<?php

/**
 * Test: Nette\Utils\Paginator Base:0 Page:3 test.
 */

declare(strict_types=1);

use Nette\Utils\Paginator;
use Tester\Assert;


require __DIR__ . '/../bootstrap.php';


test('adjusts page when exceeding total count for zero-based indexing', function () {
	$paginator = new Paginator;
	$paginator->itemCount = 7;
	$paginator->itemsPerPage = 6;
	$paginator->base = 0;
	$paginator->page = 3;

	Assert::same(1, $paginator->page);
	Assert::same(2, $paginator->pageCount);
	Assert::same(0, $paginator->firstPage);
	Assert::same(1, $paginator->lastPage);
	Assert::same(7, $paginator->firstItemOnPage);
	Assert::same(7, $paginator->lastItemOnPage);
	Assert::same(6, $paginator->offset);
	Assert::same(0, $paginator->countdownOffset);
	Assert::same(1, $paginator->length);
});


test('normalizes negative page value to first page', function () {
	$paginator = new Paginator;
	$paginator->itemCount = 7;
	$paginator->itemsPerPage = 6;
	$paginator->base = 0;
	$paginator->page = -1;

	Assert::same(0, $paginator->page);
	Assert::same(1, $paginator->firstItemOnPage);
	Assert::same(6, $paginator->lastItemOnPage);
	Assert::same(0, $paginator->offset);
	Assert::same(1, $paginator->countdownOffset);
	Assert::same(6, $paginator->length);
});


test('handles single-page pagination with exact fit', function () {
	$paginator = new Paginator;
	$paginator->itemCount = 7;
	$paginator->itemsPerPage = 7;
	$paginator->base = 0;
	$paginator->page = -1;

	Assert::same(0, $paginator->page);
	Assert::same(1, $paginator->pageCount);
	Assert::same(0, $paginator->firstPage);
	Assert::same(0, $paginator->lastPage);
	Assert::same(1, $paginator->firstItemOnPage);
	Assert::same(7, $paginator->lastItemOnPage);
	Assert::same(0, $paginator->offset);
	Assert::same(0, $paginator->countdownOffset);
	Assert::same(7, $paginator->length);
});


test('treats negative item count as empty result', function () {
	$paginator = new Paginator;
	$paginator->itemCount = -1;
	$paginator->itemsPerPage = 7;
	$paginator->base = 0;
	$paginator->page = -1;

	Assert::same(0, $paginator->page);
	Assert::same(0, $paginator->pageCount);
	Assert::same(0, $paginator->firstPage);
	Assert::same(0, $paginator->lastPage);
	Assert::same(0, $paginator->firstItemOnPage);
	Assert::same(0, $paginator->lastItemOnPage);
	Assert::same(0, $paginator->offset);
	Assert::same(0, $paginator->countdownOffset);
	Assert::same(0, $paginator->length);
});


test('adapts pagination for one-based indexing', function () {
	$paginator = new Paginator;
	$paginator->itemCount = 7;
	$paginator->itemsPerPage = 6;
	$paginator->base = 1;
	$paginator->page = 3;

	Assert::same(2, $paginator->page);
	Assert::same(2, $paginator->pageCount);
	Assert::same(1, $paginator->firstPage);
	Assert::same(2, $paginator->lastPage);
	Assert::same(7, $paginator->firstItemOnPage);
	Assert::same(7, $paginator->lastItemOnPage);
	Assert::same(6, $paginator->offset);
	Assert::same(0, $paginator->countdownOffset);
	Assert::same(1, $paginator->length);
});


test('determines first/last page status and item boundaries', function () {
	$paginator = new Paginator;

	// ItemCount: 0
	$paginator->setItemCount(0);
	Assert::true($paginator->isFirst());
	Assert::true($paginator->isLast());
	Assert::same(0, $paginator->firstItemOnPage);
	Assert::same(0, $paginator->lastItemOnPage);


	// ItemCount: 1
	$paginator->setItemCount(1);
	Assert::true($paginator->isFirst());
	Assert::true($paginator->isLast());
	Assert::same(1, $paginator->firstItemOnPage);
	Assert::same(1, $paginator->lastItemOnPage);


	// ItemCount: 2
	$paginator->setItemCount(2);
	Assert::true($paginator->isFirst());
	Assert::false($paginator->isLast());
	Assert::same(1, $paginator->firstItemOnPage);
	Assert::same(1, $paginator->lastItemOnPage);

	// Page 2
	$paginator->setPage(2);
	Assert::false($paginator->isFirst());
	Assert::true($paginator->isLast());
	Assert::same(2, $paginator->firstItemOnPage);
	Assert::same(2, $paginator->lastItemOnPage);
});


test('manages pagination when total item count is undefined', function () {
	$paginator = new Paginator;
	$paginator->itemsPerPage = 6;
	$paginator->base = 0;
	$paginator->page = 3;

	Assert::same(3, $paginator->page);
	Assert::null($paginator->pageCount);
	Assert::same(0, $paginator->firstPage);
	Assert::null($paginator->lastPage);
	Assert::same(19, $paginator->firstItemOnPage);
	Assert::same(24, $paginator->lastItemOnPage);
	Assert::same(18, $paginator->offset);
	Assert::null($paginator->countdownOffset);
	Assert::same(6, $paginator->length);
});