using Dlhis.ScheduledTask.SyncSapInfo.Dto;
using System.Text;

namespace Dlhis.ScheduledTask.SyncSapInfo.Comparers;

/// <summary>
/// 人员信息比较器
/// </summary>
public class SapPersonComparer : IEqualityComparer<SapPersonItem>
{
    public bool Equals(SapPersonItem x, SapPersonItem y)
    {
        if (ReferenceEquals(x, y)) return true;
        if (ReferenceEquals(x, null)) return false;
        if (ReferenceEquals(y, null)) return false;

        return x.PERNR == y.PERNR
            && x.WERKS == y.WERKS
            && SubString(x.ORGEH, 10) == SubString(y.ORGEH, 10)
            && SubString(x.NAME, 50) == SubString(y.NAME, 50)
            && SafeParseDate(x.GBDAT) == SafeParseDate(y.GBDAT)
            && SubString(x.ZZ_SFZH, 18) == SubString(y.ZZ_SFZH, 18)
             && SubString(x.ZWORKCODE, 50) == SubString(y.ZWORKCODE, 50)
            && SubString(x.ZMOBILE, 20) == SubString(y.ZMOBILE, 20)
            && x.ZSTATUS == y.ZSTATUS
            && x.KOSTL == y.KOSTL
            && x.ZZ_ZD == y.ZZ_ZD
            && x.Z_ZJ == y.Z_ZJ
            && x.ZRZRQ == y.ZRZRQ
            && SafeParseDate(x.ZLZRQ) == SafeParseDate(y.ZLZRQ)
            && x.STELL == y.STELL
            && x.STELL_NM == y.STELL_NM
            && x.MASSN == y.MASSN
            && x.MNTXT == y.MNTXT
            && (x.ZXUELI ?? string.Empty).Trim() == (y.ZXUELI ?? string.Empty).Trim()
            && (x.ZZ_KLX ?? string.Empty) == (y.ZZ_KLX ?? string.Empty);
    }

    public int GetHashCode(SapPersonItem obj)
    {
        return obj.PERNR.SafeGetHashCode()
            ^ obj.WERKS.SafeGetHashCode()
            ^ SubString(obj.ORGEH, 10).SafeGetHashCode()
            ^ SubString(obj.NAME, 50).SafeGetHashCode()
            ^ SafeParseDate(obj.GBDAT).SafeGetHashCode()
            ^ SubString(obj.ZZ_SFZH, 18).SafeGetHashCode()
            ^ SubString(obj.ZWORKCODE, 50).SafeGetHashCode()
            ^ SubString(obj.ZMOBILE, 20).SafeGetHashCode()
            ^ obj.ZSTATUS.SafeGetHashCode()
            ^ obj.KOSTL.SafeGetHashCode()
            ^ obj.ZZ_ZD.SafeGetHashCode()
            ^ obj.Z_ZJ.SafeGetHashCode()
            ^ obj.ZRZRQ.SafeGetHashCode()
            ^ SafeParseDate(obj.ZLZRQ).SafeGetHashCode()
            ^ obj.STELL.SafeGetHashCode()
            ^ obj.STELL_NM.SafeGetHashCode()
            ^ obj.MASSN.SafeGetHashCode()
            ^ obj.MNTXT.SafeGetHashCode()
            ^ obj.ZXUELI.SafeGetHashCode()
            ^ (obj.ZZ_KLX ?? "").SafeGetHashCode();
    }


    private string SubString(string s, int len)
    {
        if (string.IsNullOrWhiteSpace(s))
        {
            return s?.Trim() ?? "";
        }
        s = s.Trim();
        var bs = Encoding.UTF8.GetBytes(s);
        if (bs.Length <= len)
        {
            return s;
        }
        var bytes = new byte[len];
        Buffer.BlockCopy(bs, 0, bytes, 0, len);
        return Encoding.UTF8.GetString(bytes);
    }


    private DateTime? SafeParseDate(string str)
    {
        if (str == "0000-00-00" || str == "0001-01-01" || str == "1900-01-01")
            return null;

        if (DateTime.TryParse(str, out var d))
        {
            return d;
        }
        return null;
    }
}