package web

import (
	"bytes"
	"encoding/csv"
	"fmt"
	"html/template"
	"log"
	"net/http"
	"strconv"
	"strings"
	"time"

	root "marmic/servicetrade-toolbox"
	"marmic/servicetrade-toolbox/internal/api"
	"marmic/servicetrade-toolbox/internal/middleware"

	"github.com/gorilla/csrf"
)

// RoleAssignmentResult captures the outcome of assigning a role to a user.
type RoleAssignmentResult struct {
	Token   string
	RoleID  int
	Role    string
	Success bool
	Message string
}

// UserImportResult represents the processing result for a single CSV row.
type UserImportResult struct {
	Row              int
	Username         string
	Email            string
	UserID           int
	Created          bool
	Error            string
	RoleAssignments  []RoleAssignmentResult
	ProcessingTime   time.Duration
	ServiceLineIDs   []int
	AdditionalFields map[string]string
}

// UserImportSummary aggregates statistics about a CSV import run.
type UserImportSummary struct {
	TotalRows            int
	UsersCreated         int
	RowsFailed           int
	RoleAssignments      int
	RoleAssignmentErrors int
	ProcessedFilename    string
	ProcessedAt          time.Time
}

// UserUpdateResult represents the processing result for a single update row.
type UserUpdateResult struct {
	Row             int
	Username        string
	Email           string
	UserID          int
	Updated         bool
	Error           string
	UpdatedFields   []string
	LookupMethod    string
	RoleAssignments []RoleAssignmentResult
	ProcessingTime  time.Duration
}

// UserUpdateSummary aggregates statistics about a CSV update run.
type UserUpdateSummary struct {
	TotalRows            int
	UsersUpdated         int
	RowsFailed           int
	RoleAssignments      int
	RoleAssignmentErrors int
	LookupsByUsername    int
	LookupsByID          int
	ProcessedFilename    string
	ProcessedAt          time.Time
}

// UsersHandler renders the user management page.
func UsersHandler(w http.ResponseWriter, r *http.Request) {
	session, ok := r.Context().Value(middleware.SessionKey).(*api.Session)
	if !ok {
		http.Error(w, "Unauthorized", http.StatusUnauthorized)
		return
	}

	data := baseUsersPageData(r)
	data["Title"] = "Users"
	data["Session"] = session

	if roles, err := session.ListRoles(); err != nil {
		log.Printf("UsersHandler: unable to load roles: %v", err)
		data["RolesError"] = err.Error()
	} else {
		data["Roles"] = roles
	}

	renderUsersPage(w, r, data)
}

// UsersUploadHandler processes uploaded CSV files to create users and assign roles.
func UsersUploadHandler(w http.ResponseWriter, r *http.Request) {
	start := time.Now()
	session, ok := r.Context().Value(middleware.SessionKey).(*api.Session)
	if !ok {
		http.Error(w, "Unauthorized", http.StatusUnauthorized)
		return
	}

	if err := r.ParseMultipartForm(10 << 20); err != nil {
		http.Error(w, fmt.Sprintf("Unable to parse upload: %v", err), http.StatusBadRequest)
		return
	}

	file, header, err := r.FormFile("csvFile")
	if err != nil {
		http.Error(w, fmt.Sprintf("Unable to read file: %v", err), http.StatusBadRequest)
		return
	}
	defer file.Close()

	reader := csv.NewReader(file)
	reader.FieldsPerRecord = -1
	reader.TrimLeadingSpace = true
	rows, err := reader.ReadAll()
	if err != nil {
		http.Error(w, fmt.Sprintf("Unable to read CSV: %v", err), http.StatusBadRequest)
		return
	}

	data := baseUsersPageData(r)
	data["Title"] = "Users"
	data["Session"] = session

	if len(rows) < 2 {
		data["FlashError"] = "CSV must include a header row and at least one data row."
		renderUsersPage(w, r, data)
		return
	}

	headerMap := buildHeaderIndex(rows[0])
	required := []string{"username", "firstname", "lastname", "email", "password", "companyid", "locationid"}
	if missing := missingHeaders(headerMap, required); len(missing) > 0 {
		data["FlashError"] = fmt.Sprintf("Missing required column headers: %s", strings.Join(missing, ", "))
		renderUsersPage(w, r, data)
		return
	}

	roles, rolesErr := session.ListRoles()
	if rolesErr != nil {
		log.Printf("UsersUploadHandler: unable to load roles: %v", rolesErr)
		data["RolesError"] = fmt.Sprintf("Unable to load roles: %v. Role names in the CSV will not resolve.", rolesErr)
	} else {
		data["Roles"] = roles
	}
	roleIndexByName := buildRoleNameIndex(roles)

	results := make([]UserImportResult, 0, len(rows)-1)
	summary := UserImportSummary{
		TotalRows:         len(rows) - 1,
		ProcessedAt:       time.Now(),
		ProcessedFilename: header.Filename,
	}

	for rowIdx, row := range rows[1:] {
		rowStart := time.Now()
		result := UserImportResult{
			Row:              rowIdx + 2,
			Username:         getValue(row, headerMap, "username"),
			Email:            getValue(row, headerMap, "email"),
			AdditionalFields: map[string]string{},
		}

		if rowIsEmpty(row) {
			continue
		}

		if err := validateRequiredRowFields(row, headerMap, required); err != nil {
			result.Error = err.Error()
			result.ProcessingTime = time.Since(rowStart)
			results = append(results, result)
			summary.RowsFailed++
			continue
		}

		companyID, err := strconv.Atoi(getValue(row, headerMap, "companyid"))
		if err != nil {
			result.Error = fmt.Sprintf("invalid companyId: %v", err)
			result.ProcessingTime = time.Since(rowStart)
			results = append(results, result)
			summary.RowsFailed++
			continue
		}

		locationID, err := strconv.Atoi(getValue(row, headerMap, "locationid"))
		if err != nil {
			result.Error = fmt.Sprintf("invalid locationId: %v", err)
			result.ProcessingTime = time.Since(rowStart)
			results = append(results, result)
			summary.RowsFailed++
			continue
		}

		isSales, err := parseOptionalBool(getValue(row, headerMap, "issales"))
		if err != nil {
			result.Error = fmt.Sprintf("invalid isSales value: %v", err)
			result.ProcessingTime = time.Since(rowStart)
			results = append(results, result)
			summary.RowsFailed++
			continue
		}

		mfaRequired, err := parseOptionalBool(getValue(row, headerMap, "mfarequired"))
		if err != nil {
			result.Error = fmt.Sprintf("invalid mfaRequired value: %v", err)
			result.ProcessingTime = time.Since(rowStart)
			results = append(results, result)
			summary.RowsFailed++
			continue
		}

		managerID, err := parseOptionalInt(getValue(row, headerMap, "managerid"))
		if err != nil {
			result.Error = fmt.Sprintf("invalid managerId value: %v", err)
			result.ProcessingTime = time.Since(rowStart)
			results = append(results, result)
			summary.RowsFailed++
			continue
		}

		serviceLineIDs, err := parseIntList(getValue(row, headerMap, "servicelineids"))
		if err != nil {
			result.Error = fmt.Sprintf("invalid serviceLineIds value: %v", err)
			result.ProcessingTime = time.Since(rowStart)
			results = append(results, result)
			summary.RowsFailed++
			continue
		}
		result.ServiceLineIDs = serviceLineIDs

		payload := api.CreateUserPayload{
			Username:       result.Username,
			FirstName:      getValue(row, headerMap, "firstname"),
			LastName:       getValue(row, headerMap, "lastname"),
			Password:       getValue(row, headerMap, "password"),
			Email:          result.Email,
			Phone:          getValue(row, headerMap, "phone"),
			CompanyID:      companyID,
			LocationID:     locationID,
			Details:        getValue(row, headerMap, "details"),
			Status:         getValue(row, headerMap, "status"),
			Timezone:       getValue(row, headerMap, "timezone"),
			ServiceLineIDs: serviceLineIDs,
		}

		if isSales != nil {
			payload.IsSales = isSales
		}
		if mfaRequired != nil {
			payload.MFARequired = mfaRequired
		}
		if managerID != nil {
			payload.ManagerID = managerID
		}

		userRecord, err := session.CreateUser(payload)
		if err != nil {
			result.Error = fmt.Sprintf("failed to create user: %v", err)
			result.ProcessingTime = time.Since(rowStart)
			results = append(results, result)
			summary.RowsFailed++
			continue
		}

		result.Created = true
		result.UserID = userRecord.ID
		summary.UsersCreated++

		roleTokens := parseRoleTokens(getValue(row, headerMap, "roles"))
		if len(roleTokens) > 0 {
			assignments := make([]RoleAssignmentResult, 0, len(roleTokens))
			for _, token := range roleTokens {
				assignResult := RoleAssignmentResult{Token: token}
				role, resolved, message := resolveRoleToken(token, roleIndexByName)
				if !resolved {
					assignResult.Message = message
					assignments = append(assignments, assignResult)
					summary.RoleAssignmentErrors++
					continue
				}
				assignResult.RoleID = role.ID
				assignResult.Role = role.Name

				if err := session.AssignRoleToUser(userRecord.ID, role.ID); err != nil {
					assignResult.Message = fmt.Sprintf("failed to assign role: %v", err)
					summary.RoleAssignmentErrors++
				} else {
					assignResult.Success = true
					assignResult.Message = "assigned"
					summary.RoleAssignments++
				}
				assignments = append(assignments, assignResult)
			}
			result.RoleAssignments = assignments
		}

		result.ProcessingTime = time.Since(rowStart)
		results = append(results, result)
	}

	data["ImportResults"] = results
	data["ImportSummary"] = summary
	data["FlashSuccess"] = fmt.Sprintf("Processed %d row(s) in %s.", summary.TotalRows, time.Since(start).Round(time.Millisecond))

	renderUsersPage(w, r, data)
}

// UsersUpdateHandler renders the user update page.
func UsersUpdateHandler(w http.ResponseWriter, r *http.Request) {
	session, ok := r.Context().Value(middleware.SessionKey).(*api.Session)
	if !ok {
		http.Error(w, "Unauthorized", http.StatusUnauthorized)
		return
	}

	data := baseUsersPageData(r)
	data["Title"] = "User Updates"
	data["Session"] = session

	if roles, err := session.ListRoles(); err != nil {
		log.Printf("UsersUpdateHandler: unable to load roles: %v", err)
		data["RolesError"] = err.Error()
	} else {
		data["Roles"] = roles
	}

	renderUsersUpdatePage(w, r, data)
}

// UsersUpdateUploadHandler processes CSV uploads to update existing users.
func UsersUpdateUploadHandler(w http.ResponseWriter, r *http.Request) {
	start := time.Now()
	session, ok := r.Context().Value(middleware.SessionKey).(*api.Session)
	if !ok {
		http.Error(w, "Unauthorized", http.StatusUnauthorized)
		return
	}

	if err := r.ParseMultipartForm(10 << 20); err != nil {
		http.Error(w, fmt.Sprintf("Unable to parse upload: %v", err), http.StatusBadRequest)
		return
	}

	file, header, err := r.FormFile("csvFile")
	if err != nil {
		http.Error(w, fmt.Sprintf("Unable to read file: %v", err), http.StatusBadRequest)
		return
	}
	defer file.Close()

	reader := csv.NewReader(file)
	reader.FieldsPerRecord = -1
	reader.TrimLeadingSpace = true
	rows, err := reader.ReadAll()
	if err != nil {
		http.Error(w, fmt.Sprintf("Unable to read CSV: %v", err), http.StatusBadRequest)
		return
	}

	data := baseUsersPageData(r)
	data["Title"] = "User Updates"
	data["Session"] = session

	if len(rows) < 2 {
		data["FlashError"] = "CSV must include a header row and at least one data row."
		renderUsersUpdatePage(w, r, data)
		return
	}

	headerMap := buildHeaderIndex(rows[0])
	if _, ok := headerMap["username"]; !ok {
		if _, ok := headerMap["userid"]; !ok {
			data["FlashError"] = "CSV must include either a username or userId column to locate users."
			renderUsersUpdatePage(w, r, data)
			return
		}
	}

	roles, rolesErr := session.ListRoles()
	if rolesErr != nil {
		log.Printf("UsersUpdateUploadHandler: unable to load roles: %v", rolesErr)
		data["RolesError"] = fmt.Sprintf("Unable to load roles: %v. Role names in the CSV will not resolve.", rolesErr)
	} else {
		data["Roles"] = roles
	}
	roleIndexByName := buildRoleNameIndex(roles)

	results := make([]UserUpdateResult, 0, len(rows)-1)
	summary := UserUpdateSummary{
		TotalRows:         len(rows) - 1,
		ProcessedAt:       time.Now(),
		ProcessedFilename: header.Filename,
	}

	for rowIdx, row := range rows[1:] {
		rowStart := time.Now()
		if rowIsEmpty(row) {
			continue
		}

		result := UserUpdateResult{
			Row:      rowIdx + 2,
			Username: getValue(row, headerMap, "username"),
			Email:    getValue(row, headerMap, "email"),
		}

		userIDValue := getValue(row, headerMap, "userid")
		var userID int
		if userIDValue != "" {
			parsedID, err := strconv.Atoi(userIDValue)
			if err != nil || parsedID <= 0 {
				result.Error = fmt.Sprintf("invalid userId: %v", err)
				result.ProcessingTime = time.Since(rowStart)
				results = append(results, result)
				summary.RowsFailed++
				continue
			}
			userID = parsedID
			result.UserID = userID
			result.LookupMethod = "userId"
			summary.LookupsByID++
		} else if result.Username != "" {
			userRecord, err := session.FindUserByUsername(result.Username)
			if err != nil {
				result.Error = fmt.Sprintf("failed to locate user by username: %v", err)
				result.ProcessingTime = time.Since(rowStart)
				results = append(results, result)
				summary.RowsFailed++
				continue
			}
			userID = userRecord.ID
			result.UserID = userID
			result.LookupMethod = "username"
			summary.LookupsByUsername++
		} else {
			result.Error = "row missing username and userId"
			result.ProcessingTime = time.Since(rowStart)
			results = append(results, result)
			summary.RowsFailed++
			continue
		}

		payload := api.UpdateUserPayload{}
		var updatedFields []string

		if v := getValue(row, headerMap, "firstname"); v != "" {
			payload.FirstName = stringPtr(v)
			updatedFields = append(updatedFields, "firstName")
		}
		if v := getValue(row, headerMap, "new_username"); v != "" {
			payload.Username = stringPtr(v)
			updatedFields = append(updatedFields, "username")
		}
		if v := getValue(row, headerMap, "lastname"); v != "" {
			payload.LastName = stringPtr(v)
			updatedFields = append(updatedFields, "lastName")
		}
		if v := getValue(row, headerMap, "email"); v != "" {
			payload.Email = stringPtr(v)
			updatedFields = append(updatedFields, "email")
		}
		if v := getValue(row, headerMap, "password"); v != "" {
			payload.Password = stringPtr(v)
			updatedFields = append(updatedFields, "password")
		}
		if v := getValue(row, headerMap, "phone"); v != "" {
			payload.Phone = stringPtr(v)
			updatedFields = append(updatedFields, "phone")
		}
		if v := getValue(row, headerMap, "details"); v != "" {
			payload.Details = stringPtr(v)
			updatedFields = append(updatedFields, "details")
		}
		if v := getValue(row, headerMap, "status"); v != "" {
			payload.Status = stringPtr(v)
			updatedFields = append(updatedFields, "status")
		}
		if v := getValue(row, headerMap, "timezone"); v != "" {
			payload.Timezone = stringPtr(v)
			updatedFields = append(updatedFields, "timezone")
		}
		if companyVal := getValue(row, headerMap, "companyid"); companyVal != "" {
			companyID, err := strconv.Atoi(companyVal)
			if err != nil {
				result.Error = fmt.Sprintf("invalid companyId: %v", err)
				result.ProcessingTime = time.Since(rowStart)
				results = append(results, result)
				summary.RowsFailed++
				continue
			}
			payload.CompanyID = intPtr(companyID)
			updatedFields = append(updatedFields, "companyId")
		}
		if locationVal := getValue(row, headerMap, "locationid"); locationVal != "" {
			locationID, err := strconv.Atoi(locationVal)
			if err != nil {
				result.Error = fmt.Sprintf("invalid locationId: %v", err)
				result.ProcessingTime = time.Since(rowStart)
				results = append(results, result)
				summary.RowsFailed++
				continue
			}
			payload.LocationID = intPtr(locationID)
			updatedFields = append(updatedFields, "locationId")
		}
		if managerVal := getValue(row, headerMap, "managerid"); managerVal != "" {
			managerID, err := strconv.Atoi(managerVal)
			if err != nil {
				result.Error = fmt.Sprintf("invalid managerId: %v", err)
				result.ProcessingTime = time.Since(rowStart)
				results = append(results, result)
				summary.RowsFailed++
				continue
			}
			payload.ManagerID = intPtr(managerID)
			updatedFields = append(updatedFields, "managerId")
		}

		if isSales, err := parseOptionalBool(getValue(row, headerMap, "issales")); err != nil {
			result.Error = fmt.Sprintf("invalid isSales value: %v", err)
			result.ProcessingTime = time.Since(rowStart)
			results = append(results, result)
			summary.RowsFailed++
			continue
		} else if isSales != nil {
			payload.IsSales = isSales
			updatedFields = append(updatedFields, "isSales")
		}

		if mfaRequired, err := parseOptionalBool(getValue(row, headerMap, "mfarequired")); err != nil {
			result.Error = fmt.Sprintf("invalid mfaRequired value: %v", err)
			result.ProcessingTime = time.Since(rowStart)
			results = append(results, result)
			summary.RowsFailed++
			continue
		} else if mfaRequired != nil {
			payload.MFARequired = mfaRequired
			updatedFields = append(updatedFields, "mfaRequired")
		}

		if serviceLineIDs, err := parseIntList(getValue(row, headerMap, "servicelineids")); err != nil {
			result.Error = fmt.Sprintf("invalid serviceLineIds value: %v", err)
			result.ProcessingTime = time.Since(rowStart)
			results = append(results, result)
			summary.RowsFailed++
			continue
		} else if serviceLineIDs != nil {
			payload.ServiceLineIDs = &serviceLineIDs
			updatedFields = append(updatedFields, "serviceLineIds")
		}

		if len(updatedFields) == 0 {
			result.Error = "no updatable fields provided in row"
			result.ProcessingTime = time.Since(rowStart)
			results = append(results, result)
			summary.RowsFailed++
			continue
		}

		if _, err := session.UpdateUser(userID, payload); err != nil {
			result.Error = fmt.Sprintf("failed to update user: %v", err)
			result.ProcessingTime = time.Since(rowStart)
			results = append(results, result)
			summary.RowsFailed++
			continue
		}

		result.Updated = true
		result.UpdatedFields = updatedFields
		summary.UsersUpdated++

		roleTokens := parseRoleTokens(getValue(row, headerMap, "roles"))
		if len(roleTokens) > 0 {
			assignments := make([]RoleAssignmentResult, 0, len(roleTokens))
			for _, token := range roleTokens {
				assignResult := RoleAssignmentResult{Token: token}
				role, resolved, message := resolveRoleToken(token, roleIndexByName)
				if !resolved {
					assignResult.Message = message
					assignments = append(assignments, assignResult)
					summary.RoleAssignmentErrors++
					continue
				}
				assignResult.RoleID = role.ID
				assignResult.Role = role.Name

				if err := session.AssignRoleToUser(userID, role.ID); err != nil {
					assignResult.Message = fmt.Sprintf("failed to assign role: %v", err)
					summary.RoleAssignmentErrors++
				} else {
					assignResult.Success = true
					assignResult.Message = "assigned"
					summary.RoleAssignments++
				}
				assignments = append(assignments, assignResult)
			}
			result.RoleAssignments = assignments
		}

		result.ProcessingTime = time.Since(rowStart)
		results = append(results, result)
	}

	data["UpdateResults"] = results
	data["UpdateSummary"] = summary
	if summary.UsersUpdated > 0 {
		data["FlashSuccess"] = fmt.Sprintf("Updated %d user(s) (processed %d rows in %s).", summary.UsersUpdated, summary.TotalRows, time.Since(start).Round(time.Millisecond))
	} else {
		data["FlashError"] = "No users were updated. Review the row errors below."
	}

	renderUsersUpdatePage(w, r, data)
}

func renderUsersPage(w http.ResponseWriter, r *http.Request, data map[string]interface{}) {
	renderUsersTemplatePage(w, r, data, "users_content")
}

func renderUsersUpdatePage(w http.ResponseWriter, r *http.Request, data map[string]interface{}) {
	renderUsersTemplatePage(w, r, data, "users_update_content")
}

func renderUsersTemplatePage(w http.ResponseWriter, r *http.Request, data map[string]interface{}, templateName string) {
	tmpl := root.WebTemplates

	if r.Header.Get("HX-Request") == "true" {
		if err := tmpl.ExecuteTemplate(w, templateName, data); err != nil {
			log.Printf("UsersHandler: template error: %v", err)
			http.Error(w, "Internal Server Error", http.StatusInternalServerError)
		}
		return
	}

	var contentBuf bytes.Buffer
	if err := tmpl.ExecuteTemplate(&contentBuf, templateName, data); err != nil {
		log.Printf("UsersHandler: template error: %v", err)
		http.Error(w, "Internal Server Error", http.StatusInternalServerError)
		return
	}
	data["BodyContent"] = template.HTML(contentBuf.String())

	if err := tmpl.ExecuteTemplate(w, "layout.html", data); err != nil {
		log.Printf("UsersHandler: layout template error: %v", err)
		http.Error(w, "Internal Server Error", http.StatusInternalServerError)
	}
}

func baseUsersPageData(r *http.Request) map[string]interface{} {
	data := map[string]interface{}{
		"CSRFField": csrf.TemplateField(r),
		"CSRFToken": csrf.Token(r),
	}
	if c, err := r.Cookie("XSRF-TOKEN"); err == nil {
		data["CSRFCookie"] = c.Value
	} else if c, err := r.Cookie("XSRF-TOKEN-VALUE"); err == nil {
		data["CSRFCookie"] = c.Value
	}
	return data
}

func buildHeaderIndex(headers []string) map[string]int {
	index := make(map[string]int, len(headers))
	for idx, header := range headers {
		if header == "" {
			continue
		}
		normalized := normalizeHeader(header)
		if canonical, ok := headerCanonicalMap[normalized]; ok {
			index[canonical] = idx
		} else {
			index[normalized] = idx
		}
	}
	return index
}

func missingHeaders(headerIndex map[string]int, required []string) []string {
	var missing []string
	for _, key := range required {
		if _, ok := headerIndex[key]; !ok {
			missing = append(missing, key)
		}
	}
	return missing
}

func rowIsEmpty(row []string) bool {
	for _, value := range row {
		if strings.TrimSpace(value) != "" {
			return false
		}
	}
	return true
}

func validateRequiredRowFields(row []string, index map[string]int, required []string) error {
	var missing []string
	for _, key := range required {
		if strings.TrimSpace(getValue(row, index, key)) == "" {
			missing = append(missing, key)
		}
	}
	if len(missing) > 0 {
		return fmt.Errorf("missing required value(s): %s", strings.Join(missing, ", "))
	}
	return nil
}

func getValue(row []string, index map[string]int, key string) string {
	if idx, ok := index[key]; ok && idx < len(row) {
		return strings.TrimSpace(row[idx])
	}
	return ""
}

func parseOptionalBool(value string) (*bool, error) {
	if value == "" {
		return nil, nil
	}
	switch strings.ToLower(strings.TrimSpace(value)) {
	case "true", "1", "yes", "y":
		result := true
		return &result, nil
	case "false", "0", "no", "n":
		result := false
		return &result, nil
	default:
		return nil, fmt.Errorf("expected boolean value, got %q", value)
	}
}

func parseOptionalInt(value string) (*int, error) {
	if strings.TrimSpace(value) == "" {
		return nil, nil
	}
	intVal, err := strconv.Atoi(strings.TrimSpace(value))
	if err != nil {
		return nil, err
	}
	return &intVal, nil
}

func parseIntList(raw string) ([]int, error) {
	if strings.TrimSpace(raw) == "" {
		return nil, nil
	}
	parts := splitTokens(raw)
	ints := make([]int, 0, len(parts))
	for _, part := range parts {
		id, err := strconv.Atoi(part)
		if err != nil {
			return nil, fmt.Errorf("invalid integer %q", part)
		}
		ints = append(ints, id)
	}
	return ints, nil
}

func parseRoleTokens(raw string) []string {
	if strings.TrimSpace(raw) == "" {
		return nil
	}
	return splitTokens(raw)
}

func splitTokens(raw string) []string {
	cleaned := strings.NewReplacer(";", ",", "|", ",").Replace(raw)
	parts := strings.Split(cleaned, ",")
	result := make([]string, 0, len(parts))
	for _, part := range parts {
		token := strings.TrimSpace(part)
		if token != "" {
			result = append(result, token)
		}
	}
	return result
}

func resolveRoleToken(token string, nameIndex map[string]api.Role) (api.Role, bool, string) {
	clean := strings.TrimSpace(token)
	if clean == "" {
		return api.Role{}, false, "empty role token"
	}
	normalized := normalizeRoleName(clean)
	if role, ok := nameIndex[normalized]; ok {
		return role, true, ""
	}
	return api.Role{}, false, fmt.Sprintf("role %q not found; use the role name exactly as listed", token)
}

func buildRoleNameIndex(roles []api.Role) map[string]api.Role {
	nameIndex := make(map[string]api.Role, len(roles))
	for _, role := range roles {
		nameKey := normalizeRoleName(role.Name)
		if nameKey != "" {
			nameIndex[nameKey] = role
		}
	}
	return nameIndex
}

func normalizeHeader(value string) string {
	v := strings.TrimSpace(strings.ToLower(value))
	v = strings.ReplaceAll(v, " ", "")
	v = strings.ReplaceAll(v, "_", "")
	v = strings.ReplaceAll(v, "-", "")
	return v
}

func normalizeRoleName(value string) string {
	return strings.ToLower(strings.TrimSpace(value))
}

var headerCanonicalMap = map[string]string{
	"username":       "username",
	"user":           "username",
	"firstname":      "firstname",
	"first":          "firstname",
	"lastname":       "lastname",
	"last":           "lastname",
	"email":          "email",
	"mail":           "email",
	"password":       "password",
	"pass":           "password",
	"companyid":      "companyid",
	"company":        "companyid",
	"locationid":     "locationid",
	"location":       "locationid",
	"userid":         "userid",
	"id":             "userid",
	"newusername":    "new_username",
	"username_new":   "new_username",
	"usernameupdate": "new_username",
	"phone":          "phone",
	"phonenumber":    "phone",
	"roles":          "roles",
	"roleids":        "roles",
	"rolenames":      "roles",
	"status":         "status",
	"timezone":       "timezone",
	"details":        "details",
	"issales":        "issales",
	"sales":          "issales",
	"managerid":      "managerid",
	"manager":        "managerid",
	"mfarequired":    "mfarequired",
	"mfa":            "mfarequired",
	"servicelineids": "servicelineids",
}

func stringPtr(value string) *string {
	v := value
	return &v
}

func intPtr(value int) *int {
	v := value
	return &v
}