<?php
declare(strict_types=1);

use PHPUnit\Framework\TestCase;

/**
 * Unit tests for WPDO_Post_Fields entity group registration (v2.9.1).
 *
 * Verifies that register_entity_fields() correctly registers all four
 * post groups with the expected field counts, types, and post_type targets.
 *
 * Mirrors MemberFieldsRegistrationTest's structure.
 */
class PostFieldsRegistrationTest extends TestCase {

	protected function setUp(): void {
		if ( ! class_exists( 'WPDO_Post_Fields' ) ) {
			require_once WPDO_PLUGIN_DIR . 'includes/integrations/class-tmdo-post-fields.php';
		}
		if ( ! class_exists( 'WPDO_Adapter_Post' ) ) {
			require_once WPDO_PLUGIN_DIR . 'includes/adapters/class-tmdo-adapter-post.php';
		}

		WPDO_Entity_Registry::init();
		WPDO_Entity_Registry::register_adapter( 'post', new WPDO_Adapter_Post() );
	}

	// ── Group presence ───────────────────────────────────────────────────────

	public function test_register_entity_fields_does_not_throw_on_double_call(): void {
		WPDO_Post_Fields::register_entity_fields();
		WPDO_Post_Fields::register_entity_fields(); // dedup guard
		$this->assertTrue( true );
	}

	public function test_the_core_groups_are_registered(): void {
		WPDO_Post_Fields::register_entity_fields();

		$expected = array(
			'wp_core',
			'attachment',
			'nav_menu_item',
		);

		foreach ( $expected as $group ) {
			$fields = WPDO_Entity_Registry::get_group_fields( 'post', $group );
			$this->assertNotEmpty( $fields, "Group '{$group}' should have registered fields." );
		}
	}

	public function test_user_entity_groups_are_not_touched(): void {
		// 🔒 Frozen contract: post fields registration must not register
		// any group under entity_type='user'.
		WPDO_Post_Fields::register_entity_fields();
		$user_groups = WPDO_Entity_Registry::get_groups_for_type( 'user' );
		$this->assertEmpty( $user_groups, 'WPDO_Post_Fields must not touch user entity registry.' );
	}

	// ── wp_core group (cross post_type) ──────────────────────────────────────

	public function test_wp_core_group_has_expected_keys(): void {
		WPDO_Post_Fields::register_entity_fields();
		$keys = $this->get_field_keys( 'wp_core' );
		$this->assertContains( '_thumbnail_id', $keys );
		$this->assertContains( '_wp_page_template', $keys );
		$this->assertContains( '_edit_last', $keys );
	}

	public function test_wp_core_thumbnail_is_searchable(): void {
		WPDO_Post_Fields::register_entity_fields();
		$field = $this->find_field( 'wp_core', '_thumbnail_id' );
		$this->assertNotNull( $field );
		$this->assertSame( 'integer', $field['type'] );
		$this->assertTrue( (bool) ( $field['searchable'] ?? false ) );
	}

	// ── attachment group ─────────────────────────────────────────────────────

	public function test_attachment_group_has_expected_keys(): void {
		WPDO_Post_Fields::register_entity_fields();
		$keys = $this->get_field_keys( 'attachment' );
		$this->assertContains( '_wp_attached_file', $keys );
		$this->assertContains( '_wp_attachment_metadata', $keys );
		$this->assertContains( '_wp_attachment_image_alt', $keys );
	}

	public function test_attachment_metadata_is_json_type(): void {
		WPDO_Post_Fields::register_entity_fields();
		$field = $this->find_field( 'attachment', '_wp_attachment_metadata' );
		$this->assertNotNull( $field );
		$this->assertSame( 'json', $field['type'] );
	}

	// ── WooCommerce products stay in native meta (2.2 PR-077) ───────────────

	public function test_core_registers_no_woocommerce_product_group(): void {
		WPDO_Post_Fields::register_entity_fields();

		$this->assertSame( array(), WPDO_Entity_Registry::get_group_fields( 'post', 'wc_product' ), 'WooCommerce reads and writes product meta directly (stock by SQL)' );
		$this->assertNull( WPDO_Entity_Registry::get_field( 'post', '_price', 'product' ) );
		$this->assertSame( array(), WPDO_Post_Fields::groups_for_post_type( 'product' ) );
	}

	// ── HivePress groups moved to the HivePress AddOn ───────────────────────

	public function test_core_registers_no_hivepress_groups(): void {
		WPDO_Post_Fields::register_entity_fields();
		foreach ( array( 'hp_listing_core', 'hp_request_core', 'hp_vendor_core' ) as $group ) {
			$this->assertSame( array(), WPDO_Entity_Registry::get_group_fields( 'post', $group ), "{$group} is owned by the HivePress AddOn" );
		}
	}

	// ── group ↔ post_type mapping ────────────────────────────────────────────

	public function test_core_groups_map_to_their_post_types(): void {
		$this->assertSame( 'attachment', WPDO_Post_Fields::post_type_for_group( 'attachment' ) );
		$this->assertSame( 'nav_menu_item', WPDO_Post_Fields::post_type_for_group( 'nav_menu_item' ) );
		$this->assertNull( WPDO_Post_Fields::post_type_for_group( 'wp_core' ), 'wp_core spans every post type' );
	}

	public function test_scoped_groups_map_through_the_registry(): void {
		WPDO_Entity_Registry::register_group( 'post', 'x_core', array( array( 'key' => 'x_price', 'type' => 'decimal' ) ), array( 'post_types' => array( 'x_type' ) ) );

		$this->assertSame( 'x_type', WPDO_Post_Fields::post_type_for_group( 'x_core' ) );
		$this->assertSame( array( 'x_core' ), WPDO_Post_Fields::groups_for_post_type( 'x_type' ) );
		$this->assertNull( WPDO_Post_Fields::post_type_for_group( 'hp_listing_core' ), 'unregistered HivePress group is unknown to core' );
	}

	// ── nav_menu_item group ──────────────────────────────────────────────────

	public function test_nav_menu_item_has_8_keys(): void {
		WPDO_Post_Fields::register_entity_fields();
		$keys = $this->get_field_keys( 'nav_menu_item' );
		$this->assertCount( 8, $keys );
		$this->assertContains( '_menu_item_type', $keys );
		$this->assertContains( '_menu_item_object_id', $keys );
		$this->assertContains( '_menu_item_url', $keys );
	}

	// ── Helpers ──────────────────────────────────────────────────────────────

	/** @return string[] */
	private function get_field_keys( string $group ): array {
		$fields = WPDO_Entity_Registry::get_group_fields( 'post', $group );
		return array_map( static fn( $f ) => $f['key'], $fields );
	}

	private function find_field( string $group, string $key ): ?array {
		$fields = WPDO_Entity_Registry::get_group_fields( 'post', $group );
		foreach ( $fields as $f ) {
			if ( ( $f['key'] ?? '' ) === $key ) {
				return $f;
			}
		}
		return null;
	}
}