package main

import "fmt"

type Pet struct {
	Name      string
	IsRunning bool
}

func NewPet(name string) *Pet {
	return &Pet{Name: name}
}

func (p *Pet) Run() string {
	p.IsRunning = true
	return p.Name + " is running"
}

type Dog struct {
	Pet

	currentChaseTarget *Pet
}

func NewDog(name string) *Dog {
	dog := &Dog{}
	dog.Name = name
	return dog
}

func (d *Dog) Chase(target *Pet) string {
	d.IsRunning = true
	d.currentChaseTarget = target
	d.currentChaseTarget.Run()

	return d.Name + " is chasing " + target.Name
}

func main() {
	cat := NewPet("Felix")

	fmt.Printf("%#v\n", cat)

	cat.Run()

	fmt.Printf("%#v\n", cat)

	dog := NewDog("Fido")

	fmt.Printf("%#v\n", dog)
	fmt.Printf("%#v\n", dog.Chase(cat))

	fmt.Printf("%#v\n", dog)
	fmt.Printf("%#v\n", cat)
}