import { useState } from 'react';
import { FolderCog, Pencil, Plus, Trash2 } from 'lucide-react';
import Modal from './Modal.jsx';

const PRESET_COLORS = ['#7C3AED', '#2563EB', '#D97706', '#059669', '#DC2626', '#0F766E', '#9333EA', '#475569'];

function CategoryForm({ initial, suggestedSortOrder, onSave, onClose }) {
  const [name, setName] = useState(initial?.name ?? '');
  const [color, setColor] = useState(initial?.color ?? PRESET_COLORS[0]);
  const [sortOrder, setSortOrder] = useState(initial?.sort_order ?? suggestedSortOrder ?? 1);

  function submit(e) {
    e.preventDefault();
    if (!name.trim()) return;

    onSave({
      name: name.trim(),
      color,
      sort_order: parseInt(sortOrder) || suggestedSortOrder || 1,
    });
    onClose();
  }

  return (
    <form onSubmit={submit} className="space-y-3">
      <div>
        <label className="block text-sm font-medium text-slate-700 mb-1">Namn</label>
        <input
          className="w-full border border-slate-200 rounded-xl px-3 py-2 text-sm focus:outline-none focus:ring-2 focus:ring-blue-500"
          value={name}
          onChange={e => setName(e.target.value)}
          placeholder="t.ex. Försäkringar"
          required
          autoFocus
        />
      </div>

      <div>
        <label className="block text-sm font-medium text-slate-700 mb-2">Färg</label>
        <div className="flex flex-wrap gap-2">
          {PRESET_COLORS.map(option => (
            <button
              key={option}
              type="button"
              onClick={() => setColor(option)}
              className={`w-8 h-8 rounded-full border-2 ${color === option ? 'border-slate-800' : 'border-transparent'}`}
              style={{ backgroundColor: option }}
              aria-label={`Välj färg ${option}`}
            />
          ))}
        </div>
      </div>

      <div>
        <label className="block text-sm font-medium text-slate-700 mb-1">Sorteringsordning</label>
        <input
          type="number"
          min="1"
          className="w-full border border-slate-200 rounded-xl px-3 py-2 text-sm focus:outline-none focus:ring-2 focus:ring-blue-500"
          value={sortOrder}
          onChange={e => setSortOrder(e.target.value)}
        />
      </div>

      <div className="flex gap-2 pt-1">
        <button type="button" onClick={onClose} className="flex-1 py-2.5 rounded-xl border border-slate-200 text-sm font-medium text-slate-600 hover:bg-slate-50">
          Avbryt
        </button>
        <button type="submit" className="flex-1 py-2.5 rounded-xl bg-blue-600 text-white text-sm font-medium hover:bg-blue-700">
          Spara
        </button>
      </div>
    </form>
  );
}

export default function CategorySettingsSection({ categories, onAdd, onUpdate, onDelete, deleteError }) {
  const [modal, setModal] = useState(null);
  const suggestedSortOrder = (categories.at(-1)?.sort_order ?? 0) + 1;

  return (
    <section className="bg-white rounded-2xl shadow-sm border border-slate-200 overflow-hidden mb-3">
      <div className="flex items-center justify-between px-4 py-3 border-b border-slate-100">
        <div className="flex items-center gap-2">
          <FolderCog size={16} className="text-emerald-600" />
          <span className="font-semibold text-slate-700 text-sm uppercase tracking-wide">Kategorier</span>
        </div>
        <button
          onClick={() => setModal('add')}
          className="flex items-center gap-1 text-blue-600 text-xs font-medium hover:text-blue-700"
        >
          <Plus size={14} /> Lägg till
        </button>
      </div>

      <div className="px-4 py-3 border-b border-slate-100 bg-emerald-50/70 text-sm text-slate-600">
        Här skapar och ändrar du kategorierna som används i budgeten, transaktionerna och AI-förslagen. Byter du namn eller färg här följer det med i hela appen.
      </div>

      {deleteError && (
        <div className="mx-4 mt-4 rounded-xl border border-amber-200 bg-amber-50 px-3 py-2 text-sm text-amber-800">
          {deleteError}
        </div>
      )}

      <div className="divide-y divide-slate-50">
        {categories.map(category => (
          <div key={category.id} className="flex items-center gap-3 px-4 py-3 group">
            <span className="w-3 h-3 rounded-full shrink-0" style={{ backgroundColor: category.color }} />
            <div className="flex-1 min-w-0">
              <div className="text-sm font-medium text-slate-800">{category.name}</div>
              <div className="text-xs text-slate-500">Ordning {category.sort_order}</div>
            </div>
            <div className="flex gap-1 opacity-100 sm:opacity-0 sm:group-hover:opacity-100 transition-opacity shrink-0">
              <button onClick={() => setModal({ edit: category })} className="p-1 rounded hover:bg-slate-100 text-slate-400">
                <Pencil size={13} />
              </button>
              <button onClick={() => onDelete(category.id)} className="p-1 rounded hover:bg-red-50 text-slate-400 hover:text-red-500">
                <Trash2 size={13} />
              </button>
            </div>
          </div>
        ))}
      </div>

      {modal === 'add' && (
        <Modal title="Lägg till kategori" onClose={() => setModal(null)}>
          <CategoryForm
            suggestedSortOrder={suggestedSortOrder}
            onSave={onAdd}
            onClose={() => setModal(null)}
          />
        </Modal>
      )}

      {modal?.edit && (
        <Modal title="Redigera kategori" onClose={() => setModal(null)}>
          <CategoryForm
            initial={modal.edit}
            suggestedSortOrder={modal.edit.sort_order}
            onSave={data => onUpdate(modal.edit.id, data)}
            onClose={() => setModal(null)}
          />
        </Modal>
      )}
    </section>
  );
}