package main

import (
	"github.com/go-ldap/ldap/v3"
	"fmt"
	log "github.com/sirupsen/logrus"
	"math/rand"
	"strings"
	"errors"
	"os"
)


const bindusername = "cn=admin,dc=deuxfleurs,dc=fr"
const adresse = "127.0.0.1"
const port = 1389
var bindpassword string

var all_names = make(map[string]struct{})



func printError(LDAPError error) {
	if LDAPError != nil {
		log.Fatal(LDAPError)
	}
}

func createOU(l *ldap.Conn) error {

	req := ldap.NewAddRequest("ou=groups,dc=deuxfleurs,dc=fr",nil)
	req.Attribute("description",[]string{"OrganizationalUnit qui regroupe tous les groupes"})
	req.Attribute("objectclass",[]string{"organizationalUnit", "top"})
	req.Attribute("ou",[]string{"groups"})
	req.Attribute("structuralobjectclass", []string{"organizationalUnit"})

	err := l.Add(req)
	if err != nil {
		return err
	}

	req = ldap.NewAddRequest("ou=users,dc=deuxfleurs,dc=fr",nil)
	req.Attribute("description",[]string{"OrganizationalUnit qui regroupe tous les utilisateurs"})
	req.Attribute("objectclass",[]string{"organizationalUnit", "top"})
	req.Attribute("ou",[]string{"users"})
	req.Attribute("structuralobjectclass", []string{"organizationalUnit"})

	err = l.Add(req)
	return err
}

func generateName(r *rand.Rand) (name string) {
	for only_one := true; only_one; _, only_one = all_names[name]{
		name = fmt.Sprintf("%d",r.Int())
	}
	all_names[name] = struct{}{}
	log.Debug(fmt.Sprintf("Name generated: %s.\n", name))
	return
}

func createGroup(r *rand.Rand, l *ldap.Conn) (tab_AddRequest []ldap.AddRequest, err error) {
	StructuralObjectClass := []string{"groupOfNames"}
	ObjectClass := []string{"groupOfNames","top"}



	for i := 0; i<20; i++ {
		//Generate name and check if he is unique
		name := generateName(r)

		req := ldap.NewAddRequest(fmt.Sprintf("cn=%s,ou=groups,dc=deuxfleurs,dc=fr",name),nil)
		req.Attribute("description",[]string{generateName(r)})
		req.Attribute("objectclass",ObjectClass)
		req.Attribute("structuralobjectclass",StructuralObjectClass)

		err = l.Add(req)
		if err != nil {
			log.Warn(fmt.Sprintf("Erreur survenue sur la création du [%d] groupe.\n",i))
			return nil, err
		}
		tab_AddRequest = append(tab_AddRequest, *req)

	}
	return
}

func createUser(r *rand.Rand, l *ldap.Conn) (tab_AddRequest []ldap.AddRequest, err error) {
	StructuralObjectClass := []string{"inetOrgPerson"}
	ObjectClass := []string{"inetOrgPerson","organizationalPerson","person","top"}

	for i := 0; i<20; i++ {
		name := generateName(r)

		req := ldap.NewAddRequest(fmt.Sprintf("cn=%s,ou=users,dc=deuxfleurs,dc=fr",name),nil)
		req.Attribute("displayname",[]string{generateName(r)})
		req.Attribute("objectclass",ObjectClass)
		req.Attribute("structuralobjectclass",StructuralObjectClass)

		err = l.Add(req)
		if err != nil {
			log.Warn(fmt.Sprintf("Erreur survenue sur la création du [%d] user.\n",i))
			return nil, err
		}
		tab_AddRequest = append(tab_AddRequest, *req)

	}
	return
}

func search_attributes(tab_Attributes []ldap.Attribute, tipe string) (*ldap.Attribute) {
	for _,att := range tab_Attributes {
		if att.Type == tipe {
			return &att
		}
	}
	return nil
//	return ldap.Attribute{}
}

func test_attributes(l *ldap.Conn, tab_AddRequest []ldap.AddRequest, filter_objectclass, user_or_group string) (err error) {
	for _, addRequest := range tab_AddRequest {

		//On prend le cn en supposant qu'il est unique
		cn := strings.Split(addRequest.DN,",")[0]

		//On crée la requête pour la recherche
		search_req := ldap.NewSearchRequest(
				fmt.Sprintf("ou=%s,dc=deuxfleurs,dc=fr",user_or_group),
				ldap.ScopeWholeSubtree, ldap.NeverDerefAliases, 0, 0, false,
				fmt.Sprintf("(&(objectclass=%s)(%s))", filter_objectclass,cn),
				[]string{"displayname","objectclass","structuralobjectclass"},
				nil,
		)

		//On lance la recherche 
		result, err := l.Search(search_req)
		if err != nil {
			return err
		}
		if len(result.Entries) != 1 {
			return errors.New("Test a trouvé plusieurs displaynames en commun ou en a trouvé aucun")
		}

		//On compare les attributs qu'on a reçu avec les attributs qu'on a envoyé
		result_attributes := result.Entries[0].Attributes
		log.Debug(fmt.Sprintf("La longueur est de %d, contient : \n %s.\n",len(result_attributes), result_attributes))

		//Notre recherche crée un attribut par valeur, même si les valeurs viennent du même nom d'attribut
		//Par exemple: objectclass possède 4 valeurs. Alors on aura 4 EntryAttribute qui contient chacune une des 4 valeurs de l'attribut objectclass

		//j est l'indice qui représente la j-ème valeur de notre attribut
		var j int
		var att *ldap.Attribute
		for i,attributes := range result_attributes {
			//On cherche l'attribut de l'user i qui a le même nom que celui qu'on a reçu et qu'on traite dans cette boucle
			if j == 0 {
				att = search_attributes(addRequest.Attributes, attributes.Name)
				if att == nil {
					return errors.New(fmt.Sprintf("Error: test_attributes - Don't find match name attributes. We search %s.\n", attributes.Name))
				}
			}
			log.Debug(fmt.Sprintf("Le nom de l'attribut est %s, sa valeur est: \n %s.", att.Type, att))

			if j >= len(att.Vals) || att.Vals[j] != attributes.Values[0] {
				return errors.New(fmt.Sprintf("Error: test_attributes - Theses values aren't the same: %d, %d",att.Vals, attributes.Values))
			}

			if i+1 < len(result_attributes) && result_attributes[i+1].Name == attributes.Name {
				j += 1
			} else { j = 0}
		}

	}
	return nil
}

func clean(l *ldap.Conn, AddReq_users, AddReq_groups []ldap.AddRequest,user, group bool) (err error){
	log.Debug("Debut clean")
	if(user) {
		for _,req := range AddReq_users {
			delReq := ldap.NewDelRequest(req.DN,nil)
			err = l.Del(delReq)
			if err != nil {
				return
			}
		}
	}
	if group {
		for _,req := range AddReq_groups {
			delReq := ldap.NewDelRequest(req.DN, nil)
			err = l.Del(delReq)
			if err != nil {
				return
			}
		}
	}
	defer log.Debug("Fin clean")
	return
}

func test_modify_attributes(l *ldap.Conn, r *rand.Rand, tab_AddReq []ldap.AddRequest, tab_type_name []string) (err error) {
	for _, AddReq := range tab_AddReq {
		modReq := ldap.NewModifyRequest(AddReq.DN,nil)
		for _, type_name := range tab_type_name {
			newName := generateName(r)
			modReq.Replace(type_name, []string{newName})
			att := search_attributes(AddReq.Attributes, type_name)
			att.Vals[0] = newName
		}
		err = l.Modify(modReq)
		if err != nil {
			return
		}

	}
	return
}

func add_user_in_groups(l *ldap.Conn, r *rand.Rand, users, groups []ldap.AddRequest) (err error) {
	for _,group := range groups {
		numberUsers := r.Intn(19) + 1 //Always a minimum of 1 user
		list_users := []string{}
		for i:=0; i < numberUsers; i++ {
			list_users = append(list_users, users[i].DN)
		}
		modifyReq := ldap.NewModifyRequest( group.DN, nil)
		modifyReq.Add("member", list_users)

		err = l.Modify(modifyReq)
		if err != nil {
			log.Warn(fmt.Sprintf("Error: ModifyReq failed, func:add_users_in_groups from group:\n %d",group))
			return
		}
	}
	return
}

func delete_groups(l *ldap.Conn, groups []ldap.AddRequest) (list map[string][]string ,err error) {
	list = make(map[string][]string)
	for _, group := range groups {
		//Get lists_users
		cn := strings.Split(group.DN,",")[0]
		search_req := ldap.NewSearchRequest(
				"ou=groups,dc=deuxfleurs,dc=fr",
				ldap.ScopeWholeSubtree, ldap.NeverDerefAliases, 0, 0, false,
				fmt.Sprintf("(&(objectclass=groupOfNames)(%s))",cn),
				[]string{"member"},
				nil,
			)
		res , err := l.Search(search_req)
		if err != nil {
			log.Warn(fmt.Sprintf("Error Search: func: delete_groups_and_check_memberOf, from group: \n %d", group))
			return list, err
		}
		if len(res.Entries) != 1 {
			err = errors.New(fmt.Sprintf("SearchResult get: %s, SearchResult wanted: 1", len(res.Entries)))
			return list, err
		}
		EntryAtt := res.Entries[0].Attributes
		list_users := []string{}
		for _, att := range EntryAtt {
			list_users = append(list_users ,att.Values[0])
		}

		//Del group
		del := ldap.NewDelRequest( group.DN, nil)
		err = l.Del(del)
		if err != nil {
			return list, err
		}
		list[group.DN] = list_users
	}
	return
}

func check_memberOf(l *ldap.Conn, list map[string][]string) (err error) {
	//Check the memberOf of all users
	for groupeDN,_ := range list{
		search_req := ldap.NewSearchRequest(
				"ou=users,dc=deuxfleurs,dc=fr",
				ldap.ScopeWholeSubtree, ldap.NeverDerefAliases,0 ,0, false,
				fmt.Sprintf("(&(objectclass=inetOrgPerson)(memberOf=%s))",groupeDN),
				[]string{"cn"},
				nil,
			)
		res, err := l.Search(search_req)
		if err != nil {
			return err
		}
		if len(res.Entries) != 0 {
			err = errors.New(fmt.Sprintf("L'user '%s' a encore le DN d'un groupe supprimé: %s",res.Entries[0].Attributes[0].Values[0],groupeDN))
			return err
		}
	}
	return err
}

func reconnect(l *ldap.Conn) (l_nouv *ldap.Conn, err error){
	l.Close()
	l_nouv, err = ldap.Dial("tcp", fmt.Sprintf("%s:%d",adresse,port))
	if err != nil {
		return
	}
	err = l_nouv.Bind(bindusername, bindpassword)
	return
}


func main() {
	bindpassword = "FhvuwPzk0ko"
	if len(os.Args)==2 {
		bindpassword = os.Args[1]
	}

	//log.SetLevel(log.TraceLevel)

	//Create a connection with Bottin server
	l, err := ldap.Dial("tcp", fmt.Sprintf("%s:%d", adresse, port))
	//l.Debug = true
	printError(err)

	//Bind with the admin account generated 
	err = l.Bind(bindusername, bindpassword)
	printError(err)

	//Create our object Rand, it's important to always have the same values
	source := rand.NewSource(666475745)
	r := rand.New(source)
	log.Info(fmt.Sprintf("The seed of the rand object is %d.\n",r.Seed))

	//Create user and groups OrgaUnit
	err = createOU(l)
	if ldap.IsErrorWithCode(err, uint16(68)) {
		log.Warn("Les OrganizationalUnit users et groups sont déjà présents.")
	}else {
	printError(err)
	log.Info("Création des OU de groups et users")
	}

	//Create random groups
	tab_AddRequest_groups, err := createGroup(r, l)
	printError(err)
	log.Info(fmt.Sprintf("Création des groupes aléatoirement réussi: %d\n", len(tab_AddRequest_groups)))

	//Create random users
	tab_AddRequest_users, err := createUser(r, l)
	printError(err)
	log.Info(fmt.Sprintf("Création des users aléatoirement réussi: %d\n", len(tab_AddRequest_users)))

	//Search and compare attribute Users. (We keep Attribute object from 'Create random users' and compare with the result of our search)
	err = test_attributes(l,tab_AddRequest_users, "inetOrgPerson","users")
	printError(err)
	log.Info("Tous les attributs users insérés dans Consul ont été vérifiés..\n")

	//Search and compare attributes Groups
	err = test_attributes(l,tab_AddRequest_groups, "groupOfNames","groups")
	printError(err)
	log.Info("Tous les attributs groups insérés dans Consul ont été vérifiés.\n")


	//Close the connection and open an other. If we don't do this, bottin server send a wrong answer. Comment this part if you want to try this
	l,err = reconnect(l)
	printError(err)
	//Modify attributes users and groups.

	//Modify users' attributes and check them

	log.Debug(fmt.Sprintf("Les valeurs sont:\n %s", tab_AddRequest_users))
	err = test_modify_attributes(l, r, tab_AddRequest_users, []string{"displayname"})
	printError(err)
	log.Debug("Modifications users faites")

	//Check if the attributes are correct:
	err = test_attributes(l,tab_AddRequest_users, "inetOrgPerson", "users")
	printError(err)
	log.Info("Les modifications ont bien été prises en compte")
	log.Debug(fmt.Sprintf("Les nouvelles valeurs sont:\n %s", tab_AddRequest_users))




	//Modify users' attributes and check them
	err = test_modify_attributes(l, r, tab_AddRequest_groups, []string{"description"})
	printError(err)
	log.Info("Modifications groups faites")

	//Check if the attributes are correct:
	err = test_attributes(l,tab_AddRequest_groups, "groupOfNames", "groups")
	printError(err)
	log.Info("Les modifications ont bien été prises en compte")

	//Close the connection
	l, err = reconnect(l)
	printError(err)

	//Add users in group, search them, delete several samples and search again to be sur it's good
	err = add_user_in_groups(l, r, tab_AddRequest_users, tab_AddRequest_groups)
	printError(err)
	log.Info("Ajout d'users dans les groupes fait")

	//Close the connection
	l, err = reconnect(l)
	printError(err)

	list, err := delete_groups(l, tab_AddRequest_groups)
	printError(err)
	log.Info("groupe supprimé")


	l,err = reconnect(l)
	printError(err)

	err = check_memberOf(l, list)
	printError(err)
	log.Info("Le memberOf a été correctement vidé")

	//Clean: Delete all users and groups (not OU users and groups)
	err = clean(l, tab_AddRequest_users, tab_AddRequest_groups, true, false)
	printError(err)
	log.Info("Clean succes")

	return

}