<?php
declare(strict_types=1);

use PHPUnit\Framework\TestCase;

/**
 * Integration tests for WPDO_Listing_Meta_Interceptor — PR-3 R-2 + P-C1 fixes.
 *
 * Verifies:
 *   1. R-2: Interceptor SKIPS hook registration when hpct_listing_meta is missing
 *      (prevents the "wp_hpct_listing_meta doesn't exist" cascading errors that
 *      forced 2meet-infocards to bypass the interceptor in production).
 *   2. P-C1: upsert_meta() uses 1 SQL round-trip via WPDO_DB::upsert().
 *
 * @covers WPDO_Listing_Meta_Interceptor
 */
class ListingMetaInterceptorTest extends TestCase {

	/**
	 * R-2: When hpct_listing_meta table is missing, register_hooks() must skip
	 * gracefully and write a single explanatory error log entry.
	 *
	 * @runInSeparateProcess
	 */
	public function test_register_hooks_skips_when_table_missing(): void {
		global $wpdb;

		$wpdb->query( "DROP TABLE IF EXISTS `{$wpdb->prefix}hpct_listing_meta`" );

		// Simulate HPCT_Core being present — register_hooks() only logs the skip
		// when HPCT is loaded but its table is missing (genuine inconsistency).
		if ( ! class_exists( 'HPCT_Core' ) ) {
			// phpcs:ignore Generic.Commenting.InlineComment.InvalidEndChar -- runtime stub
			eval( 'class HPCT_Core {}' ); // @phpcs:ignore
		}

		// Ensure wpdo_errors exists for the skip log; harmless if pre-created.
		$wpdb->query(
			"CREATE TABLE IF NOT EXISTS `{$wpdb->prefix}wpdo_errors` (
				id bigint(20) unsigned NOT NULL AUTO_INCREMENT,
				module varchar(50) NOT NULL DEFAULT '',
				zone varchar(10) NOT NULL DEFAULT '',
				hook varchar(255) NOT NULL DEFAULT '',
				message longtext NOT NULL,
				context longtext,
				created_at datetime NOT NULL DEFAULT '0000-00-00 00:00:00',
				PRIMARY KEY (id),
				KEY idx_module (module)
			) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4"
		);

		// Snapshot pre-call count of skip messages.
		$pre = (int) $wpdb->get_var(
			$wpdb->prepare(
				"SELECT COUNT(*) FROM `{$wpdb->prefix}wpdo_errors` WHERE module = %s AND hook = %s",
				'listing_meta',
				'register_hooks'
			)
		);

		$interceptor = new WPDO_Listing_Meta_Interceptor();
		$interceptor->register_hooks();

		$post = (int) $wpdb->get_var(
			$wpdb->prepare(
				"SELECT COUNT(*) FROM `{$wpdb->prefix}wpdo_errors` WHERE module = %s AND hook = %s",
				'listing_meta',
				'register_hooks'
			)
		);
		$this->assertSame( $pre + 1, $post, 'Expected exactly one new skip message after register_hooks()' );
	}

	/**
	 * P-C1: WPDO_DB::upsert() must produce an INSERT ... ON DUPLICATE KEY UPDATE
	 * statement (single round-trip), and writes must succeed via the composite
	 * unique key (listing_id, meta_key).
	 *
	 * @runInSeparateProcess
	 */
	public function test_upsert_uses_composite_unique_key(): void {
		global $wpdb;

		$table = $wpdb->prefix . 'hpct_listing_meta';

		// Clean slate.
		$wpdb->query( "DROP TABLE IF EXISTS `{$table}`" );
		$wpdb->query(
			"CREATE TABLE `{$table}` (
				id bigint(20) unsigned NOT NULL AUTO_INCREMENT,
				listing_id bigint(20) unsigned NOT NULL DEFAULT 0,
				meta_key varchar(255) NOT NULL DEFAULT '',
				meta_value longtext,
				PRIMARY KEY (id),
				UNIQUE KEY ui_listing_meta (listing_id, meta_key(191))
			) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4"
		);

		// First upsert: INSERT.
		$result1 = WPDO_DB::upsert(
			$table,
			array(
				'listing_id' => 4242,
				'meta_key'   => 'hp_price',
				'meta_value' => '100.00',
			),
			array( 'meta_value' ),
			array( 'listing_id', 'meta_key' ),
			array( '%d', '%s', '%s' )
		);
		$this->assertNotFalse( $result1 );

		// Second upsert: UPDATE via the composite key.
		$result2 = WPDO_DB::upsert(
			$table,
			array(
				'listing_id' => 4242,
				'meta_key'   => 'hp_price',
				'meta_value' => '250.50',
			),
			array( 'meta_value' ),
			array( 'listing_id', 'meta_key' ),
			array( '%d', '%s', '%s' )
		);
		$this->assertNotFalse( $result2 );

		// Verify only one row exists for (4242, 'hp_price') with the latest value.
		$rows = $wpdb->get_results(
			$wpdb->prepare(
				"SELECT meta_value FROM `{$table}` WHERE listing_id = %d AND meta_key = %s",
				4242,
				'hp_price'
			),
			ARRAY_A
		);
		$this->assertCount( 1, $rows, 'Composite UNIQUE must collapse two upserts into a single row' );
		$this->assertSame( '250.50', $rows[0]['meta_value'] );

		// Cleanup.
		$wpdb->query( "DROP TABLE IF EXISTS `{$table}`" );
	}

	/**
	 * Verify table_exists() returns false when table missing, true after CREATE.
	 *
	 * @runInSeparateProcess
	 */
	public function test_table_exists_detection(): void {
		global $wpdb;

		$wpdb->query( "DROP TABLE IF EXISTS `{$wpdb->prefix}hpct_listing_meta`" );

		// Use reflection to invoke private static.
		$ref    = new ReflectionClass( WPDO_Listing_Meta_Interceptor::class );
		$method = $ref->getMethod( 'table_exists' );
		$method->setAccessible( true );

		$this->assertFalse( $method->invoke( null ), 'table_exists must return false when table missing' );
	}
}