package pagination

type Pagination interface {
	OffsetLimit() *offsetLimit
	Page() *page
}

type page struct {
	Now  uint32
	Size uint32
}

type offsetLimit struct {
	Offset uint32
	Limit  uint32
}

type custom struct {
	Now  uint32
	Size uint32
}

func (p *custom) OffsetLimit() *offsetLimit {
	pageNow := p.Now
	if pageNow > 1 {
		pageNow = pageNow - 1
	} else {
		pageNow = 0
	}
	return &offsetLimit{
		Offset: pageNow * p.Size,
		Limit:  p.Size,
	}
}

func (p *custom) Page() *page {
	return &page{
		Now:  p.Now,
		Size: p.Size,
	}
}

func New(now, size uint32) Pagination {
	return &custom{
		Now:  now,
		Size: size,
	}
}