package page

import (
	"strconv"

	"github.com/gin-gonic/gin"
)

type PageData struct {
	PageSize   int         `json:"page_size"`
	PageNumber int         `json:"page_number"`
	Offset     int         `json:"-"`
	Total      interface{} `json:"total"`
	Data       interface{} `json:"data"`
}

func Build(ctx *gin.Context, pageSize int) PageData {
	s := ctx.Query("p")
	i, err := strconv.Atoi(s)
	if err != nil {
		i = 1
	}

	return PageData{
		PageNumber: i,
		PageSize:   pageSize,
		Offset:     (i - 1) * pageSize,
	}
}