"use client";

import { useState } from "react";
import { GERMAN_FEDERAL_STATES } from "@planarchy/shared";
import { trpc } from "~/lib/trpc/client.js";

export function PublicHolidayBatch() {
  const [year, setYear] = useState(new Date().getFullYear());
  const [federalState, setFederalState] = useState("BY");
  const [chapter, setChapter] = useState("");
  const [replaceExisting, setReplaceExisting] = useState(false);
  const [result, setResult] = useState<{ created: number; holidays?: number; resources?: number } | null>(null);

  const { data: resources } = trpc.resource.list.useQuery(
    { isActive: true, limit: 500 },
    { staleTime: 60_000 },
  );

  const resourceList = (resources?.resources ?? []) as Array<{ id: string; chapter?: string | null }>;
  const chapters = Array.from(
    new Set(resourceList.map((r) => r.chapter).filter(Boolean) as string[])
  ).sort();

  const mutation = trpc.vacation.batchCreatePublicHolidays.useMutation({
    onSuccess: (data) => setResult(data),
  });

  function handleSubmit(e: React.FormEvent) {
    e.preventDefault();
    setResult(null);
    mutation.mutate({
      year,
      federalState: federalState || undefined,
      chapter: chapter || undefined,
      replaceExisting,
    });
  }

  return (
    <div className="rounded-xl border border-gray-200 dark:border-gray-700 bg-white dark:bg-gray-800 p-5 space-y-4">
      <h3 className="text-sm font-semibold text-gray-800 dark:text-gray-100">Batch Create Public Holidays</h3>
      <p className="text-xs text-gray-500 dark:text-gray-400">
        Creates public holidays as APPROVED vacation entries for all resources (or a chapter).
      </p>

      <form onSubmit={handleSubmit} className="space-y-4">
        <div className="grid grid-cols-3 gap-3">
          <div>
            <label className="block text-xs font-medium text-gray-600 dark:text-gray-400 mb-1">Year</label>
            <input
              type="number"
              value={year}
              onChange={(e) => setYear(parseInt(e.target.value, 10))}
              min={2020}
              max={2030}
              className="w-full px-3 py-2 border border-gray-200 dark:border-gray-600 rounded-lg text-sm focus:outline-none focus:ring-2 focus:ring-brand-500 dark:bg-gray-900 dark:text-gray-100"
            />
          </div>
          <div>
            <label className="block text-xs font-medium text-gray-600 dark:text-gray-400 mb-1">Federal State</label>
            <select
              value={federalState}
              onChange={(e) => setFederalState(e.target.value)}
              className="w-full px-3 py-2 border border-gray-200 dark:border-gray-600 rounded-lg text-sm focus:outline-none focus:ring-2 focus:ring-brand-500 dark:bg-gray-900 dark:text-gray-100"
            >
              <option value="">Federal only</option>
              {Object.entries(GERMAN_FEDERAL_STATES).map(([abbr, name]) => (
                <option key={abbr} value={abbr}>{name} ({abbr})</option>
              ))}
            </select>
          </div>
          <div>
            <label className="block text-xs font-medium text-gray-600 dark:text-gray-400 mb-1">Chapter (optional)</label>
            <select
              value={chapter}
              onChange={(e) => setChapter(e.target.value)}
              className="w-full px-3 py-2 border border-gray-200 dark:border-gray-600 rounded-lg text-sm focus:outline-none focus:ring-2 focus:ring-brand-500 dark:bg-gray-900 dark:text-gray-100"
            >
              <option value="">All chapters</option>
              {chapters.map((c) => (
                <option key={c} value={c}>{c}</option>
              ))}
            </select>
          </div>
        </div>

        <label className="flex items-center gap-2 cursor-pointer text-sm text-gray-600 dark:text-gray-400">
          <input
            type="checkbox"
            checked={replaceExisting}
            onChange={(e) => setReplaceExisting(e.target.checked)}
            className="rounded border-gray-300 dark:border-gray-600 text-brand-600"
          />
          Replace existing public holidays on those dates
        </label>

        <div className="flex items-center gap-3">
          <button
            type="submit"
            disabled={mutation.isPending}
            className="px-4 py-2 bg-brand-600 text-white rounded-lg hover:bg-brand-700 text-sm font-medium disabled:opacity-50"
          >
            {mutation.isPending ? "Creating…" : "Create Public Holidays"}
          </button>

          {result && (
            <span className="text-sm text-emerald-600 dark:text-emerald-400">
              Created {result.created} entries{result.holidays ? ` (${result.holidays} holidays × ${result.resources ?? 0} resources)` : ""}
            </span>
          )}

          {mutation.error && (
            <span className="text-sm text-red-500">{mutation.error.message}</span>
          )}
        </div>
      </form>
    </div>
  );
}