<?php

namespace SilverStripe\Forms\Tests\GridField;

use SilverStripe\Forms\Tests\GridField\GridFieldTest\Player;
use SilverStripe\Forms\Tests\GridField\GridFieldTest\Team;
use SilverStripe\ORM\ArrayList;
use SilverStripe\ORM\DataList;
use SilverStripe\Dev\CSSContentParser;
use SilverStripe\Dev\FunctionalTest;
use SilverStripe\Control\Controller;
use SilverStripe\Forms\FieldList;
use SilverStripe\Forms\Form;
use SilverStripe\Forms\GridField\GridFieldConfig;
use SilverStripe\Forms\GridField\GridFieldToolbarHeader;
use SilverStripe\Forms\GridField\GridFieldPaginator;
use SilverStripe\Forms\GridField\GridFieldPageCount;
use SilverStripe\Forms\GridField\GridField;

class GridFieldPaginatorTest extends FunctionalTest {
	/** @var ArrayList */
	protected $list;

	/** @var GridField */
	protected $gridField;

	/** @var string */
	protected static $fixture_file = 'GridFieldTest.yml';

	/** @var Form */
	protected $form;

	/** @var array */
	protected $extraDataObjects = array(
		Team::class,
		Player::class
	);

	public function setUp() {
		parent::setUp();
		$this->list = new DataList(Team::class);
		$config = GridFieldConfig::create()->addComponents(
			new GridFieldToolbarHeader(), // Required to support pagecount
			new GridFieldPaginator(2),
			new GridFieldPageCount('toolbar-header-right')
		);
		$this->gridField = new GridField('testfield', 'testfield', $this->list, $config);
		$this->form = new Form(new Controller(), 'mockform', new FieldList(array($this->gridField)), new FieldList());
	}

	public function testThereIsPaginatorWhenMoreThanOnePage() {
		$fieldHolder = $this->gridField->FieldHolder();
		$content = new CSSContentParser($fieldHolder);
		// Check that there is paginator render into the footer
		$this->assertEquals(1, count($content->getBySelector('.datagrid-pagination')));

		// Check that the header and footer both contains a page count
		$this->assertEquals(2, count($content->getBySelector('.pagination-records-number')));
	}

	public function testThereIsNoPaginatorWhenOnlyOnePage() {
		// We set the itemsPerPage to an reasonably big number so as to avoid test broke from small changes
		// on the fixture YML file
		$total = $this->list->count();
		$this->gridField->getConfig()->getComponentByType(GridFieldPaginator::class)->setItemsPerPage($total);
		$fieldHolder = $this->gridField->FieldHolder();
		$content = new CSSContentParser($fieldHolder);

		// Check that there is no paginator render into the footer
		$this->assertEquals(0, count($content->getBySelector('.datagrid-pagination')));

		// Check that there is still 'View 1 - 4 of 4' part on the left of the paginator
		$this->assertEquals(2, count($content->getBySelector('.pagination-records-number')));
	}

	public function testPaginationAvoidsIllegalOffsets() {
		$grid = $this->gridField;
		$total = $this->list->count();
		$perPage = $grid->getConfig()->getComponentByType(GridFieldPaginator::class)->getItemsPerPage();
		// Get the last page that will contain results
		$lastPage = ceil($total / $perPage);
		// Set the paginator state to point to an 'invalid' page
		$grid->State->GridFieldPaginator->currentPage = $lastPage + 1;

		// Get the paginated list
		$list = $grid->getManipulatedList();

		// Assert that the paginator state has been corrected and the list contains items
		$this->assertEquals(1, $grid->State->GridFieldPaginator->currentPage);
		$this->assertEquals($perPage, $list->count());
	}

}