"use client";

import { useQuery } from "@tanstack/react-query";
import { api } from "@/lib/api";
import type { Case } from "@/lib/types";
import Link from "next/link";
import { useSearchParams, useRouter } from "next/navigation";
import { Breadcrumb } from "@/components/layout/Breadcrumb";
import { Plus, Search, FolderOpen } from "lucide-react";
import { useState } from "react";
import { SkeletonTable } from "@/components/ui/Skeleton";
import { EmptyState } from "@/components/ui/EmptyState";
import { usePermissions } from "@/lib/hooks/usePermissions";

const STATUS_OPTIONS = [
  { value: "", label: "Alle Status" },
  { value: "active", label: "Aktiv" },
  { value: "pending", label: "Anhängig" },
  { value: "closed", label: "Geschlossen" },
  { value: "archived", label: "Archiviert" },
];

const TYPE_OPTIONS = [
  { value: "", label: "Alle Typen" },
  { value: "INF", label: "Verletzungsklage" },
  { value: "REV", label: "Widerruf" },
  { value: "CCR", label: "Einstweilige Verfügung" },
  { value: "APP", label: "Berufung" },
  { value: "PI", label: "Vorläufiger Rechtsschutz" },
  { value: "ZPO_CIVIL", label: "ZPO Zivilverfahren" },
];

const STATUS_BADGE: Record<string, string> = {
  active: "bg-emerald-50 text-emerald-700",
  pending: "bg-amber-50 text-amber-700",
  closed: "bg-neutral-100 text-neutral-600",
  archived: "bg-neutral-100 text-neutral-400",
};

const STATUS_LABEL: Record<string, string> = {
  active: "Aktiv",
  pending: "Anhängig",
  closed: "Geschlossen",
  archived: "Archiviert",
};

const inputClass =
  "rounded-md border border-neutral-200 bg-white px-2.5 py-1.5 text-sm outline-none transition-colors focus:border-neutral-400 focus:ring-1 focus:ring-neutral-400";

export default function CasesPage() {
  const router = useRouter();
  const searchParams = useSearchParams();
  const { can } = usePermissions();
  const canCreateCase = can("create_case");

  const [search, setSearch] = useState(searchParams.get("search") ?? "");
  const [status, setStatus] = useState(searchParams.get("status") ?? "");
  const [type, setType] = useState(searchParams.get("type") ?? "");

  const { data, isLoading } = useQuery({
    queryKey: ["cases", { search, status, type }],
    queryFn: () => {
      const params = new URLSearchParams();
      if (search) params.set("search", search);
      if (status) params.set("status", status);
      if (type) params.set("type", type);
      params.set("limit", "50");
      const qs = params.toString();
      return api.get<{ cases: Case[]; total: number }>(
        `/cases${qs ? `?${qs}` : ""}`,
      );
    },
  });

  const cases = Array.isArray(data?.cases) ? data.cases : [];

  return (
    <div className="animate-fade-in">
      <Breadcrumb
        items={[
          { label: "Dashboard", href: "/dashboard" },
          { label: "Akten" },
        ]}
      />
      <div className="flex flex-col gap-3 sm:flex-row sm:items-center sm:justify-between">
        <div>
          <h1 className="text-lg font-semibold text-neutral-900">Akten</h1>
          <p className="mt-0.5 text-sm text-neutral-500">
            {data ? `${data.total} Akten` : "\u00A0"}
          </p>
        </div>
        {canCreateCase && (
          <Link
            href="/cases/new"
            className="inline-flex w-fit items-center gap-1.5 rounded-md bg-neutral-900 px-3 py-1.5 text-sm font-medium text-white transition-colors hover:bg-neutral-800"
          >
            <Plus className="h-4 w-4" />
            Neue Akte
          </Link>
        )}
      </div>

      <div className="mt-4 flex flex-col gap-3 sm:flex-row sm:items-center">
        <div className="relative flex-1">
          <Search className="absolute left-2.5 top-1/2 h-4 w-4 -translate-y-1/2 text-neutral-400" />
          <input
            type="text"
            placeholder="Suchen nach Aktenzeichen, Titel..."
            value={search}
            onChange={(e) => setSearch(e.target.value)}
            className={`w-full pl-9 pr-3 ${inputClass}`}
          />
        </div>
        <div className="flex gap-3">
          <select
            value={status}
            onChange={(e) => setStatus(e.target.value)}
            className={inputClass}
          >
            {STATUS_OPTIONS.map((o) => (
              <option key={o.value} value={o.value}>
                {o.label}
              </option>
            ))}
          </select>
          <select
            value={type}
            onChange={(e) => setType(e.target.value)}
            className={inputClass}
          >
            {TYPE_OPTIONS.map((o) => (
              <option key={o.value} value={o.value}>
                {o.label}
              </option>
            ))}
          </select>
        </div>
      </div>

      <div className="mt-4">
        {isLoading ? (
          <SkeletonTable rows={5} />
        ) : cases.length === 0 ? (
          <EmptyState
            icon={FolderOpen}
            title="Keine Akten gefunden"
            description={
              search || status || type
                ? "Versuchen Sie andere Suchkriterien."
                : "Erstellen Sie Ihre erste Akte, um loszulegen."
            }
            action={
              !search && !status && !type && canCreateCase ? (
                <Link
                  href="/cases/new"
                  className="inline-flex items-center gap-1.5 rounded-md bg-neutral-900 px-3 py-1.5 text-sm font-medium text-white transition-colors hover:bg-neutral-800"
                >
                  <Plus className="h-4 w-4" />
                  Neue Akte anlegen
                </Link>
              ) : undefined
            }
          />
        ) : (
          <div className="-mx-4 overflow-x-auto sm:mx-0">
            <div className="min-w-[640px] sm:min-w-0">
              <div className="overflow-hidden rounded-md border border-neutral-200 bg-white">
                <table className="w-full text-sm">
                  <thead>
                    <tr className="border-b border-neutral-100 text-left text-xs font-medium uppercase tracking-wider text-neutral-400">
                      <th className="px-4 py-2.5">Aktenzeichen</th>
                      <th className="px-4 py-2.5">Titel</th>
                      <th className="hidden px-4 py-2.5 md:table-cell">Typ</th>
                      <th className="hidden px-4 py-2.5 lg:table-cell">
                        Gericht
                      </th>
                      <th className="px-4 py-2.5">Status</th>
                      <th className="hidden px-4 py-2.5 sm:table-cell">
                        Erstellt
                      </th>
                    </tr>
                  </thead>
                  <tbody className="divide-y divide-neutral-100">
                    {cases.map((c) => (
                      <tr
                        key={c.id}
                        onClick={() => router.push(`/cases/${c.id}`)}
                        className="cursor-pointer transition-colors hover:bg-neutral-50"
                      >
                        <td className="whitespace-nowrap px-4 py-2.5 font-medium text-neutral-900">
                          {c.case_number}
                        </td>
                        <td className="max-w-[200px] truncate px-4 py-2.5 text-neutral-700">
                          {c.title}
                        </td>
                        <td className="hidden px-4 py-2.5 text-neutral-500 md:table-cell">
                          {c.case_type ?? "-"}
                        </td>
                        <td className="hidden px-4 py-2.5 text-neutral-500 lg:table-cell">
                          {c.court ?? "-"}
                        </td>
                        <td className="px-4 py-2.5">
                          <span
                            className={`inline-block rounded-full px-2 py-0.5 text-xs font-medium ${STATUS_BADGE[c.status] ?? "bg-neutral-100 text-neutral-500"}`}
                          >
                            {STATUS_LABEL[c.status] ?? c.status}
                          </span>
                        </td>
                        <td className="hidden whitespace-nowrap px-4 py-2.5 text-neutral-400 sm:table-cell">
                          {new Date(c.created_at).toLocaleDateString("de-DE")}
                        </td>
                      </tr>
                    ))}
                  </tbody>
                </table>
              </div>
            </div>
          </div>
        )}
      </div>
    </div>
  );
}