package broker

import (
	"crypto/tls"

	"github.com/micro/go-micro/broker/codec"
	"github.com/micro/go-micro/registry"
	"golang.org/x/net/context"
)

type Options struct {
	Addrs     []string
	Secure    bool
	Codec     codec.Codec
	TLSConfig *tls.Config
	// Other options for implementations of the interface
	// can be stored in a context
	Context context.Context
}

type PublishOptions struct {
	// Other options for implementations of the interface
	// can be stored in a context
	Context context.Context
}

type SubscribeOptions struct {
	// AutoAck defaults to true. When a handler returns
	// with a nil error the message is acked.
	AutoAck bool
	// Subscribers with the same queue name
	// will create a shared subscription where each
	// receives a subset of messages.
	Queue string

	// Other options for implementations of the interface
	// can be stored in a context
	Context context.Context
}

type Option func(*Options)

type PublishOption func(*PublishOptions)

type SubscribeOption func(*SubscribeOptions)

type contextKeyT string

var (
	registryKey = contextKeyT("github.com/micro/go-micro/registry")
)

func newSubscribeOptions(opts ...SubscribeOption) SubscribeOptions {
	opt := SubscribeOptions{
		AutoAck: true,
	}

	for _, o := range opts {
		o(&opt)
	}

	return opt
}

// Addrs sets the host addresses to be used by the broker
func Addrs(addrs ...string) Option {
	return func(o *Options) {
		o.Addrs = addrs
	}
}

// Codec sets the codec used for encoding/decoding used where
// a broker does not support headers
func Codec(c codec.Codec) Option {
	return func(o *Options) {
		o.Codec = c
	}
}

// DisableAutoAck will disable auto acking of messages
// after they have been handled.
func DisableAutoAck() SubscribeOption {
	return func(o *SubscribeOptions) {
		o.AutoAck = false
	}
}

// Queue sets the name of the queue to share messages on
func Queue(name string) SubscribeOption {
	return func(o *SubscribeOptions) {
		o.Queue = name
	}
}

func Registry(r registry.Registry) Option {
	return func(o *Options) {
		o.Context = context.WithValue(o.Context, registryKey, r)
	}
}

// Secure communication with the broker
func Secure(b bool) Option {
	return func(o *Options) {
		o.Secure = b
	}
}

// Specify TLS Config
func TLSConfig(t *tls.Config) Option {
	return func(o *Options) {
		o.TLSConfig = t
	}
}