package main

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

func Follow(event *linebot.Event) {
	// add user
	uid := event.Source.UserID
	usr := &User{
		ID: uid,
	}
	Hit("加入", uid)

	reply := event.ReplyToken

	row := DB.Exec("select id from users where id = ?", uid).RowsAffected
	if row == 0 {
		// 新用戶
		if err := DB.Create(usr).Error; err != nil {
			log.Error().Err(err).Msg("Follow error.")
			return
		}

		// 舊用戶
		log.Debug().Str("user", uid).Msg("New user.")
		msg := linebot.NewTextMessage("你好!")
		if reply != "" {
			if _, err := bot.ReplyMessage(reply, msg).Do(); err != nil {
				log.Error().Err(err).Caller().Msg("reply error")
			}
		} else {
			if _, err := bot.PushMessage(uid, msg).Do(); err != nil {
				log.Error().Err(err).Caller().Msg("push error")
			}
		}

	} else {
		// 舊用戶
		log.Debug().Str("user", uid).Msg("user unblocked.")
		msg := linebot.NewTextMessage("歡迎回來!")
		if reply != "" {
			if _, err := bot.ReplyMessage(reply, msg).Do(); err != nil {
				log.Error().Err(err).Caller().Msg("reply error")
			}
		} else {
			if _, err := bot.PushMessage(uid, msg).Do(); err != nil {
				log.Error().Err(err).Caller().Msg("push error")
			}
		}
	}

	// Welcome and ask for
}