<?php
declare(strict_types=1);

use PHPUnit\Framework\TestCase;

/**
 * Unit tests for WPDO_API — public facade for partner plugins (PR-5).
 *
 * @covers WPDO_API
 */
class PublicApiTest extends TestCase {

	protected function setUp(): void {
		$GLOBALS['_wp_postmeta']    = array();
		$GLOBALS['_wp_usermeta']    = array();
		$GLOBALS['_wp_termmeta']    = array();
		$GLOBALS['_wp_commentmeta'] = array();
		$GLOBALS['_wp_options']     = array();

		// Reset Schema_Registry singleton.
		$ref      = new ReflectionClass( WPDO_Schema_Registry::class );
		$instance = $ref->getProperty( 'instance' );
		$instance->setAccessible( true );
		$instance->setValue( null, null );

		// Reset Feature_Flags caches (state pollution between tests).
		$ref = new ReflectionClass( WPDO_Feature_Flags::class );
		foreach ( array( 'cache', 'shadow_cache' ) as $prop ) {
			$p = $ref->getProperty( $prop );
			$p->setAccessible( true );
			$p->setValue( null, null );
		}

		// Reset Entity_Registry static state.
		WPDO_Entity_Registry::init();
	}

	// ── get_field / set_field (post entity) ─────────────────────────────────

	public function test_get_field_returns_postmeta_value(): void {
		update_post_meta( 100, 'hp_price', '199.99' );
		$this->assertSame( '199.99', WPDO_API::get_field( 100, 'hp_price' ) );
	}

	public function test_set_field_writes_postmeta(): void {
		WPDO_API::set_field( 200, 'hp_price', '299.99' );
		$this->assertSame( '299.99', get_post_meta( 200, 'hp_price', true ) );
	}

	public function test_get_field_missing_returns_empty_string_when_single(): void {
		$this->assertSame( '', WPDO_API::get_field( 9999, 'nonexistent' ) );
	}

	// ── get_entity / set_entity (multi-entity) ──────────────────────────────

	public function test_get_entity_post_dispatches_correctly(): void {
		update_post_meta( 1, 'k', 'pv' );
		$this->assertSame( 'pv', WPDO_API::get_entity( 'post', 1, 'k' ) );
	}

	public function test_get_entity_unknown_type_returns_null(): void {
		$this->assertNull( WPDO_API::get_entity( 'invalid', 1, 'k' ) );
	}

	public function test_set_entity_unknown_type_returns_false(): void {
		$this->assertFalse( WPDO_API::set_entity( 'invalid', 1, 'k', 'v' ) );
	}

	// ── is_field_registered ─────────────────────────────────────────────────

	public function test_is_field_registered_returns_false_for_unknown(): void {
		$this->assertFalse( WPDO_API::is_field_registered( 'post', 'unregistered_key' ) );
	}

	public function test_is_field_registered_true_after_schema_register(): void {
		WPDO_Schema_Registry::instance()->register(
			'test',
			array(
				'post_type' => 'hp_listing',
				'meta_key'  => 'hp_price',
				'zone'      => 'hot',
				'data_type' => 'decimal(10,2)',
				'column'    => 'hp_price',
			)
		);

		$this->assertTrue( WPDO_API::is_field_registered( 'post', 'hp_price' ) );
	}

	// ── trace_storage ──────────────────────────────────────────────────────

	public function test_trace_storage_unregistered_when_no_field(): void {
		$this->assertSame(
			'unregistered',
			WPDO_API::trace_storage( 'post', 'unknown', 'hp_listing' )
		);
	}

	public function test_trace_storage_postmeta_when_registered_but_not_cutover(): void {
		WPDO_Schema_Registry::instance()->register(
			'test',
			array(
				'post_type' => 'hp_listing',
				'meta_key'  => 'hp_price',
				'zone'      => 'hot',
				'data_type' => 'decimal(10,2)',
				'column'    => 'hp_price',
			)
		);

		// Module starts in 'idle' → not read-custom → returns 'postmeta'.
		$this->assertSame(
			'postmeta',
			WPDO_API::trace_storage( 'post', 'hp_price', 'hp_listing' )
		);
	}

	public function test_trace_storage_zone_after_cutover(): void {
		$GLOBALS['_wp_options'] = array();
		$ref                    = new ReflectionClass( WPDO_Feature_Flags::class );
		$cache                  = $ref->getProperty( 'cache' );
		$cache->setAccessible( true );
		$cache->setValue( null, null );

		WPDO_Schema_Registry::instance()->register(
			'test',
			array(
				'post_type' => 'hp_listing',
				'meta_key'  => 'hp_price',
				'zone'      => 'hot',
				'data_type' => 'decimal(10,2)',
				'column'    => 'hp_price',
			)
		);

		WPDO_Feature_Flags::set( 'hot_hp_listing', 'cutover' );
		$this->assertSame(
			'zone_hot',
			WPDO_API::trace_storage( 'post', 'hp_price', 'hp_listing' )
		);
	}
}