<?php
declare(strict_types=1);

use PHPUnit\Framework\TestCase;

/**
 * Unit tests for WPDO_Hook_Bus_Bridge — PR-3 feature-flag + conflict detection.
 *
 * @covers WPDO_Hook_Bus_Bridge
 */
class HookBusBridgeTest extends TestCase {

	protected function setUp(): void {
		WPDO_Hook_Bus_Bridge::reset_cache();
		// Reset $GLOBALS['_wp_options'] for each test isolation.
		$GLOBALS['_wp_options'] = array();
	}

	// ── is_enabled() ────────────────────────────────────────────────────────

	public function test_is_enabled_default_true(): void {
		// v2.5.4: Hook Bus is ON by default; option not set → true.
		$this->assertTrue( WPDO_Hook_Bus_Bridge::is_enabled() );
	}

	public function test_is_enabled_when_option_set_to_string_one(): void {
		update_option( WPDO_Hook_Bus_Bridge::OPTION, '1' );
		WPDO_Hook_Bus_Bridge::reset_cache();
		$this->assertTrue( WPDO_Hook_Bus_Bridge::is_enabled() );
	}

	public function test_is_enabled_when_option_set_to_bool_true(): void {
		update_option( WPDO_Hook_Bus_Bridge::OPTION, true );
		WPDO_Hook_Bus_Bridge::reset_cache();
		$this->assertTrue( WPDO_Hook_Bus_Bridge::is_enabled() );
	}

	public function test_is_enabled_when_option_set_to_zero(): void {
		update_option( WPDO_Hook_Bus_Bridge::OPTION, '0' );
		WPDO_Hook_Bus_Bridge::reset_cache();
		$this->assertFalse( WPDO_Hook_Bus_Bridge::is_enabled() );
	}

	public function test_is_enabled_caches_result(): void {
		update_option( WPDO_Hook_Bus_Bridge::OPTION, '1' );
		WPDO_Hook_Bus_Bridge::reset_cache();
		$first = WPDO_Hook_Bus_Bridge::is_enabled();

		// Mutate the option, but cache should retain previous value until reset.
		update_option( WPDO_Hook_Bus_Bridge::OPTION, '0' );
		$second = WPDO_Hook_Bus_Bridge::is_enabled();
		$this->assertSame( $first, $second, 'Cache must be sticky within a request' );

		// After explicit reset → new value visible.
		WPDO_Hook_Bus_Bridge::reset_cache();
		$this->assertFalse( WPDO_Hook_Bus_Bridge::is_enabled() );
	}

	// ── maybe_init_hook_bus() ───────────────────────────────────────────────

	public function test_maybe_init_hook_bus_noop_when_disabled(): void {
		// Disabled → must not throw even if WPDO_Hook_Bus class missing.
		WPDO_Hook_Bus_Bridge::maybe_init_hook_bus();
		$this->assertTrue( true );
	}

	// ── detect_intra_wpdo_conflicts() ───────────────────────────────────────

	public function test_detect_intra_wpdo_conflicts_returns_empty_when_no_filters(): void {
		// Stub bootstrap doesn't populate $wp_filter, so result is empty array.
		$conflicts = WPDO_Hook_Bus_Bridge::detect_intra_wpdo_conflicts();
		$this->assertIsArray( $conflicts );
		$this->assertEmpty( $conflicts );
	}

	public function test_detect_intra_wpdo_conflicts_flags_multiple_wpdo_callbacks(): void {
		// Simulate $wp_filter with two WPDO_* callbacks on the same hook.
		$GLOBALS['wp_filter'] = array(
			'update_post_metadata' => new class() {
				public array $callbacks;
				public function __construct() {
					$this->callbacks = array(
						10 => array(
							array(
								'function' => array(
									new class() {
										public function intercept_update() {}
									},
									'intercept_update',
								),
							),
						),
						8  => array(
							array(
								'function' => array(
									new class() {
										public function intercept_update() {}
									},
									'intercept_update',
								),
							),
						),
					);
				}
			},
		);

		// The anonymous classes won't have WPDO_ prefix → must not flag conflict.
		$conflicts = WPDO_Hook_Bus_Bridge::detect_intra_wpdo_conflicts();
		$this->assertEmpty( $conflicts, 'Non-WPDO classes must not be flagged' );
	}
}