// Author: fengshengxiong
// Date: 2024/5/7
// Description: 状态视图

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

/// 四种视图状态
enum ViewState { normal, error, loading, empty }

class ViewStateWidget extends StatelessWidget {
  const ViewStateWidget({super.key, required this.state, required this.child});

  final ViewState state;
  final Widget child;

  @override
  Widget build(BuildContext context) {
    switch (state) {
      case ViewState.normal:
        return child;
      case ViewState.loading:
        return loadingView();
      case ViewState.error:
        return errorView;
      case ViewState.empty:
        return emptyView;
    }
  }
}

/// 加载中视图
Widget loadingView({
  Color? color,
  Animation<Color?>? valueColor,
  Color? backgroundColor,
  double? value,
}) {
  return Center(
    child: CircularProgressIndicator(
      color: color,
      valueColor: valueColor,
      backgroundColor: backgroundColor ?? Colors.grey,
      value: value,
    ),
  );
}

/// 空视图
Widget get emptyView {
  return Center(
    child: Text(
      'No data available',
      textAlign: TextAlign.center,
      style: TextStyle(
        color: Colors.white,
        fontSize: 14.sp,
      ),
    ),
  );
}

/// 错误视图
Widget get errorView {
  return Center(
    child: Text(
      'An error occurred, please try again later',
      textAlign: TextAlign.center,
      style: TextStyle(
        color: Colors.white,
        fontSize: 14.sp,
      ),
    ),
  );
}