/* --------------------------------------------- 100 -------------------------------------------- */

import 'dart:io';

// void main() {
  
//   print("please enter your age");
//   String? _age = stdin.readLineSync();
//   int age = int.parse(_age!);
//   int turn100 = 100 - age;
//   print("your age is $turn100");
//   if (age%2 > 0) {
//     print("your age is odd");
//   }
//   else if (age%2 == 0) {
//     print("your age is even");
//   } 
// }

abstract class Component {
  final String id;
  final double x;
  final double y;
  final String themeColor;
  final bool isVisible;

  // The base constructor sets the foundation
  Component({
    required this.id,
    required this.x,
    required this.y,
    this.themeColor = 'blue', // Default value
    this.isVisible = true,    // Default value
  });

  void render();
}


class Button extends Component {
  final String label;
  final double width;
  final double height;

  Button({
    // --- Unique to Button ---
    required this.label,
    required this.width,
    required this.height,

    // --- Passed to Component via super. ---
    required super.id,
    required super.x,
    required super.y,
    super.themeColor,  // Doesn't require coz if user not define it defaults to parent's 'blue'. But if user provide value, use super to assign provided value to parent class variable. 
    super.isVisible,  // Doesn't require coz if user not define, it defaults to parent's 'true'


    // "assert" is a "sanity check" that runs before the class is even fully created. It ensures you can't accidentally create an invisible button with a width of -50. If the condition fails, the program crashes (in debug mode) with your custom error message.
  }) : assert(width > 0 && height > 0, 'Dimensions must be positive'); 

  @override
  void render() {
    print('Rendering Button "$label" at ($x, $y) with color $themeColor');
  }
}


void main() {
  final loginBtn = Button(
    label: 'Login',
    width: 200,
    height: 50,
    id: 'btn_001',
    x: 100,
    y: 500,
    themeColor: 'green', // Overriding the default
  );

  loginBtn.render();
}

// ------------------------------------------------------------------