package server

import (
	"github.com/jaevor/go-nanoid"
	"github.com/pkg/errors"
)

var newRandomInstanceID func() string

func init() {
	generator, err := nanoid.Standard(21)
	if err != nil {
		panic(errors.Wrap(err, "could not generate random instance id"))
	}

	newRandomInstanceID = generator
}

type Options struct {
	InstanceID              string
	Address                 string
	DisableServiceDiscovery bool
}

type OptionFunc func(opts *Options)

func NewOptions(funcs ...OptionFunc) *Options {
	opts := &Options{
		InstanceID:              NewRandomInstanceID(),
		Address:                 ":",
		DisableServiceDiscovery: false,
	}

	for _, fn := range funcs {
		fn(opts)
	}

	return opts
}

func WithAddress(addr string) OptionFunc {
	return func(opts *Options) {
		opts.Address = addr
	}
}

func WithInstanceID(id string) OptionFunc {
	return func(opts *Options) {
		opts.InstanceID = id
	}
}

func WithServiceDiscoveryDisabled(disabled bool) OptionFunc {
	return func(opts *Options) {
		opts.DisableServiceDiscovery = disabled
	}
}

func NewRandomInstanceID() string {
	return newRandomInstanceID()
}