'use client';

import { useEffect, useRef, useState } from 'react';
import type { ObjektOption, SelectedObjekt } from '@/types/logbuch';

interface Props {
  selected: SelectedObjekt[];
  onChange: (objekte: SelectedObjekt[]) => void;
}

export default function ObjektSelector({ selected, onChange }: Props) {
  const [all, setAll] = useState<ObjektOption[]>([]);
  const [search, setSearch] = useState('');
  const [dropdownOpen, setDropdownOpen] = useState(false);
  const [newName, setNewName] = useState('');
  const [showNewInput, setShowNewInput] = useState(false);
  const wrapperRef = useRef<HTMLDivElement>(null);

  useEffect(() => {
    fetch('/api/objekte')
      .then((r) => { if (!r.ok) throw new Error('Fehler'); return r.json(); })
      .then(setAll)
      .catch(() => {});
  }, []);

  useEffect(() => {
    function handleOutside(e: MouseEvent) {
      if (wrapperRef.current && !wrapperRef.current.contains(e.target as Node)) {
        setDropdownOpen(false);
      }
    }
    if (dropdownOpen) document.addEventListener('mousedown', handleOutside);
    return () => document.removeEventListener('mousedown', handleOutside);
  }, [dropdownOpen]);

  const selectedNames = new Set(selected.map((o) => o.Name.toLowerCase()));
  const available = all.filter((o) => !selectedNames.has(o.Name.toLowerCase()));
  const filtered = search
    ? available.filter((o) => o.Name.toLowerCase().startsWith(search.toLowerCase()))
    : available;

  function add(obj: ObjektOption) {
    onChange([...selected, { ID: obj.ID, Name: obj.Name }]);
    setSearch('');
    setDropdownOpen(false);
  }

  function addNew() {
    const name = newName.trim();
    if (!name || selectedNames.has(name.toLowerCase())) return;
    const existing = all.find((o) => o.Name.toLowerCase() === name.toLowerCase());
    if (existing) {
      onChange([...selected, { ID: existing.ID, Name: existing.Name }]);
    } else {
      onChange([...selected, { ID: null, Name: name }]);
    }
    setNewName('');
    setShowNewInput(false);
  }

  function remove(name: string) {
    onChange(selected.filter((o) => o.Name !== name));
  }

  return (
    <div className="space-y-3">
      <div className="flex flex-wrap gap-2">
        {selected.map((o) => (
          <span
            key={o.Name}
            className="inline-flex items-center gap-2 bg-green-100 text-green-800 text-base px-3 py-1.5 rounded-full"
          >
            {o.Name}
            <button
              type="button"
              onClick={() => remove(o.Name)}
              className="flex items-center justify-center w-7 h-7 rounded-full text-green-600 hover:bg-red-100 hover:text-red-600 font-bold text-xl leading-none"
              aria-label={`${o.Name} entfernen`}
            >
              ×
            </button>
          </span>
        ))}
      </div>

      <div className="flex gap-2">
        {available.length > 0 && (
          <div ref={wrapperRef} className="relative flex-1">
            <input
              type="text"
              value={search}
              onChange={(e) => { setSearch(e.target.value); setDropdownOpen(true); }}
              onFocus={() => setDropdownOpen(true)}
              placeholder="Objekt suchen..."
              className="w-full px-3 py-2 border-2 border-gray-400 rounded-lg bg-white text-sm text-gray-900 focus:border-blue-500 focus:outline-none"
            />
            {dropdownOpen && filtered.length > 0 && (
              <div className="absolute z-50 left-0 right-0 mt-1 bg-white border-2 border-gray-400 rounded-lg shadow-lg max-h-60 overflow-y-auto">
                {filtered.map((o) => (
                  <button
                    key={o.ID}
                    type="button"
                    onClick={() => add(o)}
                    className="w-full text-left px-4 py-2 text-sm text-gray-900 hover:bg-blue-50 active:bg-blue-100 border-b border-gray-100 last:border-0"
                  >
                    {o.Name}
                  </button>
                ))}
              </div>
            )}
          </div>
        )}
        <button
          type="button"
          onClick={() => setShowNewInput((v) => !v)}
          className="px-4 py-2 border-2 border-gray-400 rounded-lg bg-white text-sm text-gray-700 hover:bg-gray-50 whitespace-nowrap"
        >
          + Neu
        </button>
      </div>

      {showNewInput && (
        <div className="flex gap-2">
          <input
            type="text"
            value={newName}
            onChange={(e) => setNewName(e.target.value)}
            onKeyDown={(e) => { if (e.key === 'Enter') { e.preventDefault(); addNew(); } }}
            placeholder="Objektname eingeben"
            className="flex-1 px-3 py-2 border-2 border-gray-400 rounded-lg bg-white text-sm focus:border-blue-500 focus:outline-none"
            autoFocus
          />
          <button
            type="button"
            onClick={addNew}
            className="px-4 py-2 bg-green-600 text-white text-sm rounded-lg hover:bg-green-700"
          >
            OK
          </button>
          <button
            type="button"
            onClick={() => { setShowNewInput(false); setNewName(''); }}
            className="px-4 py-2 bg-gray-200 text-gray-700 text-sm rounded-lg hover:bg-gray-300"
          >
            ✕
          </button>
        </div>
      )}
    </div>
  );
}
