HydroNutrify_Ari_e41221567/lib/ui/shared/components/loading_indicator.dart

import 'package:flutter/material.dart';
import 'package:mobile_monitoring/core/constants/colors.dart';

/// Loading Indicator - Widget untuk menampilkan loading state
class LoadingIndicator extends StatelessWidget {
  final double size;
  final Color? color;
  final String? message;

  const LoadingIndicator({
    super.key,
    this.size = 40,
    this.color,
    this.message,
  });

  @override
  Widget build(BuildContext context) {
    return Center(
      child: Column(
        mainAxisSize: MainAxisSize.min,
        children: [
          SizedBox(
            width: size,
            height: size,
            child: CircularProgressIndicator(
              valueColor: AlwaysStoppedAnimation<Color>(
                color ?? AppColors.primary,
              ),
              strokeWidth: 3,
            ),
          ),
          if (message != null) ...[
            const SizedBox(height: 16),
            Text(
              message!,
              style: const TextStyle(
                fontSize: 14,
                color: AppColors.textSecondary,
              ),
              textAlign: TextAlign.center,
            ),
          ],
        ],
      ),
    );
  }
}

/// Overlay Loading - Full screen loading dengan overlay
class OverlayLoading extends StatelessWidget {
  final String? message;

  const OverlayLoading({
    super.key,
    this.message,
  });

  @override
  Widget build(BuildContext context) {
    return Container(
      color: Colors.black.withValues(alpha: 0.5),
      child: Center(
        child: Container(
          padding: const EdgeInsets.all(24),
          decoration: BoxDecoration(
            color: AppColors.white,
            borderRadius: BorderRadius.circular(16),
          ),
          child: LoadingIndicator(message: message),
        ),
      ),
    );
  }
}

/// Shimmer Loading - Shimmer effect untuk skeleton loading
class ShimmerLoading extends StatefulWidget {
  final double width;
  final double height;
  final BorderRadius? borderRadius;

  const ShimmerLoading({
    super.key,
    required this.width,
    required this.height,
    this.borderRadius,
  });

  @override
  State<ShimmerLoading> createState() => _ShimmerLoadingState();
}

class _ShimmerLoadingState extends State<ShimmerLoading>
    with SingleTickerProviderStateMixin {
  late AnimationController _controller;
  late Animation<double> _animation;

  @override
  void initState() {
    super.initState();
    _controller = AnimationController(
      duration: const Duration(milliseconds: 1500),
      vsync: this,
    )..repeat();
    _animation = Tween<double>(begin: -1.0, end: 2.0).animate(
      CurvedAnimation(parent: _controller, curve: Curves.easeInOut),
    );
  }

  @override
  void dispose() {
    _controller.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return AnimatedBuilder(
      animation: _animation,
      builder: (context, child) {
        return Container(
          width: widget.width,
          height: widget.height,
          decoration: BoxDecoration(
            borderRadius: widget.borderRadius ?? BorderRadius.circular(8),
            gradient: LinearGradient(
              begin: Alignment.centerLeft,
              end: Alignment.centerRight,
              colors: const [
                AppColors.lightGray,
                AppColors.white,
                AppColors.lightGray,
              ],
              stops: [
                _animation.value - 0.3,
                _animation.value,
                _animation.value + 0.3,
              ],
            ),
          ),
        );
      },
    );
  }
}

/// Linear Progress Indicator - Progress bar
class CustomLinearProgress extends StatelessWidget {
  final double? value;
  final Color? backgroundColor;
  final Color? valueColor;
  final double height;
  final BorderRadius? borderRadius;

  const CustomLinearProgress({
    super.key,
    this.value,
    this.backgroundColor,
    this.valueColor,
    this.height = 4,
    this.borderRadius,
  });

  @override
  Widget build(BuildContext context) {
    return ClipRRect(
      borderRadius: borderRadius ?? BorderRadius.circular(height / 2),
      child: SizedBox(
        height: height,
        child: LinearProgressIndicator(
          value: value,
          backgroundColor: backgroundColor ?? AppColors.lightGray,
          valueColor: AlwaysStoppedAnimation<Color>(
            valueColor ?? AppColors.primary,
          ),
        ),
      ),
    );
  }
}