/**
 * @file StatusBar — the one-line bar along the bottom of the app shell, on
 * every page: the live-connection state (click: the connection details modal,
 * which the sidebar owns and which also carries the update check), the version
 * — with a green dot while a newer release is out —, how many SESSIONS are
 * running and how many need the user (`GET /api/sessions?status=active` and
 * `?awaiting=1` — the Dashboard's Needs-you rule —, re-read on session
 * messages), and today's spend — `GET /api/pricing/cost?date=<local date>` — and, on the
 * Workspace page, the open workspace's total (`?lane=` on the same call: the
 * sessions it owns) and the shown session's (`GET /api/pricing/cost/:id` for
 * the URL's `session`, or the focused pane's session from the page's run poll,
 * `LIVE_RUNS_EVENT`), all re-read every 30 s while the tab is visible and
 * whenever the URL names another workspace or session. Each figure carries its
 * token total, and hovering it lists tokens and cost per model. At the right
 * end, the plan quota spent per native tool (`GET /api/pricing/quota`, every
 * 5 min while visible; a click forces a re-read): one "N% used" chip per tool —
 * its fullest window, live account only — and, on hover or focus, a panel
 * above grouping every account per tool (saved Claude profiles too): name,
 * sign-in expiry, and a row per window with its bar, percent and reset time.
 * @author Nguyễn Ngọc Trí Vĩ <vinnt@smartgift.vn>
 */

import { Fragment, useCallback, useEffect, useRef, useState } from "react";
import { createPortal } from "react-dom";
import { useTranslation } from "react-i18next";
import { Link, useLocation } from "react-router-dom";
import { RefreshCw, Wifi, WifiOff } from "lucide-react";
import { api, type RunHandle } from "../lib/api";
import type { BudgetStatus, CostResult, ToolQuota } from "../lib/types";
import { fmt, fmtCostFull, formatModelName, timeAgo } from "../lib/format";
import { AiToolIcon } from "./AiToolIcon";
import { useLiveRefresh } from "../hooks/useLiveRefresh";
import { useSpin } from "../hooks/useSpin";
import { LIVE_RUNS_EVENT, selectedFrom } from "./WorkspaceTree";

const COST_POLL_MS = 30_000;
const QUOTA_POLL_MS = 5 * 60_000;
const QUOTA_TOOL_LABEL: Record<ToolQuota["id"], string> = {
  claude: "Claude",
  codex: "Codex",
  antigravity: "Antigravity",
  cursor: "Cursor",
  grok: "Grok",
  kimi: "Kimi",
  opencode: "OpenCode Go",
};

function localDate(d = new Date()): string {
  const pad = (n: number) => String(n).padStart(2, "0");
  return `${d.getFullYear()}-${pad(d.getMonth() + 1)}-${pad(d.getDate())}`;
}

const usd = (n: number) => `$${n.toFixed(2)}`;

/** Tokens and cost per model (the breakdown's speed/geo/tier buckets folded),
 *  costliest first: the hover text of a cost figure. */
function perModel(r: CostResult): { tokens: number; lines: string } {
  const byModel = new Map<string, { tokens: number; cost: number }>();
  for (const b of r.breakdown) {
    const m = byModel.get(b.model) ?? { tokens: 0, cost: 0 };
    m.tokens += b.input_tokens + b.output_tokens + b.cache_read_tokens + b.cache_write_tokens;
    m.cost += b.cost;
    byModel.set(b.model, m);
  }
  const rows = [...byModel].sort((a, b) => b[1].cost - a[1].cost);
  return {
    tokens: rows.reduce((n, [, m]) => n + m.tokens, 0),
    lines: rows
      .map(([model, m]) => `${formatModelName(model)}: ${fmt(m.tokens)} · ${fmtCostFull(m.cost)}`)
      .join("\n"),
  };
}

function CostFigure({ testId, label, r }: { testId: string; label: string; r: CostResult }) {
  const { t } = useTranslation("nav");
  const { tokens, lines } = perModel(r);
  return (
    <span data-testid={testId} tabIndex={0} title={lines || undefined} className="tabular-nums">
      {label} {t("statusBar.tokens", { tokens: fmt(tokens) })}
    </span>
  );
}

/** Re-run `load` every `ms` and whenever the tab becomes visible again. */
function useVisiblePoll(load: () => void, ms: number, deps: unknown[]) {
  useEffect(() => {
    const tick = () => document.visibilityState === "visible" && load();
    tick();
    const id = setInterval(tick, ms);
    document.addEventListener("visibilitychange", tick);
    return () => {
      clearInterval(id);
      document.removeEventListener("visibilitychange", tick);
    };
    // eslint-disable-next-line react-hooks/exhaustive-deps
  }, deps);
}

const fullest = (q: ToolQuota) => Math.max(0, ...q.windows.map((w) => w.usedPercent ?? 0));
const quotaTone = (p: number) =>
  p >= 90 ? "text-status-danger" : p >= 70 ? "text-status-warning" : "";
const barTone = (p: number) =>
  p >= 90 ? "bg-status-danger" : p >= 70 ? "bg-status-warning" : "bg-fg-muted";

function untilText(iso: string | null): string | null {
  const ms = iso ? Date.parse(iso) - Date.now() : NaN;
  if (!(ms > 0)) return null;
  const m = Math.floor(ms / 60_000);
  const d = Math.floor(m / 1440);
  const h = Math.floor((m % 1440) / 60);
  return d ? `${d}d ${h}h` : h ? `${h}h ${m % 60}m` : `${m}m`;
}

/** "account · sign-in state · as of", whichever parts the entry has. */
function quotaMeta(q: ToolQuota, t: (k: string, o?: Record<string, unknown>) => string) {
  const until = untilText(q.expiresAt ?? null);
  return [
    q.label && q.account,
    q.expiresAt &&
      q.error !== "ELIVEEXPIRED" &&
      (until
        ? t("statusBar.quotaSignInExpires", { time: until })
        : t("statusBar.quotaSignInExpired")),
    q.asOf && t("statusBar.quotaAsOf", { ago: timeAgo(q.asOf) }),
  ]
    .filter(Boolean)
    .join(" · ");
}

const QUOTA_ERROR_KEY: Record<string, string> = {
  ELIVEEXPIRED: "statusBar.quotaExpired",
  EPROFILEEXPIRED: "statusBar.quotaProfileExpired",
  EWRONGACCOUNT: "statusBar.quotaWrongAccount",
  ETOKENEXPIRED: "statusBar.quotaTokenExpired",
};

/** One account: its name, sign-in line, then a row per window with its reset. */
function QuotaAccount({ q, many }: { q: ToolQuota; many: boolean }) {
  const { t } = useTranslation("nav");
  const meta = quotaMeta(q, t);
  return (
    <div data-testid="status-bar-quota-account" className="min-w-0">
      <div className="flex items-center gap-1.5">
        <span className="truncate font-medium">{q.label || q.account}</span>
        {q.plan && (
          <span
            data-testid="status-bar-quota-plan"
            className="shrink-0 rounded bg-surface-4 px-1 text-[10px] capitalize leading-4 text-fg-secondary"
          >
            {q.plan}
          </span>
        )}
        {many && q.active !== false && (
          <span className="shrink-0 rounded bg-accent-solid/15 px-1 text-[10px] leading-4 text-accent">
            {t("statusBar.quotaActive")}
          </span>
        )}
      </div>
      {meta && <div className="truncate text-[10px] text-fg-muted">{meta}</div>}
      {q.error && !q.windows.length ? (
        <div className="text-status-warning">
          {t(QUOTA_ERROR_KEY[q.error] ?? "statusBar.quotaFailed")}
        </div>
      ) : (
        <div className="mt-1 grid grid-cols-[2.75rem_1fr_2.25rem_auto] items-center gap-x-2 gap-y-0.5 tabular-nums">
          {q.windows.map((w, i) => {
            const p = Math.round(w.usedPercent ?? 0);
            const resets = untilText(w.resetsAt);
            return (
              <Fragment key={`${w.group ?? ""}-${w.label}`}>
                {w.group && w.group !== q.windows[i - 1]?.group && (
                  <span className="col-span-4 mt-0.5 truncate text-[10px] text-fg-muted">
                    {w.group}
                  </span>
                )}
                <span className="text-fg-muted">
                  {t(`statusBar.quotaWindow.${w.label}`, { defaultValue: w.label })}
                </span>
                <span className="h-1.5 overflow-hidden rounded-full bg-surface-4">
                  <span
                    className={`block h-full ${barTone(p)}`}
                    style={{ width: `${Math.min(p, 100)}%` }}
                  />
                </span>
                <span className={`text-right ${quotaTone(p)}`}>{p}%</span>
                {/* In words: a ↻ glyph here read as a Refresh button. */}
                <span className="text-right text-fg-muted">
                  {resets && t("statusBar.quotaResets", { time: resets })}
                </span>
              </Fragment>
            );
          })}
        </div>
      )}
    </div>
  );
}

function QuotaPanel({
  tools,
  onEnter,
  onLeave,
  onRefresh,
  refreshing,
}: {
  tools: ToolQuota[];
  /** The footer's Refresh: re-reads the quota, as a click on the chips does. */
  onRefresh: () => void;
  /** A forced read is in flight: the Refresh icon spins. */
  refreshing: boolean;
  /** The pointer moved onto the panel / off it: it stays open while read. */
  onEnter: () => void;
  onLeave: () => void;
}) {
  const { t } = useTranslation("nav");
  const groups = (Object.keys(QUOTA_TOOL_LABEL) as ToolQuota["id"][])
    .map((id) => [id, tools.filter((q) => q.id === id)] as const)
    .filter(([, list]) => list.length);
  return createPortal(
    <div
      role="dialog"
      aria-label={t("statusBar.quotaTitle")}
      data-testid="status-bar-quota-panel"
      onMouseEnter={onEnter}
      onMouseLeave={onLeave}
      onFocus={onEnter}
      onBlur={onLeave}
      className="fixed bottom-7 right-2 z-[9999] max-h-[calc(100vh-2.5rem)] w-[19rem] max-w-[calc(100vw-1rem)] overflow-y-auto rounded-lg border border-border bg-surface-2 px-3 py-2.5 text-[11px] leading-snug text-fg-primary shadow-lg shadow-black/20"
    >
      <div className="mb-2 font-semibold">{t("statusBar.quotaTitle")}</div>
      {groups.map(([id, list]) => (
        <div key={id} className="mb-2 border-b border-border pb-2 last-of-type:border-0">
          <div className="mb-1 flex items-center gap-1.5">
            <AiToolIcon tool={{ id, label: QUOTA_TOOL_LABEL[id] }} className="h-4 w-4 !p-0" />
            <span className="font-semibold">{QUOTA_TOOL_LABEL[id]}</span>
          </div>
          <div className="space-y-2 pl-[1.375rem]">
            {list.map((q, i) => (
              <QuotaAccount
                key={`${q.label ?? q.account ?? ""}-${i}`}
                q={q}
                many={list.length > 1}
              />
            ))}
          </div>
        </div>
      ))}
      <button
        type="button"
        data-testid="status-bar-quota-refresh"
        // Not `disabled`: a focused button that turns disabled loses focus, and
        // that blur would close the panel under the pointer.
        onClick={() => !refreshing && onRefresh()}
        aria-busy={refreshing}
        className={`flex items-center gap-1 text-[10px] text-fg-muted ${
          refreshing ? "cursor-default" : "hover:text-fg-primary"
        }`}
      >
        <RefreshCw className={`h-3 w-3 ${refreshing ? "animate-spin" : ""}`} aria-hidden />
        {t(refreshing ? "statusBar.quotaRefreshing" : "statusBar.quotaRefresh")}
      </button>
    </div>,
    document.body
  );
}

/** The right-end quota chips; nothing at all until a tool reports one. */
function QuotaChips() {
  const { t } = useTranslation("nav");
  const [tools, setTools] = useState<ToolQuota[]>([]);
  const [open, setOpen] = useState(false);
  // Leaving the chips closes the panel only after a beat, and entering the
  // panel cancels that: the pointer crosses the gap to read it.
  const closeTimer = useRef<number>();
  const show = () => {
    window.clearTimeout(closeTimer.current);
    setOpen(true);
  };
  const hide = () => {
    window.clearTimeout(closeTimer.current);
    closeTimer.current = window.setTimeout(() => setOpen(false), 200);
  };
  useEffect(() => () => window.clearTimeout(closeTimer.current), []);
  const load = useCallback(
    (force = false) =>
      api.pricing
        .quota(force)
        .then((r) => setTools(r.tools))
        .catch(() => undefined),
    []
  );
  const [refreshing, refresh] = useSpin(() => load(true));
  useVisiblePoll(load, QUOTA_POLL_MS, [load]);
  if (!tools.length) return null;
  return (
    <>
      <button
        type="button"
        data-testid="status-bar-quota"
        data-tip-off
        onClick={refresh}
        onMouseEnter={show}
        onMouseLeave={hide}
        onFocus={show}
        onBlur={hide}
        className="ml-auto flex items-center gap-3 tabular-nums hover:text-fg-primary"
      >
        {tools
          .filter((q) => q.active !== false)
          .map((q) => {
            const p = Math.round(fullest(q));
            return (
              <span key={q.id} className="flex items-center gap-1">
                <AiToolIcon
                  tool={{ id: q.id, label: QUOTA_TOOL_LABEL[q.id] }}
                  className="h-4 w-4 !p-0"
                />
                <span className="sr-only">{QUOTA_TOOL_LABEL[q.id]}</span>
                {q.error ? (
                  <span className="text-status-warning">!</span>
                ) : (
                  <span className={quotaTone(p)}>{t("statusBar.quotaUsed", { pct: p })}</span>
                )}
              </span>
            );
          })}
      </button>
      {open && (
        <QuotaPanel
          tools={tools}
          onEnter={show}
          onLeave={hide}
          onRefresh={refresh}
          refreshing={refreshing}
        />
      )}
    </>
  );
}

export function StatusBar({
  wsConnected,
  left,
  onConnectionClick,
  updateAvailable = false,
}: {
  wsConnected: boolean;
  /** Sidebar width, so the bar starts where the main column does. */
  left: string;
  onConnectionClick: () => void;
  /** A newer release is out: a dot beside the version. */
  updateAvailable?: boolean;
}) {
  const { t } = useTranslation("nav");
  const [active, setActive] = useState(0);
  const [needYou, setNeedYou] = useState(0);
  const running = Math.max(active - needYou, 0);
  const [today, setToday] = useState<CostResult | null>(null);
  const [laneCost, setLaneCost] = useState<CostResult | null>(null);
  const [sessionCost, setSessionCost] = useState<CostResult | null>(null);
  const [runs, setRuns] = useState<RunHandle[]>([]);
  // The budget furthest past one of its thresholds, if any.
  const [budget, setBudget] = useState<BudgetStatus | null>(null);
  const location = useLocation();
  const shown = selectedFrom(location.pathname, location.search);
  const lane = shown.lane;
  const sessionId =
    shown.session ?? (shown.run && runs.find((r) => r.id === shown.run)?.sessionId) ?? null;

  useEffect(() => {
    const take = (e: Event) => setRuns((e as CustomEvent<RunHandle[]>).detail);
    window.addEventListener(LIVE_RUNS_EVENT, take);
    return () => window.removeEventListener(LIVE_RUNS_EVENT, take);
  }, []);

  const loadCounts = useCallback(() => {
    api.sessions
      .list({ status: "active", limit: 1 })
      .then((r) => setActive(r.total))
      .catch(() => undefined);
    api.sessions
      .list({ awaiting: true, limit: 1 })
      .then((r) => setNeedYou(r.total))
      .catch(() => undefined);
  }, []);
  useEffect(loadCounts, [loadCounts]);
  useLiveRefresh(loadCounts, {
    intervalMs: 15_000,
    match: (msg) => msg.type === "session_updated" || msg.type === "session_created",
  });

  useEffect(() => {
    let live = true;
    // Another workspace or session: never show the previous one's figure.
    setLaneCost(null);
    setSessionCost(null);
    const tick = () => {
      if (document.visibilityState !== "visible") return;
      api.pricing
        .totalCost({ date: localDate() })
        .then((r) => live && setToday(r))
        .catch(() => undefined);
      api.budgets
        .status()
        .then(({ budgets }) => {
          const hit = budgets.filter((b) => b.crossed.length > 0).sort((a, b) => b.pct - a.pct);
          if (live) setBudget(hit[0] ?? null);
        })
        .catch(() => undefined);
      if (lane !== null) {
        api.pricing
          .totalCost({ lane })
          .then((r) => live && setLaneCost(r))
          .catch(() => undefined);
      }
      if (sessionId) {
        api.pricing
          .sessionCost(sessionId)
          .then((r) => live && setSessionCost(r))
          .catch(() => undefined);
      }
    };
    tick();
    const id = setInterval(tick, COST_POLL_MS);
    document.addEventListener("visibilitychange", tick);
    return () => {
      live = false;
      clearInterval(id);
      document.removeEventListener("visibilitychange", tick);
    };
  }, [lane, sessionId]);

  return (
    <footer
      data-testid="status-bar"
      style={{ left }}
      className="fixed bottom-0 right-0 z-20 flex h-6 items-center gap-4 overflow-hidden whitespace-nowrap border-t border-border bg-surface-1 px-3 text-xs text-fg-muted transition-[left] duration-200"
    >
      {/* What a screen reader is told without looking: the connection dropping
          or coming back, and agents waiting on the user. Polite, and nothing
          that ticks on its own (costs, running counts) — those stay silent. */}
      <span role="status" className="sr-only" data-testid="status-bar-live">
        {wsConnected ? t("live") : t("disconnected")}
        {needYou > 0 ? ` · ${t("statusBar.needYou", { count: needYou })}` : ""}
      </span>
      <button
        type="button"
        onClick={onConnectionClick}
        title={t("connectionDetails")}
        className={`flex items-center gap-1.5 hover:text-fg-primary ${
          wsConnected ? "text-status-success" : ""
        }`}
      >
        {wsConnected ? (
          <Wifi className="h-3 w-3" aria-hidden />
        ) : (
          <WifiOff className="h-3 w-3" aria-hidden />
        )}
        {wsConnected ? t("live") : t("disconnected")}
        <span className="text-fg-muted">{`v${__APP_VERSION__}`}</span>
        {updateAvailable && (
          <span
            data-testid="status-bar-update"
            title={t("updateAvailable")}
            className="h-1.5 w-1.5 rounded-full bg-status-success"
          >
            <span className="sr-only">{t("updateAvailable")}</span>
          </span>
        )}
      </button>
      <span data-testid="status-bar-counts">
        {t("statusBar.running", { count: running })}
        {" · "}
        <span className={needYou ? "text-status-warning" : ""}>
          {t("statusBar.needYou", { count: needYou })}
        </span>
      </span>
      {today !== null && (
        <CostFigure
          testId="status-bar-cost"
          label={t("statusBar.today", { cost: usd(today.total_cost) })}
          r={today}
        />
      )}
      {lane !== null && laneCost !== null && (
        <CostFigure
          testId="status-bar-workspace-cost"
          label={t("statusBar.workspace", { cost: usd(laneCost.total_cost) })}
          r={laneCost}
        />
      )}
      {sessionId && sessionCost !== null && (
        <CostFigure
          testId="status-bar-session-cost"
          label={t("statusBar.session", { cost: usd(sessionCost.total_cost) })}
          r={sessionCost}
        />
      )}
      {budget && (
        <Link
          to="/?tab=analytics&sub=cost"
          data-testid="status-bar-budget"
          title={t("statusBar.budgetTitle", {
            name: budget.name,
            spend: usd(budget.spend),
            limit: usd(budget.config.limit_usd ?? 0),
          })}
          className={`tabular-nums hover:underline ${budget.pct >= 100 ? "text-status-danger" : "text-status-warning"}`}
        >
          {t("statusBar.budget", { pct: Math.round(budget.pct) })}
        </Link>
      )}
      <QuotaChips />
    </footer>
  );
}