<?php

namespace App\Helpers;

use App\Models\Invoice;
use App\Models\Order;
use Illuminate\Support\Str;

class OrderHelper
{
    /**
     * Generate a unique prefixed number.
     *
     * Examples:
     *   generateOrderNumber()        → ORD-A1B2C3D4
     *   generateOrderNumber('INV')   → INV-A1B2C3D4
     *
     * Uniqueness is guaranteed by checking the correct column on each model.
     */
    public static function generateOrderNumber(string $prefix = 'ORD'): string
    {
        do {
            $number = $prefix . '-' . strtoupper(Str::random(8));

            $exists = match ($prefix) {
                'INV' => Invoice::where('invoice_number', $number)->exists(),
                default => Order::where('order_num', $number)->exists(),
            };
        } while ($exists);

        return $number;
    }

    /** Number of months a billing_cycle value represents (used for pricing and expires_at math). */
    public static function cycleToMonths(?string $cycle): int
    {
        return match ($cycle) {
            'monthly' => 1,
            'quarterly' => 3,
            'semi_annually' => 6,
            'annually' => 12,
            'biennially' => 24,
            'triennially' => 36,
            default => 1,
        };
    }
}