package main

import (
	"bytes"
	"encoding/json"
	"fmt"
	"io/ioutil"
	"net/http"
	"strings"
	"time"

	"github.com/gin-gonic/gin"
	"github.com/line/line-bot-sdk-go/v7/linebot"
	"github.com/rs/zerolog/log"
)

func webhook(c *gin.Context) {
	events, err := bot.ParseRequest(c.Request)
	if err != nil {
		panic(err)
	}

	if flagDev {
		data, _ := json.MarshalIndent(events, "", "  ")
		go fmt.Println(string(data))
	}

	for _, event := range events {
		if event.Type == linebot.EventTypeFollow {
			Follow(event)
		}
		if event.Type == linebot.EventTypeMessage {
			controller(event)
		}
		if event.Type == linebot.EventTypePostback {
			postback(event)
		}
	}

	OK(c, "ok")
}

func postback(event *linebot.Event) {
	data := event.Postback.Data
	Hit(data, event.Source.UserID)
	switch {
	case strings.HasPrefix(data, "select="):
		ApiSelectProfile(event)
	case strings.HasPrefix(data, "claim="):
		ApiPrepareClaim(event)
	case strings.HasPrefix(data, "cat="):
		ApiListProductOfCat(event)
	case data == "list-tags":
		ApiListCategories(event)
	}
}

func controller(event *linebot.Event) {

	msg, ok := event.Message.(*linebot.TextMessage)
	if !ok {
		log.Error().Msg("controller not impemented")
		return
	}
	Hit(msg.Text, event.Source.UserID)

	switch {
	case msg.Text == "我想投保":
		ApiPreparePurchase(event)
	case msg.Text == "辦理理賠":
		ApiMyOrders(event)
	case msg.Text == "我的資料":
		ApiMe(event)
	case msg.Text == "我的保單":
		ApiMyOrders(event)
	case msg.Text == "為我推薦":
		ApiListRecommanded(event)

	// discard
	case strings.HasPrefix(msg.Text, "我是"):
	case msg.Text == "我知道":
	case msg.Text == "我要理賠":

	default:
		// route to watson
		if err := watson(event); err != nil {
			log.Error().Caller().Err(err).Msg("watson error")
		}
	}

}

func watson(event *linebot.Event) error {
	input, _ := event.Message.(*linebot.TextMessage)
	payload := fmt.Sprintf(`{"input":{"text": "%v"}}`, input.Text)

	url := fmt.Sprintf("https://api.jp-tok.assistant.watson.cloud.ibm.com/instances/%v/v2/assistants/%v/message?version=2022-06-14",
		IBM_INSTANCE, IBM_ASSISTANT)
	req, err := http.NewRequest("POST", url, bytes.NewReader([]byte(payload)))
	if err != nil {
		return err
	}
	req.Header.Set("Content-Type", "application/json")
	req.Header.Set("Authorization", IBM_API)
	client := &http.Client{
		Timeout: time.Second * 10,
	}
	res, err := client.Do(req)
	if err != nil {
		return err
	}
	defer res.Body.Close()
	data, err := ioutil.ReadAll(res.Body)
	if err != nil {
		return err
	}
	log.Debug().RawJSON("watson", data).Msg("")
	resData := struct {
		Output struct {
			Generic []struct {
				Text string `json:"text"`
			} `json:"generic"`
		} `json:"output"`
	}{}
	json.Unmarshal(data, &resData)

	if len(resData.Output.Generic) > 0 &&
		resData.Output.Generic[0].Text != "我想我不明白。請重新描述您的問題。" {
		log.Debug().Str("message", resData.Output.Generic[0].Text).
			Msg("redirect")
		_, err = SendMessage(event.ReplyToken, event.Source.UserID,
			linebot.NewTextMessage(resData.Output.Generic[0].Text))
		if err == nil {
			return nil
		}
	}

	_, err = SendMessage("", event.Source.UserID,
		DefaultMsg())
	return err
}