"use client";

import { useState, useEffect, useCallback, useRef, useMemo } from "react";
import ProviderIcon from "@/shared/components/ProviderIcon";
import QuotaTable from "./QuotaTable";
import Toggle from "@/shared/components/Toggle";
import { parseQuotaData, calculatePercentage } from "./utils";
import Card from "@/shared/components/Card";
import { EditConnectionModal } from "@/shared/components";
import { USAGE_SUPPORTED_PROVIDERS } from "@/shared/constants/providers";

function getConnectionLabel(connection) {
  const isEmail = (value) =>
    typeof value === "string" && /^[^\s@]+@[^\s@]+\.[^\s@]+$/.test(value);
  if (isEmail(connection.email)) return connection.email;
  if (isEmail(connection.name)) return connection.name;
  return connection.name;
}

function getConnectionQuotaRemaining(connection, quotaData) {
  const quota = quotaData[connection.id]?.quotas?.[0];
  if (!quota) return Number.POSITIVE_INFINITY;
  if (typeof quota.remaining === "number") return quota.remaining;
  return Number.POSITIVE_INFINITY;
}

function sortVisibleConnections(
  connections,
  quotaData,
  expiringFirst,
  providerFilter,
  quotaSortMode,
) {
  if (providerFilter === "codex" && quotaSortMode !== "default") {
    return [...connections].sort((a, b) => {
      const remainingA = getConnectionQuotaRemaining(a, quotaData);
      const remainingB = getConnectionQuotaRemaining(b, quotaData);
      const remainingDiff =
        quotaSortMode === "remaining-asc"
          ? remainingA - remainingB
          : remainingB - remainingA;

      if (remainingDiff !== 0) return remainingDiff;
      return (getConnectionLabel(a) || "").localeCompare(
        getConnectionLabel(b) || "",
      );
    });
  }

  if (!expiringFirst) return connections;

  const getEarliestResetTime = (connection) => {
    const resetTimes = (quotaData[connection.id]?.quotas || [])
      .map((quota) =>
        quota.resetAt
          ? new Date(quota.resetAt).getTime()
          : Number.POSITIVE_INFINITY,
      )
      .filter((time) => Number.isFinite(time));
    return resetTimes.length > 0
      ? Math.min(...resetTimes)
      : Number.POSITIVE_INFINITY;
  };

  return [...connections].sort((a, b) => {
    const expiryDiff = getEarliestResetTime(a) - getEarliestResetTime(b);
    if (expiryDiff !== 0) return expiryDiff;
    return (
      (a.provider || "").localeCompare(b.provider || "") ||
      (getConnectionLabel(a) || "").localeCompare(getConnectionLabel(b) || "")
    );
  });
}

function buildLoadingState(connections) {
  const nextLoadingState = {};
  connections.forEach((connection) => {
    nextLoadingState[connection.id] = true;
  });
  return nextLoadingState;
}

function filterQuotaStateByConnections(state, connections) {
  const visibleIds = new Set(connections.map((connection) => connection.id));
  return Object.fromEntries(
    Object.entries(state).filter(([id]) => visibleIds.has(id)),
  );
}

function getConnectionsPageRange(pagination) {
  if (!pagination.total) {
    return { start: 0, end: 0 };
  }

  const start = (pagination.page - 1) * pagination.pageSize + 1;
  const end = Math.min(pagination.page * pagination.pageSize, pagination.total);
  return { start, end };
}

function getConnectionsEmptyMessage(totals, providerFilter, accountFilter) {
  if (!totals.eligibleConnections) {
    return {
      icon: "cloud_off",
      title: "No Providers Connected",
      description:
        "Connect to providers with OAuth to track your API quota limits and usage.",
    };
  }

  if (!totals.providerFilteredConnections) {
    return {
      icon: "filter_alt_off",
      title: "No Accounts Match Current Filters",
      description:
        providerFilter === "all"
          ? "Try changing the account status filter to see more quota trackers."
          : `No ${accountFilter === "inactive" ? "turned off" : accountFilter === "active" ? "active" : "matching"} accounts found for ${providerFilter}.`,
    };
  }

  return {
    icon: "filter_alt_off",
    title: "No Accounts On This Page",
    description:
      "Try moving to another page or refreshing the current filters.",
  };
}

function sortRequestFromExpiringFirst(expiringFirst) {
  return expiringFirst ? "expiring" : "priority";
}

function getPageSizeLabel(pageSize, isCustomPageSize) {
  return isCustomPageSize ? `Custom: ${pageSize} / page` : `${pageSize} / page`;
}

function getConnectionsPaginationSummary(pagination) {
  const { start, end } = getConnectionsPageRange(pagination);
  return `Showing ${start}-${end} of ${pagination.total}`;
}

function getSafePagination(pagination, fallbackPageSize) {
  return (
    pagination || {
      page: 1,
      pageSize: fallbackPageSize,
      total: 0,
      totalPages: 1,
    }
  );
}

function getSafeTotals(totals, fallbackTotal = 0) {
  return (
    totals || {
      eligibleConnections: fallbackTotal,
      providerFilteredConnections: fallbackTotal,
    }
  );
}

function shouldResetPage(previousValue, nextValue) {
  return previousValue !== nextValue;
}

function getPaginationPageValue(dataPagination, fallbackPage) {
  return dataPagination?.page || fallbackPage;
}

function getProviderOptions(dataProviderOptions) {
  return dataProviderOptions || [];
}

async function reconcileConnectionsPage(fetchConnections, targetPage) {
  const nextConnections = await fetchConnections(targetPage);
  return nextConnections;
}

const QUOTA_CACHE_KEY = "quotaCacheData";

function getQuotaCache() {
  if (typeof window === "undefined") return {};
  try {
    const cached = window.localStorage.getItem(QUOTA_CACHE_KEY);
    return cached ? JSON.parse(cached) : {};
  } catch (error) {
    console.error("Error reading quota cache:", error);
    return {};
  }
}

function setQuotaCache(connectionId, quotaEntry) {
  if (typeof window === "undefined") return;
  try {
    const cache = getQuotaCache();
    cache[connectionId] = {
      ...quotaEntry,
      cachedAt: new Date().toISOString(),
    };
    window.localStorage.setItem(QUOTA_CACHE_KEY, JSON.stringify(cache));
  } catch (error) {
    console.error("Error writing quota cache:", error);
  }
}

const REFRESH_INTERVAL_MS = 60000; // 60 seconds
const DEPLETED_QUOTA_THRESHOLD = 5; // percent
const AUTO_REFRESH_STORAGE_KEY = "quotaAutoRefresh";
const ACCOUNT_FILTER_OPTIONS = [
  { value: "all", label: "All accounts" },
  { value: "active", label: "Active" },
  { value: "inactive", label: "Turned off" },
];
const QUOTA_SORT_OPTIONS = [
  { value: "default", label: "Default quota order" },
  { value: "remaining-asc", label: "% quota: low to high" },
  { value: "remaining-desc", label: "% quota: high to low" },
];
const CONNECTIONS_PAGE_SIZE = 20;
const ACCOUNT_PAGE_SIZE_OPTIONS = [10, 20, 50, 100];
const ACCOUNT_PAGE_SIZE_MAX = 500;

export default function ProviderLimits() {
  const [connections, setConnections] = useState([]);
  const [quotaData, setQuotaData] = useState({});
  const [loading, setLoading] = useState({});
  const [errors, setErrors] = useState({});
  const [autoRefresh, setAutoRefresh] = useState(true);
  const [lastUpdated, setLastUpdated] = useState(null);
  const [hasHydratedAutoRefresh, setHasHydratedAutoRefresh] = useState(false);
  const [refreshingAll, setRefreshingAll] = useState(false);
  const [countdown, setCountdown] = useState(60);
  const [connectionsLoading, setConnectionsLoading] = useState(true);
  const [deletingId, setDeletingId] = useState(null);
  const [togglingId, setTogglingId] = useState(null);
  const [showEditModal, setShowEditModal] = useState(false);
  const [selectedConnection, setSelectedConnection] = useState(null);
  const [proxyPools, setProxyPools] = useState([]);
  const [providerFilter, setProviderFilter] = useState("all");
  const [providerOptions, setProviderOptions] = useState([]);
  const [accountFilter, setAccountFilter] = useState("all");
  const [quotaSortMode, setQuotaSortMode] = useState("default");
  const [expiringFirst, setExpiringFirst] = useState(false);
  const [providerMenuOpen, setProviderMenuOpen] = useState(false);
  const [bulkToggling, setBulkToggling] = useState(false);
  const [page, setPage] = useState(1);
  const [pageSize, setPageSize] = useState(CONNECTIONS_PAGE_SIZE);
  const [customPageSizeInput, setCustomPageSizeInput] = useState(
    String(CONNECTIONS_PAGE_SIZE),
  );
  const [pagination, setPagination] = useState({
    page: 1,
    pageSize: CONNECTIONS_PAGE_SIZE,
    total: 0,
    totalPages: 1,
  });
  const [totals, setTotals] = useState({
    eligibleConnections: 0,
    providerFilteredConnections: 0,
  });

  const intervalRef = useRef(null);
  const countdownRef = useRef(null);

  const fetchConnections = useCallback(
    async (targetPage = page) => {
      try {
        const params = new URLSearchParams({
          page: String(targetPage),
          pageSize: String(pageSize),
          accountStatus: accountFilter,
          sort: "priority",
        });

        if (providerFilter !== "all") {
          params.set("provider", providerFilter);
        }

        const response = await fetch(
          `/api/providers/client?${params.toString()}`,
        );
        if (!response.ok) throw new Error("Failed to fetch connections");

        const data = await response.json();
        const connectionList = data.connections || [];
        const nextPagination = getSafePagination(data.pagination, pageSize);
        const nextTotals = getSafeTotals(data.totals, connectionList.length);

        setConnections(connectionList);
        setProviderOptions(getProviderOptions(data.providerOptions));
        setPagination(nextPagination);
        setTotals(nextTotals);
        setPage(getPaginationPageValue(data.pagination, targetPage));
        return connectionList;
      } catch (error) {
        console.error("Error fetching connections:", error);
        setConnections([]);
        setProviderOptions([]);
        setPagination({ page: 1, pageSize, total: 0, totalPages: 1 });
        setTotals({ eligibleConnections: 0, providerFilteredConnections: 0 });
        return [];
      }
    },
    [accountFilter, expiringFirst, page, pageSize, providerFilter],
  );

  // Fetch quota for a specific connection
  const fetchQuota = useCallback(async (connectionId, provider) => {
    setLoading((prev) => ({ ...prev, [connectionId]: true }));
    setErrors((prev) => ({ ...prev, [connectionId]: null }));

    try {
      console.log(
        `[ProviderLimits] Fetching quota for ${provider} (${connectionId})`,
      );
      const response = await fetch(`/api/usage/${connectionId}`);

      if (!response.ok) {
        const errorData = await response.json().catch(() => ({}));
        const errorMsg = errorData.error || response.statusText;

        // Handle different error types gracefully
        if (response.status === 404) {
          // Connection not found - skip silently
          console.warn(
            `[ProviderLimits] Connection not found for ${provider}, skipping`,
          );
          return;
        }

        if (response.status === 401) {
          // Auth error - show message instead of throwing
          console.warn(
            `[ProviderLimits] Auth error for ${provider}:`,
            errorMsg,
          );
          const quotaEntry = {
            quotas: [],
            message: errorMsg,
          };
          setQuotaData((prev) => ({
            ...prev,
            [connectionId]: quotaEntry,
          }));
          setQuotaCache(connectionId, quotaEntry);
          return;
        }

        throw new Error(`HTTP ${response.status}: ${errorMsg}`);
      }

      const data = await response.json();
      console.log(`[ProviderLimits] Got quota for ${provider}:`, data);

      // Parse quota data using provider-specific parser
      const parsedQuotas = parseQuotaData(provider, data);

      const quotaEntry = {
        quotas: parsedQuotas,
        plan: data.plan || null,
        message: data.message || null,
        raw: data,
      };

      setQuotaData((prev) => ({
        ...prev,
        [connectionId]: quotaEntry,
      }));
      setQuotaCache(connectionId, quotaEntry);
    } catch (error) {
      console.error(
        `[ProviderLimits] Error fetching quota for ${provider} (${connectionId}):`,
        error,
      );
      setErrors((prev) => ({
        ...prev,
        [connectionId]: error.message || "Failed to fetch quota",
      }));
    } finally {
      setLoading((prev) => ({ ...prev, [connectionId]: false }));
    }
  }, []);

  // Refresh quota for a specific provider
  const refreshProvider = useCallback(
    async (connectionId, provider) => {
      await fetchQuota(connectionId, provider);
      setLastUpdated(new Date());
    },
    [fetchQuota],
  );

  const handleDeleteConnection = useCallback(
    async (id) => {
      if (!confirm("Delete this connection?")) return;
      setDeletingId(id);
      try {
        const res = await fetch(`/api/providers/${id}`, { method: "DELETE" });
        if (res.ok) {
          setQuotaData((prev) => {
            const next = { ...prev };
            delete next[id];
            return next;
          });
          setLoading((prev) => {
            const next = { ...prev };
            delete next[id];
            return next;
          });
          setErrors((prev) => {
            const next = { ...prev };
            delete next[id];
            return next;
          });

          if (typeof window !== "undefined") {
            try {
              const cache = getQuotaCache();
              if (cache[id]) {
                delete cache[id];
                window.localStorage.setItem(
                  QUOTA_CACHE_KEY,
                  JSON.stringify(cache),
                );
              }
            } catch (e) {
              console.error("Error deleting cache entry:", e);
            }
          }

          await reconcileConnectionsPage(fetchConnections, page);
        }
      } catch (error) {
        console.error("Error deleting connection:", error);
      } finally {
        setDeletingId(null);
      }
    },
    [fetchConnections, page],
  );

  const handleToggleConnectionActive = useCallback(
    async (id, isActive) => {
      setTogglingId(id);
      try {
        const res = await fetch(`/api/providers/${id}`, {
          method: "PUT",
          headers: { "Content-Type": "application/json" },
          body: JSON.stringify({ isActive }),
        });
        if (res.ok) {
          setQuotaData((prev) => {
            const next = { ...prev };
            return next;
          });
          await reconcileConnectionsPage(fetchConnections, page);
        }
      } catch (error) {
        console.error("Error updating connection status:", error);
      } finally {
        setTogglingId(null);
      }
    },
    [fetchConnections, page],
  );

  const handleUpdateConnection = useCallback(
    async (formData) => {
      if (!selectedConnection?.id) return;
      const connectionId = selectedConnection.id;
      const provider = selectedConnection.provider;
      try {
        const res = await fetch(`/api/providers/${connectionId}`, {
          method: "PUT",
          headers: { "Content-Type": "application/json" },
          body: JSON.stringify(formData),
        });
        if (res.ok) {
          await fetchConnections();
          setShowEditModal(false);
          setSelectedConnection(null);
          if (USAGE_SUPPORTED_PROVIDERS.includes(provider)) {
            await fetchQuota(connectionId, provider);
          }
        }
      } catch (error) {
        console.error("Error saving connection:", error);
      }
    },
    [selectedConnection, fetchConnections, fetchQuota],
  );

  useEffect(() => {
    let cancelled = false;
    fetch("/api/proxy-pools?isActive=true", { cache: "no-store" })
      .then((res) => res.json())
      .then((data) => {
        if (!cancelled && data?.proxyPools) {
          setProxyPools(data.proxyPools);
        }
      })
      .catch(() => {});
    return () => {
      cancelled = true;
    };
  }, []);

  const refreshAll = useCallback(async () => {
    if (refreshingAll) return;

    setRefreshingAll(true);
    setCountdown(60);

    try {
      const visibleConnections = await fetchConnections(page);

      setLoading(buildLoadingState(visibleConnections));
      setErrors((prev) =>
        filterQuotaStateByConnections(prev, visibleConnections),
      );
      setQuotaData((prev) =>
        filterQuotaStateByConnections(prev, visibleConnections),
      );

      await Promise.all(
        visibleConnections.map((conn) => fetchQuota(conn.id, conn.provider)),
      );

      setLastUpdated(new Date());
    } catch (error) {
      console.error("Error refreshing all providers:", error);
    } finally {
      setRefreshingAll(false);
    }
  }, [refreshingAll, fetchConnections, fetchQuota, page]);

  useEffect(() => {
    const initializeData = async () => {
      setConnectionsLoading(true);
      const visibleConnections = await fetchConnections(page);
      setConnectionsLoading(false);

      // Always fetch fresh quota on mount, no cache display
      setLoading(buildLoadingState(visibleConnections));
      setErrors((prev) =>
        filterQuotaStateByConnections(prev, visibleConnections),
      );
      setQuotaData((prev) =>
        filterQuotaStateByConnections(prev, visibleConnections),
      );

      await Promise.all(
        visibleConnections.map((conn) => fetchQuota(conn.id, conn.provider)),
      );
      setLastUpdated(new Date());
    };

    initializeData();
  }, [fetchConnections, fetchQuota, page]);

  useEffect(() => {
    if (typeof window === "undefined") return;
    const stored = window.localStorage.getItem(AUTO_REFRESH_STORAGE_KEY);
    setAutoRefresh(stored === null ? true : stored === "true");
    setHasHydratedAutoRefresh(true);
  }, []);

  // Persist auto-refresh preference
  useEffect(() => {
    if (typeof window === "undefined" || !hasHydratedAutoRefresh) return;
    window.localStorage.setItem(AUTO_REFRESH_STORAGE_KEY, String(autoRefresh));
  }, [autoRefresh, hasHydratedAutoRefresh]);

  // Auto-refresh interval
  useEffect(() => {
    if (!hasHydratedAutoRefresh || !autoRefresh) {
      if (intervalRef.current) {
        clearInterval(intervalRef.current);
        intervalRef.current = null;
      }
      if (countdownRef.current) {
        clearInterval(countdownRef.current);
        countdownRef.current = null;
      }
      return;
    }

    // Main refresh interval
    intervalRef.current = setInterval(() => {
      refreshAll();
    }, REFRESH_INTERVAL_MS);

    // Countdown interval
    countdownRef.current = setInterval(() => {
      setCountdown((prev) => {
        if (prev <= 1) return 60;
        return prev - 1;
      });
    }, 1000);

    return () => {
      if (intervalRef.current) clearInterval(intervalRef.current);
      if (countdownRef.current) clearInterval(countdownRef.current);
    };
  }, [autoRefresh, refreshAll, hasHydratedAutoRefresh]);

  // Pause auto-refresh when tab is hidden (Page Visibility API)
  useEffect(() => {
    const handleVisibilityChange = () => {
      if (document.hidden) {
        if (intervalRef.current) {
          clearInterval(intervalRef.current);
          intervalRef.current = null;
        }
        if (countdownRef.current) {
          clearInterval(countdownRef.current);
          countdownRef.current = null;
        }
      } else if (autoRefresh && hasHydratedAutoRefresh) {
        // Resume auto-refresh when tab becomes visible
        intervalRef.current = setInterval(refreshAll, REFRESH_INTERVAL_MS);
        countdownRef.current = setInterval(() => {
          setCountdown((prev) => (prev <= 1 ? 60 : prev - 1));
        }, 1000);
      }
    };

    document.addEventListener("visibilitychange", handleVisibilityChange);
    return () => {
      document.removeEventListener("visibilitychange", handleVisibilityChange);
    };
  }, [autoRefresh, refreshAll, hasHydratedAutoRefresh]);

  const sortedConnections = useMemo(
    () =>
      sortVisibleConnections(
        connections,
        quotaData,
        expiringFirst,
        providerFilter,
        quotaSortMode,
      ),
    [connections, quotaData, expiringFirst, providerFilter, quotaSortMode],
  );

  // Connection is depleted when any quota entry hit the threshold
  const isConnectionDepleted = (conn) => {
    const quotas = quotaData[conn.id]?.quotas;
    if (!quotas?.length) return false;
    return quotas.some((q) => {
      if (!q.total || q.total <= 0) return false;
      return calculatePercentage(q.used, q.total) <= DEPLETED_QUOTA_THRESHOLD;
    });
  };

  const bulkSetActive = useCallback(
    async (targetIds, isActive) => {
      if (!targetIds.length || bulkToggling) return;
      setBulkToggling(true);
      try {
        await Promise.all(
          targetIds.map((id) =>
            fetch(`/api/providers/${id}`, {
              method: "PUT",
              headers: { "Content-Type": "application/json" },
              body: JSON.stringify({ isActive }),
            }),
          ),
        );
        await reconcileConnectionsPage(fetchConnections, page);
      } catch (error) {
        console.error("Error bulk toggling connections:", error);
      } finally {
        setBulkToggling(false);
      }
    },
    [bulkToggling, fetchConnections, page],
  );

  const handleDisableDepleted = () => {
    const ids = sortedConnections
      .filter((c) => (c.isActive ?? true) && isConnectionDepleted(c))
      .map((c) => c.id);
    bulkSetActive(ids, false);
  };

  const handleEnableAvailable = () => {
    const ids = sortedConnections
      .filter((c) => !(c.isActive ?? true) && !isConnectionDepleted(c))
      .map((c) => c.id);
    bulkSetActive(ids, true);
  };

  const selectedProviderLabel =
    providerFilter === "all" ? "All providers" : providerFilter;
  const hasEligibleConnections = totals.eligibleConnections > 0;
  const hasVisibleConnections = sortedConnections.length > 0;
  const emptyState = getConnectionsEmptyMessage(
    totals,
    providerFilter,
    accountFilter,
  );
  const connectionsPageSummary = getConnectionsPaginationSummary(pagination);
  const isCustomPageSize = !ACCOUNT_PAGE_SIZE_OPTIONS.includes(pageSize);
  const pageSizeLabel = getPageSizeLabel(pageSize, isCustomPageSize);

  if (!connectionsLoading && !hasEligibleConnections) {
    return (
      <Card padding="lg">
        <div className="text-center py-12">
          <span className="material-symbols-outlined text-[64px] text-text-muted opacity-20">
            cloud_off
          </span>
          <h3 className="mt-4 text-lg font-semibold text-text-primary">
            No Providers Connected
          </h3>
          <p className="mt-2 text-sm text-text-muted max-w-md mx-auto">
            Connect to providers with OAuth to track your API quota limits and
            usage.
          </p>
        </div>
      </Card>
    );
  }

  if (!connectionsLoading && !hasVisibleConnections) {
    return (
      <Card padding="lg">
        <div className="text-center py-12">
          <span className="material-symbols-outlined text-[64px] text-text-muted opacity-20">
            {emptyState.icon}
          </span>
          <h3 className="mt-4 text-lg font-semibold text-text-primary">
            {emptyState.title}
          </h3>
          <p className="mt-2 text-sm text-text-muted max-w-md mx-auto">
            {emptyState.description}
          </p>
        </div>
      </Card>
    );
  }

  return (
    <div className="space-y-6">
      {/* Header Controls */}
      <div className="flex flex-col gap-4 sm:flex-row sm:items-center sm:justify-end">
        <div className="flex flex-wrap items-center gap-1.5">
          <div className="relative">
            <button
              type="button"
              onClick={() => setProviderMenuOpen((prev) => !prev)}
              className="flex h-8 items-center justify-between gap-1 rounded-lg border border-black/10 bg-black/[0.02] px-2 text-xs text-text-primary transition-colors hover:bg-black/5 dark:border-white/10 dark:bg-white/[0.03] dark:hover:bg-white/10"
              aria-haspopup="menu"
              aria-expanded={providerMenuOpen}
              title="Filter quota providers"
            >
              <span className="flex min-w-0 items-center gap-1.5">
                {providerFilter === "all" ? (
                  <span className="material-symbols-outlined text-[14px] text-text-muted">
                    apps
                  </span>
                ) : (
                  <ProviderIcon
                    src={`/providers/${providerFilter}.png`}
                    alt={providerFilter}
                    size={18}
                    className="size-[18px] rounded object-contain"
                    fallbackText={providerFilter.slice(0, 2).toUpperCase()}
                  />
                )}
                <span className="truncate capitalize hidden lg:inline">
                  {selectedProviderLabel}
                </span>
              </span>
              <span className="material-symbols-outlined text-[14px] text-text-muted">
                expand_more
              </span>
            </button>

            {providerMenuOpen && (
              <>
                <button
                  type="button"
                  className="fixed inset-0 z-30 bg-transparent"
                  aria-label="Close provider filter"
                  onClick={() => setProviderMenuOpen(false)}
                />
                <div className="absolute left-0 z-40 mt-2 w-64 overflow-hidden rounded-2xl border border-black/10 bg-surface/95 p-1.5 shadow-xl shadow-black/10 backdrop-blur dark:border-white/10 dark:bg-surface/95 sm:w-72">
                  <button
                    type="button"
                    onClick={() => {
                      if (shouldResetPage(providerFilter, "all")) {
                        setPage(1);
                      }
                      setProviderFilter("all");
                      setProviderMenuOpen(false);
                    }}
                    className={`flex w-full items-center gap-3 rounded-xl px-3 py-2.5 text-left text-sm transition-colors ${providerFilter === "all" ? "bg-primary/10 text-primary" : "text-text-primary hover:bg-black/5 dark:hover:bg-white/10"}`}
                  >
                    <span className="material-symbols-outlined text-[22px]">
                      apps
                    </span>
                    <span className="font-medium">All providers</span>
                    {providerFilter === "all" && (
                      <span className="material-symbols-outlined ml-auto text-[20px]">
                        check
                      </span>
                    )}
                  </button>
                  <div className="my-1 h-px bg-black/10 dark:bg-white/10" />
                  <div className="max-h-72 overflow-y-auto pr-1">
                    {providerOptions.map((provider) => (
                      <button
                        key={provider}
                        type="button"
                        onClick={() => {
                          if (shouldResetPage(providerFilter, provider)) {
                            setPage(1);
                          }
                          setProviderFilter(provider);
                          setProviderMenuOpen(false);
                        }}
                        className={`flex w-full items-center gap-3 rounded-xl px-3 py-2.5 text-left text-sm transition-colors ${providerFilter === provider ? "bg-primary/10 text-primary" : "text-text-primary hover:bg-black/5 dark:hover:bg-white/10"}`}
                      >
                        <ProviderIcon
                          src={`/providers/${provider}.png`}
                          alt={provider}
                          size={24}
                          className="size-6 rounded-md object-contain"
                          fallbackText={provider.slice(0, 2).toUpperCase()}
                        />
                        <span className="font-medium capitalize">
                          {provider}
                        </span>
                        {providerFilter === provider && (
                          <span className="material-symbols-outlined ml-auto text-[20px]">
                            check
                          </span>
                        )}
                      </button>
                    ))}
                  </div>
                </div>
              </>
            )}
          </div>
          <select
            value={accountFilter}
            onChange={(event) => {
              const nextValue = event.target.value;
              if (shouldResetPage(accountFilter, nextValue)) {
                setPage(1);
              }
              setAccountFilter(nextValue);
            }}
            className="h-8 rounded-lg border border-black/10 bg-black/[0.02] px-2 text-xs text-text-primary outline-none transition-colors hover:bg-black/5 dark:border-white/10 dark:bg-white/[0.03] dark:hover:bg-white/10"
            aria-label="Filter accounts by status"
          >
            {ACCOUNT_FILTER_OPTIONS.map((option) => (
              <option key={option.value} value={option.value}>
                {option.label}
              </option>
            ))}
          </select>

          {providerFilter === "codex" && (
            <select
              value={quotaSortMode}
              onChange={(event) => setQuotaSortMode(event.target.value)}
              className="h-8 rounded-lg border border-black/10 bg-black/[0.02] px-2 text-xs text-text-primary outline-none transition-colors hover:bg-black/5 dark:border-white/10 dark:bg-white/[0.03] dark:hover:bg-white/10"
              aria-label="Sort Codex quotas by remaining"
            >
              {QUOTA_SORT_OPTIONS.map((option) => (
                <option key={option.value} value={option.value}>
                  {option.label}
                </option>
              ))}
            </select>
          )}

          <button
            type="button"
            onClick={() => setExpiringFirst((prev) => !prev)}
            aria-pressed={expiringFirst}
            className={`flex h-8 shrink-0 items-center gap-1 rounded-lg border px-2 text-xs transition-colors ${expiringFirst ? "border-amber-500/40 bg-amber-500/10 text-amber-500" : "border-black/10 text-text-primary hover:bg-black/5 dark:border-white/10 dark:hover:bg-white/5"}`}
            title="Sort accounts by earliest quota reset time"
          >
            <span className="material-symbols-outlined text-[14px]">
              hourglass_top
            </span>
            <span className="hidden sm:inline">Expiring first</span>
          </button>

          {/* Bulk: disable depleted */}
          <button
            type="button"
            onClick={handleDisableDepleted}
            disabled={bulkToggling}
            className="flex h-8 shrink-0 items-center gap-1 rounded-lg border border-red-500/30 px-2 text-xs text-red-500 transition-colors hover:bg-red-500/10 disabled:opacity-50"
            title="Disable connections with depleted quota on the current page"
          >
            <span className="material-symbols-outlined text-[14px]">block</span>
            <span className="hidden sm:inline">Turn off Empty</span>
          </button>

          {/* Bulk: enable available */}
          <button
            type="button"
            onClick={handleEnableAvailable}
            disabled={bulkToggling}
            className="flex h-8 shrink-0 items-center gap-1 rounded-lg border border-emerald-500/30 px-2 text-xs text-emerald-500 transition-colors hover:bg-emerald-500/10 disabled:opacity-50"
            title="Enable connections that still have quota on the current page"
          >
            <span className="material-symbols-outlined text-[14px]">
              check_circle
            </span>
            <span className="hidden sm:inline">Turn on Available</span>
          </button>

          {/* Auto-refresh toggle */}
          <button
            onClick={() => setAutoRefresh((prev) => !prev)}
            className="flex h-8 shrink-0 items-center gap-1 rounded-lg border border-black/10 px-2 text-xs transition-colors hover:bg-black/5 dark:border-white/10 dark:hover:bg-white/5"
            title={autoRefresh ? "Disable auto-refresh" : "Enable auto-refresh"}
          >
            <span
              className={`material-symbols-outlined text-[14px] ${
                autoRefresh ? "text-primary" : "text-text-muted"
              }`}
            >
              {autoRefresh ? "toggle_on" : "toggle_off"}
            </span>
            <span className="hidden text-text-primary sm:inline">
              Auto-refresh
            </span>
            {autoRefresh && (
              <span className="text-[10px] text-text-muted tabular-nums">
                ({countdown}s)
              </span>
            )}
          </button>

          {/* Refresh all button */}
          <button
            type="button"
            onClick={refreshAll}
            disabled={refreshingAll}
            className="flex h-8 shrink-0 items-center gap-1 rounded-lg border border-black/10 px-2 text-xs text-text-primary transition-colors hover:bg-black/5 dark:border-white/10 dark:hover:bg-white/5 disabled:opacity-50"
            title="Refresh all"
          >
            <span
              className={`material-symbols-outlined text-[14px] ${refreshingAll ? "animate-spin" : ""}`}
            >
              refresh
            </span>
          </button>
        </div>
      </div>

      {/* Provider cards: 2 columns, compact */}
      {expiringFirst && (
        <div className="rounded-xl border border-amber-500/20 bg-amber-500/10 px-3 py-2 text-xs text-amber-700 dark:text-amber-300">
          Expiring-first currently reorders accounts inside the current page.
          Cross-page ordering still follows backend pagination.
        </div>
      )}

      <div className="grid grid-cols-1 md:grid-cols-2 gap-3">
        {sortedConnections.map((conn) => {
          const quota = quotaData[conn.id];
          const isLoading = loading[conn.id];
          const error = errors[conn.id];

          // Use table layout for all providers
          const isInactive = conn.isActive === false;
          const rowBusy = deletingId === conn.id || togglingId === conn.id;

          return (
            <Card
              key={conn.id}
              padding="none"
              className={`min-w-0 ${isInactive ? "opacity-60" : ""}`}
            >
              <div className="px-3 py-2 border-b border-black/10 dark:border-white/10">
                <div className="flex items-center justify-between gap-2">
                  <div className="flex items-center gap-2 min-w-0">
                    <div className="w-8 h-8 shrink-0 rounded-md flex items-center justify-center overflow-hidden">
                      <ProviderIcon
                        src={`/providers/${conn.provider}.png`}
                        alt={conn.provider}
                        size={32}
                        className="object-contain"
                        fallbackText={
                          conn.provider?.slice(0, 2).toUpperCase() || "PR"
                        }
                      />
                    </div>
                    <div className="min-w-0">
                      <h3 className="text-sm font-semibold text-text-primary capitalize truncate">
                        {conn.provider}
                      </h3>
                      {getConnectionLabel(conn) ? (
                        <p className="text-xs text-text-muted truncate">
                          {getConnectionLabel(conn)}
                        </p>
                      ) : null}
                    </div>
                  </div>

                  <div className="flex items-center gap-1 shrink-0">
                    <button
                      type="button"
                      onClick={() => refreshProvider(conn.id, conn.provider)}
                      disabled={isLoading || rowBusy}
                      aria-label="Refresh quota"
                      className="p-1.5 rounded-lg hover:bg-black/5 dark:hover:bg-white/5 transition-colors disabled:opacity-50"
                      title="Refresh quota"
                    >
                      <span
                        className={`material-symbols-outlined text-[18px] text-text-muted ${isLoading ? "animate-spin" : ""}`}
                      >
                        refresh
                      </span>
                    </button>
                    <button
                      type="button"
                      onClick={() => {
                        setSelectedConnection(conn);
                        setShowEditModal(true);
                      }}
                      disabled={rowBusy}
                      aria-label="Edit connection"
                      className="p-1.5 rounded-lg hover:bg-black/5 dark:hover:bg-white/5 text-text-muted hover:text-primary transition-colors disabled:opacity-50"
                      title="Edit connection"
                    >
                      <span className="material-symbols-outlined text-[18px]">
                        edit
                      </span>
                    </button>
                    <button
                      type="button"
                      onClick={() => handleDeleteConnection(conn.id)}
                      disabled={rowBusy}
                      aria-label="Delete connection"
                      className="p-1.5 rounded-lg hover:bg-red-500/10 text-red-500 transition-colors disabled:opacity-50"
                      title="Delete connection"
                    >
                      <span
                        className={`material-symbols-outlined text-[18px] ${deletingId === conn.id ? "animate-pulse" : ""}`}
                      >
                        delete
                      </span>
                    </button>
                    <div
                      className="inline-flex items-center pl-0.5"
                      title={
                        (conn.isActive ?? true)
                          ? "Disable connection"
                          : "Enable connection"
                      }
                    >
                      <Toggle
                        size="sm"
                        checked={conn.isActive ?? true}
                        disabled={rowBusy}
                        onChange={(nextActive) =>
                          handleToggleConnectionActive(conn.id, nextActive)
                        }
                      />
                    </div>
                  </div>
                </div>
              </div>

              <div className="px-2 py-1.5">
                {isLoading ? (
                  <div className="text-center py-5 text-text-muted">
                    <span className="material-symbols-outlined text-[28px] animate-spin">
                      progress_activity
                    </span>
                  </div>
                ) : error ? (
                  <div className="text-center py-5">
                    <span className="material-symbols-outlined text-[28px] text-red-500">
                      error
                    </span>
                    <p className="mt-1.5 text-xs text-text-muted">{error}</p>
                  </div>
                ) : quota?.message ? (
                  <div className="text-center py-5">
                    <p className="text-xs text-text-muted">{quota.message}</p>
                  </div>
                ) : (
                  <QuotaTable
                    quotas={quota?.quotas}
                    compact
                    sortMode="default"
                    showSortLabel={
                      conn.provider === "codex" && quotaSortMode !== "default"
                    }
                  />
                )}
              </div>
            </Card>
          );
        })}
      </div>

      <div className="rounded-xl border border-black/10 bg-black/[0.02] px-3 py-2 dark:border-white/10 dark:bg-white/[0.03]">
          <div className="flex flex-wrap items-center justify-between gap-2">
            <span className="text-xs text-text-muted">{connectionsPageSummary}</span>
            <div className="flex flex-wrap items-center gap-2">
              <select
                value={isCustomPageSize ? "custom" : String(pageSize)}
                onChange={(event) => {
                  const nextValue = event.target.value;
                  if (nextValue === "custom") return;
                  const nextPageSize = Number.parseInt(nextValue, 10);
                  if (Number.isFinite(nextPageSize)) {
                    setPage(1);
                    setPageSize(nextPageSize);
                    setCustomPageSizeInput(String(nextPageSize));
                  }
                }}
                className="h-8 rounded-lg border border-black/10 bg-black/[0.02] px-2 text-xs text-text-primary outline-none transition-colors hover:bg-black/5 dark:border-white/10 dark:bg-white/[0.03] dark:hover:bg-white/10"
                aria-label="Accounts per page"
              >
                {ACCOUNT_PAGE_SIZE_OPTIONS.map((option) => (
                  <option key={option} value={String(option)}>
                    {option} / page
                  </option>
                ))}
                <option value="custom">Custom</option>
              </select>
              <input
                type="number"
                min="1"
                max={String(ACCOUNT_PAGE_SIZE_MAX)}
                inputMode="numeric"
                value={customPageSizeInput}
                onChange={(event) => setCustomPageSizeInput(event.target.value)}
                onBlur={() => {
                  const parsedValue = Number.parseInt(customPageSizeInput, 10);
                  if (!Number.isFinite(parsedValue)) {
                    setCustomPageSizeInput(String(pageSize));
                    return;
                  }
                  const nextPageSize = Math.min(ACCOUNT_PAGE_SIZE_MAX, Math.max(1, parsedValue));
                  setPage(1);
                  setPageSize(nextPageSize);
                  setCustomPageSizeInput(String(nextPageSize));
                }}
                onKeyDown={(event) => {
                  if (event.key !== "Enter") return;
                  const parsedValue = Number.parseInt(customPageSizeInput, 10);
                  if (!Number.isFinite(parsedValue)) {
                    setCustomPageSizeInput(String(pageSize));
                    return;
                  }
                  const nextPageSize = Math.min(ACCOUNT_PAGE_SIZE_MAX, Math.max(1, parsedValue));
                  setPage(1);
                  setPageSize(nextPageSize);
                  setCustomPageSizeInput(String(nextPageSize));
                }}
                className="h-8 w-20 rounded-lg border border-black/10 bg-black/[0.02] px-2 text-xs text-text-primary outline-none transition-colors hover:bg-black/5 dark:border-white/10 dark:bg-white/[0.03] dark:hover:bg-white/10"
                aria-label="Custom accounts per page"
                placeholder="Custom"
              />
              <span className="text-xs text-text-muted">Page {pagination.page} / {pagination.totalPages}</span>
            </div>
            <div className="flex items-center gap-1.5">
              <button
                type="button"
                onClick={() => setPage(1)}
                disabled={
                  pagination.page <= 1 || connectionsLoading || refreshingAll
                }
                className="flex h-8 items-center rounded-lg border border-black/10 px-3 text-xs text-text-primary transition-colors hover:bg-black/5 disabled:cursor-not-allowed disabled:opacity-40 dark:border-white/10 dark:hover:bg-white/5"
              >
                First Page
              </button>
              <button
                type="button"
                onClick={() =>
                  setPage((currentPage) => Math.max(1, currentPage - 1))
                }
                disabled={
                  pagination.page <= 1 || connectionsLoading || refreshingAll
                }
                className="flex h-8 w-8 items-center justify-center rounded-lg border border-black/10 text-text-primary transition-colors hover:bg-black/5 disabled:cursor-not-allowed disabled:opacity-40 dark:border-white/10 dark:hover:bg-white/5"
                aria-label="Previous accounts page"
              >
                <span className="material-symbols-outlined text-[16px]">
                  chevron_left
                </span>
              </button>
              <button
                type="button"
                onClick={() =>
                  setPage((currentPage) =>
                    Math.min(pagination.totalPages, currentPage + 1),
                  )
                }
                disabled={
                  pagination.page >= pagination.totalPages ||
                  connectionsLoading ||
                  refreshingAll
                }
                className="flex h-8 w-8 items-center justify-center rounded-lg border border-black/10 text-text-primary transition-colors hover:bg-black/5 disabled:cursor-not-allowed disabled:opacity-40 dark:border-white/10 dark:hover:bg-white/5"
                aria-label="Next accounts page"
              >
                <span className="material-symbols-outlined text-[16px]">
                  chevron_right
                </span>
              </button>
              <button
                type="button"
                onClick={() => setPage(pagination.totalPages)}
                disabled={
                  pagination.page >= pagination.totalPages ||
                  connectionsLoading ||
                  refreshingAll
                }
                className="flex h-8 items-center rounded-lg border border-black/10 px-3 text-xs text-text-primary transition-colors hover:bg-black/5 disabled:cursor-not-allowed disabled:opacity-40 dark:border-white/10 dark:hover:bg-white/5"
              >
                Last Page
              </button>
            </div>
          </div>
        </div>

      <EditConnectionModal
        isOpen={showEditModal}
        connection={selectedConnection}
        proxyPools={proxyPools}
        onSave={handleUpdateConnection}
        onClose={() => {
          setShowEditModal(false);
          setSelectedConnection(null);
        }}
      />
    </div>
  );
}