<?php

namespace SilverStripe\CMS\Tests\Model;

use SilverStripe\CMS\Model\SiteTree;
use SilverStripe\Control\Director;
use SilverStripe\Control\HTTP;
use SilverStripe\Dev\SapphireTest;
use SilverStripe\Forms\GridField\GridField;
use SilverStripe\Versioned\Versioned;

/**
 * Tests {@see SiteTreeLinkTracking} broken links feature: LinkTracking
 */
class SiteTreeBacklinksTest extends SapphireTest
{
    protected static $fixture_file = "SiteTreeBacklinksTest.yml";

    protected static $required_extensions = [
        SiteTree::class => [
            SiteTreeBacklinksTest_DOD::class
        ],
    ];

    protected static $extra_dataobjects = [
        SiteTreeBacklinksTestContentObject::class,
    ];

    public function setUp()
    {
        parent::setUp();

        // Log in as admin so that we don't run into permission issues.  That's not what we're
        // testing here.
        $this->logInWithPermission('ADMIN');

        $page3 = $this->objFromFixture('Page', 'page3');
        $page3->Content = str_replace(
            '$page1.ID',
            $this->objFromFixture('Page', 'page1')->ID,
            $page3->Content
        );
        $page3->write();
    }

    public function testSavingPageWithLinkAddsBacklink()
    {
        // load page 1
        $page1 = $this->objFromFixture('Page', 'page1');

        // assert backlink to page 2 doesn't exist
        $page2 = $this->objFromFixture('Page', 'page2');
        $this->assertNotContains($page2->ID, $page1->BackLinkTracking()->column('ID'), 'Assert backlink to page 2 doesn\'t exist');

        // add hyperlink to page 1 on page 2
        $page2->Content .= '<p><a href="[sitetree_link,id='.$page1->ID.']">Testing page 1 link</a></p>';
        $page2->write();

        // load page 1
        $page1 = $this->objFromFixture('Page', 'page1');

        // assert backlink to page 2 exists
        $this->assertContains($page2->ID, $page1->BackLinkTracking()->column('ID'), 'Assert backlink to page 2 exists');
    }

    public function testRemovingLinkFromPageRemovesBacklink()
    {
        // load page 1
        $page1 = $this->objFromFixture('Page', 'page1');

        // assert backlink to page 3 exits
        $page3 = $this->objFromFixture('Page', 'page3');
        $this->assertContains($page3->ID, $page1->BackLinkTracking()->column('ID'), 'Assert backlink to page 3 exists');

        // remove hyperlink to page 1
        $page3->Content = '<p>No links anymore!</p>';
        $page3->write();

        // load page 1
        $page1 = $this->objFromFixture('Page', 'page1');

        // assert backlink to page 3 exists
        $this->assertNotContains($page3->ID, $page1->BackLinkTracking()->column('ID'), 'Assert backlink to page 3 doesn\'t exist');
    }

    public function testChangingUrlOnDraftSiteRewritesLink()
    {
        // load page 1
        $page1 = $this->objFromFixture('Page', 'page1');

        // assert backlink to page 3 exists
        $page3 = $this->objFromFixture('Page', 'page3');
        $this->assertContains($page3->ID, $page1->BackLinkTracking()->column('ID'), 'Assert backlink to page 3 exists');

        // assert hyperlink to page 1's current url exists on page 3
        $links = HTTP::getLinksIn($page3->obj('Content')->forTemplate());
        $this->assertContains(Director::baseURL().'page1/', $links, 'Assert hyperlink to page 1\'s current url exists on page 3');

        // change url of page 1
        $page1->URLSegment = 'new-url-segment';
        $page1->write();

        // load page 3
        $page3 = $this->objFromFixture('Page', 'page3');

        // assert hyperlink to page 1's new url exists
        $links = HTTP::getLinksIn($page3->obj('Content')->forTemplate());
        $this->assertContains(Director::baseURL().'new-url-segment/', $links, 'Assert hyperlink to page 1\'s new url exists on page 3');
    }

    public function testChangingUrlOnLiveSiteRewritesLink()
    {
        // publish page 1 & 3
        $page1 = $this->objFromFixture('Page', 'page1');
        $page3 = $this->objFromFixture('Page', 'page3');
        $this->assertTrue($page1->publishRecursive());
        $this->assertTrue($page3->publishRecursive());

        // load pages from live
        $page1live = Versioned::get_one_by_stage('Page', 'Live', '"SiteTree"."ID" = ' . $page1->ID);
        $page3live = Versioned::get_one_by_stage('Page', 'Live', '"SiteTree"."ID" = ' . $page3->ID);

        // assert backlink to page 3 exists
        $this->assertContains($page3live->ID, $page1live->BackLinkTracking()->column('ID'), 'Assert backlink to page 3 exists');

        // assert hyperlink to page 1's current url exists on page 3
        $links = HTTP::getLinksIn($page3live->obj('Content')->forTemplate());
        $this->assertContains(Director::baseURL().'page1/', $links, 'Assert hyperlink to page 1\'s current url exists on page 3');

        // change url of page 1
        $page1live->URLSegment = 'new-url-segment';
        $page1live->writeToStage('Live');

        // load page 3 from live
        $page3live = Versioned::get_one_by_stage('Page', 'Live', '"SiteTree"."ID" = ' . $page3->ID);

        // assert hyperlink to page 1's new url exists
        Versioned::set_stage(Versioned::LIVE);
        $links = HTTP::getLinksIn($page3live->obj('Content')->forTemplate());
        $this->assertContains(Director::baseURL().'new-url-segment/', $links, 'Assert hyperlink to page 1\'s new url exists on page 3');
    }

    public function testPublishingPageWithModifiedUrlRewritesLink()
    {
        // publish page 1 & 3
        $page1 = $this->objFromFixture('Page', 'page1');
        $page3 = $this->objFromFixture('Page', 'page3');

        $this->assertTrue($page1->publishRecursive());
        $this->assertTrue($page3->publishRecursive());

        // load page 3 from live
        $page3live = Versioned::get_one_by_stage('Page', 'Live', '"SiteTree"."ID" = ' . $page3->ID);

        // assert hyperlink to page 1's current url exists
        $links = HTTP::getLinksIn($page3live->obj('Content')->forTemplate());
        $this->assertContains(Director::baseURL().'page1/', $links, 'Assert hyperlink to page 1\'s current url exists on page 3');

        // rename url of page 1 on stage
        $page1->URLSegment = 'new-url-segment';
        $page1->write();

        // assert hyperlink to page 1's current publish url exists
        $page3live = Versioned::get_one_by_stage('Page', 'Live', '"SiteTree"."ID" = ' . $page3->ID);
        Versioned::set_stage(Versioned::LIVE);
        $links = HTTP::getLinksIn($page3live->obj('Content')->forTemplate());
        $this->assertContains(Director::baseURL().'page1/', $links, 'Assert hyperlink to page 1\'s current published url exists on page 3');


        // publish page 1
        $this->assertTrue($page1->publishRecursive());

        // assert hyperlink to page 1's new published url exists
        $page3live = Versioned::get_one_by_stage('Page', 'Live', '"SiteTree"."ID" = ' . $page3->ID);
        $links = HTTP::getLinksIn($page3live->obj('Content')->forTemplate());
        $this->assertContains(Director::baseURL().'new-url-segment/', $links, 'Assert hyperlink to page 1\'s new published url exists on page 3');
    }

    public function testPublishingPageWithModifiedLinksRewritesLinks()
    {
        // publish page 1 & 3
        $page1 = $this->objFromFixture('Page', 'page1');
        $page3 = $this->objFromFixture('Page', 'page3');
        $this->assertTrue($page1->publishRecursive());
        $this->assertTrue($page3->publishRecursive());

        // assert hyperlink to page 1's current url exists
        $links = HTTP::getLinksIn($page3->obj('Content')->forTemplate());
        $this->assertContains(Director::baseURL().'page1/', $links, 'Assert hyperlink to page 1\'s current published url exists on page 3');

        // change page 1 url on draft
        $page1->URLSegment = 'new-url-segment';

        // save page 1
        $page1->write();

        // assert page 3 on draft contains new page 1 url
        $page3 = $this->objFromFixture('Page', 'page3');
        $links = HTTP::getLinksIn($page3->obj('Content')->forTemplate());
        $this->assertContains(Director::baseURL().'new-url-segment/', $links, 'Assert hyperlink to page 1\'s current draft url exists on page 3');

        // publish page 3
        $this->assertTrue($page3->publishRecursive());

        // assert page 3 on published site contains old page 1 url
        $page3live = Versioned::get_one_by_stage('Page', 'Live', '"SiteTree"."ID" = ' . $page3->ID);
        Versioned::set_stage(Versioned::LIVE);
        $links = HTTP::getLinksIn($page3live->obj('Content')->forTemplate());
        $this->assertContains(Director::baseURL().'page1/', $links, 'Assert hyperlink to page 1\'s current published url exists on page 3');

        // publish page 1
        $this->assertTrue($page1->publishRecursive());

        // assert page 3 on published site contains new page 1 url
        $page3live = Versioned::get_one_by_stage('Page', 'Live', '"SiteTree"."ID" = ' . $page3->ID);
        $links = HTTP::getLinksIn($page3live->obj('Content')->forTemplate());
        $this->assertContains(Director::baseURL().'new-url-segment/', $links, 'Assert hyperlink to page 1\'s current published url exists on page 3');
    }

    public function testLinkTrackingOnExtraContentFields()
    {
        /** @var Page $page1 */
        $page1 = $this->objFromFixture('Page', 'page1');
        /** @var Page $page2 */
        $page2 = $this->objFromFixture('Page', 'page2');
        $page1->publishRecursive();
        $page2->publishRecursive();

        // assert backlink to page 2 doesn't exist
        $this->assertNotContains($page2->ID, $page1->BackLinkTracking()->column('ID'), 'Assert backlink to page 2 doesn\'t exist');

        // add hyperlink to page 1 on page 2
        $page2->ExtraContent .= '<p><a href="[sitetree_link,id='.$page1->ID.']">Testing page 1 link</a></p>';
        $page2->write();
        $page2->publishRecursive();

        // assert backlink to page 2 exists
        $this->assertContains($page2->ID, $page1->BackLinkTracking()->column('ID'), 'Assert backlink to page 2 exists');

        // update page1 url
        $page1 = $this->objFromFixture('Page', 'page1');
        $page1->URLSegment = "page1-new-url";
        $page1->write();

        // confirm that draft link on page2 has been rewritten
        $page2 = $this->objFromFixture('Page', 'page2');
        $this->assertEquals('<p><a href="'.Director::baseURL().'page1-new-url/">Testing page 1 link</a></p>', $page2->obj('ExtraContent')->forTemplate());

        // confirm that published link hasn't
        $page2Live = Versioned::get_one_by_stage("Page", "Live", "\"SiteTree\".\"ID\" = $page2->ID");
        Versioned::set_stage(Versioned::LIVE);
        $this->assertEquals('<p><a href="'.Director::baseURL().'page1/">Testing page 1 link</a></p>', $page2Live->obj('ExtraContent')->forTemplate());

        // publish page1 and confirm that the link on the published page2 has now been updated
        $page1->publishRecursive();
        $page2Live = Versioned::get_one_by_stage("Page", "Live", "\"SiteTree\".\"ID\" = $page2->ID");
        $this->assertEquals('<p><a href="'.Director::baseURL().'page1-new-url/">Testing page 1 link</a></p>', $page2Live->obj('ExtraContent')->forTemplate());

        // Edit draft again
        Versioned::set_stage(Versioned::DRAFT);
        $page2->ExtraContent = '<p>No links anymore!</p>';
        $page2->write();

        // assert backlink to page 2 no longer exists
        $this->assertNotContains($page2->ID, $page1->BackLinkTracking()->column('ID'), 'Assert backlink to page 2 has been removed');
    }

    public function testLinkTrackingWithUntitledObjectsDisplaysAReadableIdentifier()
    {
        $page = $this->objFromFixture('Page', 'page2');

        $referencingObject = new SiteTreeBacklinksTestContentObject();
        $referencingObject->Content = '<p><a href="[sitetree_link,id='
            . $page->ID
            . ']">Page 2</a></p>';
        // Title purposely not set - this is the coverage case for this test
        $referencingObject->write();

        /** @var GridField $gridField */
        $gridField = $page->getCMSFields()->dataFieldByName('DependentPages');

        // Prepare and sanity check
        $this->assertNotNull($gridField);
        $list = $gridField->getList();
        $this->assertEquals(1, $list->count());

        $content = $gridField->getColumnContent($list->first(), 'Title');

        $this->assertContains('Untitled Backlink test content object', $content);
    }
}