<?php
declare(strict_types=1);

use PHPUnit\Framework\TestCase;

/**
 * Tests for WPDO_Custom_Table_Registry — partner plugin custom table awareness.
 *
 * Solves audit finding R-3 (Custom Table Provider missing).
 *
 * @covers WPDO_Custom_Table_Registry
 */
class CustomTableRegistryTest extends TestCase {

	protected function setUp(): void {
		WPDO_Custom_Table_Registry::reset_for_tests();
	}

	// ── register() ──────────────────────────────────────────────────────────

	public function test_register_single_table(): void {
		$registry = WPDO_Custom_Table_Registry::instance();
		$ok       = $registry->register( '2meet-courses', array(
			'table_name'     => '2mc_courses',
			'primary_key'    => 'id',
			'post_type_link' => null,
		) );

		$this->assertTrue( $ok );
		$this->assertCount( 1, $registry->all() );
	}

	public function test_register_rejects_empty_table_name(): void {
		$registry = WPDO_Custom_Table_Registry::instance();
		$this->assertFalse( $registry->register( '2meet-courses', array() ) );
		$this->assertFalse( $registry->register( '2meet-courses', array( 'table_name' => '' ) ) );
	}

	public function test_register_rejects_empty_provider(): void {
		$registry = WPDO_Custom_Table_Registry::instance();
		$this->assertFalse( $registry->register( '', array( 'table_name' => '2mc_courses' ) ) );
	}

	public function test_register_rejects_duplicate_provider_table_pair(): void {
		$registry = WPDO_Custom_Table_Registry::instance();
		$this->assertTrue( $registry->register( '2meet-courses', array( 'table_name' => '2mc_courses' ) ) );
		// Same provider+table → false.
		$this->assertFalse( $registry->register( '2meet-courses', array( 'table_name' => '2mc_courses' ) ) );
	}

	public function test_register_allows_same_table_different_provider(): void {
		$registry = WPDO_Custom_Table_Registry::instance();
		$this->assertTrue( $registry->register( '2meet-courses', array( 'table_name' => 'shared_t' ) ) );
		$this->assertTrue( $registry->register( '2meet-bookings', array( 'table_name' => 'shared_t' ) ) );
		$this->assertCount( 2, $registry->all() );
	}

	public function test_register_sanitizes_table_name(): void {
		$registry = WPDO_Custom_Table_Registry::instance();
		// WordPress sanitize_key strips non-alphanumeric/underscore/dash entirely (no replacement).
		$registry->register( 'p', array( 'table_name' => 'My Bad-Name!' ) );

		$tables = $registry->all();
		$cfg    = reset( $tables );
		$this->assertSame( 'mybad-name', $cfg['table_name'] );
	}

	public function test_register_applies_defaults(): void {
		$registry = WPDO_Custom_Table_Registry::instance();
		$registry->register( 'p', array( 'table_name' => 't' ) );

		$tables = $registry->all();
		$cfg    = reset( $tables );
		$this->assertSame( 'id', $cfg['primary_key'] );
		$this->assertNull( $cfg['post_type_link'] );
		$this->assertSame( array(), $cfg['expected_columns'] );
	}

	// ── unregister() ────────────────────────────────────────────────────────

	public function test_unregister_removes_table(): void {
		$registry = WPDO_Custom_Table_Registry::instance();
		$registry->register( 'p', array( 'table_name' => 't' ) );
		$this->assertTrue( $registry->unregister( 'p', 't' ) );
		$this->assertCount( 0, $registry->all() );
	}

	public function test_unregister_returns_false_for_unknown(): void {
		$registry = WPDO_Custom_Table_Registry::instance();
		$this->assertFalse( $registry->unregister( 'unknown', 'table' ) );
	}

	// ── for_provider() / for_post_type() ────────────────────────────────────

	public function test_for_provider_filters_correctly(): void {
		$registry = WPDO_Custom_Table_Registry::instance();
		$registry->register( 'a', array( 'table_name' => 't1' ) );
		$registry->register( 'a', array( 'table_name' => 't2' ) );
		$registry->register( 'b', array( 'table_name' => 't3' ) );

		$this->assertCount( 2, $registry->for_provider( 'a' ) );
		$this->assertCount( 1, $registry->for_provider( 'b' ) );
		$this->assertCount( 0, $registry->for_provider( 'c' ) );
	}

	/**
	 * v2.1.3 R3 hardening — verify by_provider index stays in sync when a
	 * non-edge entry is unregistered. Previously untested per audit finding.
	 */
	public function test_for_provider_after_unregister_middle_entry(): void {
		$registry = WPDO_Custom_Table_Registry::instance();
		$registry->register( 'p', array( 'table_name' => 'first' ) );
		$registry->register( 'p', array( 'table_name' => 'middle' ) );
		$registry->register( 'p', array( 'table_name' => 'last' ) );

		$this->assertCount( 3, $registry->for_provider( 'p' ) );

		// Remove the middle entry.
		$ok = $registry->unregister( 'p', 'middle' );
		$this->assertTrue( $ok );

		$remaining = $registry->for_provider( 'p' );
		$this->assertCount( 2, $remaining );

		// Verify the surviving entries are correct (not 'middle').
		$names = array_column( $remaining, 'table_name' );
		sort( $names );
		$this->assertSame( array( 'first', 'last' ), $names );

		// Re-registering 'middle' should put it back.
		$registry->register( 'p', array( 'table_name' => 'middle' ) );
		$this->assertCount( 3, $registry->for_provider( 'p' ) );
	}

	/**
	 * Verify by_provider index empties (and removes the provider key entirely)
	 * when the last table for that provider is unregistered.
	 */
	public function test_for_provider_returns_empty_after_full_unregister(): void {
		$registry = WPDO_Custom_Table_Registry::instance();
		$registry->register( 'solo', array( 'table_name' => 'only_table' ) );
		$this->assertCount( 1, $registry->for_provider( 'solo' ) );

		$registry->unregister( 'solo', 'only_table' );
		$this->assertCount( 0, $registry->for_provider( 'solo' ) );
		$this->assertSame( array(), $registry->for_provider( 'solo' ) );
	}

	public function test_for_post_type_filters_correctly(): void {
		$registry = WPDO_Custom_Table_Registry::instance();
		$registry->register( 'p', array( 'table_name' => 't1', 'post_type_link' => 'hp_listing' ) );
		$registry->register( 'p', array( 'table_name' => 't2', 'post_type_link' => 'hp_listing' ) );
		$registry->register( 'p', array( 'table_name' => 't3', 'post_type_link' => 'hp_vendor' ) );
		$registry->register( 'p', array( 'table_name' => 't4', 'post_type_link' => null ) );

		$this->assertCount( 2, $registry->for_post_type( 'hp_listing' ) );
		$this->assertCount( 1, $registry->for_post_type( 'hp_vendor' ) );
		$this->assertCount( 0, $registry->for_post_type( 'unknown' ) );
	}

	public function test_providers_returns_unique_list(): void {
		$registry = WPDO_Custom_Table_Registry::instance();
		$registry->register( 'a', array( 'table_name' => 't1' ) );
		$registry->register( 'a', array( 'table_name' => 't2' ) );
		$registry->register( 'b', array( 'table_name' => 't3' ) );

		$providers = $registry->providers();
		sort( $providers );
		$this->assertSame( array( 'a', 'b' ), $providers );
	}

	// ── get_stats() ─────────────────────────────────────────────────────────

	public function test_get_stats_counts_callbacks(): void {
		$registry = WPDO_Custom_Table_Registry::instance();
		$registry->register( 'p', array(
			'table_name'         => 't1',
			'doctor_callback'    => static fn() => array( 'ok' => true ),
			'benchmark_callback' => static fn() => array( 'duration_ms' => 1.0 ),
		) );
		$registry->register( 'p', array( 'table_name' => 't2' ) );

		$stats = $registry->get_stats();
		$this->assertSame( 2, $stats['tables_count'] );
		$this->assertSame( 1, $stats['providers_count'] );
		$this->assertSame( 1, $stats['with_doctor'] );
		$this->assertSame( 1, $stats['with_benchmark'] );
	}

	// ── run_doctor_checks() ─────────────────────────────────────────────────

	public function test_run_doctor_checks_invokes_callbacks(): void {
		$registry = WPDO_Custom_Table_Registry::instance();
		$registry->register( 'p', array(
			'table_name'      => 't1',
			'doctor_callback' => static fn() => array( 'ok' => true, 'message' => 'all good' ),
		) );
		$registry->register( 'p', array(
			'table_name'      => 't2',
			'doctor_callback' => static fn() => array( 'ok' => false, 'message' => 'index missing' ),
		) );
		$registry->register( 'p', array( 'table_name' => 't3' ) ); // No callback → skipped.

		$results = $registry->run_doctor_checks();
		$this->assertCount( 2, $results );
		$this->assertTrue( $results['p:t1']['ok'] );
		$this->assertSame( 'all good', $results['p:t1']['message'] );
		$this->assertFalse( $results['p:t2']['ok'] );
	}

	public function test_run_doctor_checks_passes_table_name_to_callback(): void {
		$registry = WPDO_Custom_Table_Registry::instance();
		$received = null;

		$registry->register( 'wc', array(
			'table_name'      => 'wc_orders',
			'doctor_callback' => static function ( string $table_name ) use ( &$received ): array {
				$received = $table_name;
				return array( 'ok' => true, 'message' => "checked {$table_name}" );
			},
		) );

		$results = $registry->run_doctor_checks();

		$this->assertSame( 'wc_orders', $received, 'callback must receive table_name as first argument' );
		$this->assertSame( 'checked wc_orders', $results['wc:wc_orders']['message'] );
	}

	public function test_run_doctor_checks_catches_throwables(): void {
		$registry = WPDO_Custom_Table_Registry::instance();
		$registry->register( 'p', array(
			'table_name'      => 't1',
			'doctor_callback' => static function () {
				throw new RuntimeException( 'simulated failure' );
			},
		) );

		$results = $registry->run_doctor_checks();
		$this->assertCount( 1, $results );
		$this->assertFalse( $results['p:t1']['ok'] );
		$this->assertStringContainsString( 'simulated failure', $results['p:t1']['message'] );
	}

	// ── fire_registration() idempotency ─────────────────────────────────────

	public function test_fire_registration_is_idempotent(): void {
		$count    = 0;
		add_action( 'wpdo_register_custom_tables', function () use ( &$count ) {
			++$count;
		} );

		$registry = WPDO_Custom_Table_Registry::instance();
		$registry->fire_registration();
		$registry->fire_registration();
		$registry->fire_registration();

		// Stub add_action() in unit bootstrap returns true but does NOT execute callbacks,
		// so the meaningful assertion here is that fire_registration() doesn't throw.
		$this->assertTrue( true );
	}
}