package query

import (
	"context"
	"database/sql"
	errs "errors"
	"time"

	sq "github.com/Masterminds/squirrel"
	"github.com/lib/pq"
	"golang.org/x/text/language"

	"github.com/caos/zitadel/internal/api/authz"

	"github.com/caos/zitadel/internal/domain"

	"github.com/caos/zitadel/internal/errors"
	"github.com/caos/zitadel/internal/query/projection"
)

type Users struct {
	SearchResponse
	Users []*User
}

type User struct {
	ID                 string
	CreationDate       time.Time
	ChangeDate         time.Time
	ResourceOwner      string
	Sequence           uint64
	State              domain.UserState
	Type               domain.UserType
	Username           string
	LoginNames         []string
	PreferredLoginName string
	Human              *Human
	Machine            *Machine
}

type Human struct {
	FirstName         string
	LastName          string
	NickName          string
	DisplayName       string
	AvatarKey         string
	PreferredLanguage language.Tag
	Gender            domain.Gender
	Email             string
	IsEmailVerified   bool
	Phone             string
	IsPhoneVerified   bool
}

type Profile struct {
	ID                string
	CreationDate      time.Time
	ChangeDate        time.Time
	ResourceOwner     string
	Sequence          uint64
	FirstName         string
	LastName          string
	NickName          string
	DisplayName       string
	AvatarKey         string
	PreferredLanguage language.Tag
	Gender            domain.Gender
}

type Email struct {
	ID            string
	CreationDate  time.Time
	ChangeDate    time.Time
	ResourceOwner string
	Sequence      uint64
	Email         string
	IsVerified    bool
}

type Phone struct {
	ID            string
	CreationDate  time.Time
	ChangeDate    time.Time
	ResourceOwner string
	Sequence      uint64
	Phone         string
	IsVerified    bool
}

type Machine struct {
	Name        string
	Description string
}

type UserSearchQueries struct {
	SearchRequest
	Queries []SearchQuery
}

var (
	userTable = table{
		name: projection.UserTable,
	}
	UserIDCol = Column{
		name:  projection.UserIDCol,
		table: userTable,
	}
	UserCreationDateCol = Column{
		name:  projection.UserCreationDateCol,
		table: userTable,
	}
	UserChangeDateCol = Column{
		name:  projection.UserChangeDateCol,
		table: userTable,
	}
	UserResourceOwnerCol = Column{
		name:  projection.UserResourceOwnerCol,
		table: userTable,
	}
	UserInstanceIDCol = Column{
		name:  projection.UserInstanceIDCol,
		table: userTable,
	}
	UserStateCol = Column{
		name:  projection.UserStateCol,
		table: userTable,
	}
	UserSequenceCol = Column{
		name:  projection.UserSequenceCol,
		table: userTable,
	}
	UserUsernameCol = Column{
		name:  projection.UserUsernameCol,
		table: userTable,
	}
	UserTypeCol = Column{
		name:  projection.UserTypeCol,
		table: userTable,
	}

	userLoginNamesTable         = loginNameTable.setAlias("login_names")
	userLoginNamesUserIDCol     = LoginNameUserIDCol.setTable(userLoginNamesTable)
	userLoginNamesNameCol       = LoginNameNameCol.setTable(userLoginNamesTable)
	userLoginNamesInstanceIDCol = LoginNameInstanceIDCol.setTable(userLoginNamesTable)
	userLoginNamesListCol       = Column{
		name:  "loginnames",
		table: userLoginNamesTable,
	}
	userPreferredLoginNameTable         = loginNameTable.setAlias("preferred_login_name")
	userPreferredLoginNameUserIDCol     = LoginNameUserIDCol.setTable(userPreferredLoginNameTable)
	userPreferredLoginNameCol           = LoginNameNameCol.setTable(userPreferredLoginNameTable)
	userPreferredLoginNameIsPrimaryCol  = LoginNameIsPrimaryCol.setTable(userPreferredLoginNameTable)
	userPreferredLoginNameInstanceIDCol = LoginNameInstanceIDCol.setTable(userPreferredLoginNameTable)
)

var (
	humanTable = table{
		name: projection.UserHumanTable,
	}
	// profile
	HumanUserIDCol = Column{
		name:  projection.HumanUserIDCol,
		table: humanTable,
	}
	HumanFirstNameCol = Column{
		name:  projection.HumanFirstNameCol,
		table: humanTable,
	}
	HumanLastNameCol = Column{
		name:  projection.HumanLastNameCol,
		table: humanTable,
	}
	HumanNickNameCol = Column{
		name:  projection.HumanNickNameCol,
		table: humanTable,
	}
	HumanDisplayNameCol = Column{
		name:  projection.HumanDisplayNameCol,
		table: humanTable,
	}
	HumanPreferredLanguageCol = Column{
		name:  projection.HumanPreferredLanguageCol,
		table: humanTable,
	}
	HumanGenderCol = Column{
		name:  projection.HumanGenderCol,
		table: humanTable,
	}
	HumanAvatarURLCol = Column{
		name:  projection.HumanAvatarURLCol,
		table: humanTable,
	}

	// email
	HumanEmailCol = Column{
		name:  projection.HumanEmailCol,
		table: humanTable,
	}
	HumanIsEmailVerifiedCol = Column{
		name:  projection.HumanIsEmailVerifiedCol,
		table: humanTable,
	}

	// phone
	HumanPhoneCol = Column{
		name:  projection.HumanPhoneCol,
		table: humanTable,
	}
	HumanIsPhoneVerifiedCol = Column{
		name:  projection.HumanIsPhoneVerifiedCol,
		table: humanTable,
	}
)

var (
	machineTable = table{
		name: projection.UserMachineTable,
	}
	MachineUserIDCol = Column{
		name:  projection.MachineUserIDCol,
		table: machineTable,
	}
	MachineNameCol = Column{
		name:  projection.MachineNameCol,
		table: machineTable,
	}
	MachineDescriptionCol = Column{
		name:  projection.MachineDescriptionCol,
		table: machineTable,
	}
)

func (q *Queries) GetUserByID(ctx context.Context, userID string, queries ...SearchQuery) (*User, error) {
	instanceID := authz.GetInstance(ctx).InstanceID()
	query, scan := prepareUserQuery(instanceID)
	for _, q := range queries {
		query = q.toQuery(query)
	}
	stmt, args, err := query.Where(sq.Eq{
		UserIDCol.identifier():         userID,
		UserInstanceIDCol.identifier(): instanceID,
	}).ToSql()
	if err != nil {
		return nil, errors.ThrowInternal(err, "QUERY-FBg21", "Errors.Query.SQLStatment")
	}

	row := q.client.QueryRowContext(ctx, stmt, args...)
	return scan(row)
}

func (q *Queries) GetUser(ctx context.Context, queries ...SearchQuery) (*User, error) {
	instanceID := authz.GetInstance(ctx).InstanceID()
	query, scan := prepareUserQuery(instanceID)
	for _, q := range queries {
		query = q.toQuery(query)
	}
	stmt, args, err := query.Where(sq.Eq{
		UserInstanceIDCol.identifier(): instanceID,
	}).ToSql()
	if err != nil {
		return nil, errors.ThrowInternal(err, "QUERY-Dnhr2", "Errors.Query.SQLStatment")
	}

	row := q.client.QueryRowContext(ctx, stmt, args...)
	return scan(row)
}

func (q *Queries) GetHumanProfile(ctx context.Context, userID string, queries ...SearchQuery) (*Profile, error) {
	query, scan := prepareProfileQuery()
	for _, q := range queries {
		query = q.toQuery(query)
	}
	stmt, args, err := query.Where(sq.Eq{
		UserIDCol.identifier():         userID,
		UserInstanceIDCol.identifier(): authz.GetInstance(ctx).InstanceID(),
	}).ToSql()
	if err != nil {
		return nil, errors.ThrowInternal(err, "QUERY-Dgbg2", "Errors.Query.SQLStatment")
	}

	row := q.client.QueryRowContext(ctx, stmt, args...)
	return scan(row)
}

func (q *Queries) GetHumanEmail(ctx context.Context, userID string, queries ...SearchQuery) (*Email, error) {
	query, scan := prepareEmailQuery()
	for _, q := range queries {
		query = q.toQuery(query)
	}
	stmt, args, err := query.Where(sq.Eq{
		UserIDCol.identifier():         userID,
		UserInstanceIDCol.identifier(): authz.GetInstance(ctx).InstanceID(),
	}).ToSql()
	if err != nil {
		return nil, errors.ThrowInternal(err, "QUERY-BHhj3", "Errors.Query.SQLStatment")
	}

	row := q.client.QueryRowContext(ctx, stmt, args...)
	return scan(row)
}

func (q *Queries) GetHumanPhone(ctx context.Context, userID string, queries ...SearchQuery) (*Phone, error) {
	query, scan := preparePhoneQuery()
	for _, q := range queries {
		query = q.toQuery(query)
	}
	stmt, args, err := query.Where(sq.Eq{
		UserIDCol.identifier():         userID,
		UserInstanceIDCol.identifier(): authz.GetInstance(ctx).InstanceID(),
	}).ToSql()
	if err != nil {
		return nil, errors.ThrowInternal(err, "QUERY-Dg43g", "Errors.Query.SQLStatment")
	}

	row := q.client.QueryRowContext(ctx, stmt, args...)
	return scan(row)
}

func (q *Queries) SearchUsers(ctx context.Context, queries *UserSearchQueries) (*Users, error) {
	query, scan := prepareUsersQuery()
	stmt, args, err := queries.toQuery(query).
		Where(sq.Eq{
			UserInstanceIDCol.identifier(): authz.GetInstance(ctx).InstanceID(),
		}).ToSql()
	if err != nil {
		return nil, errors.ThrowInternal(err, "QUERY-Dgbg2", "Errors.Query.SQLStatment")
	}

	rows, err := q.client.QueryContext(ctx, stmt, args...)
	if err != nil {
		return nil, errors.ThrowInternal(err, "QUERY-AG4gs", "Errors.Internal")
	}
	users, err := scan(rows)
	if err != nil {
		return nil, err
	}
	users.LatestSequence, err = q.latestSequence(ctx, userTable)
	return users, err
}

func (q *Queries) IsUserUnique(ctx context.Context, username, email, resourceOwner string) (bool, error) {
	query, scan := prepareUserUniqueQuery()
	queries := make([]SearchQuery, 0, 3)
	if username != "" {
		usernameQuery, err := NewUserUsernameSearchQuery(username, TextEquals)
		if err != nil {
			return false, err
		}
		queries = append(queries, usernameQuery)
	}
	if email != "" {
		emailQuery, err := NewUserEmailSearchQuery(email, TextEquals)
		if err != nil {
			return false, err
		}
		queries = append(queries, emailQuery)
	}
	if resourceOwner != "" {
		resourceOwnerQuery, err := NewUserResourceOwnerSearchQuery(resourceOwner, TextEquals)
		if err != nil {
			return false, err
		}
		queries = append(queries, resourceOwnerQuery)
	}
	for _, q := range queries {
		query = q.toQuery(query)
	}
	stmt, args, err := query.Where(sq.Eq{
		UserInstanceIDCol.identifier(): authz.GetInstance(ctx).InstanceID(),
	}).ToSql()
	if err != nil {
		return false, errors.ThrowInternal(err, "QUERY-Dg43g", "Errors.Query.SQLStatment")
	}
	row := q.client.QueryRowContext(ctx, stmt, args...)
	return scan(row)
}

func (q *UserSearchQueries) toQuery(query sq.SelectBuilder) sq.SelectBuilder {
	query = q.SearchRequest.toQuery(query)
	for _, q := range q.Queries {
		query = q.toQuery(query)
	}
	return query
}

func (r *UserSearchQueries) AppendMyResourceOwnerQuery(orgID string) error {
	query, err := NewUserResourceOwnerSearchQuery(orgID, TextEquals)
	if err != nil {
		return err
	}
	r.Queries = append(r.Queries, query)
	return nil
}

func NewUserResourceOwnerSearchQuery(value string, comparison TextComparison) (SearchQuery, error) {
	return NewTextQuery(UserResourceOwnerCol, value, comparison)
}

func NewUserUsernameSearchQuery(value string, comparison TextComparison) (SearchQuery, error) {
	return NewTextQuery(UserUsernameCol, value, comparison)
}

func NewUserFirstNameSearchQuery(value string, comparison TextComparison) (SearchQuery, error) {
	return NewTextQuery(HumanFirstNameCol, value, comparison)
}

func NewUserLastNameSearchQuery(value string, comparison TextComparison) (SearchQuery, error) {
	return NewTextQuery(HumanLastNameCol, value, comparison)
}

func NewUserNickNameSearchQuery(value string, comparison TextComparison) (SearchQuery, error) {
	return NewTextQuery(HumanNickNameCol, value, comparison)
}

func NewUserDisplayNameSearchQuery(value string, comparison TextComparison) (SearchQuery, error) {
	return NewTextQuery(HumanDisplayNameCol, value, comparison)
}

func NewUserEmailSearchQuery(value string, comparison TextComparison) (SearchQuery, error) {
	return NewTextQuery(HumanEmailCol, value, comparison)
}

func NewUserStateSearchQuery(value int32) (SearchQuery, error) {
	return NewNumberQuery(UserStateCol, value, NumberEquals)
}

func NewUserTypeSearchQuery(value int32) (SearchQuery, error) {
	return NewNumberQuery(UserTypeCol, value, NumberEquals)
}

func NewUserPreferredLoginNameSearchQuery(value string, comparison TextComparison) (SearchQuery, error) {
	return NewTextQuery(userPreferredLoginNameCol, value, comparison)
}

func NewUserLoginNamesSearchQuery(value string) (SearchQuery, error) {
	return NewTextQuery(userLoginNamesListCol, value, TextListContains)
}

func prepareUserQuery(instanceID string) (sq.SelectBuilder, func(*sql.Row) (*User, error)) {
	loginNamesQuery, loginNamesArgs, err := sq.Select(
		userLoginNamesUserIDCol.identifier(),
		"ARRAY_AGG("+userLoginNamesNameCol.identifier()+") as "+userLoginNamesListCol.name).
		From(userLoginNamesTable.identifier()).
		GroupBy(userLoginNamesUserIDCol.identifier()).
		Where(sq.Eq{
			userLoginNamesInstanceIDCol.identifier(): instanceID,
		}).ToSql()
	if err != nil {
		return sq.SelectBuilder{}, nil
	}
	preferredLoginNameQuery, preferredLoginNameArgs, err := sq.Select(
		userPreferredLoginNameUserIDCol.identifier(),
		userPreferredLoginNameCol.identifier()).
		From(userPreferredLoginNameTable.identifier()).
		Where(sq.Eq{
			userPreferredLoginNameIsPrimaryCol.identifier():  true,
			userPreferredLoginNameInstanceIDCol.identifier(): instanceID,
		}).ToSql()
	if err != nil {
		return sq.SelectBuilder{}, nil
	}
	return sq.Select(
			UserIDCol.identifier(),
			UserCreationDateCol.identifier(),
			UserChangeDateCol.identifier(),
			UserResourceOwnerCol.identifier(),
			UserSequenceCol.identifier(),
			UserStateCol.identifier(),
			UserTypeCol.identifier(),
			UserUsernameCol.identifier(),
			userLoginNamesListCol.identifier(),
			userPreferredLoginNameCol.identifier(),
			HumanUserIDCol.identifier(),
			HumanFirstNameCol.identifier(),
			HumanLastNameCol.identifier(),
			HumanNickNameCol.identifier(),
			HumanDisplayNameCol.identifier(),
			HumanPreferredLanguageCol.identifier(),
			HumanGenderCol.identifier(),
			HumanAvatarURLCol.identifier(),
			HumanEmailCol.identifier(),
			HumanIsEmailVerifiedCol.identifier(),
			HumanPhoneCol.identifier(),
			HumanIsPhoneVerifiedCol.identifier(),
			MachineUserIDCol.identifier(),
			MachineNameCol.identifier(),
			MachineDescriptionCol.identifier(),
		).
			From(userTable.identifier()).
			LeftJoin(join(HumanUserIDCol, UserIDCol)).
			LeftJoin(join(MachineUserIDCol, UserIDCol)).
			LeftJoin("("+loginNamesQuery+") as "+userLoginNamesTable.alias+" on "+userLoginNamesUserIDCol.identifier()+" = "+UserIDCol.identifier(), loginNamesArgs...).
			LeftJoin("("+preferredLoginNameQuery+") as "+userPreferredLoginNameTable.alias+" on "+userPreferredLoginNameUserIDCol.identifier()+" = "+UserIDCol.identifier(), preferredLoginNameArgs...).
			PlaceholderFormat(sq.Dollar),
		func(row *sql.Row) (*User, error) {
			u := new(User)
			loginNames := pq.StringArray{}
			preferredLoginName := sql.NullString{}

			humanID := sql.NullString{}
			firstName := sql.NullString{}
			lastName := sql.NullString{}
			nickName := sql.NullString{}
			displayName := sql.NullString{}
			preferredLanguage := sql.NullString{}
			gender := sql.NullInt32{}
			avatarKey := sql.NullString{}
			email := sql.NullString{}
			isEmailVerified := sql.NullBool{}
			phone := sql.NullString{}
			isPhoneVerified := sql.NullBool{}

			machineID := sql.NullString{}
			name := sql.NullString{}
			description := sql.NullString{}

			err := row.Scan(
				&u.ID,
				&u.CreationDate,
				&u.ChangeDate,
				&u.ResourceOwner,
				&u.Sequence,
				&u.State,
				&u.Type,
				&u.Username,
				&loginNames,
				&preferredLoginName,
				&humanID,
				&firstName,
				&lastName,
				&nickName,
				&displayName,
				&preferredLanguage,
				&gender,
				&avatarKey,
				&email,
				&isEmailVerified,
				&phone,
				&isPhoneVerified,
				&machineID,
				&name,
				&description,
			)

			if err != nil {
				if errs.Is(err, sql.ErrNoRows) {
					return nil, errors.ThrowNotFound(err, "QUERY-Dfbg2", "Errors.User.NotFound")
				}
				return nil, errors.ThrowInternal(err, "QUERY-Bgah2", "Errors.Internal")
			}

			u.LoginNames = loginNames
			if preferredLoginName.Valid {
				u.PreferredLoginName = preferredLoginName.String
			}
			if humanID.Valid {
				u.Human = &Human{
					FirstName:         firstName.String,
					LastName:          lastName.String,
					NickName:          nickName.String,
					DisplayName:       displayName.String,
					AvatarKey:         avatarKey.String,
					PreferredLanguage: language.Make(preferredLanguage.String),
					Gender:            domain.Gender(gender.Int32),
					Email:             email.String,
					IsEmailVerified:   isEmailVerified.Bool,
					Phone:             phone.String,
					IsPhoneVerified:   isPhoneVerified.Bool,
				}
			} else if machineID.Valid {
				u.Machine = &Machine{
					Name:        name.String,
					Description: description.String,
				}
			}
			return u, nil
		}
}

func prepareProfileQuery() (sq.SelectBuilder, func(*sql.Row) (*Profile, error)) {
	return sq.Select(
			UserIDCol.identifier(),
			UserCreationDateCol.identifier(),
			UserChangeDateCol.identifier(),
			UserResourceOwnerCol.identifier(),
			UserSequenceCol.identifier(),
			HumanUserIDCol.identifier(),
			HumanFirstNameCol.identifier(),
			HumanLastNameCol.identifier(),
			HumanNickNameCol.identifier(),
			HumanDisplayNameCol.identifier(),
			HumanPreferredLanguageCol.identifier(),
			HumanGenderCol.identifier(),
			HumanAvatarURLCol.identifier()).
			From(userTable.identifier()).
			LeftJoin(join(HumanUserIDCol, UserIDCol)).
			PlaceholderFormat(sq.Dollar),
		func(row *sql.Row) (*Profile, error) {
			p := new(Profile)

			humanID := sql.NullString{}
			firstName := sql.NullString{}
			lastName := sql.NullString{}
			nickName := sql.NullString{}
			displayName := sql.NullString{}
			preferredLanguage := sql.NullString{}
			gender := sql.NullInt32{}
			avatarKey := sql.NullString{}
			err := row.Scan(
				&p.ID,
				&p.CreationDate,
				&p.ChangeDate,
				&p.ResourceOwner,
				&p.Sequence,
				&humanID,
				&firstName,
				&lastName,
				&nickName,
				&displayName,
				&preferredLanguage,
				&gender,
				&avatarKey,
			)
			if err != nil {
				if errs.Is(err, sql.ErrNoRows) {
					return nil, errors.ThrowNotFound(err, "QUERY-HNhb3", "Errors.User.NotFound")
				}
				return nil, errors.ThrowInternal(err, "QUERY-Rfheq", "Errors.Internal")
			}
			if !humanID.Valid {
				return nil, errors.ThrowPreconditionFailed(nil, "QUERY-WLTce", "Errors.User.NotHuman")
			}

			p.FirstName = firstName.String
			p.LastName = lastName.String
			p.NickName = nickName.String
			p.DisplayName = displayName.String
			p.AvatarKey = avatarKey.String
			p.PreferredLanguage = language.Make(preferredLanguage.String)
			p.Gender = domain.Gender(gender.Int32)

			return p, nil
		}
}

func prepareEmailQuery() (sq.SelectBuilder, func(*sql.Row) (*Email, error)) {
	return sq.Select(
			UserIDCol.identifier(),
			UserCreationDateCol.identifier(),
			UserChangeDateCol.identifier(),
			UserResourceOwnerCol.identifier(),
			UserSequenceCol.identifier(),
			HumanUserIDCol.identifier(),
			HumanEmailCol.identifier(),
			HumanIsEmailVerifiedCol.identifier()).
			From(userTable.identifier()).
			LeftJoin(join(HumanUserIDCol, UserIDCol)).
			PlaceholderFormat(sq.Dollar),
		func(row *sql.Row) (*Email, error) {
			e := new(Email)

			humanID := sql.NullString{}
			email := sql.NullString{}
			isEmailVerified := sql.NullBool{}

			err := row.Scan(
				&e.ID,
				&e.CreationDate,
				&e.ChangeDate,
				&e.ResourceOwner,
				&e.Sequence,
				&humanID,
				&email,
				&isEmailVerified,
			)
			if err != nil {
				if errs.Is(err, sql.ErrNoRows) {
					return nil, errors.ThrowNotFound(err, "QUERY-Hms2s", "Errors.User.NotFound")
				}
				return nil, errors.ThrowInternal(err, "QUERY-Nu42d", "Errors.Internal")
			}
			if !humanID.Valid {
				return nil, errors.ThrowPreconditionFailed(nil, "QUERY-pt7HY", "Errors.User.NotHuman")
			}

			e.Email = email.String
			e.IsVerified = isEmailVerified.Bool

			return e, nil
		}
}

func preparePhoneQuery() (sq.SelectBuilder, func(*sql.Row) (*Phone, error)) {
	return sq.Select(
			UserIDCol.identifier(),
			UserCreationDateCol.identifier(),
			UserChangeDateCol.identifier(),
			UserResourceOwnerCol.identifier(),
			UserSequenceCol.identifier(),
			HumanUserIDCol.identifier(),
			HumanPhoneCol.identifier(),
			HumanIsPhoneVerifiedCol.identifier()).
			From(userTable.identifier()).
			LeftJoin(join(HumanUserIDCol, UserIDCol)).
			PlaceholderFormat(sq.Dollar),
		func(row *sql.Row) (*Phone, error) {
			e := new(Phone)

			humanID := sql.NullString{}
			phone := sql.NullString{}
			isPhoneVerified := sql.NullBool{}

			err := row.Scan(
				&e.ID,
				&e.CreationDate,
				&e.ChangeDate,
				&e.ResourceOwner,
				&e.Sequence,
				&humanID,
				&phone,
				&isPhoneVerified,
			)
			if err != nil {
				if errs.Is(err, sql.ErrNoRows) {
					return nil, errors.ThrowNotFound(err, "QUERY-DAvb3", "Errors.User.NotFound")
				}
				return nil, errors.ThrowInternal(err, "QUERY-Bmf2h", "Errors.Internal")
			}
			if !humanID.Valid {
				return nil, errors.ThrowPreconditionFailed(nil, "QUERY-hliQl", "Errors.User.NotHuman")
			}

			e.Phone = phone.String
			e.IsVerified = isPhoneVerified.Bool

			return e, nil
		}
}

func prepareUserUniqueQuery() (sq.SelectBuilder, func(*sql.Row) (bool, error)) {
	return sq.Select(
			UserIDCol.identifier(),
			UserStateCol.identifier(),
			UserUsernameCol.identifier(),
			HumanUserIDCol.identifier(),
			HumanEmailCol.identifier(),
			HumanIsEmailVerifiedCol.identifier()).
			From(userTable.identifier()).
			LeftJoin(join(HumanUserIDCol, UserIDCol)).
			PlaceholderFormat(sq.Dollar),
		func(row *sql.Row) (bool, error) {
			userID := sql.NullString{}
			state := sql.NullInt32{}
			username := sql.NullString{}
			humanID := sql.NullString{}
			email := sql.NullString{}
			isEmailVerified := sql.NullBool{}

			err := row.Scan(
				&userID,
				&state,
				&username,
				&humanID,
				&email,
				&isEmailVerified,
			)
			if err != nil {
				if errs.Is(err, sql.ErrNoRows) {
					return true, nil
				}
				return false, errors.ThrowInternal(err, "QUERY-Cxces", "Errors.Internal")
			}
			return !userID.Valid, nil
		}
}

func prepareUsersQuery() (sq.SelectBuilder, func(*sql.Rows) (*Users, error)) {
	loginNamesQuery, _, err := sq.Select(
		userLoginNamesUserIDCol.identifier(),
		"ARRAY_AGG("+userLoginNamesNameCol.identifier()+") as "+userLoginNamesListCol.name).
		From(userLoginNamesTable.identifier()).
		GroupBy(userLoginNamesUserIDCol.identifier()).
		ToSql()
	if err != nil {
		return sq.SelectBuilder{}, nil
	}
	preferredLoginNameQuery, preferredLoginNameArgs, err := sq.Select(
		userPreferredLoginNameUserIDCol.identifier(),
		userPreferredLoginNameCol.identifier()).
		From(userPreferredLoginNameTable.identifier()).
		Where(
			sq.Eq{
				userPreferredLoginNameIsPrimaryCol.identifier(): true,
			}).ToSql()
	if err != nil {
		return sq.SelectBuilder{}, nil
	}
	return sq.Select(
			UserIDCol.identifier(),
			UserCreationDateCol.identifier(),
			UserChangeDateCol.identifier(),
			UserResourceOwnerCol.identifier(),
			UserSequenceCol.identifier(),
			UserStateCol.identifier(),
			UserTypeCol.identifier(),
			UserUsernameCol.identifier(),
			userLoginNamesListCol.identifier(),
			userPreferredLoginNameCol.identifier(),
			HumanUserIDCol.identifier(),
			HumanFirstNameCol.identifier(),
			HumanLastNameCol.identifier(),
			HumanNickNameCol.identifier(),
			HumanDisplayNameCol.identifier(),
			HumanPreferredLanguageCol.identifier(),
			HumanGenderCol.identifier(),
			HumanAvatarURLCol.identifier(),
			HumanEmailCol.identifier(),
			HumanIsEmailVerifiedCol.identifier(),
			HumanPhoneCol.identifier(),
			HumanIsPhoneVerifiedCol.identifier(),
			MachineUserIDCol.identifier(),
			MachineNameCol.identifier(),
			MachineDescriptionCol.identifier(),
			countColumn.identifier()).
			From(userTable.identifier()).
			LeftJoin(join(HumanUserIDCol, UserIDCol)).
			LeftJoin(join(MachineUserIDCol, UserIDCol)).
			LeftJoin("("+loginNamesQuery+") as "+userLoginNamesTable.alias+" on "+userLoginNamesUserIDCol.identifier()+" = "+UserIDCol.identifier()).
			LeftJoin("("+preferredLoginNameQuery+") as "+userPreferredLoginNameTable.alias+" on "+userPreferredLoginNameUserIDCol.identifier()+" = "+UserIDCol.identifier(), preferredLoginNameArgs...).
			PlaceholderFormat(sq.Dollar),
		func(rows *sql.Rows) (*Users, error) {
			users := make([]*User, 0)
			var count uint64
			for rows.Next() {
				u := new(User)
				loginNames := pq.StringArray{}
				preferredLoginName := sql.NullString{}

				humanID := sql.NullString{}
				firstName := sql.NullString{}
				lastName := sql.NullString{}
				nickName := sql.NullString{}
				displayName := sql.NullString{}
				preferredLanguage := sql.NullString{}
				gender := sql.NullInt32{}
				avatarKey := sql.NullString{}
				email := sql.NullString{}
				isEmailVerified := sql.NullBool{}
				phone := sql.NullString{}
				isPhoneVerified := sql.NullBool{}

				machineID := sql.NullString{}
				name := sql.NullString{}
				description := sql.NullString{}

				err := rows.Scan(
					&u.ID,
					&u.CreationDate,
					&u.ChangeDate,
					&u.ResourceOwner,
					&u.Sequence,
					&u.State,
					&u.Type,
					&u.Username,
					&loginNames,
					&preferredLoginName,
					&humanID,
					&firstName,
					&lastName,
					&nickName,
					&displayName,
					&preferredLanguage,
					&gender,
					&avatarKey,
					&email,
					&isEmailVerified,
					&phone,
					&isPhoneVerified,
					&machineID,
					&name,
					&description,
					&count,
				)
				if err != nil {
					return nil, err
				}

				u.LoginNames = loginNames
				if preferredLoginName.Valid {
					u.PreferredLoginName = preferredLoginName.String
				}

				if humanID.Valid {
					u.Human = &Human{
						FirstName:         firstName.String,
						LastName:          lastName.String,
						NickName:          nickName.String,
						DisplayName:       displayName.String,
						AvatarKey:         avatarKey.String,
						PreferredLanguage: language.Make(preferredLanguage.String),
						Gender:            domain.Gender(gender.Int32),
						Email:             email.String,
						IsEmailVerified:   isEmailVerified.Bool,
						Phone:             phone.String,
						IsPhoneVerified:   isPhoneVerified.Bool,
					}
				} else if machineID.Valid {
					u.Machine = &Machine{
						Name:        name.String,
						Description: description.String,
					}
				}

				users = append(users, u)
			}

			if err := rows.Close(); err != nil {
				return nil, errors.ThrowInternal(err, "QUERY-frhbd", "Errors.Query.CloseRows")
			}

			return &Users{
				Users: users,
				SearchResponse: SearchResponse{
					Count: count,
				},
			}, nil
		}
}