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package Torello.Java;

import java.util.function.Function;

class IterableCSV
{
    static String toCSV1(Iterable<?> i, boolean trim, boolean printNulls, Integer maxLength)
    {
        StringBuilder   sb      = new StringBuilder();
        boolean         first   = true;

        if (trim && printNulls)

            for (Object o : i)
            {
                if (o == null) o = "null";

                sb.append((first ? "" : ", ") + o.toString().trim());
                first = false;
            }

        else if (trim && (! printNulls))

            for (Object o : i)
            {
                sb.append((first ? "" : ", ") + o.toString().trim());
                first = false;
            }

        else if ((! trim) && printNulls)

            for (Object o : i)
            {
                if (o == null) o = "null";
    
                sb.append((first ? "" : ", ") + o.toString());
                first = false;
            }

        else // !trim !printNulls

            for (Object o : i)
            {
                sb.append((first ? "" : ", ") + o.toString());
                first = false;
            }

        if ((maxLength != null) && (sb.length() > maxLength.intValue()))
        {
            sb.setLength(maxLength - 4);
            sb.append(" ...");

            return sb.toString();
        }

        return sb.toString();
    }

    static <T> String toCSV2
        (Iterable<T> i, Function<? super T, String> toString, boolean printNulls, Integer maxLength)
    {
        StringBuilder   sb      = new StringBuilder();
        boolean         first   = true;

        if (printNulls)

            for (T t : i)
            {
                sb.append((first ? "" : ", ") + toString.apply(t));
                first = false;
            }

        else

            for (T t : i)
                if (t != null)
                {
                    sb.append((first ? "" : ", ") + toString.apply(t));
                    first = false;
                }

        if ((maxLength != null) && (sb.length() > maxLength.intValue()))
        {
            sb.setLength(maxLength - 4);
            sb.append(" ...");

            return sb.toString();
        }

        return sb.toString();
    }
}