package bbgo

import (
	"bytes"

	"github.com/sirupsen/logrus"

	"github.com/c9s/bbgo/pkg/util"
)

var Notification = &Notifiability{
	SymbolChannelRouter:  NewPatternChannelRouter(nil),
	SessionChannelRouter: NewPatternChannelRouter(nil),
	ObjectChannelRouter:  NewObjectChannelRouter(),
}

func Notify(obj interface{}, args ...interface{}) {
	Notification.Notify(obj, args...)
}

func NotifyTo(channel string, obj interface{}, args ...interface{}) {
	Notification.NotifyTo(channel, obj, args...)
}

func SendPhoto(buffer *bytes.Buffer) {
	Notification.SendPhoto(buffer)
}

func SendPhotoTo(channel string, buffer *bytes.Buffer) {
	Notification.SendPhotoTo(channel, buffer)
}

type Notifier interface {
	NotifyTo(channel string, obj interface{}, args ...interface{})
	Notify(obj interface{}, args ...interface{})
	SendPhotoTo(channel string, buffer *bytes.Buffer)
	SendPhoto(buffer *bytes.Buffer)
}

type NullNotifier struct{}

func (n *NullNotifier) NotifyTo(channel string, obj interface{}, args ...interface{}) {}

func (n *NullNotifier) Notify(obj interface{}, args ...interface{}) {}

func (n *NullNotifier) SendPhoto(buffer *bytes.Buffer) {}

func (n *NullNotifier) SendPhotoTo(channel string, buffer *bytes.Buffer) {}

type Notifiability struct {
	notifiers            []Notifier
	SessionChannelRouter *PatternChannelRouter `json:"-"`
	SymbolChannelRouter  *PatternChannelRouter `json:"-"`
	ObjectChannelRouter  *ObjectChannelRouter  `json:"-"`
}

// RouteSymbol routes symbol name to channel
func (m *Notifiability) RouteSymbol(symbol string) (channel string, ok bool) {
	if m.SymbolChannelRouter != nil {
		return m.SymbolChannelRouter.Route(symbol)
	}
	return "", false
}

// RouteSession routes Session name to channel
func (m *Notifiability) RouteSession(session string) (channel string, ok bool) {
	if m.SessionChannelRouter != nil {
		return m.SessionChannelRouter.Route(session)
	}
	return "", false
}

// RouteObject routes object to channel
func (m *Notifiability) RouteObject(obj interface{}) (channel string, ok bool) {
	if m.ObjectChannelRouter != nil {
		return m.ObjectChannelRouter.Route(obj)
	}
	return "", false
}

// AddNotifier adds the notifier that implements the Notifier interface.
func (m *Notifiability) AddNotifier(notifier Notifier) {
	m.notifiers = append(m.notifiers, notifier)
}

func (m *Notifiability) Notify(obj interface{}, args ...interface{}) {
	if str, ok := obj.(string); ok {
		simpleArgs := util.FilterSimpleArgs(args)
		logrus.Infof(str, simpleArgs...)
	}

	for _, n := range m.notifiers {
		n.Notify(obj, args...)
	}
}

func (m *Notifiability) NotifyTo(channel string, obj interface{}, args ...interface{}) {
	for _, n := range m.notifiers {
		n.NotifyTo(channel, obj, args...)
	}
}

func (m *Notifiability) SendPhoto(buffer *bytes.Buffer) {
	for _, n := range m.notifiers {
		n.SendPhoto(buffer)
	}
}

func (m *Notifiability) SendPhotoTo(channel string, buffer *bytes.Buffer) {
	for _, n := range m.notifiers {
		n.SendPhotoTo(channel, buffer)
	}
}