<?php

declare(strict_types=1);

namespace LIT\MCP\Tests\Support;

/**
 * In-memory options table as $GLOBALS['wpdb'] that understands the three statements of DesignLock (INSERT IGNORE,
 * conditional UPDATE, DELETE by token). $beforeInsert runs before a lock is inserted (a parallel request).
 */
final class LockTable extends \wpdb
{
    /** @var array<string, string> option_name => option_value */
    public array $rows = [];

    public ?\Closure $beforeInsert = null;

    public static function install(): self
    {
        return $GLOBALS['wpdb'] = new self();
    }

    public function query($sql)
    {
        if (preg_match("/^INSERT IGNORE .* VALUES \('([^']*)', '([^']*)', 'no'\)$/", $sql, $m) === 1) {
            if ($this->beforeInsert !== null) {
                ($this->beforeInsert)();
            }
            if (isset($this->rows[$m[1]])) {
                return 0;
            }
            $this->rows[$m[1]] = $m[2];

            return 1;
        }
        $update = "/^UPDATE .* SET option_value = '([^']*)' WHERE option_name = '([^']*)' AND option_value = '([^']*)'$/";
        if (preg_match($update, $sql, $m) === 1) {
            if (($this->rows[$m[2]] ?? null) !== $m[3]) {
                return 0;
            }
            $this->rows[$m[2]] = $m[1];

            return 1;
        }
        $delete = "/^DELETE FROM .* WHERE option_name = '([^']*)' AND option_value = '([^']*)'$/";
        if (preg_match($delete, $sql, $m) === 1 && ($this->rows[$m[1]] ?? null) === $m[2]) {
            unset($this->rows[$m[1]]);

            return 1;
        }

        return 0;
    }

    public function get_var($sql = null, $x = 0, $y = 0)
    {
        preg_match("/option_name = '([^']*)'/", (string) $sql, $m);

        return $this->rows[$m[1]] ?? null;
    }
}