package group

import (
	"fmt"
	"log"
	"os"
	"strings"

	"github.com/spf13/cobra"
	"github.com/spf13/viper"
	ldap "github.com/go-ldap/ldap/v3"

	util "git.metaunix.net/metaunix.net/muldap/lib/util"
)

func init() {
	// define group add subcommand flags
	groupAddMemberCmd.Flags().StringP("base_ou", "o", "", "LDAP OU to search for the group entry under")
	groupAddMemberCmd.Flags().StringP("id_attribute", "a", "cn", "LDAP DN attribute for groups")
	groupAddMemberCmd.Flags().StringVarP(&flagGroupName, "group_name", "n", "", "Name for the group")
	groupAddMemberCmd.Flags().StringVarP(&flagGroupType, "group_type", "t", "unix", "Type of the group")
	groupAddMemberCmd.Flags().StringVarP(&flagGroupMembers, "group_members", "m", "", "Members to add to the group (comma-separated list)")
	// bind config file values to group add flags
	viper.BindPFlag("group.base_ou", groupAddMemberCmd.Flags().Lookup("base_ou"))
	viper.BindPFlag("group.id_attr", groupAddMemberCmd.Flags().Lookup("id_attribute"))
}

// define group add subcommand
var groupAddMemberCmd = &cobra.Command{
	Use:   "addMember",
	Short: "Add a member to an LDAP group",
	Long:  `Adds an LDAP user as a member of an LDAP group.`,
	Run: func(cmd *cobra.Command, args []string) {
		// check the type given
		if !util.ContainsString(validTypes, flagGroupType) {
			log.Fatal(fmt.Errorf("%s is not a valid group type; valid types are: %v", flagGroupType, validTypes))
			os.Exit(1)
		}

		// check if users were supplied
		if flagGroupMembers == "" {
			log.Fatal(fmt.Errorf("you didn't supply any members to add to the group"))
			os.Exit(1)
		}

		// create new LDAP connection
		l, err := ldap.Dial("tcp", fmt.Sprintf("%s:%d", viper.GetString("host"), viper.GetInt("port")))
		if err != nil {
			log.Fatal(err)
		}
		defer l.Close()

		// bind as the admin dn
		err = l.Bind(viper.GetString("bind_dn"), viper.GetString("bind_pw"))
		if err != nil {
			log.Fatal(err)
		}

		// set up group attributes
		groupDn := fmt.Sprintf("%s=%s,%s", viper.GetString("group.id_attr"), flagGroupName, viper.GetString("group.base_ou"))
		// create new LDAP modify request
		groupMod := ldap.NewModifyRequest(groupDn, nil)

		// split list of group members
		groupMembers := strings.Split(flagGroupMembers, ",")

		// add attributes based on group type
		if flagGroupType == "unix" {
			// add new member attribute
			groupMod.Add("memberUid", groupMembers)
		} else if flagGroupType == "app" {
			// loop through app group members to create their full DNs
			for i, member := range groupMembers {
				groupMembers[i] = fmt.Sprintf("%s=%s,%s", viper.GetString("user.uid_attr"), member, viper.GetString("user.base_ou"))
			}
			// add new member attribute
			groupMod.Add("member", groupMembers)
		}

		// perform the add operation
		err = l.Modify(groupMod)
		if err != nil {
			log.Fatal(err)
		}

		// create and send a modify request for each user to update modification times for replication
		if flagGroupMembers != "" && flagGroupType == "app" {
			groupMembers := strings.Split(flagGroupMembers, ",")
			for _, member := range groupMembers {
				userMod := ldap.NewModifyRequest(fmt.Sprintf("%s=%s,%s", viper.GetString("user.uid_attr"), member, viper.GetString("user.base_ou")), nil)
				userMod.Replace(viper.GetString("user.uid_attr"), []string{member})
				err = l.Modify(userMod)
				if err != nil {
					log.Fatal(err)
				}
			}
		}
	},
}