<?php
declare(strict_types=1);

use PHPUnit\Framework\TestCase;

/**
 * Orphaned flat-table groups stay readable.
 *
 * Scenario: a plugin registered an entity group, its flat table was created
 * (definition persisted in wpdo_registry_meta), data landed there, and then
 * the plugin went away. In aeav_only mode the values exist only in the flat
 * table, so without the group registration reads come back empty.
 */
class OrphanGroupRestoreTest extends TestCase {

	private const GROUP = 'orphan_itest';
	private const TABLE = 'wp_itest_wpdo_user_orphan_itest';

	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-schema-manager.php',
			'includes/engine/class-tmdo-entity-registry.php',
			'includes/engine/class-tmdo-mode-manager.php',
			'includes/engine/class-tmdo-cache-orchestrator.php',
			'includes/adapters/class-tmdo-adapter-user.php',
			'includes/engine/class-tmdo-hook-bus.php',
		) as $file ) {
			require_once $base . $file;
		}
		WPDO_Installer::install_v2_tables();

		global $wpdb;
		$wpdb->query(
			"CREATE TABLE IF NOT EXISTS `{$wpdb->usermeta}` (
				umeta_id   BIGINT(20) UNSIGNED NOT NULL AUTO_INCREMENT,
				user_id    BIGINT(20) UNSIGNED NOT NULL DEFAULT 0,
				meta_key   VARCHAR(255) DEFAULT NULL,
				meta_value LONGTEXT,
				PRIMARY KEY (umeta_id),
				KEY meta_key (meta_key(191))
			) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4"
		);
	}

	protected function setUp(): void {
		global $wpdb;
		self::drop_fixture();
		$GLOBALS['_wp_options']    = array();
		$GLOBALS['_wp_cache']      = array();
		$GLOBALS['_wp_transients'] = array();
		self::reset_statics();

		// A provider registered the group earlier: its flat table exists and the
		// normalized definition was persisted to registry_meta (what
		// Schema_Manager::create_or_upgrade_table() leaves behind — built by hand
		// here because that method needs the real wp-admin upgrade.php).
		WPDO_Entity_Registry::init();
		WPDO_Entity_Registry::register_adapter( 'user', new WPDO_Adapter_User() );
		WPDO_Entity_Registry::register_group( 'user', self::GROUP, array( array( 'key' => 'orphan_note', 'type' => 'text' ) ) );
		$wpdb->query(
			'CREATE TABLE `' . self::TABLE . '` (
				`id` BIGINT(20) NOT NULL AUTO_INCREMENT,
				`user_id` BIGINT(20) NOT NULL,
				`orphan_note` VARCHAR(255) DEFAULT NULL,
				`created_at` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
				`updated_at` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
				PRIMARY KEY (`id`),
				UNIQUE KEY `uk_entity` (`user_id`)
			) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4'
		);
		$wpdb->insert(
			$wpdb->prefix . 'wpdo_registry_meta',
			array(
				'entity_type'       => 'user',
				'group_name'        => self::GROUP,
				'schema_hash'       => 'itest',
				'field_definitions' => wp_json_encode( WPDO_Entity_Registry::get_group_fields( 'user', self::GROUP ) ),
			)
		);
		$wpdb->insert( self::TABLE, array( 'user_id' => 77, 'orphan_note' => 'kept' ) );

		// The provider goes away: next request starts with an empty registry.
		WPDO_Entity_Registry::init();
		WPDO_Entity_Registry::register_adapter( 'user', new WPDO_Adapter_User() );
		self::reset_statics();
	}

	protected function tearDown(): void {
		self::drop_fixture();
		WPDO_Entity_Registry::init();
		self::set_modes( null );
	}

	public function test_orphaned_group_is_unreadable_before_restore(): void {
		self::set_modes( 'aeav_only' );

		$this->assertNull( WPDO_Hook_Bus::intercept_get( null, 77, 'orphan_note', true, 'user' ) );
	}

	public function test_restore_makes_aeav_only_data_readable_again(): void {
		self::set_modes( 'aeav_only' );

		$this->assertSame( 1, WPDO_Schema_Manager::restore_orphaned_groups() );

		$this->assertSame( array( 'kept' ), WPDO_Hook_Bus::intercept_get( null, 77, 'orphan_note', true, 'user' ) );
		$this->assertSame( array(), WPDO_Entity_Registry::get_pending_schemas(), 'Restoring must not queue DDL.' );
	}

	public function test_restore_only_applies_to_aeav_only(): void {
		// dual_write / shadow_read still write native meta, so an orphaned key
		// keeps reading correctly from there — nothing to restore.
		foreach ( array( 'disabled', 'dual_write', 'shadow_read' ) as $mode ) {
			self::set_modes( $mode );
			$this->assertSame( 0, WPDO_Schema_Manager::restore_orphaned_groups(), $mode );
			$this->assertNull( WPDO_Entity_Registry::get_field( 'user', 'orphan_note' ), $mode );
		}
	}

	public function test_key_with_native_meta_rows_stays_on_native(): void {
		global $wpdb;
		self::set_modes( 'aeav_only' );
		// Written to native meta while the group was unregistered — newer than the flat copy.
		$wpdb->insert( $wpdb->usermeta, array( 'user_id' => 5, 'meta_key' => 'orphan_note', 'meta_value' => 'native' ) );

		$this->assertSame( 0, WPDO_Schema_Manager::restore_orphaned_groups() );

		$this->assertNull( WPDO_Hook_Bus::intercept_get( null, 5, 'orphan_note', true, 'user' ), 'Native meta must keep serving this key.' );
		$this->assertSame( array( 'orphan_note' ), WPDO_Entity_Registry::get_restored_groups()[0]['native'] );
	}

	public function test_native_meta_check_is_cached(): void {
		self::set_modes( 'aeav_only' );
		WPDO_Schema_Manager::restore_orphaned_groups();

		$this->assertSame( array( 'user:orphan_note' => false ), get_transient( 'tmdo_orphan_native_keys' ) );
	}

	public function test_restore_skips_groups_whose_table_is_gone(): void {
		global $wpdb;
		self::set_modes( 'aeav_only' );
		$wpdb->query( 'DROP TABLE IF EXISTS `' . self::TABLE . '`' );
		self::reset_statics();

		$this->assertSame( 0, WPDO_Schema_Manager::restore_orphaned_groups() );
	}

	public function test_registered_group_is_left_alone(): void {
		self::set_modes( 'aeav_only' );
		WPDO_Entity_Registry::register_group( 'user', self::GROUP, array( array( 'key' => 'orphan_note', 'type' => 'text' ) ) );

		$this->assertSame( 0, WPDO_Schema_Manager::restore_orphaned_groups() );
		$this->assertSame( array(), WPDO_Entity_Registry::get_restored_groups() );
	}

	// ── Helpers ──────────────────────────────────────────────────────────────

	private static function drop_fixture(): void {
		global $wpdb;
		$wpdb->query( 'DROP TABLE IF EXISTS `' . self::TABLE . '`' );
		$wpdb->delete( $wpdb->prefix . 'wpdo_registry_meta', array( 'entity_type' => 'user', 'group_name' => self::GROUP ) );
		$wpdb->delete( $wpdb->usermeta, array( 'meta_key' => 'orphan_note' ) );
	}

	/** Clear Schema_Manager's table_exists cache and the Cache_Orchestrator L1. */
	private static function reset_statics(): void {
		$ref = new ReflectionProperty( WPDO_Schema_Manager::class, 'table_exists_cache' );
		$ref->setAccessible( true );
		$ref->setValue( null, array() );

		$l1 = new ReflectionProperty( WPDO_Cache_Orchestrator::class, 'l1_cache' );
		$l1->setAccessible( true );
		$l1->setValue( null, array() );
	}

	/** Inject the user mode straight into Mode_Manager's cache (null = reset). */
	private static function set_modes( ?string $user_mode ): void {
		$ref = new ReflectionProperty( WPDO_Mode_Manager::class, 'cache' );
		$ref->setAccessible( true );
		$ref->setValue(
			null,
			null === $user_mode ? null : array(
				'user'    => $user_mode,
				'post'    => 'disabled',
				'term'    => 'disabled',
				'comment' => 'disabled',
			)
		);
	}
}