<?php
declare(strict_types=1);

use PHPUnit\Framework\TestCase;

/**
 * TMDO_Shadow_Diff_Logger throttling (2.2 PR-075).
 *
 * The per-object window (one row per entity + key per 5 minutes) did not stop
 * a key that is stale on every object — WooCommerce's total_sales, written by
 * direct SQL — from logging a row for each product read. A key now records at
 * most KEY_LIMIT rows per KEY_WINDOW across all objects.
 */
class ShadowDiffThrottleTest extends TestCase {

	private const DIFFS  = 'wp_itest_wpdo_shadow_diffs';
	private const ERRORS = 'wp_itest_wpdo_errors';

	public static function setUpBeforeClass(): void {
		foreach ( array(
			'includes/adapters/interface-entity-adapter.php',
			'includes/adapters/class-tmdo-adapter-user.php',
			'includes/engine/class-tmdo-shadow-diff-logger.php',
		) as $file ) {
			require_once WPDO_PLUGIN_DIR . $file;
		}
	}

	protected function setUp(): void {
		global $wpdb;
		self::drop();
		$wpdb->query( "CREATE TABLE `{$wpdb->usermeta}` ( umeta_id BIGINT UNSIGNED NOT NULL AUTO_INCREMENT, user_id BIGINT UNSIGNED NOT NULL DEFAULT 0, meta_key VARCHAR(255) DEFAULT NULL, meta_value LONGTEXT, PRIMARY KEY (umeta_id), KEY user_id (user_id) ) ENGINE=InnoDB" );
		$wpdb->query( 'CREATE TABLE `' . self::DIFFS . "` ( id BIGINT UNSIGNED NOT NULL AUTO_INCREMENT, ts DATETIME NOT NULL DEFAULT '0000-00-00 00:00:00', entity_type VARCHAR(20) NOT NULL DEFAULT '', entity_id BIGINT UNSIGNED NOT NULL DEFAULT 0, meta_key VARCHAR(255) NOT NULL DEFAULT '', postmeta_value LONGTEXT, zone_value LONGTEXT, diff_hash VARCHAR(40) NOT NULL DEFAULT '', PRIMARY KEY (id) ) ENGINE=InnoDB" );
		$wpdb->query( 'CREATE TABLE `' . self::ERRORS . "` ( id BIGINT UNSIGNED NOT NULL AUTO_INCREMENT, module VARCHAR(100) NOT NULL DEFAULT '', zone VARCHAR(20) NOT NULL DEFAULT '', hook VARCHAR(255) NOT NULL DEFAULT '', message TEXT NOT NULL, context LONGTEXT, created_at DATETIME NOT NULL DEFAULT '0000-00-00 00:00:00', PRIMARY KEY (id) ) ENGINE=InnoDB" );
		for ( $id = 1; $id <= 30; $id++ ) {
			$wpdb->insert( $wpdb->usermeta, array( 'user_id' => $id, 'meta_key' => 'total_sales', 'meta_value' => '5' ) );
			$wpdb->insert( $wpdb->usermeta, array( 'user_id' => $id, 'meta_key' => 'other_key', 'meta_value' => '5' ) );
		}

		$GLOBALS['_wp_transients'] = array();
		WPDO_Entity_Registry::init();
		WPDO_Entity_Registry::register_adapter( 'user', new WPDO_Adapter_User() );
	}

	protected function tearDown(): void {
		self::drop();
		WPDO_Entity_Registry::init();
	}

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

	private function logged( string $key ): int {
		global $wpdb;
		return (int) $wpdb->get_var( $wpdb->prepare( 'SELECT COUNT(*) FROM `' . self::DIFFS . '` WHERE meta_key = %s', $key ) );
	}

	private function stale_read( int $user_id, string $key ): void {
		TMDO_Shadow_Diff_Logger::compare_and_log( 'user', $user_id, $key, 4, array( 'type' => 'integer' ) );
	}

	public function test_a_key_stale_on_every_object_logs_at_most_the_key_limit(): void {
		for ( $id = 1; $id <= 30; $id++ ) {
			$this->stale_read( $id, 'total_sales' );
		}

		$this->assertSame( TMDO_Shadow_Diff_Logger::KEY_LIMIT, $this->logged( 'total_sales' ) );
	}

	public function test_the_limit_is_per_key(): void {
		for ( $id = 1; $id <= 30; $id++ ) {
			$this->stale_read( $id, 'total_sales' );
		}
		$this->stale_read( 1, 'other_key' );

		$this->assertSame( 1, $this->logged( 'other_key' ) );
	}

	public function test_the_same_object_and_key_still_log_once_per_window(): void {
		$this->stale_read( 1, 'total_sales' );
		$this->stale_read( 1, 'total_sales' );

		$this->assertSame( 1, $this->logged( 'total_sales' ) );
	}
}