package notify

import (
	"encoding/json"
	"nCovTrack-Backend/global"
	"nCovTrack-Backend/models"
	"strconv"
)

const (
	NOTIFY_KEY       = "notification_"
	NOTIFY_DEL_VALUE = "notify_del"
)

func InsertNotification(userId int, notification models.BackNotification) {
	key := NOTIFY_KEY + strconv.Itoa(userId)
	valueStr, _ := json.Marshal(notification)
	global.Redis.RPush(key, valueStr)
}

func DeleteNotification(userId int, index int) {
	key := NOTIFY_KEY + strconv.Itoa(userId)
	pipe := global.Redis.TxPipeline()
	pipe.LSet(key, int64(index), NOTIFY_DEL_VALUE)
	pipe.LRem(key, 2, NOTIFY_DEL_VALUE)
	pipe.Exec()
}

func QueryNotificationLen(userId int) int {
	key := NOTIFY_KEY + strconv.Itoa(userId)
	return int(global.Redis.LLen(key).Val())
}

func ListNotifycation(userId int, start, end int) []models.BackNotification {
	key := NOTIFY_KEY + strconv.Itoa(userId)
	var notifications []models.BackNotification
	notificationStrArr := global.Redis.LRange(key, int64(start), int64(end)).Val()
	for _, notificationStr := range notificationStrArr {
		var notification models.BackNotification
		json.Unmarshal([]byte(notificationStr), &notification)
		notifications = append(notifications, notification)
	}
	return notifications
}