<?php

namespace App\Integrations\Domain\Support;

use Illuminate\Support\Facades\DB;
use Illuminate\Support\Str;

/**
 * Resolves a source (tgs_domain_prod) `users.id` to a local `customers.id`, matched by email.
 * Creates the customer if no match exists — customers.username/type/email_verified_at were
 * added specifically to carry this data (see migration add_admin_zonedns_fields_to_customers_table).
 */
class DomainUserResolver
{
    /** @var array<int, ?int> source user id => customer id */
    private static array $cache = [];

    public function resolve(int $sourceUserId): ?int
    {
        if (array_key_exists($sourceUserId, self::$cache)) {
            return self::$cache[$sourceUserId];
        }

        $user = DB::connection('domain')->table('users')->where('id', $sourceUserId)->first();
        if (! $user) {
            return self::$cache[$sourceUserId] = null;
        }

        $email = strtolower($user->email);
        $customer = DB::table('customers')->where('email', $email)->first();

        if ($customer) {
            DB::table('customers')->where('id', $customer->id)->update([
                'username' => $customer->username ?? $user->username,
                'type' => $user->type,
            ]);

            return self::$cache[$sourceUserId] = $customer->id;
        }

        $customerId = DB::table('customers')->insertGetId([
            'uuid' => (string) Str::uuid(),
            'fullname' => $user->name,
            'username' => $user->username,
            'email' => $email,
            'email_verified_at' => $user->email_verified_at,
            // source hashes are Laravel bcrypt (self-contained, no APP_KEY needed), safe to copy as-is
            'password' => $user->password,
            'type' => $user->type,
            'status' => 1,
            'created_at' => $user->created_at,
            'updated_at' => $user->updated_at,
        ]);

        return self::$cache[$sourceUserId] = $customerId;
    }
}