<?php
declare(strict_types=1);

use PHPUnit\Framework\TestCase;

/**
 * Unit tests for WPDO_Conflict_Monitor — production conflict surface.
 *
 * @covers WPDO_Conflict_Monitor
 */
class ConflictMonitorTest extends TestCase {

	protected function setUp(): void {
		WPDO_Conflict_Monitor::reset_cache();
		WPDO_Hook_Bus_Bridge::reset_cache();
		$GLOBALS['_wp_options']  = array();
		$GLOBALS['wp_filter']    = array();
	}

	public function test_scan_returns_empty_when_no_conflicts(): void {
		$result = WPDO_Conflict_Monitor::scan();
		$this->assertIsArray( $result );
		$this->assertEmpty( $result );
	}

	public function test_get_summary_when_clean(): void {
		$summary = WPDO_Conflict_Monitor::get_summary();
		$this->assertSame( 0, $summary['total'] );
		$this->assertSame( 0, $summary['hook_overlap'] );
		$this->assertSame( 0, $summary['uaepg_overlap'] );
	}

	public function test_get_all_conflicts_lazy_scans(): void {
		// First call populates the cache.
		$first = WPDO_Conflict_Monitor::get_all_conflicts();
		$this->assertIsArray( $first );

		// Subsequent calls return the same reference (cached).
		$second = WPDO_Conflict_Monitor::get_all_conflicts();
		$this->assertSame( $first, $second );
	}

	public function test_reset_cache_forces_rescan(): void {
		WPDO_Conflict_Monitor::scan();
		WPDO_Conflict_Monitor::reset_cache();

		// Should not throw and should return empty (still no conflicts).
		$this->assertSame( array(), WPDO_Conflict_Monitor::scan() );
	}

	public function test_summary_keys_always_present(): void {
		$summary = WPDO_Conflict_Monitor::get_summary();
		$this->assertArrayHasKey( 'total', $summary );
		$this->assertArrayHasKey( 'hook_overlap', $summary );
		$this->assertArrayHasKey( 'uaepg_overlap', $summary );
	}

	public function test_admin_notice_is_silent_when_no_conflicts(): void {
		ob_start();
		WPDO_Conflict_Monitor::maybe_render_admin_notice();
		$output = ob_get_clean();
		$this->assertSame( '', $output );
	}

	public function test_admin_bar_is_silent_when_no_conflicts(): void {
		// Pass a valid object stub to admin_bar handler — should no-op when count = 0.
		$stub = new class() {
			public array $nodes = array();
			public function add_node( array $node ): void {
				$this->nodes[] = $node;
			}
		};
		WPDO_Conflict_Monitor::maybe_render_admin_bar( $stub );
		$this->assertCount( 0, $stub->nodes );
	}
}