// lib/core/widgets/data_handler.dart

import 'package:flutter/material.dart';
import 'package:flutter_screenutil/flutter_screenutil.dart';
import 'package:smpn1_lengkong/core/constants/app_colors.dart';

class DataHandler extends StatelessWidget {
  final AsyncSnapshot snapshot;
  final Widget child;
  final VoidCallback onRetry;
  final Future<void> Function() onRefresh;
  final String? emptyMessage;

  const DataHandler({
    super.key,
    required this.snapshot,
    required this.child,
    required this.onRetry,
    required this.onRefresh,
    this.emptyMessage,
  });

  @override
  Widget build(BuildContext context) {
    // 1. KONDISI LOADING: Muncul saat halaman pertama kali dibuka
    if (snapshot.connectionState == ConnectionState.waiting) {
      return const Center(
        child: CircularProgressIndicator(color: AppColors.primaryBlue),
      );
    }

    // 2. KONDISI ERROR: Muncul jika gagal koneksi/timeout saat inisialisasi
    if (snapshot.hasError) {
      return RefreshIndicator(
        onRefresh: onRefresh,
        color: AppColors.primaryBlue,
        child: SingleChildScrollView(
          physics: const AlwaysScrollableScrollPhysics(),
          child: Container(
            height: 0.7.sh, // Mengambil 70% tinggi layar
            padding: EdgeInsets.all(24.w),
            alignment: Alignment.center,
            child: Column(
              mainAxisAlignment: MainAxisAlignment.center,
              children: [
                Icon(
                  Icons.wifi_off_rounded,
                  size: 80.sp,
                  color: Colors.grey[400],
                ),
                SizedBox(height: 16.h),
                Text(
                  "Koneksi Bermasalah",
                  style: TextStyle(
                    fontSize: 18.sp,
                    fontWeight: FontWeight.bold,
                    color: AppColors.textPrimary,
                  ),
                ),
                SizedBox(height: 8.h),
                Text(
                  "Gagal mengambil data dari server. Periksa internet Anda atau tarik layar untuk mencoba lagi.",
                  textAlign: TextAlign.center,
                  style: TextStyle(
                    color: AppColors.textSecondary,
                    fontSize: 14.sp,
                  ),
                ),
                SizedBox(height: 24.h),
                ElevatedButton.icon(
                  onPressed: onRetry,
                  icon: const Icon(Icons.refresh_rounded),
                  label: const Text("Coba Lagi"),
                  style: ElevatedButton.styleFrom(
                    backgroundColor: AppColors.primaryBlue,
                    foregroundColor: Colors.white,
                    padding: EdgeInsets.symmetric(
                      horizontal: 24.w,
                      vertical: 12.h,
                    ),
                    shape: RoundedRectangleBorder(
                      borderRadius: BorderRadius.circular(10.r),
                    ),
                  ),
                ),
              ],
            ),
          ),
        ),
      );
    }

    // 3. KONDISI KOSONG: Jika data berhasil diambil tapi list-nya kosong
    final data = snapshot.data;
    if (data is List && data.isEmpty) {
      return RefreshIndicator(
        onRefresh: onRefresh,
        child: SingleChildScrollView(
          physics: const AlwaysScrollableScrollPhysics(),
          child: Container(
            height: 0.7.sh,
            alignment: Alignment.center,
            child: Text(
              emptyMessage ?? "Data tidak ditemukan",
              style: TextStyle(color: Colors.grey, fontSize: 14.sp),
            ),
          ),
        ),
      );
    }

    // 4. KONDISI SUKSES: Menampilkan konten asli dengan RefreshIndicator
    return RefreshIndicator(
      onRefresh: onRefresh,
      color: AppColors.primaryBlue,
      backgroundColor: Colors.white,
      child: child,
    );
  }
}