import 'package:flutter/material.dart';
import 'package:hooks_riverpod/hooks_riverpod.dart';

import 'app_state_card.dart';

/// Shared loading, failure and empty-state contract for feature pages.
class AsyncStateView<T> extends StatelessWidget {
  const AsyncStateView({
    super.key,
    required this.state,
    required this.data,
    this.isEmpty,
    this.empty,
    this.loading,
    this.onRetry,
    this.errorTitle = '加载失败',
    this.errorSubtitle = '请检查网络后重试',
    this.emptyIcon = Icons.inbox_outlined,
    this.emptyTitle = '暂无内容',
    this.emptySubtitle = '暂时没有可展示的数据',
  });

  final AsyncValue<T> state;
  final Widget Function(T value) data;
  final bool Function(T value)? isEmpty;
  final Widget Function()? empty;
  final Widget? loading;
  final VoidCallback? onRetry;
  final String errorTitle;
  final String errorSubtitle;
  final IconData emptyIcon;
  final String emptyTitle;
  final String emptySubtitle;

  @override
  Widget build(BuildContext context) {
    return state.when(
      loading: () =>
          loading ?? const Center(child: CircularProgressIndicator()),
      error: (_, _) => Center(
        child: AppStateCard(
          icon: Icons.error_outline,
          title: errorTitle,
          subtitle: errorSubtitle,
          buttonLabel: onRetry == null ? null : '重试',
          onButtonPressed: onRetry,
          buttonStyle: AppStateButtonStyle.filled,
        ),
      ),
      data: (value) => isEmpty?.call(value) == true
          ? empty?.call() ??
                Center(
                  child: AppStateCard(
                    icon: emptyIcon,
                    title: emptyTitle,
                    subtitle: emptySubtitle,
                  ),
                )
          : data(value),
    );
  }
}