prompt 7

internal/services/users_service.go

@@ -0,0 +1,132 @@
+package services
+
+import (
+	"strings"
+
+	"trustcontact/internal/models"
+	"trustcontact/internal/repo"
+
+	"gorm.io/gorm"
+)
+
+type UsersService struct {
+	users *repo.UserRepo
+}
+
+type UsersQuery struct {
+	Q        string
+	Sort     string
+	Dir      string
+	Page     int
+	PageSize int
+}
+
+type UsersPage struct {
+	Users      []models.User
+	Total      int64
+	Page       int
+	PageSize   int
+	TotalPages int
+	HasPrev    bool
+	HasNext    bool
+	PrevPage   int
+	NextPage   int
+	Sort       string
+	Dir        string
+	Q          string
+}
+
+func NewUsersService(database *gorm.DB) *UsersService {
+	return &UsersService{users: repo.NewUserRepo(database)}
+}
+
+func (s *UsersService) List(query UsersQuery) (*UsersPage, error) {
+	page := query.Page
+	if page < 1 {
+		page = 1
+	}
+	pageSize := query.PageSize
+	if pageSize <= 0 {
+		pageSize = 10
+	}
+	if pageSize > 100 {
+		pageSize = 100
+	}
+
+	sort := normalizeSort(query.Sort)
+	dir := normalizeDir(query.Dir)
+
+	users, total, err := s.users.List(repo.UserListParams{
+		Query:    strings.TrimSpace(query.Q),
+		Sort:     sort,
+		Dir:      dir,
+		Page:     page,
+		PageSize: pageSize,
+	})
+	if err != nil {
+		return nil, err
+	}
+
+	totalPages := 0
+	if total > 0 {
+		totalPages = int((total + int64(pageSize) - 1) / int64(pageSize))
+	}
+	if totalPages > 0 && page > totalPages {
+		page = totalPages
+		users, total, err = s.users.List(repo.UserListParams{
+			Query:    strings.TrimSpace(query.Q),
+			Sort:     sort,
+			Dir:      dir,
+			Page:     page,
+			PageSize: pageSize,
+		})
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	hasPrev := page > 1
+	hasNext := totalPages > 0 && page < totalPages
+
+	return &UsersPage{
+		Users:      users,
+		Total:      total,
+		Page:       page,
+		PageSize:   pageSize,
+		TotalPages: totalPages,
+		HasPrev:    hasPrev,
+		HasNext:    hasNext,
+		PrevPage:   max(1, page-1),
+		NextPage:   page + 1,
+		Sort:       sort,
+		Dir:        dir,
+		Q:          strings.TrimSpace(query.Q),
+	}, nil
+}
+
+func (s *UsersService) GetByID(id uint) (*models.User, error) {
+	return s.users.FindByID(id)
+}
+
+func normalizeSort(sort string) string {
+	switch strings.ToLower(strings.TrimSpace(sort)) {
+	case "id", "name", "email":
+		return strings.ToLower(strings.TrimSpace(sort))
+	default:
+		return "id"
+	}
+}
+
+func normalizeDir(dir string) string {
+	if strings.ToLower(strings.TrimSpace(dir)) == "desc" {
+		return "desc"
+	}
+	return "asc"
+}
+
+func max(a, b int) int {
+	if a > b {
+		return a
+	}
+	return b
+}