/**
 * @file PoolAccountSettings — Settings → AI tools → Pool account: in server
 * mode, every user picks which account of the shared account pool their own
 * new sessions run on, per tool, among the accounts their pool group may use
 * (`GET/PUT /api/me/pool-accounts`, server/lib/account-pins.js `setChoice`).
 * "Automatic" leaves it to the balancer; an admin's pin locks the choice. A
 * Claude login goes into the user's home at once, so running panes follow it;
 * Codex and Cursor take it at the next session. Renders nothing in local mode
 * or when the pool holds no account the user may use.
 * @author Nguyễn Ngọc Trí Vĩ <vinnt@smartgift.vn>
 */

import { useEffect, useState } from "react";
import { useTranslation } from "react-i18next";
import { Lock } from "lucide-react";
import { api, type MyPoolTool, type PoolTool } from "../../lib/api";
import { toast } from "../../lib/toast";
import { usePermissions } from "../AuthGate";
import { AiToolIcon } from "../AiToolIcon";
import { SettingsRow, SettingsSection } from "./SettingsRow";

const LABEL: Record<PoolTool, string> = { claude: "Claude Code", codex: "Codex", cursor: "Cursor" };

export function PoolAccountSettings() {
  const { t } = useTranslation("settings");
  const { local } = usePermissions();
  const [tools, setTools] = useState<MyPoolTool[] | null>(null);
  const [busy, setBusy] = useState<PoolTool | null>(null);

  useEffect(() => {
    if (local) return;
    api.me
      .poolAccounts()
      .then((r) => setTools(r.tools))
      .catch(() => setTools(null));
  }, [local]);

  if (local || !tools?.length) return null;

  const choose = async (tool: PoolTool, account: string | null) => {
    setBusy(tool);
    try {
      const r = await api.me.choosePoolAccount(tool, account);
      setTools((list) =>
        (list ?? []).map((x) => (x.tool === tool ? { ...x, choice: r.choice } : x))
      );
      toast.success(
        !r.choice
          ? t("poolAccount.automaticSaved")
          : r.switched === "switched" || r.switched === "kept"
            ? t("poolAccount.switchedNow", { account: r.choice })
            : t("poolAccount.nextSession", { account: r.choice })
      );
    } catch (err) {
      toast.error(err);
    } finally {
      setBusy(null);
    }
  };

  return (
    <SettingsSection
      id="pool-account"
      title={t("poolAccount.title")}
      description={t("poolAccount.description")}
    >
      {tools.map((x) => (
        <SettingsRow
          key={x.tool}
          id={`pool-account-${x.tool}`}
          label={
            <span className="inline-flex items-center gap-1.5">
              <AiToolIcon tool={{ id: x.tool, label: LABEL[x.tool] }} className="h-4 w-4" />
              {LABEL[x.tool]}
            </span>
          }
          description={
            x.pin ? (
              <span className="inline-flex items-center gap-1">
                <Lock className="h-3 w-3" />
                {t("poolAccount.pinned", { account: x.pin })}
              </span>
            ) : (
              t("poolAccount.count", { count: x.accounts.length })
            )
          }
          disabled={!!x.pin}
          control={
            <select
              aria-label={t("poolAccount.select", { tool: LABEL[x.tool] })}
              value={x.pin ?? x.choice ?? ""}
              disabled={!!x.pin || busy === x.tool}
              onChange={(e) => void choose(x.tool, e.target.value || null)}
              className="select !py-1 !text-xs max-w-[16rem]"
            >
              {!x.pin && <option value="">{t("poolAccount.automatic")}</option>}
              {x.accounts.map((a) => (
                <option key={a.name} value={a.name} disabled={a.expired && a.name !== x.choice}>
                  {[
                    a.name,
                    a.email && a.email !== a.name ? `(${a.email})` : null,
                    a.expired
                      ? `— ${t("poolAccount.expired")}`
                      : a.full
                        ? `— ${t("poolAccount.full")}`
                        : a.quotaPercent != null
                          ? `— ${Math.round(a.quotaPercent)}%`
                          : null,
                  ]
                    .filter(Boolean)
                    .join(" ")}
                </option>
              ))}
            </select>
          }
        />
      ))}
    </SettingsSection>
  );
}