<?php
declare(strict_types=1);

use PHPUnit\Framework\TestCase;

/**
 * Integration test: WPDO_WC_Term_Count_Filter (v2.12.3).
 *
 * Mirrors HivepressTransientFilterTest pattern. Verifies:
 *   - is_target_key matches `product_count_*` only
 *   - translate_key namespaces by term_id + md5 of meta_key
 *   - Round-trip: write → read returns correct value from wp_options
 *   - delete clears wp_options entry
 *   - Non-target keys pass through (filter returns null)
 *   - count/purge legacy SQL helpers
 *   - Toggle option respected
 */
class WCTermCountFilterTest extends TestCase {

	private const TERMMETA = 'wp_itest_termmeta';

	public static function setUpBeforeClass(): void {
		global $wpdb;

		// Ensure termmeta table exists for purge SQL tests.
		$wpdb->query(
			'CREATE TABLE IF NOT EXISTS `' . self::TERMMETA . '` (
				meta_id bigint(20) unsigned NOT NULL AUTO_INCREMENT,
				term_id bigint(20) unsigned NOT NULL DEFAULT 0,
				meta_key varchar(255) DEFAULT NULL,
				meta_value longtext,
				PRIMARY KEY (meta_id),
				KEY term_id (term_id),
				KEY meta_key (meta_key(191))
			) DEFAULT CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci'
		);
	}

	protected function setUp(): void {
		global $wpdb;
		$wpdb->query( 'TRUNCATE TABLE `' . self::TERMMETA . '`' );
		$GLOBALS['_wp_options'] = array();
		update_option( WPDO_WC_Term_Count_Filter::OPT_ENABLED, '1' );
	}

	// ── is_target_key ────────────────────────────────────────────────────────

	public function test_is_target_key_matches_product_count_prefix(): void {
		$this->assertTrue( WPDO_WC_Term_Count_Filter::is_target_key( 'product_count_product_cat' ) );
		$this->assertTrue( WPDO_WC_Term_Count_Filter::is_target_key( 'product_count_product_tag' ) );
		$this->assertTrue( WPDO_WC_Term_Count_Filter::is_target_key( 'product_count_pa_color' ) );
	}

	public function test_is_target_key_rejects_non_product_count(): void {
		$this->assertFalse( WPDO_WC_Term_Count_Filter::is_target_key( 'hp_sort_order' ) );
		$this->assertFalse( WPDO_WC_Term_Count_Filter::is_target_key( 'hp_default' ) );
		$this->assertFalse( WPDO_WC_Term_Count_Filter::is_target_key( 'product_count' ) ); // exact, not prefix
		$this->assertFalse( WPDO_WC_Term_Count_Filter::is_target_key( 'something_product_count_foo' ) );
	}

	public function test_is_target_key_rejects_non_string(): void {
		$this->assertFalse( WPDO_WC_Term_Count_Filter::is_target_key( null ) );
		$this->assertFalse( WPDO_WC_Term_Count_Filter::is_target_key( 123 ) );
	}

	// ── translate_key ────────────────────────────────────────────────────────

	public function test_translate_key_namespaces_by_term_id(): void {
		$key1 = WPDO_WC_Term_Count_Filter::translate_key( 5, 'product_count_product_cat' );
		$key2 = WPDO_WC_Term_Count_Filter::translate_key( 6, 'product_count_product_cat' );
		$this->assertNotSame( $key1, $key2 );
		$this->assertStringContainsString( 'wpdo_wc_termcount_5_', $key1 );
		$this->assertStringContainsString( 'wpdo_wc_termcount_6_', $key2 );
	}

	public function test_translate_key_md5_handles_long_taxonomy(): void {
		$long_key   = 'product_count_my_super_long_taxonomy_slug_' . str_repeat( 'x', 200 );
		$translated = WPDO_WC_Term_Count_Filter::translate_key( 1, $long_key );
		$option_name = '_transient_' . $translated;
		$this->assertLessThanOrEqual( 191, strlen( $option_name ) );
	}

	// ── on_read ──────────────────────────────────────────────────────────────

	public function test_on_read_returns_pre_for_non_target_key(): void {
		$result = WPDO_WC_Term_Count_Filter::on_read( null, 1, 'hp_sort_order', true );
		$this->assertNull( $result );
	}

	public function test_on_read_returns_value_when_present(): void {
		$translated = WPDO_WC_Term_Count_Filter::translate_key( 5, 'product_count_product_cat' );
		update_option( '_transient_' . $translated, '42' );

		$result = WPDO_WC_Term_Count_Filter::on_read( null, 5, 'product_count_product_cat', true );
		$this->assertSame( array( '42' ), $result );
	}

	public function test_on_read_falls_through_on_cache_miss(): void {
		$result = WPDO_WC_Term_Count_Filter::on_read( null, 5, 'product_count_product_cat', true );
		$this->assertNull( $result, 'Cache miss should fall through (return $pre)' );
	}

	// ── on_add / on_update ───────────────────────────────────────────────────

	public function test_on_add_writes_to_wp_options_and_short_circuits(): void {
		$result = WPDO_WC_Term_Count_Filter::on_add( null, 5, 'product_count_product_cat', '42', false );
		$this->assertTrue( $result );

		$translated = WPDO_WC_Term_Count_Filter::translate_key( 5, 'product_count_product_cat' );
		$this->assertSame( '42', get_option( '_transient_' . $translated ) );
	}

	public function test_on_update_writes_to_wp_options(): void {
		WPDO_WC_Term_Count_Filter::on_update( null, 7, 'product_count_product_tag', '15', '' );
		$translated = WPDO_WC_Term_Count_Filter::translate_key( 7, 'product_count_product_tag' );
		$this->assertSame( '15', get_option( '_transient_' . $translated ) );
	}

	public function test_on_add_passes_through_non_target(): void {
		$this->assertNull( WPDO_WC_Term_Count_Filter::on_add( null, 5, 'hp_sort_order', '5', false ) );
	}

	// ── on_delete ────────────────────────────────────────────────────────────

	public function test_on_delete_clears_wp_options_entry(): void {
		WPDO_WC_Term_Count_Filter::on_update( null, 5, 'product_count_product_cat', '42', '' );
		$translated = WPDO_WC_Term_Count_Filter::translate_key( 5, 'product_count_product_cat' );
		$this->assertSame( '42', get_option( '_transient_' . $translated ) );

		WPDO_WC_Term_Count_Filter::on_delete( null, 5, 'product_count_product_cat', '', false );
		$this->assertFalse( get_option( '_transient_' . $translated ) );
	}

	// ── Round-trip ───────────────────────────────────────────────────────────

	public function test_full_round_trip(): void {
		WPDO_WC_Term_Count_Filter::on_update( null, 12, 'product_count_product_cat', 'serialized_value', '' );

		$value = WPDO_WC_Term_Count_Filter::on_read( null, 12, 'product_count_product_cat', true );
		$this->assertSame( array( 'serialized_value' ), $value );
	}

	// ── count/purge legacy ──────────────────────────────────────────────────

	public function test_count_legacy_termmeta_returns_zero_for_clean(): void {
		$this->assertSame( 0, WPDO_WC_Term_Count_Filter::count_legacy_termmeta_rows() );
	}

	public function test_count_legacy_termmeta_counts_only_product_count(): void {
		global $wpdb;
		$rows = array(
			array( 'term_id' => 1, 'meta_key' => 'product_count_product_cat', 'meta_value' => '42' ),
			array( 'term_id' => 2, 'meta_key' => 'product_count_product_tag', 'meta_value' => '15' ),
			array( 'term_id' => 1, 'meta_key' => 'hp_sort_order', 'meta_value' => '5' ), // not target
		);
		foreach ( $rows as $r ) {
			$wpdb->insert( self::TERMMETA, $r );
		}

		$this->assertSame( 2, WPDO_WC_Term_Count_Filter::count_legacy_termmeta_rows() );
	}

	public function test_purge_legacy_termmeta_deletes_only_product_count(): void {
		global $wpdb;
		$wpdb->insert( self::TERMMETA, array( 'term_id' => 1, 'meta_key' => 'product_count_product_cat', 'meta_value' => '42' ) );
		$wpdb->insert( self::TERMMETA, array( 'term_id' => 2, 'meta_key' => 'hp_sort_order', 'meta_value' => '5' ) );

		$deleted = WPDO_WC_Term_Count_Filter::purge_legacy_termmeta_rows();
		$this->assertSame( 1, $deleted );

		$remaining = (int) $wpdb->get_var( 'SELECT COUNT(*) FROM `' . self::TERMMETA . '`' );
		$this->assertSame( 1, $remaining );
	}

	// ── is_enabled ──────────────────────────────────────────────────────────

	public function test_is_enabled_defaults_true(): void {
		delete_option( WPDO_WC_Term_Count_Filter::OPT_ENABLED );
		$this->assertTrue( WPDO_WC_Term_Count_Filter::is_enabled() );
	}

	public function test_is_enabled_respects_zero_value(): void {
		update_option( WPDO_WC_Term_Count_Filter::OPT_ENABLED, '0' );
		$this->assertFalse( WPDO_WC_Term_Count_Filter::is_enabled() );
	}
}