print("\n--- Class + Extension Syntax Proposal (Spec Tests) ---");

// These tests define the intended behavior and syntax. The parser/runtime
// will be implemented to satisfy them.

// Class declaration
class Person {
  var name;
  var age;

  func init(name, age) {
    this.name = name;
    this.age = age;
  }

  func greet() {
    print("Hi, I'm " + this.name + " (" + toString(this.age) + ")");
  }

  func birthday() {
    this.age = this.age + 1;
  }
}

// Instantiation + method calls
// var p = Person("Bob", 30);
// p.greet();          // "Hi, I'm Bob (30)"
// p.birthday();
// p.greet();          // "Hi, I'm Bob (31)"

// Extension: add methods to an existing class
extension Person {
  func rename(newName) {
    this.name = newName;
  }
}

// p.rename("Robert");
// p.greet();          // "Hi, I'm Robert (31)"

// Extension on built-ins (string, array, dict are the type names)
extension string {
  func repeat(n) {
    var out = "";
    var i = 0;
    while (i < n) {
      out = out + this;
      i = i + 1;
    }
    return out;
  }
}

// assert("ha".repeat(3) == "hahaha", "string.repeat should repeat string");

extension array {
  func firstOr(defaultValue) {
    if (len(this) == 0) return defaultValue;
    return this[0];
  }
}

// assert([].firstOr("none") == "none", "array.firstOr should return default on empty");

// Extension on any: adds a method to all objects
extension any {
  func debug() {
    return type(this) + ":" + toString(this);
  }
}

// assert(42.debug() == "number:42", "any.debug should work on numbers");
// assert("x".debug() == "string:x", "any.debug should work on strings");

print("Class + Extension spec tests defined (pending parser/runtime support).");