using System.Globalization;
using InnovEnergy.Lib.Units;
using InnovEnergy.Lib.Utils;
using static InnovEnergy.Lib.Devices.BatteryDeligreen.BatteryDeligreenDataRecord;
using static InnovEnergy.Lib.Devices.BatteryDeligreen.Temperatures;

namespace InnovEnergy.Lib.Devices.BatteryDeligreen;

public class TelemetryFrameParser
{
   private static Int32 _currentIndex;
   private const  Int32 FrameLenght = 336;

    public BatteryDeligreenDataRecord? ParsingTelemetryFrame(String response)
    {
        _currentIndex = 0;  // Reset currentIndex to the start

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

        // Check starting byte
        var 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);
        var versionAscii = "";
        try
        {
            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 Data record      
        ParseAndPrintHexField(response, "Device Code (CID1)", 4);     // this is not added to the Data record          
        ParseAndPrintHexField(response, "Function Code", 4);          // this is not added to the Data record      
        ParseAndPrintHexField(response, "Length Code", 8);            // this is not added to the Data record  
        ParseAndPrintHexField(response, "Data Flag", 4);              // this is not added to the Data record  
        ParseAndPrintHexField(response, "Command Group", 4);          // this is not added to the Data record      
        ParseAndPrintHexField(response, "Number of Cells", 4);        // this is not added to the Data record   
        
        var cellVoltages = ExtractCellVoltage(response);
        
        // Parse other fields
        ParseAndPrintHexField(response, "Number of Temperature Sensors", 4); // this is not added to the Data record
        var cellTemperature = new List<Double>();

        // Parse cell temperatures
        for (var i = 1; i <= 4; i++)
        {
            cellTemperature.Add(ParseAndPrintTemperatureField(response, $"Cell Temperature {i}"));
        }
        
        // Parse other temperature and battery information
        var environmentTemp     = ParseAndPrintTemperatureField(response, "Environment Temperature");
        var powerTemp           = ParseAndPrintTemperatureField(response, "Power Temperature");       
        var current             = ParseAndPrintField(response,            "Charge/Discharge Current" , 8, value => value / 100.0, "A");
        var totalBatteryVoltage = ParseAndPrintField(response,            "Total Battery Voltage"    , 8, value => value / 100.0, "V");
        var residualCapacity    = ParseAndPrintField(response,            "Residual Capacity"        , 8, value => value / 100.0, "Ah");
        var customNumber        = ParseAndPrintHexField(response,         "Custom Number"            , 4);
        var batteryCapacity     = ParseAndPrintField(response,            "Battery Capacity"         , 8, value => value / 100.0, "Ah");
        var soc                 = ParseAndPrintField(response,            "SOC"                      , 8, value => value / 10.0, "%");
        var ratedCapacity       = ParseAndPrintField(response,            "Rated Capacity"           , 8, value => value / 100.0, "Ah");
        var numberOfCycle       = ParseAndPrintHexField(response,         "Number of Cycles"         , 8);
        var soh                 = ParseAndPrintField(response,            "SOH"                      , 8, value => value / 10.0, "%");
        var busVoltage          = ParseAndPrintField(response,            "Bus Voltage"              , 8, value => value / 100.0, "V");

        var temperatures = new TemperaturesList(cellTemperature[0], cellTemperature[1], cellTemperature[2],
                                                cellTemperature[3], environmentTemp, powerTemp);

        var batteryRecord = new BatteryDeligreenDataRecord(busVoltage, current, versionAscii, soc, numberOfCycle, batteryCapacity, ratedCapacity,
                                                        totalBatteryVoltage, soh, residualCapacity, cellVoltages, temperatures);

        return batteryRecord;
    }

    private static List<Double> ExtractCellVoltage(String response)
    {
        var cellVoltages = new List<Double>();
        // Process voltages for all 16 cells
        for (var i = 0; i < 16; i++)
        {
            var cellVoltageBytes = response.Substring(_currentIndex, 8);
            try
            {
                var cellVoltageAscii = HexToAscii(cellVoltageBytes);
                var cellVoltageDecimal = HexToDecimal(cellVoltageAscii) / 1000.0;  // cell voltage are divided 1000
                cellVoltages.Add(cellVoltageDecimal);
                // Console.WriteLine($"Voltage of Cell {i + 1}: {cellVoltageBytes} (Hex), ASCII: {cellVoltageAscii}, Voltage: {cellVoltageDecimal:F3} V");
            }
            catch (Exception)
            {
                Console.WriteLine($"Failed to decode Voltage of Cell {i + 1} from bytes: {cellVoltageBytes}");
            }
            _currentIndex += 8;
        }
        return cellVoltages;
    }

    private static UInt16 ParseAndPrintHexField(String response, String fieldName, Int32 length)
    {
        var hexBytes = response.Substring(_currentIndex, length);
        var decimalValue = 0;
        try
        {
            var asciiValue = HexToAscii(hexBytes);
            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;
        return (UInt16)decimalValue;

    }

    private static Double ParseAndPrintTemperatureField(String response, String fieldName)
    {
        var tempBytes = response.Substring(_currentIndex, 8);
        var tempDecimal = 0.0;
        try
        {
            var tempAscii = HexToAscii(tempBytes);
            tempDecimal = (HexToDecimal(tempAscii) - 2731) / 10.0;
             // Console.WriteLine($"{fieldName}: {tempBytes} (Hex), ASCII: {tempAscii}, Temperature: {tempDecimal:F2} °C");
        }
        catch (Exception)
        {
            Console.WriteLine($"Failed to decode {fieldName} from bytes: {tempBytes}");
        }
        _currentIndex += 8;
        return tempDecimal;
    }

    private static Double ParseAndPrintField(String response, String fieldName, Int32 length, Func<Double, Double> conversion, String unit)
    {
        var fieldBytes = response.Substring(_currentIndex, length);
        var value      = 0.0;
        try
        {
            var fieldAscii = HexToAscii(fieldBytes);
            var fieldDouble = 0.0;
            
         
           // Convert from Hex to Integer using Two's Complement logic
           Int32 intValue = Convert.ToInt16(fieldAscii, 16);
           var bitLength = (length/2) * 4; // Each hex digit is 4 bits
           var maxPositiveValue = 1 << (bitLength - 1); // 2^(bitLength-1)

           if (intValue >= maxPositiveValue)
           {
                intValue -= (1 << bitLength); // Apply two's complement conversion
           }

           fieldDouble = conversion(intValue); // Store the converted negative value as string
           
            //Console.WriteLine($"{fieldName}: {fieldBytes} (Hex), ASCII: {fieldAscii}, {fieldName}: {fieldDouble:F3} {unit}");
            value = fieldDouble;
        }
        catch (Exception)
        {
            Console.WriteLine($"Failed to decode {fieldName} from bytes: {fieldBytes}");
        }
        _currentIndex += length;
        return value;
    }

    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);
    }
}