package inner

import (

	"context"

	"github.com/rs/zerolog/log"

	"github.com/slack-go/slack"

)

// invite members to an existing channel by email

// provide a token, channel ID and emails of users to retreive and add to a channel

func main(token string, channelID string, emails []string) (interface{}, error) {

	api := slack.New(token)

  userIDs := []string{}

  for _, email := range emails {

    user, err := api.GetUserByEmail(email)

    if err != nil {

      return nil, err

    }

    userIDs = append(userIDs, user.ID)

  }

  // nothing to do here, return early

  if len(userIDs) == 0 {

    log.Info().Msg("no users to add, skipping")

    return nil,  nil

  }

  log.Info().Str("channelID", channelID).Strs("email", emails).Msg("inviting user to channel")

  _, err := api.InviteUsersToConversationContext(context.Background(), channelID, userIDs...)

  if err != nil {

    return nil, err

  }

	return nil, nil

}