1 files changed, 84 insertions, 0 deletions
diff --git a/utils/meta/pagination.go b/utils/meta/pagination.go
new file mode 100644
index 0000000..9244294
--- /dev/null
+++ b/utils/meta/pagination.go
@@ -0,0 +1,84 @@
+package meta
+
+import (
+	"dove/types"
+	"strconv"
+
+	"github.com/gofiber/fiber/v2"
+	"gorm.io/gorm"
+)
+
+func Paginate(context *fiber.Ctx) Pagination {
+	requestData := Request(context)
+
+	page := DEFAULT_PAGE
+	perPage := DEFAULT_PER_PAGE
+
+	if requestData != nil {
+		if pageValue := requestData.Query("page"); pageValue != nil {
+			parsed, _ := strconv.Atoi(pageValue.String())
+			if parsed >= DEFAULT_PAGE {
+				page = parsed
+			}
+		}
+
+		if perPageValue := requestData.Query("per_page"); perPageValue != nil {
+			parsed, _ := strconv.Atoi(perPageValue.String())
+			if parsed >= DEFAULT_PAGE && parsed <= MAX_PER_PAGE {
+				perPage = parsed
+			}
+		}
+	}
+
+	return Pagination{Page: page, PerPage: perPage}
+}
+
+func Sort(context *fiber.Ctx, allowedFields []string, fallbackField string) Sorting {
+	requestData := Request(context)
+
+	field := fallbackField
+	direction := "desc"
+
+	if requestData != nil {
+		if sortValue := requestData.Query("sort"); sortValue != nil {
+			for _, allowedField := range allowedFields {
+				if sortValue.String() == allowedField {
+					field = sortValue.String()
+					break
+				}
+			}
+		}
+
+		if orderValue := requestData.Query("order"); orderValue != nil {
+			switch orderValue.String() {
+			case "asc", "desc":
+				direction = orderValue.String()
+			}
+		}
+	}
+
+	return Sorting{Field: field, Direction: direction}
+}
+
+func (self Pagination) Apply(query *gorm.DB) *gorm.DB {
+	return query.Offset((self.Page - 1) * self.PerPage).Limit(self.PerPage)
+}
+
+func (self Sorting) Apply(query *gorm.DB) *gorm.DB {
+	return query.Order(self.Field + " " + self.Direction)
+}
+
+func (self Pagination) Response(items any, total int64) types.PaginatedResponse {
+	totalPages := int(total) / self.PerPage
+	if int(total)%self.PerPage > 0 {
+		totalPages++
+	}
+
+	return types.PaginatedResponse{
+		Items:      items,
+		Total:      total,
+		Page:       self.Page,
+		PerPage:    self.PerPage,
+		TotalPages: totalPages,
+	}
+}