package data

import "gorm.io/gorm"

func paginationLimitOffset(page, size, maxSize int) (limit, offset int) {
	limit = size
	if maxSize > 0 && size > maxSize {
		limit = maxSize
	}
	if limit <= 0 {
		return 0, 0
	}
	if page <= 0 {
		page = 1
	}
	return limit, (page - 1) * limit
}

func applyPagination(db *gorm.DB, page, size, maxSize int) *gorm.DB {
	limit, offset := paginationLimitOffset(page, size, maxSize)
	if limit == 0 {
		return db
	}
	return db.Offset(offset).Limit(limit)
}

func applyRequiredPagination(db *gorm.DB, page, size, maxSize int) *gorm.DB {
	limit, offset := paginationLimitOffset(page, size, maxSize)
	return db.Offset(offset).Limit(limit)
}