package main

import (
	"fmt"
)

type ComputerPart interface {
	Accept(ComputerVisitor)
}

type ComputerVisitor interface {
	VisitCPU(*CPU)
	VisitDisk(*Disk)
	VisitMemory(*Memory)
}

type CPU struct {
	UUID      string
	Frequency float64
}

func (c *CPU) Accept(v ComputerVisitor) {
	v.VisitCPU(c)
}

type Disk struct {
	UUID string
	Size uint64
}

func (d *Disk) Accept(v ComputerVisitor) {
	v.VisitDisk(d)
}

type Memory struct {
	UUID string
	Size uint64
}

func (m *Memory) Accept(v ComputerVisitor) {
	v.VisitMemory(m)
}

type Laptop struct {
	Parts []ComputerPart
}

func (l *Laptop) Accept(v ComputerVisitor) {
	for _, p := range l.Parts {
		p.Accept(v)
	}
}

type SpecsVisitor struct{}

func (v *SpecsVisitor) VisitCPU(c *CPU) {
	fmt.Printf("cpu uuid=%s freq=%.2f GHz\n", c.UUID, c.Frequency)
}

func (v *SpecsVisitor) VisitDisk(d *Disk) {
	fmt.Printf("disk uuid=%s size=%d TB\n", d.UUID, d.Size)
}

func (v *SpecsVisitor) VisitMemory(m *Memory) {
	fmt.Printf("ram uuid=%s size=%d GB\n", m.UUID, m.Size)
}

func main() {
	l := new(Laptop)
	l.Parts = []ComputerPart{
		&CPU{"dbe0e589-0eba-404e-bf8e-6664e1bc37c4", 3.6},
		&CPU{"fd4db97c-596d-4fe7-9a1a-20cbaf0f4e8e", 3.6},
		&Disk{"1679dc4e-dea9-4da3-bcc9-e6f608f65d56", 3},
		&Disk{"c15fbae8-68e9-455e-8bb0-687c1e9580f5", 3},
		&Memory{"7c4cbdef-005a-44cc-9104-478a2e2b2441", 4},
		&Memory{"15734c16-f73b-4921-805b-7cd6163a9678", 4},
		&Memory{"d3a6fe65-8fe0-47e5-bb7f-34fcd35b0e94", 4},
		&Memory{"f286b96a-d18e-4dbf-b333-371a3ab6ee88", 4},
	}
	visitor := new(SpecsVisitor)
	l.Accept(visitor)
}