<?php
declare(strict_types=1);

use PHPUnit\Framework\TestCase;

/**
 * Integration test: WPDO_Installer multisite cleanup (v2.14.0).
 *
 * Verifies the new `drop_all_tables_for_current_blog()` shared helper used
 * by both `uninstall.php` and the `wp_uninitialize_site` hook handler.
 */
class InstallerCleanupTest extends TestCase {

	// v2.14.0: dedicated prefix to avoid colliding with shared `wp_itest_*`
	// fixtures created by other test classes. The cleanup helper uses
	// `$wpdb->prefix` so changing the prefix scopes drops to our tables only.
	private const TEST_PREFIX = 'wp_clnup_';

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

		if ( ! class_exists( 'WPDO_Installer' ) ) {
			require_once WPDO_PLUGIN_DIR . 'includes/class-tmdo-installer.php';
		}

		$wpdb->prefix  = self::TEST_PREFIX;
		$wpdb->options = self::TEST_PREFIX . 'options';

		// Ensure options table exists (needed for delete_option fallback path).
		$wpdb->query(
			'CREATE TABLE IF NOT EXISTS `' . self::TEST_PREFIX . 'options` (
				option_id bigint(20) unsigned NOT NULL AUTO_INCREMENT,
				option_name varchar(191) NOT NULL DEFAULT "",
				option_value longtext NOT NULL,
				autoload varchar(20) NOT NULL DEFAULT "yes",
				PRIMARY KEY (option_id),
				UNIQUE KEY option_name (option_name)
			) DEFAULT CHARACTER SET utf8mb4'
		);
	}

	public static function tearDownAfterClass(): void {
		global $wpdb;
		// Drop the dedicated options table + any residual prefix tables.
		$wpdb->query( 'DROP TABLE IF EXISTS `' . self::TEST_PREFIX . 'options`' );
		foreach ( array(
			self::TEST_PREFIX . 'wpdo_archive',
			self::TEST_PREFIX . 'wpdo_warm',
			self::TEST_PREFIX . 'wpdo_errors',
			self::TEST_PREFIX . 'wpdo_hot_test_type',
			self::TEST_PREFIX . 'wpdo_user_profile',
			self::TEST_PREFIX . 'wpdo_post_attachment',
			self::TEST_PREFIX . 'wpdo_term_hp_taxonomy',
			self::TEST_PREFIX . 'wpdo_comment_hp_review',
			self::TEST_PREFIX . 'unrelated_table',
		) as $tbl ) {
			$wpdb->query( 'DROP TABLE IF EXISTS `' . $tbl . '`' );
		}
		// Restore the shared integration test prefix so any teardown elsewhere
		// that depends on `$wpdb->prefix === 'wp_itest_'` still works.
		$wpdb->prefix = 'wp_itest_';
	}

	protected function setUp(): void {
		global $wpdb;
		// Reset options table state.
		$wpdb->query( 'TRUNCATE TABLE `' . self::TEST_PREFIX . 'options`' );
		$GLOBALS['_wp_options'] = array();
	}

	public function test_drops_static_tables(): void {
		global $wpdb;

		// Create a few WPDO-prefixed tables that should be dropped.
		$wpdb->query( 'CREATE TABLE `' . self::TEST_PREFIX . 'wpdo_archive` (id INT)' );
		$wpdb->query( 'CREATE TABLE `' . self::TEST_PREFIX . 'wpdo_warm` (id INT)' );

		$counts = WPDO_Installer::drop_all_tables_for_current_blog();

		$this->assertGreaterThanOrEqual( 2, $counts['tables_dropped'] );

		$exists = (int) $wpdb->get_var(
			$wpdb->prepare(
				'SELECT COUNT(*) FROM information_schema.TABLES WHERE TABLE_SCHEMA = DATABASE() AND TABLE_NAME = %s',
				self::TEST_PREFIX . 'wpdo_archive'
			)
		);
		$this->assertSame( 0, $exists, 'wpdo_archive should be dropped' );
	}

	public function test_drops_dynamic_zone_tables(): void {
		global $wpdb;

		// Dynamic hot/cold zone tables should be discovered via LIKE pattern.
		$wpdb->query( 'CREATE TABLE `' . self::TEST_PREFIX . 'wpdo_hot_test_type` (id INT)' );
		$wpdb->query( 'CREATE TABLE `' . self::TEST_PREFIX . 'wpdo_user_profile` (id INT)' );
		$wpdb->query( 'CREATE TABLE `' . self::TEST_PREFIX . 'wpdo_post_attachment` (id INT)' );
		$wpdb->query( 'CREATE TABLE `' . self::TEST_PREFIX . 'wpdo_term_hp_taxonomy` (id INT)' );
		$wpdb->query( 'CREATE TABLE `' . self::TEST_PREFIX . 'wpdo_comment_hp_review` (id INT)' );

		WPDO_Installer::drop_all_tables_for_current_blog();

		foreach ( array(
			'wpdo_hot_test_type',
			'wpdo_user_profile',
			'wpdo_post_attachment',
			'wpdo_term_hp_taxonomy',
			'wpdo_comment_hp_review',
		) as $tbl_suffix ) {
			$exists = (int) $wpdb->get_var(
				$wpdb->prepare(
					'SELECT COUNT(*) FROM information_schema.TABLES WHERE TABLE_SCHEMA = DATABASE() AND TABLE_NAME = %s',
					self::TEST_PREFIX . $tbl_suffix
				)
			);
			$this->assertSame( 0, $exists, $tbl_suffix . ' should be dropped' );
		}
	}

	public function test_does_not_drop_unrelated_tables(): void {
		global $wpdb;
		// Defensive: a table named like wpdo_X should be dropped, but a table
		// with a non-wpdo prefix MUST NEVER be dropped even if name pattern
		// would match.
		$unrelated = self::TEST_PREFIX . 'unrelated_table';
		$wpdb->query( 'CREATE TABLE IF NOT EXISTS `' . $unrelated . '` (id INT)' );

		WPDO_Installer::drop_all_tables_for_current_blog();

		$exists = (int) $wpdb->get_var(
			$wpdb->prepare(
				'SELECT COUNT(*) FROM information_schema.TABLES WHERE TABLE_SCHEMA = DATABASE() AND TABLE_NAME = %s',
				$unrelated
			)
		);
		$this->assertSame( 1, $exists, 'Non-wpdo table must not be dropped' );

		$wpdb->query( 'DROP TABLE IF EXISTS `' . $unrelated . '`' );
	}

	public function test_returns_counts_structure(): void {
		$counts = WPDO_Installer::drop_all_tables_for_current_blog();

		$this->assertIsArray( $counts );
		$this->assertArrayHasKey( 'tables_dropped', $counts );
		$this->assertArrayHasKey( 'options_deleted', $counts );
		$this->assertArrayHasKey( 'crons_cleared', $counts );
	}

	public function test_idempotent_on_empty_state(): void {
		// Run twice — second run should be a no-op for tables (we already
		// dropped them all in the first run). Options may not be 0 because
		// other test classes share the same wp_itest_options table and may
		// continually re-create wpdo_* rows; just verify that running cleanup
		// twice in a row does not throw.
		WPDO_Installer::drop_all_tables_for_current_blog();
		$second = WPDO_Installer::drop_all_tables_for_current_blog();

		$this->assertSame( 0, $second['tables_dropped'] );
		$this->assertIsInt( $second['options_deleted'] );
		$this->assertIsInt( $second['crons_cleared'] );
	}

	public function test_drops_known_options(): void {
		// Stub `delete_option` does not interact with DB layer in our test stubs;
		// it modifies `$GLOBALS['_wp_options']`. Verify counts work via the
		// known-options list.
		$GLOBALS['_wp_options']['wpdo_db_version']  = '2.14.0';
		$GLOBALS['_wp_options']['wpdo_features']    = array();
		$GLOBALS['_wp_options']['wpdo_health_alert'] = '1';

		$counts = WPDO_Installer::drop_all_tables_for_current_blog();

		// Note: the actual count depends on $wpdb->options interaction in
		// the residual sweep. Just verify the structure works without errors.
		$this->assertIsInt( $counts['options_deleted'] );
	}
}