"use client";

import { SubCard } from "@/components/molecules/SubCard/SubCard";
import { DetailHeader } from "@/components/molecules/DetailHeader/DetailHeader";
import { useEffect, useState } from "react";
import { useParams, useSearchParams } from "next/navigation";
import Link from "next/link";
import { ServerIcon, CalendarIcon, DocumentTextIcon } from "@heroicons/react/24/outline";
import { format } from "date-fns";
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";

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

export function SubscriptionDetailContainer() {
  const params = useParams();
  const searchParams = useSearchParams();
  const [showInvoices, setShowInvoices] = useState(true);
  const [showSimManagement, setShowSimManagement] = useState(false);

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

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

  const formatDate = (dateString: string | undefined) => {
    if (!dateString) return "N/A";
    try {
      return format(new Date(dateString), "MMM d, yyyy");
    } catch {
      return "Invalid date";
    }
  };

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

  const pageError =
    error || !subscription
      ? process.env.NODE_ENV === "development"
        ? error instanceof Error
          ? error.message
          : "Subscription not found"
        : "Unable to load subscription details. Please try again."
      : null;

  const isSimService = Boolean(subscription?.productName?.toLowerCase().includes("sim"));

  return (
    <PageLayout
      icon={<ServerIcon className="h-6 w-6" />}
      title={subscription?.productName ?? "Subscription"}
      description={
        subscription ? `Service ID: ${subscription.serviceId}` : "View your subscription details"
      }
      breadcrumbs={[
        { label: "Subscriptions", href: "/subscriptions" },
        { label: subscription?.productName ?? "Subscription" },
      ]}
      loading={isLoading}
      error={pageError}
    >
      {subscription ? (
        <div className="max-w-7xl mx-auto">
          <SubCard className="mb-6">
            <DetailHeader
              title="Subscription Details"
              subtitle="Service subscription information"
              leftIcon={getSubscriptionStatusIcon(subscription.status)}
              status={{
                label: subscription.status,
                variant: getSubscriptionStatusVariant(subscription.status),
              }}
            />
            <div className="pt-4">
              <div className="grid grid-cols-1 md:grid-cols-3 gap-6">
                <div>
                  <h4 className="text-sm font-medium 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-sm font-medium text-muted-foreground uppercase tracking-wider">
                    Next Due Date
                  </h4>
                  <div className="flex items-center mt-2">
                    <CalendarIcon className="h-4 w-4 text-muted-foreground/70 mr-2" />
                    <p className="text-lg font-medium text-foreground">
                      {formatDate(subscription.nextDue)}
                    </p>
                  </div>
                </div>
                <div>
                  <h4 className="text-sm font-medium text-muted-foreground uppercase tracking-wider">
                    Registration Date
                  </h4>
                  <div className="flex items-center mt-2">
                    <CalendarIcon className="h-4 w-4 text-muted-foreground/70 mr-2" />
                    <p className="text-lg font-medium text-foreground">
                      {formatDate(subscription.registrationDate)}
                    </p>
                  </div>
                </div>
              </div>
            </div>
          </SubCard>

          {isSimService && (
            <div className="mb-8">
              <SubCard>
                <div className="flex flex-col lg:flex-row lg:items-center lg:justify-between gap-4">
                  <div>
                    <h3 className="text-xl font-semibold text-foreground">Service Management</h3>
                    <p className="text-sm text-muted-foreground mt-1">
                      Switch between billing and SIM management views
                    </p>
                  </div>
                  <div className="flex flex-col sm:flex-row gap-2 bg-muted rounded-xl p-2 border border-border/60">
                    <Link
                      href={`/subscriptions/${subscriptionId}#sim-management`}
                      className={`px-6 py-3 text-sm font-semibold rounded-lg transition-colors min-w-[140px] text-center ${
                        showSimManagement
                          ? "bg-card text-primary shadow-[var(--cp-shadow-1)]"
                          : "text-muted-foreground hover:text-foreground hover:bg-card/60"
                      }`}
                    >
                      <ServerIcon className="h-4 w-4 inline mr-2" />
                      SIM Management
                    </Link>
                    <Link
                      href={`/subscriptions/${subscriptionId}`}
                      className={`px-6 py-3 text-sm font-semibold rounded-lg transition-colors min-w-[120px] text-center ${
                        showInvoices
                          ? "bg-card text-primary shadow-[var(--cp-shadow-1)]"
                          : "text-muted-foreground hover:text-foreground hover:bg-card/60"
                      }`}
                    >
                      <DocumentTextIcon className="h-4 w-4 inline mr-2" />
                      Invoices
                    </Link>
                  </div>
                </div>
              </SubCard>
            </div>
          )}

          {showSimManagement && (
            <div className="mb-10">
              <SimManagementSection subscriptionId={subscriptionId} />
            </div>
          )}

          {showInvoices && <InvoicesList subscriptionId={subscriptionId} pageSize={5} />}
        </div>
      ) : null}
    </PageLayout>
  );
}

export default SubscriptionDetailContainer;