using System;

namespace AsbCloudInfrastructure.Services.DailyReport
{
    internal class CellAddress
    {
        const int excelLettersCount = 'Z' - 'A';
        public int Row { get; set; }
        public int Colunm { get; set; }

        public CellAddress(int row, int colunm)
        {
            Row = row;
            Colunm = colunm;
        }

        public static CellAddress operator + (CellAddress a, CellAddress b)
            => new CellAddress(a.Row + b.Row, a.Colunm + b.Colunm);
        public static CellAddress operator - (CellAddress a, CellAddress b)
            => new CellAddress(a.Row - b.Row, a.Colunm - b.Colunm);
        public static bool operator == (CellAddress a, CellAddress b)
            => a.Row == b.Row && a.Colunm == b.Colunm;
        public static bool operator !=(CellAddress a, CellAddress b)
            => !(a == b);

        public static bool TryParse(string cellAddress, out CellAddress parsedAddress)
        {
            if (cellAddress.Length < 2)
            {
                parsedAddress = default;
                return false;
            }

            int row = 0;
            int col = 0;

            for (int i = 0; i < cellAddress.Length; i++)            
                switch (cellAddress[i])
                {
                    case >= '0' and <= '9':
                        row = row * 10 + cellAddress[i] - '0';
                        break;
                    case >= 'A' and <= 'Z':
                        col = col * excelLettersCount + cellAddress[i] - 'A';
                        break;
                    case >= 'a' and <= 'z':
                        col = col * excelLettersCount + cellAddress[i] - 'a';
                        break;
                    default:                        
                        parsedAddress = default;
                        return false;
                }
            parsedAddress = new CellAddress(row, col);
            return true;
        }

        public string ToStringA1()
        {
            string letter = "";

            while (Colunm > 0)
            {
                int modulo = (Colunm - 1) % excelLettersCount;
                letter = Convert.ToChar('A' + modulo) + letter;
                Colunm = (Colunm - modulo) / excelLettersCount;
            }

            return letter + Row;
        }

        public override bool Equals(object obj)
        {
            if (ReferenceEquals(this, obj))
            {
                return true;
            }

            if (obj is null)
            {
                return false;
            }

            if (obj is CellAddress address)
                return this == address;

            return false;
        }

        public override int GetHashCode()
            => base.GetHashCode();        
    }
}