package runtime

import (
	"io"
)

type Option func(o *Options)

// Options configure runtime
type Options struct {
	// Notifier for updates
	Notifier Notifier
}

// AutoUpdate enables micro auto-updates
func WithNotifier(n Notifier) Option {
	return func(o *Options) {
		o.Notifier = n
	}
}

type CreateOption func(o *CreateOptions)

// CreateOptions configure runtime services
type CreateOptions struct {
	// command to execute including args
	Command []string
	// Environment to configure
	Env []string
	// Log output
	Output io.Writer
}

// WithCommand specifies the command to execute
func WithCommand(c string, args ...string) CreateOption {
	return func(o *CreateOptions) {
		// set command
		o.Command = []string{c}
		// set args
		o.Command = append(o.Command, args...)
	}
}

// WithEnv sets the created service environment
func WithEnv(env []string) CreateOption {
	return func(o *CreateOptions) {
		o.Env = env
	}
}

// WithOutput sets the arg output
func WithOutput(out io.Writer) CreateOption {
	return func(o *CreateOptions) {
		o.Output = out
	}
}

type ReadOption func(o *ReadOptions)

// ReadOptions queries runtime services
type ReadOptions struct {
	// Version queries services with given version
	Version string
}

// WithVersion confifgures service version
func WithVersion(version string) ReadOption {
	return func(o *ReadOptions) {
		o.Version = version
	}
}