package synchronizator

import "fmt"

// StartPagination is the initial pagination configuration.
var StartPagination = Pagination{
	Total:   0,
	Pages:   0,
	HasMore: false,
	Limit:   10,
	Offset:  0,
}

type FetchResponse[T any] struct {
	Pagination
	Response T
}

// Pagination represents the pagination information for fetching data.
type Pagination struct {
	Total   uint64 // Total number of items.
	Pages   uint64
	HasMore bool   // Indicates if there are more items to fetch.
	Limit   uint64 // Number of items to fetch per request.
	Offset  uint64 // Offset for the next set of items to fetch.
}

func calculatePages(pagination *Pagination, offset uint64) (uint64, error) {
	if pagination.Limit == 0 {
		return 0, fmt.Errorf("division by zero")
	}

	dividend := pagination.Total - offset
	divisor := pagination.Limit

	result := dividend / divisor
	if dividend%divisor != 0 {
		result++
	}
	return result, nil
}

func getPageByOffset(pagination *Pagination) (uint64, error) {
	if pagination.Pages == 0 {
		return 0, fmt.Errorf("division by zero")
	}

	total := pagination.Pages * pagination.Limit

	result := (pagination.Pages * pagination.Offset) / total

	return result, nil
}