions || typeof sessions !== "object") return null;
  const xai = Object.entries(sessions)
    .filter(([issuer, s]) => /^https:\/\/auth\.x\.ai(::|$)/.test(issuer) && s?.key)
    .map(([, s]) => s);
  const live = (s) => !s.expires_at || fresh(Date.parse(s.expires_at));
  const s = xai.find(live) || xai[0];
  if (!s) return null;
  const who = {
    id: "grok",
    active: true,
    account: s.email || null,
    plan: null,
    expiresAt: s.expires_at ? isoOf(s.expires_at) : null,
  };
  if (!live(s)) return { ...who, windows: [], error: "ETOKENEXPIRED" };
  const headers = {
    "X-XAI-Token-Auth": "xai-grok-cli",
    ...(s.user_id && { "x-userid": String(s.user_id) }),
  };
  return bearerWindows(who, GROK_BILLING_URL, s.key, headers, (body) => {
    const c = body?.config || body || {};
    const windows = [];
    // ponytail: a reply with no percent shows no week; Orca infers 0 from
    // the period fields — add that if a real account ever answers so.
    if (typeof c.creditUsagePercent === "number") {
      windows.push({
        label: "wk",
        usedPercent: c.creditUsagePercent,
        resetsAt: isoOf(c.currentPeriod?.end ?? c.billingPeriodEnd),
      });
    }
    const limit = Number(c.monthlyLimit?.val);
    const used = Number(c.used?.val);
    if (limit > 0 && Number.isFinite(used)) {
      windows.push({
        label: "mo",
        usedPercent: (used / limit) * 100,
        resetsAt: isoOf(c.billingPeriodEnd),
      });
    }
    return { plan: c.subscriptionTier || null, windows };
  });
}

/** Kimi Code's OAuth token and its managed-plan usage. */
async function kimiQuota(dirs = toolDirs()) {
  const cred = readJson(path.join(dirs.kimi, "credentials", "kimi-code.json"));
  if (typeof cred?.access_token !== "string" || !cred.access_token) return null;
  const exp = Number(cred.expires_at) * 1000;
  const who = { id: "kimi", active: true, expiresAt: exp ? iso(exp) : null };
  if (exp && !fresh(exp)) return { ...who, windows: [], error: "ETOKENEXPIRED" };
  return bearerWindows(who, KIMI_USAGE_URL, cred.access_token, {}, (body) => ({
    windows: [
      ["5h", body?.usages?.limit_5h],
      ["wk", body?.usages?.limit_7d],
      ["mo", body?.usages?.limit_month_total],
    ]
      .filter(([, u]) => u && Number.isFinite(Number(u.used_ratio)))
      .map(([label, u]) => ({
        label,
        usedPercent: Number(u.used_ratio) * 100,
        resetsAt: isoOf(u.reset_time),
      })),
  }));
}

/**
 * A member's `opencode.db`, copied (with its WAL) from owner-checked reads
 * into a private temp dir — SQLite opens by NAME, which the member could swap
 * between a check and the open. The host's own is opened in place.
 */
function openCodeDbPath(dir, tmp) {
  const db = path.join(dir, "opencode.db");
  if (!s3Enabled() || !ownerForRead(db)) return db;
  const copy = path.join(tmp(), "opencode.db");
  fs.writeFileSync(copy, readFileSafe(db, null, { max: 256 << 20 })); // ponytail: whole file in memory, capped
  try {
    fs.writeFileSync(`${copy}-wal`, readFileSafe(`${db}-wal`, null, { max: 256 << 20 }));
  } catch {
    /* no WAL: everything is in the main file */
  }
  return copy;
}

/** opencode's `opencode-go` key: `auth.json` (v1), else `opencode.db` (v2). */
function openCodeGoKey(dirs = toolDirs()) {
  const dir = dirs.opencode;
  const entry = readJson(path.join(dir, "auth.json"))?.["opencode-go"];
  if (entry?.type === "api" && typeof entry.key === "string" && entry.key) return entry.key;
  let conn;
  let tmpDir = null;
  const tmp = () => (tmpDir = fs.mkdtempSync(path.join(os.tmpdir(), "agenthub-opencode-")));
  try {
    const file = openCodeDbPath(dir, tmp);
    // The private copy is writable so SQLite can replay its WAL.
    conn = new Database(file, { readonly: !tmpDir, fileMustExist: true });
    const rows = conn
      .prepare(
        "SELECT value FROM credential WHERE integration_id = 'opencode-go' ORDER BY active DESC, time_created DESC LIMIT 8"
      )
      .all();
    for (const r of rows) {
      const v = JSON.parse(r.value);
      if (typeof v?.key === "string" && v.key) return v.key;
    }
  } catch {
    /* no OpenCode 2 database, or no credential table (OpenCode 1) */
  } finally {
    conn?.close();
    if (tmpDir) fs.rmSync(tmpDir, { recursive: true, force: true });
  }
  return null;
}

async function openCodeGoQuota(dirs = toolDirs()) {
  const key = openCodeGoKey(dirs);
  if (!key) return null;
  const who = { id: "opencode", active: true, plan: "Go" };
  return bearerWindows(who, OPENCODE_GO_URL, key, {}, (body) => ({
    windows: [
      ["5h", body?.usage?.rolling],
      ["wk", body?.usage?.weekly],
      ["mo", body?.usage?.monthly],
    ]
      .filter(([, m]) => typeof m?.percent === "number")
      .map(([label, m]) => ({ label, usedPercent: m.percent, resetsAt: isoOf(m.resetsAt) })),
  }));
}

/**
 * Every tool's quota row. `home`: a member's Linux home (S3) — that account's
 * logins only, and no agy; omitted, the host's.
 */
async function quotas({ force = false, home = null } = {}) {
  const dirs = toolDirs(home);
  const key = (k) => (home ? `${home}|${k}` : k);
  const [claude, cursor, antigravity, grok, kimi, opencode] = await Promise.all([
    claudeQuotas(force, home),
    cached(key("cursor"), force, () => cursorQuota(dirs)),
    home ? null : cached("antigravity", force, antigravityQuota),
    cached(key("grok"), force, () => grokQuota(dirs)),
    cached(key("kimi"), force, () => kimiQuota(dirs)),
    cached(key("opencode"), force, () => openCodeGoQuota(dirs)),
  ]);
  const tools = [
    ...claude,
    codexQuota(dirs.codex),
    antigravity,
    cursor,
    grok,
    kimi,
    opencode,
  ].filter(Boolean);
  return { tools, checkedAt: new Date().toISOString() };
}

function __resetCache() {
  cache.clear();
  lastGood.clear();
}

module.exports = {
  quotas,
  codexWindow,
  lastRateLimits,
  codexAccount,
  windowLabel,
  agyVersionOk,
  __resetCache,
};