/**
 * @file AccountPoolCard.tsx
 * @description The Users page's account pool card (`GET /api/accounts`): the
 * Claude and Codex accounts every user's new sessions are spread over, each
 * with its live panes, $ and tokens in the last 5 h / 7 d and quota — so nobody signs in
 * per user. An admin adds one — for Claude a login MOVED in from a saved
 * profile (Settings → AI tools → Profiles, `GET /api/accounts/profiles`), a
 * pasted `.credentials.json`, or a `claude setup-token` token; for Codex a
 * saved Codex profile (`?tool=codex`), an OpenAI API key or a pasted
 * `auth.json` — or removes one, each time with their own
 * password again; an analyst only reads. The secret only goes IN: the server
 * never sends it back. An account's Edit (pencil) picks the users who run on
 * it (`PUT /api/accounts/:name/users`): their sessions skip the balancer, and
 * a Claude login goes into their home at once — no restart. A profile's
 * "Move to pool" link lands here as `?poolAdd=<tool>&poolProfile=<name>`,
 * which opens Add on that profile; the header links back to the profiles.
 * @author Nguyễn Ngọc Trí Vĩ <vinnt@smartgift.vn>
 */

import { useCallback, useEffect, useState, type KeyboardEvent, type ReactNode } from "react";
import { useTranslation } from "react-i18next";
import type { TFunction } from "i18next";
import { Link, useSearchParams } from "react-router-dom";
import { KeyRound, Pencil, Plus, RefreshCw, Trash2 } from "lucide-react";
import {
  api,
  type AccountPin,
  type AccountPool,
  type PoolAccountInput,
  type PoolProfile,
  type PoolTool,
  type ServerUserUsage,
} from "../../lib/api";
import { fmt, fmtCost, formatDateTime } from "../../lib/format";
import { toast } from "../../lib/toast";
import { isSubmitEnter } from "../../lib/keys";
import { useSpin } from "../../hooks/useSpin";
import { ConfirmModal } from "../ConfirmModal";
import { Checkbox } from "../Checkbox";

type Row = {
  tool: PoolTool;
  name: string;
  kind: string;
  email: string | null;
  refreshError: string | null;
  addedAt: string;
  expired: boolean;
  livePanes: number;
  spend5h: number;
  spend7d: number;
  tokens5h: number;
  tokens7d: number;
  quotaPercent: number | null;
  full: boolean;
};

function rowsOf(pool: AccountPool): Row[] {
  return [
    ...pool.accounts.map((a) => ({ ...a, tool: "claude" as const })),
    ...pool.codex.map((a) => ({
      ...a,
      tool: "codex" as const,
      expired: false,
      email: null,
      refreshError: null,
    })),
  ];
}

const pinsOf = (pool: AccountPool, tool: PoolTool): AccountPin[] => pool.pins?.[tool] ?? [];

function errorText(t: TFunction<"users">, e: unknown): string {
  const err = e as Error & { code?: string };
  return err.code && t(`pool.errors.${err.code}`, { defaultValue: "" })
    ? t(`pool.errors.${err.code}`)
    : err.message;
}

export function AccountPoolCard({ isAdmin }: { isAdmin: boolean }) {
  const { t } = useTranslation("users");
  const [pool, setPool] = useState<AccountPool | null>(null);
  const [error, setError] = useState<string | null>(null);
  const [params, setParams] = useSearchParams();
  // A profile's "Move to pool" (Settings → AI tools → Profiles) lands here.
  const preset = (() => {
    const tool = params.get("poolAdd");
    const profile = params.get("poolProfile");
    return (tool === "claude" || tool === "codex") && profile ? { tool, profile } : null;
  })() as { tool: PoolTool; profile: string } | null;
  const [adding, setAdding] = useState(() => isAdmin && preset !== null);
  const closeAdd = () => {
    setAdding(false);
    if (!preset) return;
    const next = new URLSearchParams(params);
    next.delete("poolAdd");
    next.delete("poolProfile");
    setParams(next, { replace: true });
  };
  const [removing, setRemoving] = useState<Row | null>(null);
  const [editing, setEditing] = useState<Row | null>(null);

  const load = useCallback(
    (force = false) =>
      api.accountPool
        .list(force)
        .then((r) => {
          setPool(r);
          setError(null);
        })
        .catch((e: Error) => setError(e.message)),
    []
  );
  const [spinning, refresh] = useSpin(() => load(true));

  useEffect(() => {
    void load();
  }, [load]);

  const rows = pool ? rowsOf(pool) : [];
  const th = "px-5 py-2.5 text-[11px] font-semibold text-fg-muted uppercase tracking-wider";

  return (
    <section id="account-pool" className="card scroll-mt-24" data-testid="account-pool">
      <div className="flex flex-wrap items-center gap-2 px-5 py-4 border-b border-border">
        <KeyRound className="w-4 h-4 text-fg-muted" />
        <div className="flex-1 min-w-0">
          <h2 className="text-sm font-semibold text-fg-primary">{t("pool.title")}</h2>
          <p className="text-xs text-fg-muted">{t("pool.description")}</p>
        </div>
        <Link to="/settings/agents#tool-profiles" className="btn-ghost text-xs">
          {t("pool.profilesLink")}
        </Link>
        <button
          type="button"
          onClick={refresh}
          disabled={spinning}
          aria-busy={spinning}
          title={t("pool.refresh")}
          aria-label={t("pool.refresh")}
          className="btn-icon"
        >
          <RefreshCw className={`w-4 h-4 ${spinning ? "animate-spin" : ""}`} />
        </button>
        {isAdmin && (
          <button type="button" onClick={() => setAdding(true)} className="btn-primary">
            <Plus className="w-4 h-4" /> {t("pool.add")}
          </button>
        )}
      </div>
      {error && (
        <p role="alert" className="px-5 py-3 text-xs text-status-danger">
          {error}
        </p>
      )}
      {pool && rows.length === 0 && (
        <p className="px-5 py-8 text-center text-sm text-fg-muted">{t("pool.empty")}</p>
      )}
      {rows.length > 0 && (
        <div className="overflow-x-auto">
          <table className="w-full min-w-[640px]">
            <thead>
              <tr className="border-b border-border text-left">
                <th className={th}>{t("pool.account")}</th>
                <th className={th}>{t("pool.tool")}</th>
                <th className={`${th} text-right`}>{t("pool.livePanes")}</th>
                <th className={`${th} text-right`}>{t("pool.quota")}</th>
                <th className={`${th} text-right`}>{t("pool.spend")}</th>
                {isAdmin && <th className={`${th} text-right`}>{t("actions")}</th>}
              </tr>
            </thead>
            <tbody className="divide-y divide-border">
              {rows.map((r) => (
                <tr key={`${r.tool}:${r.name}`} className={r.expired ? "opacity-60" : ""}>
                  <td className="px-5 py-2.5">
                    <div className="text-sm font-medium text-fg-primary">{r.name}</div>
                    {r.email && <div className="text-[11px] text-fg-secondary">{r.email}</div>}
                    <div className="text-[11px] text-fg-muted">
                      {t("pool.added", { at: formatDateTime(r.addedAt) })}
                    </div>
                    {pool && pinsOf(pool, r.tool).some((p) => p.account === r.name) && (
                      <div className="text-[11px] text-fg-secondary">
                        {t("pool.pinned", {
                          users: pinsOf(pool, r.tool)
                            .filter((p) => p.account === r.name)
                            .map((p) => p.username)
                            .join(", "),
                        })}
                      </div>
                    )}
                  </td>
                  <td className="px-5 py-2.5 text-sm text-fg-secondary">
                    {t(`pool.kind.${r.kind}`)}
                    {r.expired && (
                      <span className="badge ml-1.5 py-0 text-[10px] bg-status-danger/10 text-status-danger border-status-danger/20">
                        {t("pool.expired")}
                      </span>
                    )}
                    {r.refreshError && !r.expired && (
                      <span
                        className="badge ml-1.5 py-0 text-[10px] bg-status-warning/10 text-status-warning border-status-warning/20"
                        title={r.refreshError}
                      >
                        {t("pool.refreshFailed")}
                      </span>
                    )}
                    {r.full && (
                      <span className="badge ml-1.5 py-0 text-[10px] bg-status-warning/10 text-status-warning border-status-warning/20">
                        {t("pool.full")}
                      </span>
                    )}
                  </td>
                  <td className="px-5 py-2.5 text-right text-sm tabular-nums text-fg-secondary">
                    {r.livePanes}
                  </td>
                  <td className="px-5 py-2.5 text-right text-sm tabular-nums text-fg-secondary">
                    {r.quotaPercent == null ? "—" : `${Math.round(r.quotaPercent)}%`}
                  </td>
                  <td className="px-5 py-2.5 text-right tabular-nums">
                    <div className="text-sm text-fg-primary">
                      {fmtCost(r.spend5h)}
                      <span className="ml-1.5 text-[11px] text-fg-muted">
                        {t("pool.tokens", { tokens: fmt(r.tokens5h) })}
                      </span>
                    </div>
                    <div className="text-[11px] text-fg-muted">
                      {t("pool.spend7d", { cost: fmtCost(r.spend7d), tokens: fmt(r.tokens7d) })}
                    </div>
                  </td>
                  {isAdmin && (
                    <td className="px-5 py-2 text-right whitespace-nowrap">
                      <button
                        type="button"
                        onClick={() => setEditing(r)}
                        title={t("pool.edit", { name: r.name })}
                        aria-label={t("pool.edit", { name: r.name })}
                        className="btn-icon"
                      >
                        <Pencil className="h-4 w-4" />
                      </button>
                      <button
                        type="button"
                        onClick={() => setRemoving(r)}
                        title={t("pool.remove", { name: r.name })}
                        aria-label={t("pool.remove", { name: r.name })}
                        className="btn-icon"
                      >
                        <Trash2 className="h-4 w-4" />
                      </button>
                    </td>
                  )}
                </tr>
              ))}
            </tbody>
          </table>
        </div>
      )}
      {adding && (
        <AddAccountDialog
          preset={preset}
          onClose={closeAdd}
          onDone={(name) => {
            toast.success(t("pool.done.added", { name }));
            closeAdd();
            void load();
          }}
        />
      )}
      {removing && (
        <RemoveAccountDialog
          row={removing}
          onClose={() => setRemoving(null)}
          onDone={() => {
            toast.success(t("pool.done.removed", { name: removing.name }));
            setRemoving(null);
            void load();
          }}
        />
      )}
      {editing && pool && (
        <EditAccountDialog
          pool={pool}
          row={editing}
          onClose={() => setEditing(null)}
          onDone={(r) => {
            const left = r.added.filter(
              (u) => u.switched === "own-login" || u.switched === "expired"
            );
            toast.success(t("pool.editDone", { name: editing.name }));
            for (const u of left) {
              toast.info(
                t(`pool.pinDone.${u.switched}`, { user: u.username, account: editing.name })
              );
            }
            setEditing(null);
            void load();
          }}
        />
      )}
    </section>
  );
}

/**
 * One account's Edit: tick the users whose sessions run on it. A user already
 * on another account of the tool moves here when ticked; unticking one sends
 * them back to the least-used account. Saved in one request, password again.
 */
function EditAccountDialog({
  pool,
  row,
  onClose,
  onDone,
}: {
  pool: AccountPool;
  row: Row;
  onClose: () => void;
  onDone: (r: Awaited<ReturnType<typeof api.accountPool.setUsers>>) => void;
}) {
  const { t } = useTranslation("users");
  const pins = pinsOf(pool, row.tool);
  const initial = pins.filter((p) => p.account === row.name).map((p) => p.userId);
  const [users, setUsers] = useState<ServerUserUsage[] | null>(null);
  const [chosen, setChosen] = useState<Set<number>>(() => new Set(initial));
  const [current, setCurrent] = useState("");
  const [busy, setBusy] = useState(false);
  const [error, setError] = useState<string | null>(null);

  useEffect(() => {
    api.users
      .list()
      .then((r) => setUsers(r.users))
      .catch(() => setUsers([]));
  }, []);

  const changed = chosen.size !== initial.length || initial.some((id) => !chosen.has(id));
  const ready = changed && current.length > 0;
  const toggle = (id: number, on: boolean) =>
    setChosen((prev) => {
      const next = new Set(prev);
      if (on) next.add(id);
      else next.delete(id);
      return next;
    });

  const submit = async () => {
    if (!ready || busy) return;
    setBusy(true);
    setError(null);
    try {
      onDone(await api.accountPool.setUsers(row.tool, row.name, [...chosen], current));
    } catch (e) {
      setError(errorText(t, e));
    } finally {
      setBusy(false);
    }
  };

  return (
    <ConfirmModal
      open
      title={t("pool.edit", { name: row.name })}
      message={t("pool.editHint")}
      confirmLabel={t("pool.save")}
      cancelLabel={t("common:cancel")}
      destructive={false}
      busy={busy}
      disabled={!ready}
      onConfirm={() => void submit()}
      onCancel={onClose}
    >
      <div
        className="mt-3 space-y-3"
        onKeyDown={(e) => {
          if ((e.target as HTMLElement).tagName === "INPUT" && isSubmitEnter(e)) {
            e.preventDefault();
            void submit();
          }
        }}
      >
        <div>
          <span className="text-xs font-medium text-fg-secondary">{t("pool.users")}</span>
          <div className="mt-1 max-h-56 overflow-y-auto rounded-md border border-border divide-y divide-border">
            {users === null && (
              <p className="px-3 py-2 text-xs text-fg-muted">{t("pool.loadingUsers")}</p>
            )}
            {users?.length === 0 && (
              <p className="px-3 py-2 text-xs text-fg-muted">{t("pool.noUsers")}</p>
            )}
            {users?.map((u) => {
              const elsewhere = pins.find((p) => p.userId === u.id && p.account !== row.name);
              return (
                <div key={u.id} className="px-3 py-2">
                  <Checkbox
                    checked={chosen.has(u.id)}
                    onChange={(on) => toggle(u.id, on)}
                    label={
                      <span>
                        {u.username}
                        {u.disabled && (
                          <span className="ml-1 text-fg-muted">({t("disabled")})</span>
                        )}
                        {elsewhere && (
                          <span className="ml-1.5 text-[11px] text-fg-muted">
                            {t("pool.onAccount", { account: elsewhere.account })}
                          </span>
                        )}
                      </span>
                    }
                    labelClassName="text-sm text-fg-primary"
                  />
                </div>
              );
            })}
          </div>
        </div>
        <Field label={t("yourPassword")} hint={t("yourPasswordHint")}>
          <input
            type="password"
            className="input w-full text-sm"
            value={current}
            onChange={(e) => setCurrent(e.target.value)}
            autoComplete="current-password"
            aria-label={t("yourPassword")}
          />
        </Field>
        {error && (
          <p role="alert" className="text-xs text-status-danger">
            {error}
          </p>
        )}
      </div>
    </ConfirmModal>
  );
}

type ClaudeSource = "profile" | "credentials" | "token";
/** What each tool's pool account can come from (server/routes/accounts.js). */
const SOURCES: Record<PoolTool, ClaudeSource[]> = {
  claude: ["profile", "credentials", "token"],
  codex: ["profile", "token"],
};

function AddAccountDialog({
  preset,
  onClose,
  onDone,
}: {
  /** A saved profile to move in, from its "Move to pool" link. */
  preset?: { tool: PoolTool; profile: string } | null;
  onClose: () => void;
  onDone: (name: string) => void;
}) {
  const { t } = useTranslation("users");
  const [tool, setTool] = useState<PoolTool>(preset?.tool ?? "claude");
  const [source, setSource] = useState<ClaudeSource>("profile");
  const [profiles, setProfiles] = useState<PoolProfile[] | null>(null);
  const [profile, setProfile] = useState(preset?.profile ?? "");
  const [name, setName] = useState("");
  const [secret, setSecret] = useState("");
  const [current, setCurrent] = useState("");
  const [busy, setBusy] = useState(false);
  const [error, setError] = useState<string | null>(null);

  useEffect(() => {
    setProfiles(null);
    api.accountPool
      .profiles(tool)
      .then((r) => setProfiles(r.profiles))
      .catch(() => setProfiles([]));
  }, [tool]);

  const fromProfile = source === "profile";
  // A profile already names itself: its name is the default.
  const ready =
    current.length > 0 &&
    (fromProfile ? profile.length > 0 : name.trim().length > 0 && secret.trim().length > 0);

  const submit = async () => {
    if (!ready || busy) return;
    setBusy(true);
    setError(null);
    const body: PoolAccountInput =
      source === "profile"
        ? { tool, name: name.trim() || profile, profile }
        : tool === "codex"
          ? { tool, name: name.trim(), token: secret.trim() }
          : source === "credentials"
            ? { tool, name: name.trim(), credentials: secret.trim() }
            : { tool, name: name.trim(), token: secret.trim() };
    try {
      const r = await api.accountPool.add(body, current);
      onDone(r.account.name);
    } catch (e) {
      setError(errorText(t, e));
    } finally {
      setBusy(false);
    }
  };
  const onKeyDown = (e: KeyboardEvent) => {
    // The secret box is a textarea for pasted JSON: Enter there is a newline.
    if ((e.target as HTMLElement).tagName !== "TEXTAREA" && isSubmitEnter(e)) {
      e.preventDefault();
      void submit();
    }
  };
  const secretKind = tool === "codex" ? "codex" : source;

  return (
    <ConfirmModal
      open
      title={t("pool.add")}
      confirmLabel={t("pool.add")}
      cancelLabel={t("common:cancel")}
      destructive={false}
      busy={busy}
      disabled={!ready}
      onConfirm={() => void submit()}
      onCancel={onClose}
    >
      <div className="mt-3 space-y-3" onKeyDown={onKeyDown}>
        <Field label={t("pool.tool")}>
          <select
            className="input w-full text-sm"
            value={tool}
            onChange={(e) => {
              setTool(e.target.value as PoolTool);
              setProfile("");
              setSource("profile");
            }}
            aria-label={t("pool.tool")}
          >
            <option value="claude">Claude Code</option>
            <option value="codex">Codex</option>
          </select>
        </Field>
        <Field
          label={t("pool.source")}
          hint={t(`pool.sourceHint.${tool === "codex" && source === "token" ? "codex" : source}`)}
        >
          <select
            className="input w-full text-sm"
            value={source}
            onChange={(e) => setSource(e.target.value as ClaudeSource)}
            aria-label={t("pool.source")}
          >
            {SOURCES[tool].map((s) => (
              <option key={s} value={s}>
                {tool === "codex" && s === "token"
                  ? t("pool.secret.codex")
                  : t(`pool.sources.${s}`)}
              </option>
            ))}
          </select>
        </Field>
        {fromProfile && (
          <Field label={t("pool.profile")} hint={t("pool.profileHint")}>
            <select
              className="input w-full text-sm"
              value={profile}
              onChange={(e) => setProfile(e.target.value)}
              aria-label={t("pool.profile")}
            >
              <option value="">
                {profiles === null
                  ? t("pool.loadingProfiles")
                  : profiles.length === 0
                    ? t("pool.noProfiles")
                    : t("pool.chooseProfile")}
              </option>
              {profiles?.map((p) => (
                <option key={p.name} value={p.name}>
                  {p.label}
                  {p.email ? ` — ${p.email}` : ""}
                  {p.active ? ` (${t("pool.activeHere")})` : ""}
                </option>
              ))}
            </select>
          </Field>
        )}
        <Field
          label={t("pool.name")}
          hint={fromProfile ? t("pool.nameFromProfile") : t("pool.nameHint")}
        >
          <input
            className="input w-full text-sm"
            value={name}
            onChange={(e) => setName(e.target.value)}
            autoComplete="off"
            aria-label={t("pool.name")}
          />
        </Field>
        {!fromProfile && (
          <Field label={t(`pool.secret.${secretKind}`)} hint={t(`pool.secretHint.${secretKind}`)}>
            {secretKind === "token" ? (
              <input
                type="password"
                className="input w-full font-mono text-sm"
                value={secret}
                onChange={(e) => setSecret(e.target.value)}
                autoComplete="off"
                aria-label={t(`pool.secret.${secretKind}`)}
              />
            ) : (
              <textarea
                className="input w-full h-24 font-mono text-xs"
                value={secret}
                onChange={(e) => setSecret(e.target.value)}
                autoComplete="off"
                spellCheck={false}
                aria-label={t(`pool.secret.${secretKind}`)}
              />
            )}
          </Field>
        )}
        <Field label={t("yourPassword")} hint={t("yourPasswordHint")}>
          <input
            type="password"
            className="input w-full text-sm"
            value={current}
            onChange={(e) => setCurrent(e.target.value)}
            autoComplete="current-password"
            aria-label={t("yourPassword")}
          />
        </Field>
        {error && (
          <p role="alert" className="text-xs text-status-danger">
            {error}
          </p>
        )}
      </div>
    </ConfirmModal>
  );
}

function RemoveAccountDialog({
  row,
  onClose,
  onDone,
}: {
  row: Row;
  onClose: () => void;
  onDone: () => void;
}) {
  const { t } = useTranslation("users");
  const [current, setCurrent] = useState("");
  const [busy, setBusy] = useState(false);
  const [error, setError] = useState<string | null>(null);

  const submit = async () => {
    if (!current || busy) return;
    setBusy(true);
    setError(null);
    try {
      await api.accountPool.remove(row.tool, row.name, current);
      onDone();
    } catch (e) {
      setError(errorText(t, e));
    } finally {
      setBusy(false);
    }
  };

  return (
    <ConfirmModal
      open
      title={t("pool.remove", { name: row.name })}
      message={t("pool.removeHint")}
      confirmLabel={t("pool.removeButton")}
      cancelLabel={t("common:cancel")}
      busy={busy}
      disabled={!current}
      onConfirm={() => void submit()}
      onCancel={onClose}
    >
      <div
        className="mt-3 space-y-3"
        onKeyDown={(e) => {
          if (isSubmitEnter(e)) {
            e.preventDefault();
            void submit();
          }
        }}
      >
        <Field label={t("yourPassword")} hint={t("yourPasswordHint")}>
          <input
            type="password"
            className="input w-full text-sm"
            value={current}
            onChange={(e) => setCurrent(e.target.value)}
            autoComplete="current-password"
            aria-label={t("yourPassword")}
          />
        </Field>
        {error && (
          <p role="alert" className="text-xs text-status-danger">
            {error}
          </p>
        )}
      </div>
    </ConfirmModal>
  );
}

function Field({ label, hint, children }: { label: string; hint?: string; children: ReactNode }) {
  return (
    <label className="block">
      <span className="text-xs font-medium text-fg-secondary">{label}</span>
      <div className="mt-1">{children}</div>
      {hint && <span className="mt-0.5 block text-[11px] text-fg-muted">{hint}</span>}
    </label>
  );
}