package server

import (
	"crypto/tls"

	"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
	TLSAddress             string
	TLSCertificate         *tls.Certificate
	EnableServiceDiscovery bool
	EnableApps             bool
	DefaultApp             string
	AllowedOrigins         []string
	Apps                   []App
}

type OptionFunc func(opts *Options)

func NewOptions(funcs ...OptionFunc) *Options {
	opts := &Options{
		InstanceID:             NewRandomInstanceID(),
		Address:                ":",
		TLSAddress:             ":",
		EnableServiceDiscovery: true,
		EnableApps:             false,
		DefaultApp:             "",
		AllowedOrigins:         make([]string, 0),
		Apps:                   make([]App, 0),
	}

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

	return opts
}

func WithAppsEnabled(enabled bool) OptionFunc {
	return func(opts *Options) {
		opts.EnableApps = enabled
	}
}

func WithDefaultApp(defaultApp string) OptionFunc {
	return func(opts *Options) {
		opts.DefaultApp = defaultApp
	}
}

func WithApps(apps ...App) OptionFunc {
	return func(opts *Options) {
		opts.Apps = apps
	}
}

func WithAllowedOrigins(origins ...string) OptionFunc {
	return func(opts *Options) {
		opts.AllowedOrigins = origins
	}
}

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

func WithTLSAddress(addr string) OptionFunc {
	return func(opts *Options) {
		opts.TLSAddress = addr
	}
}

func WithTLSCertificate(cert *tls.Certificate) OptionFunc {
	return func(opts *Options) {
		opts.TLSCertificate = cert
	}
}

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

func WithServiceDiscoveryEnabled(enabled bool) OptionFunc {
	return func(opts *Options) {
		opts.EnableServiceDiscovery = enabled
	}
}

func NewRandomInstanceID() string {
	return newRandomInstanceID()
}