package api

import (
	"fmt"
	"io"
	"os"
)

type Widget struct {
	Hello
	Credits
	Writer io.Writer
}

type MethodResponder interface {
	Respond(io.Writer, ...string) error
}

type Method string

func NewWidget(name, id string, author, homepage string) *Widget {
	return &Widget{
		Hello: Hello{
			Name:    name,
			ID:      id,
			Version: 1,
		},
		Credits: Credits{
			Author:   author,
			Homepage: homepage,
		},
		Writer: os.Stdout,
	}
}

func (w *Widget) Handle() error {
	if len(os.Args) < 2 {
		return fmt.Errorf("no method")
	}
	switch Method(os.Args[1]) {
	case MethodHello:
		return w.Hello.Respond(w.Writer)
	case MethodCredits:
		return w.Credits.Respond(w.Writer)
	}
	return fmt.Errorf("unknown method: %s", os.Args[1])
}