1func NewPager(source Pageable, defaultPageSize int, reversed bool) *Pager

1type Item struct {
2	Index interface{}
3	Value interface{}
4}

 1type Page struct {
 2	Items      []Item
 3	PageNumber int
 4	PageSize   int
 5	TotalItems int
 6	TotalPages int
 7	HasPrev    bool
 8	HasNext    bool
 9	Pager      *Pager
10}

 1type Pageable interface {
 2	// Size returns the total number of items
 3	Size() int
 4
 5	// IterateByOffset performs iteration starting from offset for count elements.
 6	// The callback receives an index and a value, returns true to stop iteration.
 7	//
 8	// For reverse iteration, the implementation should handle the direction internally
 9	// by adjusting how it interprets the offset and count parameters. For example:
10	// - In forward mode: offset 0, count 5 would return items [0,1,2,3,4]
11	// - In reverse mode: offset 0, count -5 would return items [4,3,2,1,0]
12	//
13	// This approach allows the interface to remain simple while supporting
14	// bidirectional iteration through the implementation layer.
15	IterateByOffset(offset int, count int, cb func(index interface{}, value interface{}) bool) bool
16}

1type Pager struct {
2	Source          Pageable
3	PageQueryParam  string
4	SizeQueryParam  string
5	DefaultPageSize int
6	Reversed        bool
7}