main.go

// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package main

import (
	"fmt"
	"log"
	"net/http"
	"os"
	"strings"

	luis "github.com/kkdai/luis"
	"github.com/line/line-bot-sdk-go/v7/linebot"
)

var bot *linebot.Client
var luisAction *LuisAction
var allIntents *luis.IntentListResponse
var currentUtterance string

func main() {
	var err error
	appID := os.Getenv("APP_ID")
	apiKey := os.Getenv("APP_KEY")
	log.Println("Luis:", appID, apiKey)
	luisAction = NewLuisAction(appID, apiKey)

	bot, err = linebot.New(os.Getenv("ChannelSecret"), os.Getenv("ChannelAccessToken"))
	log.Println("Bot:", bot, " err:", err)
	http.HandleFunc("/callback", callbackHandler)
	port := os.Getenv("PORT")
	addr := fmt.Sprintf(":%s", port)
	http.ListenAndServe(addr, nil)
}

func callbackHandler(w http.ResponseWriter, r *http.Request) {
	events, err := bot.ParseRequest(r)

	if err != nil {
		if err == linebot.ErrInvalidSignature {
			w.WriteHeader(400)
		} else {
			w.WriteHeader(500)
		}
		return
	}

	for _, event := range events {
		switch event.Type {
		case linebot.EventTypeMessage:
			log.Println("event.Type == EventTypeMessage")
			switch message := event.Message.(type) {
			case *linebot.TextMessage:
				res, err := luisAction.GetIntents()
				if err != nil {
					log.Println(err)
					return
				}
				var intentList []string
				log.Println("All intent:", *res)
				for _, v := range *res {
					if strings.EqualFold(message.Text, v.Name) {
						//if input text equal to intents, just leave. (ignore dual event on post action)
						return
					}

					if v.Name != "None" {
						intentList = append(intentList, v.Name)
					}
				}

				ret := luisAction.Predict(message.Text)
				if ret.Intent == "None" || ret.Intent == "" || ret.Score < 0.5 {
					//List all intents
					ListAllIntents(bot, event.ReplyToken, intentList, message.Text)

				} else {
					if _, err := bot.ReplyMessage(event.ReplyToken, linebot.NewTextMessage(fmt.Sprintf("Daddy/Mommy, I just want to %s (%d %%)", ret.Intent, int(ret.Score*100)))).Do(); err != nil {
						log.Print(err)
					}
				}
			}
		case linebot.EventTypePostback:
			log.Println("event.Type == linebot.EventTypePostback")
			//Add new utterance into original intent
			luisAction.AddUtterance(event.Postback.Data, currentUtterance)

			retStr := fmt.Sprintf("Daddy/Mommy, I just learn new utterance %s for intent: %s.", currentUtterance, event.Postback.Data)
			if _, err = bot.ReplyMessage(event.ReplyToken, linebot.NewTextMessage(retStr)).Do(); err != nil {
				log.Print(err)
			}

			//Train it right away
			luisAction.Train()
			return
		}
	}
}

//ListAllIntents :
func ListAllIntents(bot *linebot.Client, replyToken string, intents []string, utterance string) {
	askStmt := fmt.Sprintf("Your utterance %s is not exist, please select correct intent.", utterance)
	log.Println("askStmt:", askStmt)

	var sliceTemplateAction []linebot.TemplateAction
	for _, v := range intents {
		sliceTemplateAction = append(sliceTemplateAction, linebot.NewPostbackAction(v, v, v, "", linebot.InputOptionCloseRichMenu, ""))
	}

	template := linebot.NewButtonsTemplate("", "Select your intent for your baby", utterance, sliceTemplateAction...)

	if _, err := bot.ReplyMessage(
		replyToken,
		linebot.NewTemplateMessage("Select your intent for your baby", template)).Do(); err != nil {
		log.Print(err)
	}
	currentUtterance = utterance
}