<?php
declare(strict_types=1);

use PHPUnit\Framework\TestCase;

/**
 * Integration tests for WPDO_Zone_Cold against real MariaDB.
 *
 * Creates a dedicated cold table (wp_itest_wpdo_cold_itest) to exercise all
 * Zone C operations: set / get, set_many / get_blob, remove, delete, and
 * Object Cache invalidation.
 *
 * post_type = 'itest' maps to table prefix wp_itest_wpdo_cold_itest.
 */
class ZoneColdIntegrationTest extends TestCase {

	private const POST_TYPE = 'itest';

	/** Derived at runtime: $wpdb->prefix . 'wpdo_cold_itest' */
	private static string $table;

	// ── Fixture lifecycle ─────────────────────────────────────────────────────

	public static function setUpBeforeClass(): void {
		global $wpdb;
		self::$table = $wpdb->prefix . 'wpdo_cold_' . self::POST_TYPE;

		$wpdb->query(
			"CREATE TABLE IF NOT EXISTS `" . self::$table . "` (
				id         BIGINT(20) UNSIGNED NOT NULL AUTO_INCREMENT,
				post_id    BIGINT(20) UNSIGNED NOT NULL DEFAULT 0,
				data       LONGTEXT            NOT NULL,
				updated_at DATETIME            NOT NULL DEFAULT '0000-00-00 00:00:00',
				PRIMARY KEY (id),
				UNIQUE KEY ui_post_id (post_id)
			) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4"
		);
	}

	public static function tearDownAfterClass(): void {
		global $wpdb;
		$wpdb->query( "DROP TABLE IF EXISTS `" . self::$table . "`" );
	}

	protected function setUp(): void {
		global $wpdb;
		$wpdb->query( "TRUNCATE TABLE `" . self::$table . "`" );
		$GLOBALS['_wp_cache'] = [];
	}

	// ── set / get ─────────────────────────────────────────────────────────────

	public function test_set_and_get_single_field(): void {
		WPDO_Zone_Cold::set( 100, self::POST_TYPE, 'hp_description', 'Hello World' );
		$val = WPDO_Zone_Cold::get( 100, self::POST_TYPE, 'hp_description' );
		$this->assertSame( 'Hello World', $val );
	}

	public function test_get_returns_null_for_missing_key(): void {
		WPDO_Zone_Cold::set( 101, self::POST_TYPE, 'hp_description', 'present' );
		$val = WPDO_Zone_Cold::get( 101, self::POST_TYPE, 'missing_key' );
		$this->assertNull( $val );
	}

	public function test_get_returns_null_for_missing_post(): void {
		$val = WPDO_Zone_Cold::get( 9999, self::POST_TYPE, 'hp_description' );
		$this->assertNull( $val );
	}

	public function test_set_overwrites_existing_value(): void {
		WPDO_Zone_Cold::set( 102, self::POST_TYPE, 'hp_website', 'http://old.example.com' );
		WPDO_Zone_Cold::set( 102, self::POST_TYPE, 'hp_website', 'http://new.example.com' );
		$val = WPDO_Zone_Cold::get( 102, self::POST_TYPE, 'hp_website' );
		$this->assertSame( 'http://new.example.com', $val );
	}

	public function test_set_preserves_other_keys_in_blob(): void {
		WPDO_Zone_Cold::set( 103, self::POST_TYPE, 'hp_description', 'Keep me' );
		WPDO_Zone_Cold::set( 103, self::POST_TYPE, 'hp_website',     'https://keep.example.com' );

		// Update only one key.
		WPDO_Zone_Cold::set( 103, self::POST_TYPE, 'hp_website', 'https://updated.example.com' );

		$this->assertSame( 'Keep me',                        WPDO_Zone_Cold::get( 103, self::POST_TYPE, 'hp_description' ) );
		$this->assertSame( 'https://updated.example.com', WPDO_Zone_Cold::get( 103, self::POST_TYPE, 'hp_website' ) );
	}

	// ── set_many / get_blob ───────────────────────────────────────────────────

	public function test_set_many_stores_multiple_fields(): void {
		WPDO_Zone_Cold::set_many( 200, self::POST_TYPE, [
			'hp_description' => 'A great listing',
			'hp_website'     => 'https://example.com',
			'hp_facebook'    => 'https://facebook.com/test',
		] );

		$this->assertSame( 'A great listing',           WPDO_Zone_Cold::get( 200, self::POST_TYPE, 'hp_description' ) );
		$this->assertSame( 'https://example.com',       WPDO_Zone_Cold::get( 200, self::POST_TYPE, 'hp_website' ) );
		$this->assertSame( 'https://facebook.com/test', WPDO_Zone_Cold::get( 200, self::POST_TYPE, 'hp_facebook' ) );
	}

	public function test_get_blob_returns_all_fields(): void {
		WPDO_Zone_Cold::set_many( 201, self::POST_TYPE, [
			'hp_description' => 'Blob test',
			'hp_website'     => 'https://blob.example.com',
		] );

		$blob = WPDO_Zone_Cold::get_blob( 201, self::POST_TYPE );
		$this->assertIsArray( $blob );
		$this->assertArrayHasKey( 'hp_description', $blob );
		$this->assertArrayHasKey( 'hp_website',     $blob );
		$this->assertSame( 'Blob test',                 $blob['hp_description'] );
		$this->assertSame( 'https://blob.example.com',  $blob['hp_website'] );
	}

	public function test_get_blob_returns_empty_array_for_missing_post(): void {
		$blob = WPDO_Zone_Cold::get_blob( 9998, self::POST_TYPE );
		$this->assertIsArray( $blob );
		$this->assertEmpty( $blob );
	}

	public function test_set_many_merges_with_existing_blob(): void {
		WPDO_Zone_Cold::set_many( 202, self::POST_TYPE, [ 'hp_description' => 'First' ] );
		WPDO_Zone_Cold::set_many( 202, self::POST_TYPE, [ 'hp_website' => 'https://merge.example.com' ] );

		$this->assertSame( 'First',                        WPDO_Zone_Cold::get( 202, self::POST_TYPE, 'hp_description' ) );
		$this->assertSame( 'https://merge.example.com', WPDO_Zone_Cold::get( 202, self::POST_TYPE, 'hp_website' ) );
	}

	// ── remove ────────────────────────────────────────────────────────────────

	public function test_remove_key_from_blob(): void {
		WPDO_Zone_Cold::set_many( 300, self::POST_TYPE, [
			'hp_description' => 'Keep me',
			'hp_website'     => 'https://remove.example.com',
		] );

		WPDO_Zone_Cold::remove( 300, self::POST_TYPE, 'hp_website' );

		$this->assertSame( 'Keep me', WPDO_Zone_Cold::get( 300, self::POST_TYPE, 'hp_description' ) );
		$this->assertNull( WPDO_Zone_Cold::get( 300, self::POST_TYPE, 'hp_website' ) );
	}

	public function test_remove_nonexistent_key_does_not_error(): void {
		WPDO_Zone_Cold::set( 301, self::POST_TYPE, 'hp_description', 'Safe' );
		WPDO_Zone_Cold::remove( 301, self::POST_TYPE, 'no_such_key' );
		// Original key should still be intact.
		$this->assertSame( 'Safe', WPDO_Zone_Cold::get( 301, self::POST_TYPE, 'hp_description' ) );
	}

	// ── delete ────────────────────────────────────────────────────────────────

	public function test_delete_removes_row(): void {
		global $wpdb;
		WPDO_Zone_Cold::set( 400, self::POST_TYPE, 'hp_description', 'To be deleted' );

		WPDO_Zone_Cold::delete( 400, self::POST_TYPE );

		$count = (int) $wpdb->get_var( "SELECT COUNT(*) FROM `" . self::$table . "` WHERE post_id = 400" );
		$this->assertSame( 0, $count );
		$this->assertNull( WPDO_Zone_Cold::get( 400, self::POST_TYPE, 'hp_description' ) );
	}

	public function test_delete_nonexistent_post_does_not_error(): void {
		WPDO_Zone_Cold::delete( 9997, self::POST_TYPE );
		$this->assertTrue( true ); // Must not throw.
	}

	// ── Object Cache ──────────────────────────────────────────────────────────

	public function test_get_blob_populates_object_cache(): void {
		WPDO_Zone_Cold::set( 500, self::POST_TYPE, 'hp_description', 'Cached value' );

		// Clear cache to force a DB read on the next call.
		$GLOBALS['_wp_cache'] = [];

		// First get: reads from DB, warms the cache.
		$val = WPDO_Zone_Cold::get( 500, self::POST_TYPE, 'hp_description' );
		$this->assertSame( 'Cached value', $val );

		// Cache entry must now exist.
		$cached = wp_cache_get( 'cold_500', 'wpdo_cold_itest' );
		$this->assertIsArray( $cached );
		$this->assertSame( 'Cached value', $cached['hp_description'] );
	}

	public function test_set_invalidates_object_cache(): void {
		WPDO_Zone_Cold::set( 501, self::POST_TYPE, 'hp_description', 'Original' );

		// Warm the cache by reading once.
		WPDO_Zone_Cold::get( 501, self::POST_TYPE, 'hp_description' );
		$this->assertNotFalse( wp_cache_get( 'cold_501', 'wpdo_cold_itest' ) );

		// Write a new value — must invalidate the cached blob.
		WPDO_Zone_Cold::set( 501, self::POST_TYPE, 'hp_description', 'Updated' );
		$this->assertFalse( wp_cache_get( 'cold_501', 'wpdo_cold_itest' ) );

		// Subsequent read must return the updated value (from DB).
		$val = WPDO_Zone_Cold::get( 501, self::POST_TYPE, 'hp_description' );
		$this->assertSame( 'Updated', $val );
	}

	public function test_delete_invalidates_object_cache(): void {
		WPDO_Zone_Cold::set( 502, self::POST_TYPE, 'hp_description', 'Will be deleted' );

		// Warm the cache.
		WPDO_Zone_Cold::get( 502, self::POST_TYPE, 'hp_description' );

		// Delete — must clear cache.
		WPDO_Zone_Cold::delete( 502, self::POST_TYPE );
		$this->assertFalse( wp_cache_get( 'cold_502', 'wpdo_cold_itest' ) );
	}

	// ── isolation ─────────────────────────────────────────────────────────────

	public function test_different_post_ids_are_independent(): void {
		WPDO_Zone_Cold::set( 600, self::POST_TYPE, 'hp_description', 'Post 600' );
		WPDO_Zone_Cold::set( 601, self::POST_TYPE, 'hp_description', 'Post 601' );

		$this->assertSame( 'Post 600', WPDO_Zone_Cold::get( 600, self::POST_TYPE, 'hp_description' ) );
		$this->assertSame( 'Post 601', WPDO_Zone_Cold::get( 601, self::POST_TYPE, 'hp_description' ) );
	}
}