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package meta
import (
"strconv"
"github.com/gofiber/fiber/v2"
"gorm.io/gorm"
)
type Pagination struct {
Page int
PerPage int
}
type PaginatedResponse struct {
Items any `json:"items"`
Total int64 `json:"total"`
Page int `json:"page"`
PerPage int `json:"per_page"`
TotalPages int `json:"total_pages"`
}
func Paginate(context *fiber.Ctx) Pagination {
requestData := Request(context)
page := DefaultPage
perPage := DefaultPerPage
if pageValue := requestData.Query("page"); pageValue != "" {
parsed, _ := strconv.Atoi(pageValue)
if parsed >= DefaultPage {
page = parsed
}
}
if perPageValue := requestData.Query("per_page"); perPageValue != "" {
parsed, _ := strconv.Atoi(perPageValue)
if parsed >= DefaultPage && parsed <= MaxPerPage {
perPage = parsed
}
}
return Pagination{Page: page, PerPage: perPage}
}
func (self Pagination) Apply(query *gorm.DB) *gorm.DB {
return query.Offset((self.Page - 1) * self.PerPage).Limit(self.PerPage)
}
func (self Pagination) Response(items any, total int64) PaginatedResponse {
totalPages := int(total) / self.PerPage
if int(total)%self.PerPage > 0 {
totalPages++
}
return PaginatedResponse{
Items: items,
Total: total,
Page: self.Page,
PerPage: self.PerPage,
TotalPages: totalPages,
}
}
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