using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Logof_Client;

public class CsvBuilder
{
    private readonly string Header;
    private readonly List<object> Instances;
    private readonly KasAddressList KasAddressList;
    private readonly char Separator;

    public CsvBuilder(string header, List<object> instances, char separator = ',')
    {
        Header = header;
        Instances = instances;
        Separator = separator;
    }

    public CsvBuilder(string header, KasAddressList instances, char separator = ',')
    {
        Header = header;
        KasAddressList = instances;
        Separator = separator;
    }

    public string? BuildKas()
    {
        var result = new StringBuilder();

        result.AppendLine(Header);
        foreach (var l in KasAddressList.KasPersons)
            result.AppendLine(string.Join(Separator, new[]
            {
                EscapeCsvField(l.refsid.ToString()),
                EscapeCsvField(l.anrede),
                EscapeCsvField(l.titel),
                EscapeCsvField(l.vorname),
                EscapeCsvField(l.adel),
                EscapeCsvField(l.name),
                EscapeCsvField(l.namezus),
                EscapeCsvField(l.anredzus),
                EscapeCsvField(l.strasse),
                EscapeCsvField(l.strasse2),
                EscapeCsvField(l.plz),
                EscapeCsvField(l.ort),
                EscapeCsvField(l.land),
                EscapeCsvField(l.pplz),
                EscapeCsvField(l.postfach),
                EscapeCsvField(l.name1),
                EscapeCsvField(l.name2),
                EscapeCsvField(l.name3),
                EscapeCsvField(l.name4),
                EscapeCsvField(l.name5),
                EscapeCsvField(l.funktion),
                EscapeCsvField(l.funktion2),
                EscapeCsvField(l.abteilung),
                EscapeCsvField(l.funktionad)
            }));

        // weitere Cases
        return result.ToString();
    }

    private string EscapeCsvField(string? value)
    {
        var field = value ?? string.Empty;
        var mustQuote = field.Contains(Separator) || field.Contains('"') || field.Contains('\r') || field.Contains('\n');
        if (!mustQuote)
            return field;

        return "\"" + field.Replace("\"", "\"\"") + "\"";
    }
}