using System.Globalization;

namespace InnovEnergy.Lib.Devices.BatteryDeligreen;

using System;
using System.Collections.Generic;

public class TelecommandFrameParser
{
    private static Int32 _currentIndex;
    private const Int32 FrameLength = 232;

    private static readonly Dictionary<String, String> ByteAlarmCodes = new()
    {
        { "00", "Normal, no alarm" },
        { "01", "Alarm that analog quantity reaches the lower limit" },
        { "02", "Alarm that analog quantity reaches the upper limit" },
        { "F0", "Other alarms" }
    };
    
    public BatteryDeligreenAlarmRecord? ParsingTelecommandFrame(String response)
    {
        _currentIndex = 0; // Reset currentIndex to the start

        if (string.IsNullOrEmpty(response) || response.Length < FrameLength)
        {
            Console.WriteLine("Response is too short to contain valid data.");
            Console.WriteLine(" Fixed Length" + FrameLength);
            Console.WriteLine(" response Length" + response.Length);
            return null;
        }

        // Check starting byte
        string startingByte = response.Substring(_currentIndex, 2).ToUpper();
        if (startingByte == "7E")
        {
            // Console.WriteLine($"Starting byte: {startingByte} (Hex)");
        }
        else
        {
            Console.WriteLine($"Incorrect starting byte: {startingByte}");
            return null;
        }

        _currentIndex += 2;

        // Extract firmware version
        var versionBytes = response.Substring(_currentIndex, 4);
        try
        {
            var versionAscii = HexToAscii(versionBytes);
           // Console.WriteLine($"Firmware version: {versionBytes} (Hex), ASCII: {versionAscii}");
        }
        catch (Exception)
        {
            Console.WriteLine($"Failed to decode firmware version from bytes: {versionBytes}");
            return null;
        }

        _currentIndex += 4;

        // Extract and parse other fields
        ParseAndPrintHexField(response, "Device Address", 4);     // this is not added to the Alarm record      
        ParseAndPrintHexField(response, "Device Code (CID1)", 4); // this is not added to the Alarm record          
        ParseAndPrintHexField(response, "Function Code", 4);      // this is not added to the Alarm record      
        ParseAndPrintHexField(response, "Length Code", 8);        // this is not added to the Alarm record  
        ParseAndPrintHexField(response, "Data Flag", 4);          // this is not added to the Alarm record  
        ParseAndPrintHexField(response, "Command Group", 4);      // this is not added to the Alarm record      
        ParseAndPrintHexField(response, "Number of Cells", 4);    // this is not added to the Alarm record      
        
        // Parse Cell Temperature Alarm fields
        var cellAlarmList = ExtractCellAlarm(response);
        
        // Parse Number of Temperature Alarm
        ParseAndPrintHexField(response, "Number of Temperature ", 4); // this is not added to the Alarm record

        // Parse Cell Temperature Alarm fields
        var cellTemperatureAlarm = ExtractCellTempAlarm(response);
        var enviTempAlarm        = ParseAndPrintField(response, "Environment Temperature Alarm"  );
        var powerTempAlarm       = ParseAndPrintField(response, "Power Temperature Alarm"        );       
        var currentAlarm         = ParseAndPrintField(response, "Charge/Discharge Current Alarm" );
        var totalVoltageAlarm    = ParseAndPrintField(response, "Total Battery Voltage Alarm"    );
        
        var batteryAlarmRecord   = new BatteryDeligreenAlarmRecord(cellAlarmList, cellTemperatureAlarm, enviTempAlarm, powerTempAlarm,currentAlarm, totalVoltageAlarm);

        return batteryAlarmRecord;
    }

    private static List<String> ExtractCellTempAlarm(String response)
    {
        var cellTempAlarmList = new List<String>();
        
        var tempCellAlarm = response.Substring(_currentIndex, 4);
        for (var i = 0; i < 4; i++)
        {
            try
            {
                var tempAscii    = HexToAscii(tempCellAlarm);
                var alarmMessage = ByteAlarmCodes.ContainsKey(tempAscii) ? ByteAlarmCodes[tempAscii] : "Unknown alarm code";
                cellTempAlarmList.Add(alarmMessage);
            }
            catch (Exception)
            {
                Console.WriteLine($"Failed to decode Cell Temp Alarm {i + 1} from bytes: {tempCellAlarm}");
            }
            _currentIndex += 4;
        }
     
        return cellTempAlarmList;
    }
    
    
    private static List<String> ExtractCellAlarm(String response)
    {
        var cellAlarmList = new List<String>();

        // Process Alarms for all 16 cells
        for (var i = 0; i < 16; i++)
        {
            var cellAlarm = response.Substring(_currentIndex, 4);
            try
            {
                var alarmAscii = HexToAscii(cellAlarm);
                var alarmMessage = ByteAlarmCodes.ContainsKey(alarmAscii) ? ByteAlarmCodes[alarmAscii] : "Unknown alarm code";
                cellAlarmList.Add(alarmMessage);
                
               // Console.WriteLine($"Cell {i + 1}: Alarm Code {cellAlarm}, Status: {alarmMessage}");
            }
            catch (Exception)
            {
                Console.WriteLine($"Failed to decode Cell Alarm {i + 1} from bytes: {cellAlarm}");
            }
            _currentIndex += 4;
        }
        return cellAlarmList;
    }
    
    private static void ParseAndPrintHexField(String response, String fieldName, Int32 length)
    {
        var hexBytes = response.Substring(_currentIndex, length);
        try
        {
            var asciiValue = HexToAscii(hexBytes);
            var decimalValue = int.Parse(asciiValue, NumberStyles.HexNumber);
            //Console.WriteLine($"{fieldName}: {hexBytes} (Hex), ASCII: {asciiValue}, Decimal: {decimalValue}");
        }
        catch (Exception)
        {
            Console.WriteLine($"Failed to decode {fieldName} from bytes: {hexBytes}");
        }
        _currentIndex += length;
    }
    
    private static String ParseAndPrintField(String response, String fieldName)
    {
        var fieldBytes = response.Substring(_currentIndex, 4);
        var alarmMessage = "Failed to read alarm";
        
        try
        {
            var tempAscii    = HexToAscii(fieldBytes);
            alarmMessage = ByteAlarmCodes.ContainsKey(tempAscii) ? ByteAlarmCodes[tempAscii] : "Unknown alarm code";
        }
        catch (Exception)
        {
            Console.WriteLine($"Failed to decode  : {fieldName}" + " Alarm");
        }
        _currentIndex += 4;
        
        return alarmMessage;
    }

    private static String HexToAscii(String hex)
    {
        var bytes = new Byte[hex.Length / 2];
        for (var i = 0; i < hex.Length; i += 2)
        {
            bytes[i / 2] = byte.Parse(hex.Substring(i, 2), NumberStyles.HexNumber);
        }
        return System.Text.Encoding.ASCII.GetString(bytes);
    }

    private static double HexToDecimal(String hex)
    {
        return int.Parse(hex, NumberStyles.HexNumber);
    }
}