<?php
declare(strict_types=1);

use PHPUnit\Framework\TestCase;

/**
 * Unit tests for TMDO back-compat layer.
 *
 * Verifies that WPDO_* aliases for classes, traits, and interfaces all resolve
 * correctly so sister plugins compiled against old names continue to work.
 */
class BackCompatTest extends TestCase {

	// ── Trait alias ──────────────────────────────────────────────────────────

	public function test_wpdo_anti_eav_aware_trait_exists(): void {
		$this->assertTrue( trait_exists( 'WPDO_Anti_EAV_Aware' ), 'WPDO_Anti_EAV_Aware trait alias must exist' );
	}

	public function test_class_using_wpdo_anti_eav_aware_is_valid(): void {
		// Verify a class can `use WPDO_Anti_EAV_Aware` without fatal error.
		$obj = new class {
			use WPDO_Anti_EAV_Aware;
		};
		// trait_exists check via class_uses — PHP doesn't support instanceof for traits.
		$this->assertArrayHasKey( 'WPDO_Anti_EAV_Aware', class_uses( $obj ) );
	}

	// ── Interface alias ───────────────────────────────────────────────────────

	public function test_wpdo_entity_adapter_interface_exists(): void {
		$this->assertTrue(
			interface_exists( 'WPDO_Entity_Adapter_Interface' ),
			'WPDO_Entity_Adapter_Interface must exist as a back-compat alias'
		);
	}

	public function test_tmdo_adapter_post_implements_wpdo_interface(): void {
		// An object implementing TMDO_Entity_Adapter_Interface must also
		// satisfy `instanceof WPDO_Entity_Adapter_Interface`.
		$adapter = new TMDO_Adapter_Post();
		$this->assertInstanceOf( 'WPDO_Entity_Adapter_Interface', $adapter );
	}

	// ── DB version consistency ────────────────────────────────────────────────

	public function test_tmdo_db_version_constant_matches_installer_schema(): void {
		// TMDO_DB_VERSION (plugin header constant) must equal TMDO_Installer::SCHEMA_VERSION
		// (private). If they diverge, maybe_upgrade() either never fires or fires every boot.
		$ref            = new ReflectionClass( TMDO_Installer::class );
		$schema_version = $ref->getConstant( 'SCHEMA_VERSION' );
		$this->assertSame( TMDO_DB_VERSION, $schema_version,
			'TMDO_DB_VERSION constant must match TMDO_Installer::SCHEMA_VERSION' );
	}
}