package process

import (
	"fmt"
	"io"
)

var makeFs = make(map[string]RegisterNewRootfs[Rootfs])

type RegisterNewRootfs[T Rootfs] func(...any) (T, error)

type Rootfs interface {
	NewProcess() (Proc, error) // Return new struct to start process
	Close() error              // Close session
	Tar(io.Writer) error       // return tar reader file without copression
	FromTar(r io.Reader) error // Extract tar to rootfs path
}

// Register new rootfs
func RegisterRootfs[T Rootfs](typeName string, makeProc RegisterNewRootfs[T]) error {
	if makeFs == nil {
		return fmt.Errorf("cannot append to makeFs register")
	}
	makeFs[typeName] = func(a ...any) (Rootfs, error) { return makeProc(a...) }
	return nil
}

// Return new rootfs struct
func NewRootfs(typeName string, opts ...any) (Rootfs, error) {
	if newProc, ok := makeFs[typeName]; ok {
		return newProc(opts...)
	}
	return nil, ErrNoProcFound
}