<?php

namespace classes;

class subusers_schema_bootstrap
{
    private static bool $initialized = false;

    public static function ensureTables(): void
    {
        if (self::$initialized) {
            return;
        }

        global $db;

        if (!isset($db) || !is_object($db) || !method_exists($db, 'query')) {
            return;
        }

        self::ensureColumn(
            'subuser_grants',
            'assigned_vehicle_id',
            'INT NULL AFTER `subuser`'
        );
        self::ensureIndex(
            'subuser_grants',
            'idx_subuser_grants_assigned_vehicle_id',
            '`assigned_vehicle_id`'
        );
        self::ensureColumn(
            'subusers',
            'phone_verified_at',
            'DATETIME NULL AFTER `phone`'
        );
        self::ensureColumn(
            'subusers',
            'email_verified_at',
            'DATETIME NULL AFTER `email`'
        );
        self::ensureTable(
            'subuser_action_tokens',
            <<<'SQL'
CREATE TABLE IF NOT EXISTS `subuser_action_tokens` (
    `id` BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
    `token_hash` CHAR(64) NOT NULL,
    `purpose` VARCHAR(32) NOT NULL,
    `subuser_id` INT UNSIGNED NOT NULL,
    `grant_id` INT UNSIGNED NULL,
    `customer_number` INT NULL,
    `expires_at` DATETIME NOT NULL,
    `used_at` DATETIME NULL,
    `created_at` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
    PRIMARY KEY (`id`),
    UNIQUE KEY `uniq_subuser_action_token_hash` (`token_hash`),
    KEY `idx_subuser_action_token_subject` (`subuser_id`, `purpose`, `used_at`),
    KEY `idx_subuser_action_token_expiry` (`expires_at`, `used_at`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci
SQL
        );

        self::$initialized = true;
    }

    private static function ensureTable(string $table, string $definition): void
    {
        global $db;

        $table = preg_replace('/[^a-zA-Z0-9_]/', '', $table);
        if ($table === '') {
            return;
        }
        $db->query($definition);
    }

    private static function ensureColumn(string $table, string $column, string $definition): void
    {
        global $db;

        $table = preg_replace('/[^a-zA-Z0-9_]/', '', $table);
        $column = preg_replace('/[^a-zA-Z0-9_]/', '', $column);
        if ($table === '' || $column === '') {
            return;
        }

        $columnSql = $db->escape_string($column);
        $result = $db->query("SHOW COLUMNS FROM `$table` LIKE '$columnSql'");
        if ($result !== false && $result->num_rows > 0) {
            return;
        }

        $db->query("ALTER TABLE `$table` ADD COLUMN `$column` $definition");
    }

    private static function ensureIndex(string $table, string $index, string $columns): void
    {
        global $db;

        $table = preg_replace('/[^a-zA-Z0-9_]/', '', $table);
        $index = preg_replace('/[^a-zA-Z0-9_]/', '', $index);
        if ($table === '' || $index === '') {
            return;
        }

        $indexSql = $db->escape_string($index);
        $result = $db->query("SHOW INDEX FROM `$table` WHERE Key_name = '$indexSql'");
        if ($result !== false && $result->num_rows > 0) {
            return;
        }

        $db->query("ALTER TABLE `$table` ADD INDEX `$index` ($columns)");
    }
}