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package cdc.mf.checks;

import java.util.List;
import java.util.function.Function;

import cdc.mf.model.MfCardinality;

public final class FormatUtils {
    private FormatUtils() {
    }

    /**
     * Return a choice among values.
     * 
     * V1
     * 
V1, or V2
     * 
V1, V2, ..., or Vn
     * 
     *
     * @param  The value type.
     * @param values The values.
     * @param toString The value to string converter.
     * @return A string listing values.
     */
    public static  String choose(List values,
                                    Function toString) {
        final StringBuilder builder = new StringBuilder();
        for (int index = 0; index < values.size(); index++) {
            if (index > 0) {
                if (index == values.size() - 1) {
                    builder.append(", or ");
                } else {
                    builder.append(", ");
                }
            }
            builder.append(toString.apply(values.get(index)));
        }
        return builder.toString();
    }

    public static String chooseCardinality(List values) {
        return choose(values, v -> "'" + v.toExpandedString() + "'");
    }

    public static String chooseBound(List bounds) {
        return choose(bounds, v -> "'" + MfCardinality.boundToString(v) + "'");
    }
}