"use client";

import { useEffect, useState } from "react";
import { useParams, useSearchParams } from "next/navigation";
import Link from "next/link";
import {
  ServerIcon,
  CalendarIcon,
  DocumentTextIcon,
  XCircleIcon,
} from "@heroicons/react/24/outline";
import { useSubscription } from "@/features/subscriptions/hooks";
import { InvoicesList } from "@/features/billing/components/InvoiceList/InvoiceList";
import { Formatting } from "@customer-portal/domain/toolkit";
import { PageLayout } from "@/components/templates/PageLayout";
import { StatusPill } from "@/components/atoms/status-pill";
import {
  SubscriptionDetailStatsSkeleton,
  InvoiceListSkeleton,
} from "@/components/atoms/loading-skeleton";
import { formatIsoDate } from "@/shared/utils";

const { formatCurrency: sharedFormatCurrency } = Formatting;
import { SimManagementSection } from "@/features/subscriptions/components/sim";
import {
  getBillingCycleLabel,
  getSubscriptionStatusVariant,
} from "@/features/subscriptions/utils/status-presenters";
import { cn } from "@/shared/utils";

export function SubscriptionDetailContainer() {
  const params = useParams();
  const searchParams = useSearchParams();
  const [activeTab, setActiveTab] = useState<"overview" | "sim">("overview");

  const subscriptionId = parseInt(params.id as string);
  const { data: subscription, error } = useSubscription(subscriptionId);

  // Simple loading check: show skeleton until we have data or an error
  const showLoading = !subscription && !error;

  useEffect(() => {
    const updateTab = () => {
      const hash = typeof window !== "undefined" ? window.location.hash : "";
      const service = (searchParams.get("service") || "").toLowerCase();
      const isSimContext = hash.includes("sim-management") || service === "sim";
      setActiveTab(isSimContext ? "sim" : "overview");
    };
    updateTab();
    if (typeof window !== "undefined") {
      window.addEventListener("hashchange", updateTab);
      return () => window.removeEventListener("hashchange", updateTab);
    }
    return;
  }, [searchParams]);

  const formatDate = (dateString: string | undefined) => formatIsoDate(dateString);

  const formatCurrency = (amount: number) => sharedFormatCurrency(amount || 0);

  // Show error message (only when we have an error, not during loading)
  const pageError = error
    ? process.env.NODE_ENV === "development" && error instanceof Error
      ? error.message
      : "Unable to load subscription details. Please try again."
    : null;

  const productNameLower = subscription?.productName?.toLowerCase() ?? "";
  const isSimService = productNameLower.includes("sim");
  // Match: "Internet", "SonixNet via NTT Optical Fiber", or any NTT-based fiber service
  const isInternetService =
    productNameLower.includes("internet") ||
    productNameLower.includes("sonixnet") ||
    (productNameLower.includes("ntt") && productNameLower.includes("fiber"));
  const canCancel = subscription?.status === "Active";

  // Header action: cancel button (for Internet services)
  const headerActions =
    isInternetService && canCancel ? (
      <Link
        href={`/account/subscriptions/${subscriptionId}/cancel`}
        className="inline-flex items-center gap-2 px-4 py-2 text-sm font-medium text-danger-foreground bg-danger hover:bg-danger/90 rounded-lg transition-colors"
      >
        <XCircleIcon className="h-4 w-4" />
        Cancel Service
      </Link>
    ) : undefined;

  // Render skeleton matching loading.tsx structure when loading
  if (showLoading) {
    return (
      <PageLayout
        icon={<ServerIcon className="h-6 w-6" />}
        title="Subscription"
        description="Loading subscription details..."
        breadcrumbs={[
          { label: "Subscriptions", href: "/account/subscriptions" },
          { label: "Subscription" },
        ]}
      >
        <div className="space-y-6">
          <SubscriptionDetailStatsSkeleton />
          <InvoiceListSkeleton rows={5} />
        </div>
      </PageLayout>
    );
  }

  return (
    <PageLayout
      icon={<ServerIcon className="h-6 w-6" />}
      title={subscription?.productName ?? "Subscription"}
      actions={headerActions}
      breadcrumbs={[
        { label: "Subscriptions", href: "/account/subscriptions" },
        { label: subscription?.productName ?? "Subscription" },
      ]}
      error={pageError}
    >
      {subscription ? (
        <div className="space-y-6">
          {/* Subscription Stats */}
          <div className="bg-card border border-border rounded-2xl shadow-sm overflow-hidden">
            <div className="px-6 py-5 grid grid-cols-2 md:grid-cols-4 gap-6">
              <div>
                <h4 className="text-xs font-semibold text-muted-foreground uppercase tracking-wider">
                  Service Status
                </h4>
                <div className="mt-2">
                  <StatusPill
                    label={subscription.status}
                    variant={getSubscriptionStatusVariant(subscription.status)}
                    size="lg"
                  />
                </div>
              </div>
              <div>
                <h4 className="text-xs font-semibold text-muted-foreground uppercase tracking-wider">
                  Billing Amount
                </h4>
                <div className="mt-2 flex items-baseline gap-2">
                  <p className="text-2xl font-bold text-foreground">
                    {formatCurrency(subscription.amount)}
                  </p>
                  <span className="text-sm text-muted-foreground">
                    {getBillingCycleLabel(subscription.cycle)}
                  </span>
                </div>
              </div>
              <div>
                <h4 className="text-xs font-semibold text-muted-foreground uppercase tracking-wider">
                  Next Due Date
                </h4>
                <div className="flex items-center mt-2 gap-2">
                  <CalendarIcon className="h-4 w-4 text-muted-foreground" />
                  <p className="text-lg font-medium text-foreground">
                    {formatDate(subscription.nextDue)}
                  </p>
                </div>
              </div>
              <div>
                <h4 className="text-xs font-semibold text-muted-foreground uppercase tracking-wider">
                  Registration Date
                </h4>
                <div className="flex items-center mt-2 gap-2">
                  <CalendarIcon className="h-4 w-4 text-muted-foreground" />
                  <p className="text-lg font-medium text-foreground">
                    {formatDate(subscription.registrationDate)}
                  </p>
                </div>
              </div>
            </div>
          </div>

          {/* Tab Navigation for SIM Services */}
          {isSimService && (
            <div className="flex items-center gap-1 p-1 bg-muted rounded-lg w-fit">
              <Link
                href={`/account/subscriptions/${subscriptionId}`}
                className={cn(
                  "px-4 py-2 text-sm font-medium rounded-md transition-all flex items-center gap-2",
                  activeTab === "overview"
                    ? "bg-card text-foreground shadow-sm"
                    : "text-muted-foreground hover:text-foreground"
                )}
              >
                <DocumentTextIcon className="h-4 w-4" />
                Overview & Billing
              </Link>
              <Link
                href={`/account/subscriptions/${subscriptionId}#sim-management`}
                className={cn(
                  "px-4 py-2 text-sm font-medium rounded-md transition-all flex items-center gap-2",
                  activeTab === "sim"
                    ? "bg-card text-foreground shadow-sm"
                    : "text-muted-foreground hover:text-foreground"
                )}
              >
                <ServerIcon className="h-4 w-4" />
                SIM Management
              </Link>
            </div>
          )}

          {/* SIM Management Section */}
          {activeTab === "sim" && isSimService && (
            <SimManagementSection subscriptionId={subscriptionId} />
          )}

          {/* Billing History Section */}
          {activeTab === "overview" && (
            <div className="space-y-4">
              <div className="flex items-center justify-between">
                <h3 className="text-lg font-semibold text-foreground">Billing History</h3>
              </div>
              <InvoicesList subscriptionId={subscriptionId} pageSize={5} showFilters={false} />
            </div>
          )}
        </div>
      ) : null}
    </PageLayout>
  );
}

export default SubscriptionDetailContainer;