Move pagination to helper function and implement filters+search in contacts

helpers/pagination.go

@@ -0,0 +1,68 @@
+package helpers
+
+type Pagination struct {
+	PageSize    int
+	MaxPages    int
+	CurrentPage int
+	Offset      int
+	Count       int
+	Pages       []int
+}
+
+func Paginate(size int, count int, page int) Pagination {
+	if size < 1 {
+		size = 1
+	}
+
+	if page < 1 {
+		page = 1
+	}
+
+	pagination := Pagination{
+		PageSize:    size,
+		CurrentPage: page,
+		Count:       count,
+		MaxPages:    1,
+	}
+
+	if pagination.Count > pagination.PageSize {
+		pagination.MaxPages = pagination.Count / pagination.PageSize
+	}
+
+	if pagination.CurrentPage > pagination.MaxPages {
+		pagination.CurrentPage = 1
+	}
+
+	pagination.Offset = (pagination.CurrentPage - 1) / pagination.PageSize
+
+	for i := 1; i <= pagination.MaxPages; i++ {
+
+		if i == pagination.CurrentPage {
+			pagination.Pages = append(pagination.Pages, i)
+			continue
+		}
+
+		if i >= (pagination.CurrentPage-2) && i < pagination.CurrentPage {
+			pagination.Pages = append(pagination.Pages, i)
+			continue
+		}
+
+		if i <= (pagination.CurrentPage+2) && i > pagination.CurrentPage {
+			pagination.Pages = append(pagination.Pages, i)
+			continue
+		}
+
+		if pagination.CurrentPage <= 2 && i <= 5 {
+			pagination.Pages = append(pagination.Pages, i)
+			continue
+		}
+
+		if pagination.CurrentPage >= (pagination.MaxPages-2) && i >= (pagination.MaxPages-5) {
+			pagination.Pages = append(pagination.Pages, i)
+			continue
+		}
+
+	}
+
+	return pagination
+}