import { useState, useEffect, useCallback } from 'react';
import { Search, Trash2, Heart, Image as ImageIcon, Eye, Clock, Activity, FileText, X, Dog, Cat, ShieldCheck } 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 ConfirmModal from '../components/ui/ConfirmModal';

export interface Pet {
  id: string;
  name: string;
  species?: string;
  type?: string;
  breed?: string;
  age?: number;
  weight?: number;
  activityLevel?: string;
  imageUrl?: string;
  avatarUrl?: string;
  user?: {
    firstName?: string;
    lastName?: string;
    name?: string;
    mobile?: string;
    email?: string;
  };
  medicalConditions?: Array<{ condition: string }>;
  reminders?: Array<{
    id: string;
    title: string;
    time: string;
    frequency: string;
  }>;
  healthLogs?: Array<{
    id: string;
    appetite: string;
    energy: string;
    digestion: string;
    note?: string;
    loggedDate: string;
    createdAt: string;
  }>;
  prescriptions?: Array<{
    id: string;
    status: string;
    notes?: string;
    adminNotes?: string;
    createdAt: string;
  }>;
  ownerName?: string;
  createdAt?: string;
}

export default function Pets() {
  const [pets, setPets] = useState<Pet[]>([]);
  const [isLoading, setIsLoading] = useState(true);
  const [search, setSearch] = useState('');
  const [page, setPage] = useState(1);
  const [totalPages, setTotalPages] = useState(1);
  const limit = 10;

  const [selectedPetForView, setSelectedPetForView] = useState<Pet | null>(null);
  const [deleteTargetId, setDeleteTargetId] = useState<string | null>(null);

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

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

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

  return (
    <div className="space-y-6 font-vazir text-right" dir="rtl">
      <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">
            <Heart className="w-6 h-6 text-purple-600 fill-purple-100" />
            حیوانات خانگی کاربران (Pets)
          </h2>
          <p className="text-gray-500 font-medium mt-1">مشاهده و پایش آنلاین سلامت، یادآورها، گزارش‌ها و نسخه‌های پزشکی پت‌ها</p>
        </div>
      </div>

      <div className="bg-white p-4 rounded-2xl shadow-xs 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 نام همدم..."
            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 text-xs font-bold"
          />
        </div>
      </div>

      <div className="bg-white rounded-2xl shadow-xs 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-xs font-black text-gray-500">تصویر</th>
                <th className="py-4 px-6 text-xs font-black text-gray-500">نام و نژاد</th>
                <th className="py-4 px-6 text-xs font-black text-gray-500">صاحب حیوان</th>
                <th className="py-4 px-6 text-xs font-black text-gray-500">مشخصات فیزیکی</th>
                <th className="py-4 px-6 text-xs font-black text-gray-500">سوابق سلامت</th>
                <th className="py-4 px-6 text-xs font-black text-gray-500 w-28">عملیات</th>
              </tr>
            </thead>
            <tbody className="divide-y divide-gray-100">
              {isLoading ? (
                <tr><td colSpan={6} className="py-12 text-center"><Spinner size="lg" className="mx-auto text-purple-600" /></td></tr>
              ) : pets.length === 0 ? (
                <tr><td colSpan={6} className="py-12 text-center text-gray-500 font-medium">هیچ حیوانی یافت نشد</td></tr>
              ) : (
                pets.map((pet) => (
                  <tr key={pet.id} className="hover:bg-gray-50/50 transition-colors">
                    <td className="py-3 px-6">
                      {pet.imageUrl ? (
                        <img src={pet.imageUrl.startsWith('http') ? pet.imageUrl : `${BASE_DOMAIN}${pet.imageUrl}`} alt={pet.name} className="w-12 h-12 rounded-2xl object-cover border-2 border-purple-100 shadow-xs" />
                      ) : (
                        <div className="w-12 h-12 rounded-2xl bg-purple-50 flex items-center justify-center text-purple-400 border border-purple-100">
                          {pet.type === 'گربه' ? <Cat className="w-6 h-6" /> : <Dog className="w-6 h-6" />}
                        </div>
                      )}
                    </td>
                    <td className="py-4 px-6">
                      <div className="font-black text-gray-900 flex items-center gap-1.5">
                        <span>{pet.name}</span>
                        <span className="text-[10px] px-2 py-0.5 bg-purple-50 text-purple-700 rounded-md font-bold">{pet.type || 'سگ'}</span>
                      </div>
                      <div className="text-gray-500 text-xs mt-0.5">{pet.breed || 'نژاد نامشخص'}</div>
                    </td>
                    <td className="py-4 px-6">
                      <div className="font-bold text-gray-800 text-xs">{pet.user?.firstName || ''} {pet.user?.lastName || ''}</div>
                      <div className="text-gray-400 text-[11px] font-mono mt-0.5">{pet.user?.mobile || pet.user?.email || '-'}</div>
                    </td>
                    <td className="py-4 px-6 text-gray-600 text-xs">
                      {pet.age ? `${pet.age} ساله` : 'سن نامشخص'}، {pet.weight ? `${pet.weight} کیلوگرم` : 'وزن نامشخص'}<br />
                      <span className="text-[11px] text-gray-400 font-medium">تحرک: {pet.activityLevel || 'متوسط'}</span>
                    </td>
                    <td className="py-4 px-6 text-xs">
                      <div className="flex flex-col gap-1">
                        <span className="text-[11px] text-gray-600 font-bold">
                          {pet.reminders?.length || 0} یادآور • {pet.healthLogs?.length || 0} گزارش
                        </span>
                        {pet.prescriptions && pet.prescriptions.length > 0 && (
                          <span className="text-[10px] text-purple-700 font-bold">
                            {pet.prescriptions.length} نسخه پزشکی ثبت شده
                          </span>
                        )}
                      </div>
                    </td>
                    <td className="py-4 px-6">
                      <div className="flex items-center gap-2">
                        <button
                          type="button"
                          onClick={() => setSelectedPetForView(pet)}
                          className="p-2 text-purple-600 hover:bg-purple-50 rounded-xl transition-colors cursor-pointer"
                          title="مشاهده پرونده کامل سلامت"
                        >
                          <Eye className="w-4 h-4" />
                        </button>
                        <button
                          type="button"
                          onClick={() => setDeleteTargetId(pet.id)}
                          className="p-2 text-red-500 hover:bg-red-50 rounded-xl transition-colors cursor-pointer"
                          title="حذف پت"
                        >
                          <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>

      {/* Pet Medical Dossier Details Modal */}
      {selectedPetForView && (
        <div className="fixed inset-0 z-50 flex items-center justify-center p-4 bg-black/60 backdrop-blur-xs font-vazir" dir="rtl">
          <div className="bg-white rounded-3xl max-w-2xl w-full max-h-[90vh] overflow-y-auto shadow-2xl border border-gray-100 flex flex-col">
            <div className="px-6 py-4 border-b border-gray-100 flex items-center justify-between sticky top-0 bg-white z-10">
              <div className="flex items-center gap-3">
                <div className="w-10 h-10 rounded-xl bg-purple-100 text-purple-700 flex items-center justify-center font-black">
                  {selectedPetForView.type === 'گربه' ? <Cat className="w-5 h-5" /> : <Dog className="w-5 h-5" />}
                </div>
                <div>
                  <h3 className="text-base font-black text-gray-900">پرونده پزشکی و پایش سلامت: {selectedPetForView.name}</h3>
                  <p className="text-xs text-gray-400 font-mono">شناسه: {selectedPetForView.id}</p>
                </div>
              </div>
              <button
                type="button"
                onClick={() => setSelectedPetForView(null)}
                className="p-2 text-gray-400 hover:text-red-500 hover:bg-red-50 rounded-xl transition-colors cursor-pointer"
              >
                <X className="w-5 h-5" />
              </button>
            </div>

            <div className="p-6 space-y-6">
              {/* Pet Info Banner */}
              <div className="p-4 bg-purple-50/60 rounded-2xl border border-purple-100 flex flex-col sm:flex-row items-start sm:items-center justify-between gap-4 text-xs">
                <div>
                  <div className="font-black text-gray-900 text-sm">{selectedPetForView.name} ({selectedPetForView.breed || selectedPetForView.type})</div>
                  <div className="text-gray-600 mt-1">
                    سرپرست: {selectedPetForView.user?.firstName} {selectedPetForView.user?.lastName} | همراه: <span className="font-mono">{selectedPetForView.user?.mobile || '-'}</span>
                  </div>
                </div>
                <div className="text-purple-900 font-bold bg-white px-3 py-1.5 rounded-xl border border-purple-200">
                  {selectedPetForView.age} سال | {selectedPetForView.weight} کیلوگرم | تحرک {selectedPetForView.activityLevel || 'متوسط'}
                </div>
              </div>

              {/* Medical Conditions */}
              <div>
                <h4 className="text-xs font-black text-gray-900 flex items-center gap-2 mb-2">
                  <ShieldCheck className="w-4 h-4 text-purple-600" />
                  سوابق و حساسیت‌های پزشکی (Medical Conditions)
                </h4>
                {selectedPetForView.medicalConditions && selectedPetForView.medicalConditions.length > 0 ? (
                  <div className="flex flex-wrap gap-2">
                    {selectedPetForView.medicalConditions.map((mc, idx) => (
                      <span key={idx} className="px-3 py-1 bg-gray-100 text-gray-800 text-xs font-bold rounded-xl border border-gray-200">
                        {mc.condition}
                      </span>
                    ))}
                  </div>
                ) : (
                  <p className="text-xs text-gray-400">مورد پزشکی خاصی ثبت نشده است.</p>
                )}
              </div>

              {/* Active Reminders */}
              <div>
                <h4 className="text-xs font-black text-gray-900 flex items-center gap-2 mb-2">
                  <Clock className="w-4 h-4 text-purple-600" />
                  یادآورهای فعال (Reminders)
                </h4>
                {selectedPetForView.reminders && selectedPetForView.reminders.length > 0 ? (
                  <div className="space-y-2">
                    {selectedPetForView.reminders.map((rem) => (
                      <div key={rem.id} className="p-3 bg-gray-50 rounded-xl border border-gray-200 flex items-center justify-between text-xs">
                        <span className="font-bold text-gray-800">{rem.title}</span>
                        <span className="text-purple-700 font-mono font-bold bg-white px-2 py-0.5 rounded-md border border-purple-100">
                          ساعت {rem.time} ({rem.frequency})
                        </span>
                      </div>
                    ))}
                  </div>
                ) : (
                  <p className="text-xs text-gray-400">یادآوری فعالی ثبت نشده است.</p>
                )}
              </div>

              {/* Health Logs */}
              <div>
                <h4 className="text-xs font-black text-gray-900 flex items-center gap-2 mb-2">
                  <Activity className="w-4 h-4 text-purple-600" />
                  آخرین گزارشات روزانه سلامت (Health Logs)
                </h4>
                {selectedPetForView.healthLogs && selectedPetForView.healthLogs.length > 0 ? (
                  <div className="space-y-2">
                    {selectedPetForView.healthLogs.map((log) => (
                      <div key={log.id} className="p-3 bg-gray-50 rounded-xl border border-gray-200 text-xs space-y-1">
                        <div className="flex items-center justify-between text-gray-500 font-bold">
                          <span>تاریخ: {new Date(log.loggedDate || log.createdAt).toLocaleDateString('fa-IR')}</span>
                          <span className="text-gray-700 font-black">اشتها: {log.appetite} | انرژی: {log.energy} | گوارش: {log.digestion}</span>
                        </div>
                        {log.note && <p className="text-gray-700 font-medium">{log.note}</p>}
                      </div>
                    ))}
                  </div>
                ) : (
                  <p className="text-xs text-gray-400">گزارش سلامتی ثبت نشده است.</p>
                )}
              </div>

              {/* Prescriptions */}
              <div>
                <h4 className="text-xs font-black text-gray-900 flex items-center gap-2 mb-2">
                  <FileText className="w-4 h-4 text-purple-600" />
                  نسخه‌های پزشکی این همدم (Prescriptions)
                </h4>
                {selectedPetForView.prescriptions && selectedPetForView.prescriptions.length > 0 ? (
                  <div className="space-y-2">
                    {selectedPetForView.prescriptions.map((rx) => (
                      <div key={rx.id} className="p-3 bg-purple-50/50 rounded-xl border border-purple-100 text-xs space-y-1">
                        <div className="flex items-center justify-between font-bold">
                          <span className="font-mono">نسخه #{rx.id.slice(0, 8)}</span>
                          <span className="text-purple-700 font-black">{rx.status}</span>
                        </div>
                        {rx.notes && <p className="text-gray-600">یادداشت کاربر: {rx.notes}</p>}
                        {rx.adminNotes && <p className="text-purple-900 font-bold">دستور پزشک: {rx.adminNotes}</p>}
                      </div>
                    ))}
                  </div>
                ) : (
                  <p className="text-xs text-gray-400">نسخه‌ای برای این پت ثبت نشده است.</p>
                )}
              </div>
            </div>
          </div>
        </div>
      )}

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