lunchpick/lib/core/widgets/loading_indicator.dart

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

/// 로딩 인디케이터 위젯
/// 
/// 앱 전체에서 일관된 로딩 표시를 위한 공통 위젯
class LoadingIndicator extends StatelessWidget {
  /// 로딩 메시지 (선택사항)
  final String? message;
  
  /// 인디케이터 크기
  final double size;
  
  /// 스트로크 너비
  final double strokeWidth;

  const LoadingIndicator({
    super.key,
    this.message,
    this.size = 40.0,
    this.strokeWidth = 4.0,
  });

  @override
  Widget build(BuildContext context) {
    final isDark = Theme.of(context).brightness == Brightness.dark;
    
    return Center(
      child: Column(
        mainAxisAlignment: MainAxisAlignment.center,
        mainAxisSize: MainAxisSize.min,
        children: [
          SizedBox(
            width: size,
            height: size,
            child: CircularProgressIndicator(
              strokeWidth: strokeWidth,
              valueColor: AlwaysStoppedAnimation<Color>(
                isDark ? AppColors.darkPrimary : AppColors.lightPrimary,
              ),
            ),
          ),
          if (message != null) ...[
            const SizedBox(height: 16),
            Text(
              message!,
              style: TextStyle(
                fontSize: 14,
                color: isDark 
                    ? AppColors.darkTextSecondary 
                    : AppColors.lightTextSecondary,
              ),
              textAlign: TextAlign.center,
            ),
          ],
        ],
      ),
    );
  }
}

/// 전체 화면 로딩 인디케이터
/// 
/// 화면 전체를 덮는 로딩 표시를 위한 위젯
class FullScreenLoadingIndicator extends StatelessWidget {
  /// 로딩 메시지 (선택사항)
  final String? message;
  
  /// 배경 투명도
  final double backgroundOpacity;

  const FullScreenLoadingIndicator({
    super.key,
    this.message,
    this.backgroundOpacity = 0.5,
  });

  @override
  Widget build(BuildContext context) {
    final isDark = Theme.of(context).brightness == Brightness.dark;
    
    return Container(
      color: (isDark ? Colors.black : Colors.white)
          .withValues(alpha: backgroundOpacity),
      child: LoadingIndicator(message: message),
    );
  }
}