import { useState, useEffect, useCallback } from 'react';
import { Search, Plus, Edit2, Trash2, FileText, Image as ImageIcon, CheckCircle2, XCircle } from 'lucide-react';
import { toast } from 'react-hot-toast';
import api, { BASE_DOMAIN } from '../services/api';
import Spinner from '../components/ui/Spinner';
import Pagination from '../components/ui/Pagination';
import MediaSelector from '../components/ui/MediaSelector';
import ConfirmModal from '../components/ui/ConfirmModal';

export interface BlogPost {
  author?: {
    firstName?: string;
    lastName?: string;
  };
  id: string;
  title: string;
  slug: string;
  content: string;
  isPublished: boolean;
  metaTitle?: string;
  metaDescription?: string;
  keywords?: string;
  imageUrl?: string;
  createdAt?: string;
}

export default function Blogs() {
  const [blogs, setBlogs] = useState<BlogPost[]>([]);
  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 [isMediaSelectorOpen, setIsMediaSelectorOpen] = useState(false);
  const [editingBlog, setEditingBlog] = useState<BlogPost | null>(null);
  const [deleteTargetId, setDeleteTargetId] = useState<string | null>(null);

  const [formData, setFormData] = useState({
    title: '',
    slug: '',
    content: '',
    isPublished: true,
    metaTitle: '',
    metaDescription: '',
    keywords: '',
    imageUrl: ''
  });

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

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

  const handleSave = async (e: React.FormEvent) => {
    e.preventDefault();
    try {
      if (editingBlog) {
        await api.put(`/admin/blogs/${editingBlog.id}`, formData);
        toast.success('مقاله با موفقیت ویرایش شد');
      } else {
        await api.post('/admin/blogs', formData);
        toast.success('مقاله جدید با موفقیت ذخیره شد');
      }
      setIsModalOpen(false);
      fetchBlogs();
    } catch (error) {
      console.error('Save failed', error);
      toast.error('خطا در ذخیره مقاله');
    }
  };

  const confirmDelete = async () => {
    if (!deleteTargetId) return;
    try {
      await api.delete(`/admin/blogs/${deleteTargetId}`);
      toast.success('مقاله با موفقیت حذف شد');
      fetchBlogs();
    } catch (error) {
      console.error('Delete failed', error);
      toast.error('خطا در حذف مقاله');
    } finally {
      setDeleteTargetId(null);
    }
  };

  const openModal = (blog: BlogPost | null = null) => {
    if (blog) {
      setEditingBlog(blog);
      setFormData({
        title: blog.title,
        slug: blog.slug,
        content: blog.content,
        isPublished: blog.isPublished,
        metaTitle: blog.metaTitle || '',
        metaDescription: blog.metaDescription || '',
        keywords: blog.keywords || '',
        imageUrl: blog.imageUrl || ''
      });
    } else {
      setEditingBlog(null);
      setFormData({
        title: '', slug: '', content: '', isPublished: true, metaTitle: '', metaDescription: '', keywords: '', imageUrl: ''
      });
    }
    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">
            <FileText className="w-6 h-6 text-purple-600" />
            وبلاگ و مقالات
          </h2>
          <p className="text-gray-500 font-medium mt-1">مدیریت محتوای آموزشی و مقالات علمی سایت</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" />
          مقاله 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 مقالات..."
            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">تصویر</th>
                <th className="py-4 px-6 text-sm font-bold text-gray-500">عنوان مقاله</th>
                <th className="py-4 px-6 text-sm font-bold text-gray-500">نویسنده</th>
                <th className="py-4 px-6 text-sm font-bold text-gray-500">وضعیت انتشار</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={5} className="py-12 text-center"><Spinner size="lg" className="mx-auto text-purple-600" /></td></tr>
              ) : blogs.length === 0 ? (
                <tr><td colSpan={5} className="py-12 text-center text-gray-500 font-medium">هیچ مقاله‌ای یافت نشد</td></tr>
              ) : (
                blogs.map((blog) => (
                  <tr key={blog.id} className="hover:bg-gray-50/50 transition-colors">
                    <td className="py-3 px-6">
                      {blog.imageUrl ? (
                        <img src={blog.imageUrl.startsWith('http') ? blog.imageUrl : `${BASE_DOMAIN}${blog.imageUrl}`} alt="blog" className="w-16 h-10 rounded-lg object-cover border border-gray-200" />
                      ) : (
                        <div className="w-16 h-10 rounded-lg bg-gray-100 flex items-center justify-center text-gray-400">
                          <ImageIcon className="w-4 h-4" />
                        </div>
                      )}
                    </td>
                    <td className="py-4 px-6 font-bold text-gray-900">{blog.title}</td>
                    <td className="py-4 px-6 text-gray-500 text-sm">{(blog.author?.firstName && blog.author?.lastName) ? `${blog.author.firstName} ${blog.author.lastName}` : 'نامشخص'}</td>
                    <td className="py-4 px-6">
                      {blog.isPublished ? (
                        <span className="flex items-center gap-1 text-green-600 text-sm font-bold"><CheckCircle2 className="w-4 h-4" />منتشر شده</span>
                      ) : (
                        <span className="flex items-center gap-1 text-orange-600 text-sm font-bold"><XCircle className="w-4 h-4" />پیش‌نویس</span>
                      )}
                    </td>
                    <td className="py-4 px-6">
                      <div className="flex items-center gap-2">
                        <button onClick={() => openModal(blog)} className="p-2 text-blue-600 hover:bg-blue-50 rounded-lg transition-colors"><Edit2 className="w-4 h-4" /></button>
                        <button onClick={() => setDeleteTargetId(blog.id)} 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-4xl 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">
                {editingBlog ? 'ویرایش مقاله' : 'افزودن مقاله 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="blogForm" 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">عنوان مقاله *</label>
                    <input required type="text" value={formData.title} onChange={(e) => setFormData({ ...formData, title: e.target.value })} className="w-full px-4 py-3 rounded-xl border border-gray-200 focus:border-purple-500 outline-none" />
                  </div>
                  <div className="space-y-2">
                    <label className="text-sm font-bold text-gray-700">اسلاگ (Slug) *</label>
                    <input required type="text" value={formData.slug} dir="ltr" onChange={(e) => setFormData({ ...formData, slug: 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" />
                  </div>
                </div>

                <div className="space-y-2">
                  <label className="text-sm font-bold text-gray-700">محتوای اصلی مقاله *</label>
                  <textarea required value={formData.content} onChange={(e) => setFormData({ ...formData, content: e.target.value })} rows={10} className="w-full px-4 py-3 rounded-xl border border-gray-200 focus:border-purple-500 outline-none font-mono text-sm" dir="rtl" placeholder="محتوای مقاله (متن ساده یا HTML)"></textarea>
                </div>

                <div className="grid grid-cols-1 md:grid-cols-2 gap-6">
                  <div className="space-y-4">
                    <label className="text-sm font-bold text-gray-700">تصویر شاخص</label>
                    <div className="flex items-center gap-4">
                      {formData.imageUrl ? (
                        <img src={formData.imageUrl.startsWith('http') ? formData.imageUrl : `${BASE_DOMAIN}${formData.imageUrl}`} alt="preview" className="w-24 h-16 rounded-xl object-cover border border-gray-200" />
                      ) : (
                        <div className="w-24 h-16 rounded-xl bg-gray-100 flex items-center justify-center text-gray-400">
                          <ImageIcon className="w-6 h-6" />
                        </div>
                      )}
                      <button type="button" onClick={() => setIsMediaSelectorOpen(true)} className="px-4 py-2 border-2 border-dashed border-gray-300 rounded-xl text-gray-600 font-bold hover:border-purple-500 hover:text-purple-600">انتخاب از گالری</button>
                    </div>
                    <label className="flex items-center gap-3 cursor-pointer p-4 border border-gray-200 rounded-xl hover:bg-gray-50 transition-colors">
                      <input type="checkbox" checked={formData.isPublished} onChange={(e) => setFormData({ ...formData, isPublished: e.target.checked })} className="w-5 h-5 text-purple-600 rounded focus:ring-purple-500" />
                      <span className="font-bold text-gray-700">انتشار فوری در سایت</span>
                    </label>
                  </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>
                </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="blogForm" 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 مقاله</button>
            </div>
          </div>
        </div>
      )}

      <MediaSelector isOpen={isMediaSelectorOpen} onClose={() => setIsMediaSelectorOpen(false)} onSelect={(url) => setFormData({ ...formData, imageUrl: url })} />

      <ConfirmModal
        isOpen={!!deleteTargetId}
        title="حذف مقاله"
        message="آیا از حذف این مقاله مطمئن هستید؟ این عملیات قابل بازگشت نیست."
        onConfirm={confirmDelete}
        onCancel={() => setDeleteTargetId(null)}
      />
    </div>
  );
}