namespace Inspectron.Epson.PrintServer.Printers.Utils.InvoiceReceipt;

public class ReceiptConverter
{
    private readonly int _lineWidth;
    private readonly int _bigFontLineWidth;

    public ReceiptConverter(int lineWidth = 42, int bigFontLineWidth = 21)
    {
        _lineWidth = lineWidth;
        _bigFontLineWidth = bigFontLineWidth;
    }

    public List<PrintCommand> ConvertToPrintCommands(InvoiceReceipt invoiceReceipt)
    {
        var commands = new List<PrintCommand>();

        // Header - Company info
        commands.Add(new PrintCommand(Center(invoiceReceipt.CompanyName, false)));
        commands.Add(new PrintCommand(Center(invoiceReceipt.Address1, false)));
        commands.Add(new PrintCommand(Center(invoiceReceipt.Address2, false)));
        commands.Add(new PrintCommand(Center(invoiceReceipt.Phone, false)));
        commands.Add(new PrintCommand(""));
        commands.Add(new PrintCommand(""));

        // InvoiceReceipt info
        string receiptLine = $"Rechnung Nr. {invoiceReceipt.ReceiptNumber}".PadRight(_lineWidth/2)+$"{invoiceReceipt.DateTime:HH:mm dd.MM.yyyy}".PadLeft(_lineWidth/2);
        commands.Add(new PrintCommand(receiptLine,isBold:true));
        commands.Add(new PrintCommand($"Guests: {invoiceReceipt.Guests}"));
        commands.Add(new PrintCommand(""));

        // Items
        foreach (var item in invoiceReceipt.Items)
        {
            string quantityDesc = $"{item.Quantity}x {item.Description}";
            string prices = $"{item.UnitPrice:F2}"+$"{item.TotalPrice:F2}".PadLeft(7)+$" {item.TaxCategory}";

            // Calculate spacing to align prices to the right
            int spacesNeeded = _lineWidth - quantityDesc.Length - prices.Length;
            if (spacesNeeded < 1) spacesNeeded = 1;

            string itemLine = quantityDesc + new string(' ', spacesNeeded) + prices;
            commands.Add(new PrintCommand(itemLine));

            // SubItems
            if (item.SubItems != null)
            {
                foreach (var subItem in item.SubItems)
                {
                    commands.Add(new PrintCommand($"  - {subItem}"));
                }
            }
        }

        commands.Add(new PrintCommand(""));
        commands.Add(new PrintCommand("---------".PadLeft(_lineWidth)));
        commands.Add(new PrintCommand(""));

        // Total
        string totalLine = $"Summe:  {invoiceReceipt.Total:F2} {invoiceReceipt.Currency}";
        commands.Add(new PrintCommand(Center(totalLine, true), true, true));

        return commands;
    }

    private string Center(string text, bool isBigFont)
    {
        int effectiveLineWidth = isBigFont ? _bigFontLineWidth : _lineWidth;

        if (string.IsNullOrEmpty(text) || text.Length >= effectiveLineWidth)
            return text;

        int totalPadding = effectiveLineWidth - text.Length;
        int leftPadding = totalPadding / 2;

        return new string(' ', leftPadding) + text;
    }
}