"use client";

import { useQuery } from "@tanstack/react-query";
import { api } from "@/lib/api";
import type { Invoice } from "@/lib/types";
import { format } from "date-fns";
import { de } from "date-fns/locale";
import { Receipt, Loader2 } from "lucide-react";
import Link from "next/link";
import { useState } from "react";
import { Breadcrumb } from "@/components/layout/Breadcrumb";

const STATUS_BADGE: Record<string, string> = {
  draft: "bg-neutral-100 text-neutral-600",
  sent: "bg-blue-50 text-blue-700",
  paid: "bg-emerald-50 text-emerald-700",
  cancelled: "bg-red-50 text-red-600",
};

const STATUS_LABEL: Record<string, string> = {
  draft: "Entwurf",
  sent: "Versendet",
  paid: "Bezahlt",
  cancelled: "Storniert",
};

export default function RechnungenPage() {
  const [statusFilter, setStatusFilter] = useState("");

  const { data, isLoading } = useQuery({
    queryKey: ["invoices", statusFilter],
    queryFn: () => {
      const params = statusFilter ? `?status=${statusFilter}` : "";
      return api.get<{ invoices: Invoice[] }>(`/invoices${params}`);
    },
  });

  const invoices = data?.invoices ?? [];

  return (
    <div className="animate-fade-in">
      <Breadcrumb
        items={[
          { label: "Dashboard", href: "/dashboard" },
          { label: "Abrechnung", href: "/abrechnung" },
          { label: "Rechnungen" },
        ]}
      />

      <div className="mt-4 flex items-center justify-between">
        <h1 className="text-lg font-semibold text-neutral-900">Rechnungen</h1>
      </div>

      {/* Filters */}
      <div className="mt-4 flex gap-2">
        {["", "draft", "sent", "paid", "cancelled"].map((s) => (
          <button
            key={s}
            onClick={() => setStatusFilter(s)}
            className={`rounded-md px-2.5 py-1 text-xs font-medium transition-colors ${
              statusFilter === s
                ? "bg-neutral-900 text-white"
                : "bg-neutral-100 text-neutral-600 hover:bg-neutral-200"
            }`}
          >
            {s === "" ? "Alle" : STATUS_LABEL[s]}
          </button>
        ))}
      </div>

      {isLoading ? (
        <div className="flex items-center justify-center py-8">
          <Loader2 className="h-5 w-5 animate-spin text-neutral-400" />
        </div>
      ) : invoices.length === 0 ? (
        <div className="flex flex-col items-center py-12 text-center">
          <div className="rounded-xl bg-neutral-100 p-3">
            <Receipt className="h-5 w-5 text-neutral-400" />
          </div>
          <p className="mt-2 text-sm text-neutral-500">
            Keine Rechnungen vorhanden.
          </p>
        </div>
      ) : (
        <div className="mt-4 space-y-2">
          {invoices.map((inv) => (
            <Link
              key={inv.id}
              href={`/abrechnung/rechnungen/${inv.id}`}
              className="flex items-center justify-between rounded-md border border-neutral-200 bg-white px-4 py-3 transition-colors hover:bg-neutral-50"
            >
              <div>
                <div className="flex items-center gap-2">
                  <p className="text-sm font-medium text-neutral-900">
                    {inv.invoice_number}
                  </p>
                  <span
                    className={`rounded-full px-2 py-0.5 text-xs font-medium ${STATUS_BADGE[inv.status]}`}
                  >
                    {STATUS_LABEL[inv.status]}
                  </span>
                </div>
                <p className="mt-0.5 text-xs text-neutral-500">
                  {inv.client_name}
                  {inv.issued_at &&
                    ` — ${format(new Date(inv.issued_at), "d. MMM yyyy", { locale: de })}`}
                </p>
              </div>
              <p className="text-sm font-semibold text-neutral-900">
                {inv.total.toFixed(2)} EUR
              </p>
            </Link>
          ))}
        </div>
      )}
    </div>
  );
}