<?php

use Wikimedia\Rdbms\LBFactory;

/**
 * @covers ExternalStoreAccess
 */
class ExternalStoreAccessTest extends MediaWikiTestCase {

	use MediaWikiCoversValidator;

	/**
	 * @covers ExternalStoreAccess::isReadOnly
	 */
	public function testBasic() {
		$active = [ 'memory' ];
		$defaults = [ 'memory://cluster1', 'memory://cluster2' ];
		$esFactory = new ExternalStoreFactory( $active, $defaults, 'db-prefix' );
		$access = new ExternalStoreAccess( $esFactory );

		$this->assertEquals( false, $access->isReadOnly() );

		/** @var ExternalStoreMemory $store */
		$store = $esFactory->getStore( 'memory' );
		$this->assertInstanceOf( ExternalStoreMemory::class, $store );

		$lb = $this->getMockBuilder( LoadBalancer::class )
			->disableOriginalConstructor()->getMock();
		$lb->expects( $this->any() )->method( 'getReadOnlyReason' )->willReturn( 'Locked' );
		$lb->expects( $this->any() )->method( 'getServerInfo' )->willReturn( [] );

		$lbFactory = $this->getMockBuilder( LBFactory::class )
			->disableOriginalConstructor()->getMock();
		$lbFactory->expects( $this->any() )->method( 'getExternalLB' )->willReturn( $lb );

		$this->setService( 'DBLoadBalancerFactory', $lbFactory );

		$active = [ 'db', 'mwstore' ];
		$defaults = [ 'DB://clusterX' ];
		$esFactory = new ExternalStoreFactory( $active, $defaults, 'db-prefix' );
		$access = new ExternalStoreAccess( $esFactory );
		$this->assertEquals( true, $access->isReadOnly() );

		$store->clear();
	}

	/**
	 * @covers ExternalStoreAccess::fetchFromURL
	 * @covers ExternalStoreAccess::fetchFromURLs
	 * @covers ExternalStoreAccess::insert
	 */
	public function testReadWrite() {
		$active = [ 'memory' ]; // active store types
		$defaults = [ 'memory://cluster1', 'memory://cluster2' ];
		$esFactory = new ExternalStoreFactory( $active, $defaults, 'db-prefix' );
		$access = new ExternalStoreAccess( $esFactory );

		/** @var ExternalStoreMemory $storeLocal */
		$storeLocal = $esFactory->getStore( 'memory' );
		/** @var ExternalStoreMemory $storeOther */
		$storeOther = $esFactory->getStore( 'memory', [ 'domain' => 'other' ] );
		$this->assertInstanceOf( ExternalStoreMemory::class, $storeLocal );
		$this->assertInstanceOf( ExternalStoreMemory::class, $storeOther );

		$v1 = wfRandomString();
		$v2 = wfRandomString();
		$v3 = wfRandomString();

		$this->assertEquals( false, $storeLocal->fetchFromURL( 'memory://cluster1/1' ) );

		$url1 = 'memory://cluster1/1';
		$this->assertEquals(
			$url1,
			$esFactory->getStoreForUrl( 'memory://cluster1' )
				->store( $esFactory->getStoreLocationFromUrl( 'memory://cluster1' ), $v1 )
		);
		$this->assertEquals(
			$v1,
			$esFactory->getStoreForUrl( 'memory://cluster1/1' )
				->fetchFromURL( 'memory://cluster1/1' )
		);
		$this->assertEquals( $v1, $storeLocal->fetchFromURL( 'memory://cluster1/1' ) );

		$url2 = $access->insert( $v2 );
		$url3 = $access->insert( $v3, [ 'domain' => 'other' ] );
		$this->assertNotFalse( $url2 );
		$this->assertNotFalse( $url3 );
		// There is only one active store type
		$this->assertEquals( $v2, $storeLocal->fetchFromURL( $url2 ) );
		$this->assertEquals( $v3, $storeOther->fetchFromURL( $url3 ) );
		$this->assertEquals( false, $storeOther->fetchFromURL( $url2 ) );
		$this->assertEquals( false, $storeLocal->fetchFromURL( $url3 ) );

		$res = $access->fetchFromURLs( [ $url1, $url2, $url3 ] );
		$this->assertEquals( [ $url1 => $v1, $url2 => $v2, $url3 => false ], $res, "Local-only" );

		$storeLocal->clear();
		$storeOther->clear();
	}
}