/**
 * Copyright (c) 2018-2024 Linagora
 * 
 * This program/library is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 2.1 of the License, or (at your
 * option) any later version.
 * 
 * This program/library is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
 * for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program/library; If not, see http://www.gnu.org/licenses/
 * for the GNU Lesser General Public License version 2.1.
 */
package org.ow2.petals.binding.rest.utils;

import java.util.ArrayList;
import java.util.List;
import java.util.Objects;
import java.util.StringTokenizer;

import org.ow2.petals.component.framework.api.exception.PEtALSCDKException;
import org.w3c.dom.Element;

/**
 * <p>
 * Build HTTP code(s) from an XML configuration.
 * </p>
 * <p>
 * The HTTP code is expected as an attribute of a XML element.
 * </p>
 * 
 * @author Christophe DENEUX
 */
public class HttpStatusBuilder {

    private HttpStatusBuilder() {
        // Utility class --> No constructor
    }

    /**
     * <p>
     * Build a HTTP code from an XML configuration.
     * </p>
     * <p>
     * The HTTP code is expected as an attribute of a XML element.
     * </p>
     */
    public static int build(final Element ownerElt, final String attrName) throws PEtALSCDKException {
        final String ownerName = ownerElt.getLocalName();
        final String httpCodeStr = ownerElt.getAttribute(attrName);
        if (httpCodeStr == null || httpCodeStr.trim().isEmpty()) {
            throw new PEtALSCDKException(
                    String.format("Attribute '%s' is required on element '%s'", attrName, ownerName));
        } else {
            try {
                return Integer.parseInt(httpCodeStr);
            } catch (final NumberFormatException e) {
                throw new PEtALSCDKException(
                        String.format("The value '%s' of attribute '%s' of element '%s' must be an integer value.",
                                httpCodeStr, attrName, ownerName));
            }
        }
        // TODO: Improve error management when HTTP code is unknown
    }

    /**
     * <p>
     * Build a HTTP code list from an XML configuration.
     * </p>
     * <p>
     * The HTTP code list is expected as an attribute of a XML element where HTTP codes are separated by '|' .
     * </p>
     */
    public static int[] buildCollection(final Element ownerElt, final String attrName) throws PEtALSCDKException {
        final String ownerName = ownerElt.getLocalName();
        final String httpCodesAttrValue = ownerElt.getAttribute(attrName);
        if (httpCodesAttrValue == null || httpCodesAttrValue.trim().isEmpty()) {
            throw new PEtALSCDKException(
                    String.format("Attribute '%s' is required on element '%s'", attrName, ownerName));
        } else {
            final List<Integer> httpCodes = new ArrayList<>();
            final StringTokenizer httpCodesTokenizer = new StringTokenizer(httpCodesAttrValue, "|");
            while (httpCodesTokenizer.hasMoreElements()) {
                final String httpCodeStr = httpCodesTokenizer.nextToken();
                try {
                    httpCodes.add(Integer.parseInt(httpCodeStr));
                } catch (final NumberFormatException e) {
                    throw new PEtALSCDKException(String.format(
                            "The value '%s' of attribute '%s' of element '%s' must contains integer values separated by '|'.",
                            httpCodesAttrValue, attrName, ownerName));
                }
                // TODO: Improve error management when HTTP code is unknown
            }
            return httpCodes.stream().filter(Objects::nonNull).mapToInt(i -> i).toArray();
        }
    }

}