import 'package:didvan/models/enums.dart';
import 'package:didvan/providers/core_provider.dart';
import 'package:didvan/widgets/didvan/text.dart';
import 'package:flutter/material.dart';

class SliverStateHandler<T extends CoreProvier> extends SliverList {
  final T state;
  final Widget Function(BuildContext context, T state, int index) builder;
  final int childCount;
  final VoidCallback? onRefresh;
  final bool enableEmptyState;
  final Widget? emptyState;
  final Widget? placeholder;
  final EdgeInsets? itemPadding;
  SliverStateHandler({
    Key? key,
    required this.state,
    required this.builder,
    required this.childCount,
    this.itemPadding,
    this.placeholder,
    this.emptyState,
    this.enableEmptyState = false,
    this.onRefresh,
  }) : super(
          key: key,
          delegate: SliverChildBuilderDelegate(
            (context, index) {
              if (state.appState == AppState.failed) {
                return const DidvanText('مشکل اتصال');
              }
              if (enableEmptyState) {
                return emptyState;
              }
              if (state.appState == AppState.busy) {
                return Padding(
                  padding: itemPadding ?? const EdgeInsets.all(0),
                  child: placeholder,
                );
              }
              return Padding(
                padding: itemPadding ?? const EdgeInsets.all(0),
                child: builder(context, state, index),
              );
            },
            childCount: state.appState == AppState.idle
                ? childCount
                : state.appState == AppState.busy
                    ? 3
                    : 1,
          ),
        );
}