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package info.bliki.wiki.template;

import info.bliki.wiki.model.IWikiModel;

import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.List;

import static java.nio.charset.StandardCharsets.UTF_8;

/**
 * A template parser function for {{localurl: ... }} syntax
 *
 */
public class Localurl extends AbstractTemplateFunction {
    public final static ITemplateFunction CONST = new Localurl();

    @Override
    public String parseFunction(List list, IWikiModel model, char[] src, int beginIndex, int endIndex, boolean isSubst)
            throws UnsupportedEncodingException {
        if (list.size() > 0) {
            String arg0 = isSubst ? list.get(0) : parseTrim(list.get(0), model);
            if (arg0.length() > 0 && list.size() == 1) {
                String result = "/wiki/" + URLEncoder.encode(Character.toUpperCase(arg0.charAt(0)) + "", UTF_8.name())
                        + URLEncoder.encode(arg0.substring(1), UTF_8.name());
                return result;
            }
            StringBuilder builder = new StringBuilder(arg0.length() + 32);
            builder.append("/w/index.php?title=");
            builder.append(URLEncoder.encode(Character.toUpperCase(arg0.charAt(0)) + "", UTF_8.name()));
            builder.append(URLEncoder.encode(arg0.substring(1), UTF_8.name()));
            for (int i = 1; i < list.size(); i++) {
                builder.append("&");
                builder.append(isSubst ? list.get(i) : parseTrim(list.get(i), model));
            }
            return builder.toString();
        }
        return null;
    }
}