منظومة مبيعات متكاملة ومؤتمتة مع WhatsApp

public class WhatsAppInvoiceDispatcher : IInvoiceDispatcher
{
    private readonly HttpClient _httpClient;
    private readonly IPdfGenerator _pdfGenerator;
    private readonly ILogger<WhatsAppInvoiceDispatcher> _logger;

    public async Task<bool> DispatchInvoiceAsync(SalesOrder order)
    {
        try
        {
            // 1. Generate digital PDF receipt with barcode
            var pdfBytes = await _pdfGenerator.GenerateInvoicePdfAsync(order);
            
            // 2. Construct WhatsApp API payload
            var payload = new
            {
                recipient = order.CustomerPhone,
                message = $"مرحباً {order.CustomerName}، شكراً لتعاملك معنا. مرفق فاتورة مشترياتك رقم #{order.InvoiceNumber} بقيمة {order.TotalAmount} د.ل.",
                document = Convert.ToBase64String(pdfBytes),
                fileName = $"Invoice_{order.InvoiceNumber}.pdf"
            };

            // 3. Post to WhatsApp webhook engine
            var response = await _httpClient.PostAsJsonAsync("/api/v1/whatsapp/send-document", payload);
            return response.IsSuccessStatusCode;
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "Failed to dispatch invoice via WhatsApp for order {Id}", order.Id);
            return false;
        }
    }
}