using PhihongEv.Lib.Convert;
using PhihongEv.Lib.Model;
using System;
using System.Text;

namespace PhihongEv.Lib
{
    public class ModelName
    {
        public MajorType Type { get; private set; }
        public InputConfig InputConfig { get; private set; }
        public SafetyRegulation SafetyReg { get; private set; }
        public decimal RatedPower { get; private set; }
        public ConnectorType[] ConnectorTypes { get; private set; }
        public NetworkOption Network { get; private set; }
        public Generation Generation { get; private set; }
        public string CustomCode { get; private set; }

        public MajorTypeCategory Type_Cat { get => Type.ToCategory(); }

        private string _modelNameString;
        public string modelNameString
        {
            get => _modelNameString;
            set
            {
                if (TryParse(value, out var result))
                {
                    this.Type = result.Type;
                    this.InputConfig = result.InputConfig;
                    this.SafetyReg = result.SafetyReg;
                    this.RatedPower = result.RatedPower;
                    this.ConnectorTypes = result.ConnectorTypes;
                    this.Network = result.Network;
                    this.Generation = result.Generation;
                    this.CustomCode = result.CustomCode;

                    _modelNameString = value;
                }
            }
        }

        public static bool TryParse(byte[] modeNameByte, out ModelName modelName)
        {
            modelName = null;
            string modelNameString;
            try
            {
                modelNameString = Encoding.UTF8.GetString(modeNameByte,0,modeNameByte.Length);
            }
            catch
            {
                return false;
            }

            if (modelNameString.Length != 14)
                return false;
            return TryParse(modelNameString, out modelName);
        }

        public static bool TryParse(string modeNameString, out ModelName modelName)
        {
            modelName = null;
            ModelName model = new ModelName();

            if (modeNameString == null || modeNameString.Length != 14)
                return false;
            var typeString = modeNameString.Substring(0, 2);
            model.Type = typeString.ToMajorType();
            if (model.Type == null)
                return false;

            var inputConfigChr = modeNameString.Substring(2,1);
            model.InputConfig = inputConfigChr.ToInputConfig();
            if (model.InputConfig == null)
                return false;

            var safeRegChr = modeNameString.Substring(3,1);
            model.SafetyReg = safeRegChr.ToSafetyRegulation();
            if (model.SafetyReg == null)
                return false;

            var ratedPowerStr = modeNameString.Substring(4, 3);
            model.RatedPower = GetRatedPowerFromStr(ratedPowerStr);

            model.ConnectorTypes = new ConnectorType[3];
            var connectorListStr = modeNameString.Substring(7, 3);
            /*
            model.ConnectorTypes.Add(ConnectorType.CHadeMO);
            model.ConnectorTypes.Add(ConnectorType.CCS);
            model.ConnectorTypes.Add(ConnectorType.IEC);
            */
            for (int index = 0; index < 3; index++)
            {
                var connectorStr = connectorListStr.Substring(index,1);

                model.ConnectorTypes[index] = connectorStr.ToConnectorType();

                if (model.ConnectorTypes[index] == null)
                    return false;
            }

            var networkOpChr = modeNameString.Substring(10,1);
            model.Network = networkOpChr.ToNetworkOption();
            if (model.Network == null)
            {
                return false;
            }    

            var genStr = modeNameString.Substring(11, 1);
            model.Generation = genStr.ToGeneration();
            if (model.Generation == null)
            {
                return false;
            }

            model.CustomCode = modeNameString.Substring(12, 2);
            model._modelNameString = modeNameString;

            modelName = model;
            return true;
        }

        public override string ToString()
        {
            return modelNameString;
        }

        public int GetConnectorViewIndex(int arrayIndex)
        {
            if (arrayIndex < 0 || arrayIndex > 3)
            {
                throw new Exception("connector Array index out of range");
            }

            //assume same index from start
            int viewIndex = arrayIndex;
            while (arrayIndex >= 0)
            {
                arrayIndex--;
                //for those none connector before index, view index - 1
                if (
                    arrayIndex >= 0 &&
                    ConnectorTypes[arrayIndex] == ConnectorType.None)
                {
                    viewIndex--;
                }
            }
            return viewIndex;
        }

        public int GetConnectorArrayIndex(int viewIndex)
        {
            if (viewIndex < 0 || viewIndex > 3)
            {
                throw new Exception("connector Array index out of range");
            }

            int arrayIndex = 0;
            while (viewIndex >= 0)
            {
                //find next not non connector
                while (ConnectorTypes[arrayIndex] == ConnectorType.None)
                {
                    arrayIndex++;
                }
                //find connector, match and find next
                viewIndex--;
            }
            return arrayIndex;
        }

        private static decimal GetRatedPowerFromStr(string fromStr)
        {
            if (!int.TryParse(fromStr, out int ratedPowerNum) &&
                ratedPowerNum > 0)
                return -1;
            decimal realnum = (decimal)ratedPowerNum / 10;
            var exp = ratedPowerNum % 10;
            return (decimal)(realnum * (10 ^ exp));
        }
    }
}