import { useState, useEffect } from 'react';
import { Search, Plus, Edit2, Trash2, BookOpen, XCircle } from 'lucide-react';
import api from '../services/api';
import Spinner from '../components/ui/Spinner';
import Pagination from '../components/ui/Pagination';

export default function Wiki() {
  const [terms, setTerms] = useState<any[]>([]);
  const [isLoading, setIsLoading] = useState(true);
  const [search, setSearch] = useState('');
  const [page, setPage] = useState(1);
  const [totalPages, setTotalPages] = useState(1);
  const limit = 10;

  const [isModalOpen, setIsModalOpen] = useState(false);
  const [editingTerm, setEditingTerm] = useState<any>(null);

  const [formData, setFormData] = useState({
    key: '',
    term: '',
    definition: '',
    wikiId: 'general',
    metaTitle: '',
    metaDescription: '',
    keywords: ''
  });

  const fetchTerms = async () => {
    try {
      setIsLoading(true);
      const res = await api.get('/admin/wiki', { params: { page, limit, search } });
      if (res.data?.data) {
        setTerms(res.data.data);
        setTotalPages(res.data.meta?.lastPage || 1);
      }
    } catch (err) {
      console.error(err);
    } finally {
      setIsLoading(false);
    }
  };

  useEffect(() => {
    const timer = setTimeout(() => {
      fetchTerms();
    }, 500);
    return () => clearTimeout(timer);
  }, [search, page]);

  const handleSave = async (e: React.FormEvent) => {
    e.preventDefault();
    try {
      if (editingTerm) {
        await api.put(`/admin/wiki/${editingTerm.key}`, formData);
      } else {
        await api.post('/admin/wiki', formData);
      }
      setIsModalOpen(false);
      fetchTerms();
    } catch (error) {
      console.error('Save failed', error);
      alert('خطا در ذخیره اصطلاح علمی. ممکن است کلید تکراری باشد.');
    }
  };

  const handleDelete = async (key: string) => {
    if (!window.confirm('آیا از حذف این مورد مطمئن هستید؟')) return;
    try {
      await api.delete(`/admin/wiki/${key}`);
      fetchTerms();
    } catch (error) {
      console.error('Delete failed', error);
    }
  };

  const openModal = (term: any = null) => {
    if (term) {
      setEditingTerm(term);
      setFormData({
        key: term.key,
        term: term.term,
        definition: term.definition,
        wikiId: term.wikiId,
        metaTitle: term.metaTitle || '',
        metaDescription: term.metaDescription || '',
        keywords: term.keywords || ''
      });
    } else {
      setEditingTerm(null);
      setFormData({
        key: '', term: '', definition: '', wikiId: 'general', metaTitle: '', metaDescription: '', keywords: ''
      });
    }
    setIsModalOpen(true);
  };

  return (
    <div className="space-y-6">
      <div className="flex flex-col sm:flex-row justify-between gap-4">
        <div>
          <h2 className="text-2xl font-black text-gray-900 flex items-center gap-2">
            <BookOpen className="w-6 h-6 text-purple-600" />
            دانشنامه کانینا (Wiki)
          </h2>
          <p className="text-gray-500 font-medium mt-1">مدیریت اصطلاحات علمی، مواد تشکیل‌دهنده و خواص درمانی</p>
        </div>
        <button
          onClick={() => openModal()}
          className="bg-purple-600 hover:bg-purple-700 text-white px-5 py-2.5 rounded-xl flex items-center gap-2 font-bold transition-all shadow-md shadow-purple-200"
        >
          <Plus className="w-5 h-5" />
          مفهوم جدید
        </button>
      </div>

      <div className="bg-white p-4 rounded-2xl shadow-sm border border-gray-200 flex flex-col sm:flex-row gap-4">
        <div className="relative flex-1">
          <Search className="w-5 h-5 absolute right-4 top-1/2 -translate-y-1/2 text-gray-400" />
          <input
            type="text"
            placeholder="جستجو در اصطلاحات..."
            value={search}
            onChange={(e) => { setSearch(e.target.value); setPage(1); }}
            className="w-full pl-4 pr-12 py-3 rounded-xl border border-gray-200 focus:border-purple-500 outline-none transition-all"
          />
        </div>
      </div>

      <div className="bg-white rounded-2xl shadow-sm border border-gray-200 overflow-hidden">
        <div className="overflow-x-auto">
          <table className="w-full text-right">
            <thead className="bg-gray-50 border-b border-gray-100">
              <tr>
                <th className="py-4 px-6 text-sm font-bold text-gray-500">شناسه (Key)</th>
                <th className="py-4 px-6 text-sm font-bold text-gray-500">اصطلاح علمی</th>
                <th className="py-4 px-6 text-sm font-bold text-gray-500">محتوا (چکیده)</th>
                <th className="py-4 px-6 text-sm font-bold text-gray-500 w-24">عملیات</th>
              </tr>
            </thead>
            <tbody className="divide-y divide-gray-100">
              {isLoading ? (
                <tr><td colSpan={4} className="py-12 text-center"><Spinner size="lg" className="mx-auto text-purple-600" /></td></tr>
              ) : terms.length === 0 ? (
                <tr><td colSpan={4} className="py-12 text-center text-gray-500 font-medium">هیچ رکوردی یافت نشد</td></tr>
              ) : (
                terms.map((t) => (
                  <tr key={t.key} className="hover:bg-gray-50/50 transition-colors">
                    <td className="py-4 px-6 text-gray-500 font-mono text-sm">{t.key}</td>
                    <td className="py-4 px-6 font-bold text-gray-900">{t.term}</td>
                    <td className="py-4 px-6 text-gray-500 text-sm max-w-xs truncate">{t.definition}</td>
                    <td className="py-4 px-6">
                      <div className="flex items-center gap-2">
                        <button onClick={() => openModal(t)} className="p-2 text-blue-600 hover:bg-blue-50 rounded-lg transition-colors"><Edit2 className="w-4 h-4" /></button>
                        <button onClick={() => handleDelete(t.key)} className="p-2 text-red-600 hover:bg-red-50 rounded-lg transition-colors"><Trash2 className="w-4 h-4" /></button>
                      </div>
                    </td>
                  </tr>
                ))
              )}
            </tbody>
          </table>
        </div>
        {!isLoading && totalPages > 1 && (
          <div className="p-4 border-t border-gray-100 flex justify-center bg-gray-50/50">
            <Pagination currentPage={page} totalPages={totalPages} onPageChange={setPage} />
          </div>
        )}
      </div>

      {isModalOpen && (
        <div className="fixed inset-0 z-50 flex items-center justify-center p-4 bg-gray-900/60 backdrop-blur-sm">
          <div className="bg-white rounded-2xl w-full max-w-2xl max-h-[95vh] flex flex-col shadow-2xl animate-in zoom-in duration-200">
            <div className="px-6 py-4 border-b border-gray-100 flex justify-between items-center bg-gray-50/50">
              <h3 className="text-xl font-bold text-gray-900">
                {editingTerm ? 'ویرایش دانشنامه' : 'افزودن مفهوم جدید'}
              </h3>
              <button onClick={() => setIsModalOpen(false)} className="text-gray-400 hover:text-red-500 transition-colors">
                <XCircle className="w-6 h-6" />
              </button>
            </div>

            <div className="p-6 overflow-y-auto flex-1">
              <form id="wikiForm" onSubmit={handleSave} className="space-y-6">
                <div className="grid grid-cols-1 md:grid-cols-2 gap-4">
                  <div className="space-y-2">
                    <label className="text-sm font-bold text-gray-700">شناسه یکتا (Key) *</label>
                    <input required type="text" value={formData.key} disabled={!!editingTerm} dir="ltr" onChange={(e) => setFormData({ ...formData, key: e.target.value })} className="w-full px-4 py-3 rounded-xl border border-gray-200 focus:border-purple-500 outline-none font-mono text-sm disabled:bg-gray-100" />
                  </div>
                  <div className="space-y-2">
                    <label className="text-sm font-bold text-gray-700">نام اصطلاح (Term) *</label>
                    <input required type="text" value={formData.term} onChange={(e) => setFormData({ ...formData, term: e.target.value })} className="w-full px-4 py-3 rounded-xl border border-gray-200 focus:border-purple-500 outline-none" />
                  </div>
                </div>

                <div className="space-y-2">
                  <label className="text-sm font-bold text-gray-700">توضیح علمی *</label>
                  <textarea required value={formData.definition} onChange={(e) => setFormData({ ...formData, definition: e.target.value })} rows={5} className="w-full px-4 py-3 rounded-xl border border-gray-200 focus:border-purple-500 outline-none"></textarea>
                </div>

                <div className="space-y-4 border border-gray-200 p-4 rounded-xl bg-gray-50/50">
                  <h4 className="font-bold text-purple-700 text-sm mb-2">تنظیمات سئو (SEO)</h4>
                  <div className="space-y-2">
                    <label className="text-xs font-bold text-gray-700">عنوان متا</label>
                    <input type="text" value={formData.metaTitle} onChange={(e) => setFormData({ ...formData, metaTitle: e.target.value })} className="w-full px-3 py-2 rounded-lg border border-gray-200 focus:border-purple-500 outline-none text-sm" />
                  </div>
                  <div className="space-y-2">
                    <label className="text-xs font-bold text-gray-700">کلمات کلیدی</label>
                    <input type="text" value={formData.keywords} onChange={(e) => setFormData({ ...formData, keywords: e.target.value })} className="w-full px-3 py-2 rounded-lg border border-gray-200 focus:border-purple-500 outline-none text-sm" />
                  </div>
                  <div className="space-y-2">
                    <label className="text-xs font-bold text-gray-700">توضیحات متا</label>
                    <textarea rows={2} value={formData.metaDescription} onChange={(e) => setFormData({ ...formData, metaDescription: e.target.value })} className="w-full px-3 py-2 rounded-lg border border-gray-200 focus:border-purple-500 outline-none text-sm"></textarea>
                  </div>
                </div>

              </form>
            </div>

            <div className="p-4 border-t border-gray-100 bg-gray-50 flex justify-end gap-3 rounded-b-2xl">
              <button type="button" onClick={() => setIsModalOpen(false)} className="px-5 py-2.5 rounded-xl font-bold text-gray-600 hover:bg-gray-200 transition-colors">انصراف</button>
              <button type="submit" form="wikiForm" className="bg-purple-600 hover:bg-purple-700 text-white px-8 py-2.5 rounded-xl font-bold transition-all shadow-md shadow-purple-200">ذخیره</button>
            </div>
          </div>
        </div>
      )}
    </div>
  );
}