<?php
declare(strict_types=1);

use PHPUnit\Framework\TestCase;

/**
 * Routed searches drop SQL_CALC_FOUND_ROWS; the total comes from a COUNT
 * cached until posts' last_changed moves (O-4).
 *
 * Three fr_item posts, prices 10 / 20 / 30.
 */
class PostQueryRouterFoundRowsTest extends TestCase {

	private const TABLE = 'wp_itest_wpdo_post_fr_core';

	public static function setUpBeforeClass(): void {
		$base = WPDO_PLUGIN_DIR;
		foreach ( array(
			'includes/adapters/interface-entity-adapter.php',
			'includes/engine/class-tmdo-type-caster.php',
			'includes/engine/class-tmdo-entity-registry.php',
			'includes/engine/class-tmdo-mode-manager.php',
			'includes/engine/class-tmdo-schema-manager.php',
			'includes/engine/class-tmdo-cache-orchestrator.php',
			'includes/adapters/class-tmdo-adapter-post.php',
			'includes/integrations/class-tmdo-post-fields.php',
			'includes/engine/class-tmdo-hook-bus.php',
			'includes/engine/class-tmdo-post-status-sync.php',
			'includes/query/class-tmdo-post-query-router.php',
		) as $file ) {
			require_once $base . $file;
		}
	}

	protected function setUp(): void {
		global $wpdb;
		self::drop();
		$wpdb->query( "CREATE TABLE `{$wpdb->posts}` ( ID BIGINT UNSIGNED NOT NULL, post_type VARCHAR(20) NOT NULL DEFAULT 'post', post_status VARCHAR(20) NOT NULL DEFAULT 'publish', post_date DATETIME NOT NULL DEFAULT '2000-01-01 00:00:00', PRIMARY KEY (ID) ) ENGINE=InnoDB" );
		$wpdb->query( 'CREATE TABLE `' . self::TABLE . '` ( id BIGINT NOT NULL AUTO_INCREMENT, post_id BIGINT NOT NULL, fr_price DECIMAL(18,6) DEFAULT NULL, PRIMARY KEY (id), UNIQUE KEY uk_entity (post_id) ) ENGINE=InnoDB' );
		$wpdb->query( "INSERT INTO `{$wpdb->posts}` (ID, post_type) VALUES (1, 'fr_item'), (2, 'fr_item'), (3, 'fr_item')" );
		$wpdb->query( 'INSERT INTO `' . self::TABLE . '` (post_id, fr_price) VALUES (1, 10), (2, 20), (3, 30)' );

		$GLOBALS['_wp_options']        = array();
		$GLOBALS['_wp_cache']          = array();
		$GLOBALS['_wp_last_changed']   = array();
		$GLOBALS['_wp_is_admin']       = false;
		$GLOBALS['_wp_current_filter'] = '';
		$GLOBALS['_wp_post_types']     = array( 1 => 'fr_item', 2 => 'fr_item', 3 => 'fr_item' );
		$ref                           = new ReflectionProperty( WPDO_Schema_Manager::class, 'table_exists_cache' );
		$ref->setAccessible( true );
		$ref->setValue( null, array() );
		$mode = new ReflectionProperty( WPDO_Mode_Manager::class, 'cache' );
		$mode->setAccessible( true );
		$mode->setValue( null, array( 'post' => 'aeav_only', 'user' => 'disabled', 'term' => 'disabled', 'comment' => 'disabled' ) );
		TMDO_Post_Query_Router::flush_copy_cache();

		WPDO_Entity_Registry::init();
		WPDO_Entity_Registry::register_adapter( 'post', new WPDO_Adapter_Post() );
		WPDO_Entity_Registry::register_group( 'post', 'fr_core', array( array( 'key' => 'fr_price', 'type' => 'decimal' ) ), array( 'post_types' => array( 'fr_item' ) ) );
	}

	protected function tearDown(): void {
		self::drop();
		WPDO_Entity_Registry::init();
		$mode = new ReflectionProperty( WPDO_Mode_Manager::class, 'cache' );
		$mode->setAccessible( true );
		$mode->setValue( null, null );
	}

	private static function drop(): void {
		global $wpdb;
		foreach ( array( $wpdb->posts, self::TABLE ) as $table ) {
			$wpdb->query( "DROP TABLE IF EXISTS `{$table}`" );
		}
	}

	/** A routed query plus the SQL WordPress would build for it (page size 1). */
	private function routed(): array {
		global $wpdb;
		$query = new WP_Query();
		$query->set( 'post_type', 'fr_item' );
		$query->set( 'post_status', 'publish' );
		$query->set( 'meta_query', array( array( 'key' => 'fr_price', 'value' => 15, 'compare' => '>=' ) ) );
		$router = new TMDO_Post_Query_Router();
		$router->pre_get_posts( $query );

		$request = "SELECT SQL_CALC_FOUND_ROWS {$wpdb->posts}.ID FROM {$wpdb->posts} " . $router->posts_join( '', $query )
			. " WHERE 1=1 AND {$wpdb->posts}.post_type = 'fr_item' AND (({$wpdb->posts}.post_status = 'publish'))" . $router->posts_where( '', $query )
			. " GROUP BY {$wpdb->posts}.ID ORDER BY {$wpdb->posts}.post_date DESC LIMIT 0, 1";
		return array( $router, $query, $request );
	}

	public function test_routed_request_drops_sql_calc_found_rows(): void {
		list( $router, $query, $request ) = $this->routed();

		$sql = $router->posts_request( $request, $query );

		$this->assertStringNotContainsString( 'SQL_CALC_FOUND_ROWS', $sql );
		$this->assertStringContainsString( 'LIMIT 0, 1', $sql );
	}

	public function test_unrouted_request_is_left_alone(): void {
		$router  = new TMDO_Post_Query_Router();
		$request = 'SELECT SQL_CALC_FOUND_ROWS wp_itest_posts.ID FROM wp_itest_posts WHERE 1=1 LIMIT 0, 10';

		$this->assertSame( $request, $router->posts_request( $request, new WP_Query() ) );
		$this->assertSame( 'SELECT FOUND_ROWS()', $router->found_posts_query( 'SELECT FOUND_ROWS()', new WP_Query() ) );
	}

	public function test_total_is_counted_once_and_served_from_cache_until_posts_change(): void {
		global $wpdb;
		list( $router, $query, $request ) = $this->routed();
		$router->posts_request( $request, $query );

		$this->assertSame( '2', $wpdb->get_var( $router->found_posts_query( 'SELECT FOUND_ROWS()', $query ) ) );

		$wpdb->query( 'UPDATE `' . self::TABLE . '` SET fr_price = 5 WHERE post_id = 2' );
		$this->assertSame( '2', $wpdb->get_var( $router->found_posts_query( 'SELECT FOUND_ROWS()', $query ) ), 'cached' );

		wp_cache_set_posts_last_changed();
		$this->assertSame( '1', $wpdb->get_var( $router->found_posts_query( 'SELECT FOUND_ROWS()', $query ) ), 'recounted' );
	}

	public function test_flat_writes_and_deletes_move_posts_last_changed(): void {
		$GLOBALS['_wp_current_filter'] = 'update_post_metadata';
		$before                        = wp_cache_get_last_changed( 'posts' );
		WPDO_Hook_Bus::intercept_update( null, 1, 'fr_price', '11', '' );
		$after_write = wp_cache_get_last_changed( 'posts' );

		$GLOBALS['_wp_current_filter'] = 'delete_post_metadata';
		WPDO_Hook_Bus::intercept_delete( null, 1, 'fr_price', '', false );

		$this->assertNotSame( $before, $after_write );
		$this->assertNotSame( $after_write, wp_cache_get_last_changed( 'posts' ) );
	}
}