using System;
using System.Collections.Generic;
using System.IO.Ports;
using System.Linq;
using System.Management;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApp1
{
    internal class Program
    {
        static string RandomString(int length)
        {
            var random = new Random();
            const string chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
            var str = new char[length];
            for (int i = 0; i < length; i++)
            {
                str[i] = chars[random.Next(chars.Length)];
            }
            return new string(str);
        }

        static string RandomNumber(int length)
        {
            var random = new Random();
            string number = "";
            for (int i = 0; i < length; i++)
                number += random.Next(0, 10).ToString();
            return number;
        }
        private static string GetVendorId(string portName)
        {
            try
            {
                using (var searcher = new ManagementObjectSearcher(
                    "SELECT * FROM Win32_PnPEntity WHERE Name LIKE '%(" + portName + ")%'"))
                {
                    foreach (var obj in searcher.Get())
                    {
                        string deviceId = obj["PNPDeviceID"]?.ToString();
                        if (deviceId != null)
                        {
                            var vidIndex = deviceId.IndexOf("VID_");
                            if (vidIndex >= 0)
                            {
                                return deviceId.Substring(vidIndex + 4, 4);
                            }
                        }
                    }
                }
            }
            catch (Exception ex)
            {
                Console.WriteLine("Failed to get vendor ID: " + ex.Message);
            }
            return null;
        }
        static void Main(string[] args)
        {
            //Console.WriteLine(GetVendorId("COM3"));
            string[] portNames = SerialPort.GetPortNames();
            string selectedPort = null;
            foreach (string port in portNames)
            {
                string vendorId = GetVendorId(port);

                var knownVendors = new Dictionary<string, string>
                    {
                        { "0483", "STM32" },
                        { "0403", "FTDI" },
                        { "10C4", "Silicon Labs CP210x" },
                        { "067B", "Prolific" },
                        { "1A86", "QinHeng CH340" },
                        { "16C0", "VOTI" }
                    };

                if (vendorId != null && knownVendors.ContainsKey(vendorId.ToUpper()))
                {
                    selectedPort = port;
                    break;
                }
            }
            if (selectedPort == null && portNames.Length > 0)
            {
                selectedPort = portNames[0];
            }

            int baudRate = 921600;     // Replace with appropriate baud rate

            using (SerialPort serialPort = new SerialPort(selectedPort, baudRate, Parity.None, 8, StopBits.One))
            {
                serialPort.Open();

                // Initialize commands dictionary
                var commands = new Dictionary<string, string>
            {
                { "1", "welcome" },
                { "2", "final" },
                { "3", "to_pay" },
                { "4", "success" },
                { "5", "fail" },
                { "6", "cancel" },
                { "7", "billjson" },
                { "8", "newbill" },
                { "0", "exit" }
            };

                Console.WriteLine("Press '0' to Exit.");
                Console.WriteLine("Press '1' for Welcome Message.");
                Console.WriteLine("Press '2' for Final Invoice Message.");
                Console.WriteLine("Press '3' for To Pay QR.");
                Console.WriteLine("Press '4' for Payment Success Message.");
                Console.WriteLine("Press '5' for Payment Fail Message.");
                Console.WriteLine("Press '6' for Payment Cancel Message.");
                Console.WriteLine("Press '7' for Display Bill.");
                Console.WriteLine("Press '8' for Display Single Item.");

                while (true)
                {
                    Console.Write("Enter command number (0-8): ");
                    string choice = Console.ReadLine()?.Trim();

                    if (!commands.ContainsKey(choice))
                    {
                        Console.WriteLine("Invalid choice, try again.");
                        continue;
                    }

                    string commandKey = commands[choice];

                    if (commandKey == "exit")
                    {
                        Console.WriteLine("Exiting...");
                        break;
                    }

                    string command = "";

                    switch (commandKey)
                    {
                        case "welcome":
                            Console.Write("Enter company name: ");
                            string company = Console.ReadLine();
                            command = $"WelcomeScreen**{company}";
                            break;

                        case "final":
                            Console.Write("Enter total: ");
                            string total = Console.ReadLine();
                            Console.Write("Enter discount: ");
                            string discount = Console.ReadLine();
                            Console.Write("Enter tax: ");
                            string tax = Console.ReadLine();
                            Console.Write("Enter grand total: ");
                            string grandTotal = Console.ReadLine();
                            command = $"DisplayTotalScreen**{total}**{discount}**{tax}**{grandTotal}";
                            break;

                        case "to_pay":
                            Console.Write("Enter UPI string: ");
                            string upi = Console.ReadLine();
                            Console.Write("Enter amount: ");
                            string amt = Console.ReadLine();
                            Console.Write("Enter VPA: ");
                            string vpa = Console.ReadLine();
                            command = $"DisplayQRCodeScreen**{upi}**{amt}**{vpa}";
                            break;

                        case "success":
                        case "fail":
                        case "cancel":
                            Console.Write("Enter bank RRN (leave empty to generate): ");
                            string bankRrn = Console.ReadLine();
                            if (string.IsNullOrEmpty(bankRrn)) bankRrn = RandomNumber(10);

                            Console.Write("Enter Order ID (leave empty to generate): ");
                            string orderId = Console.ReadLine();
                            if (string.IsNullOrEmpty(orderId)) orderId = "ORD" + RandomNumber(6);

                            Console.Write("Enter Date (dd-MM-yyyy, leave empty for today): ");
                            string date = Console.ReadLine();
                            if (string.IsNullOrEmpty(date)) date = DateTime.Now.ToString("dd-MM-yyyy");

                            Console.Write("Enter Amount: ");
                            string amt2 = Console.ReadLine();

                            if (commandKey == "success")
                                command = $"DisplaySuccessQRCodeScreen**{bankRrn}**{orderId}**{date}**{amt2}";
                            else if (commandKey == "fail")
                                command = $"DisplayFailQRCodeScreen**{bankRrn}**{orderId}**{date}**{amt2}";
                            else
                                command = $"DisplayCancelQRCodeScreen**{bankRrn}**{orderId}**{date}**{amt2}";
                            break;

                        case "billjson":
                            string json = "{\"storeInfo\": {\"storeName\": \"Test Store\",\"address\": \"123 Test Street\",\"phone\": \"123-456-7890\",\"gstin\": \"TEST123456\"},\"billInfo\": {\"billNo\": \"1\",\"date\": \"2025-02-17\",\"time\": \"12:00\",\"cashier\": \"Test Cashier\"},\"customerInfo\": {\"customerName\": \"John Doe\",\"customerPhone\": \"987-654-3210\"},\"items\": [{\"itemName\": \"Item 1\",\"quantity\": 2,\"pricePerUnit\": 10.0,\"total\": 20.0},{\"itemName\": \"Item 2\",\"quantity\": 1,\"pricePerUnit\": 15.0,\"total\": 15.0},{\"itemName\": \"Item 3\",\"quantity\": 1,\"pricePerUnit\": 15.0,\"total\": 15.0}],\"totals\": {\"subTotal\": 50.0,\"tax\": 5.0,\"discount\": 0.0,\"totalAmount\": 55.0,\"amountPaid\": 55.0,\"paymentMethod\": \"Cash\"},\"footer\": {\"message\": \"Thank you for testing!\",\"website\": \"www.teststore.com\"}}";
                            command = $"billjson**{json}";
                            break;
                        case "newbill":
                            Console.Write("Enter item name: ");
                            string itemName = Console.ReadLine();
                            Console.Write("Enter item code: ");
                            string itemCode = Console.ReadLine();
                            Console.Write("Enter price: ");
                            string price = Console.ReadLine();
                            Console.Write("Enter quantity: ");
                            string qty = Console.ReadLine();
                            Console.Write("Enter unit: ");
                            string unit = Console.ReadLine();
                            Console.Write("Enter subtotal: ");
                            string subtotal = Console.ReadLine();
                            Console.Write("Enter grand total: ");
                            string grandTotal2 = Console.ReadLine();
                            command = $"newbill**{itemName}**{itemCode}**{price}**{qty}**{unit}**{subtotal}**{grandTotal2}";
                            break;
                    }

                    serialPort.WriteLine(command);
                    Console.WriteLine($"Sent: {command}");
                }

                serialPort.Close();
            }
        }
    }
}