/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.    
 */
package org.apache.tuscany.sca.domain.search.impl;

import java.io.Serializable;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

/**
 * 
 * @version $Rev$ $Date$
 */
public class ParentField implements Serializable {

    private static final long serialVersionUID = -2090538050273088026L;

    final private List<ParentFieldElement> elements;

    public ParentField(String parentFieldValue) {
        int length = parentFieldValue.length();

        if (length == 0) {
            this.elements = Collections.emptyList();

            return;

        }

        this.elements = new ArrayList<ParentFieldElement>();

        ParentFieldElement element = null;
        StringBuilder sb = new StringBuilder();

        for (int i = 0; i < length; i++) {
            char c = parentFieldValue.charAt(i);

            if (c == DomainPathAnalyzer.PATH_SEPARATOR || c == DomainPathAnalyzer.PATH_START) {

                if (sb.length() > 0 || element != null) {

                    if (element == null) {
                        element = new ParentFieldElement();
                    }

                    if (element.type == null) {
                        element.type = "";
                    }

                    if (element.uri == null) {
                        element.uri = element.name = sb.toString();

                    } else {
                        element.name = sb.toString();
                    }

                    sb.setLength(0);
                    this.elements.add(element);
                    element = null;

                }

            } else if (c == DomainPathAnalyzer.TYPE_SEPARATOR) {

                if (element == null) {
                    element = new ParentFieldElement();
                }

                element.type = sb.toString();

                sb.setLength(0);

            } else if (c == DomainPathAnalyzer.URI_SEPARATOR) {

                if (element == null) {
                    element = new ParentFieldElement();
                }

                element.uri = sb.toString();

                sb.setLength(0);

            } else {
                sb.append(c);
            }

        }

        if (sb.length() > 0 || element != null) {

            if (element == null) {
                element = new ParentFieldElement();
            }

            if (element.type == null) {
                element.type = "";
            }

            if (element.uri == null) {
                element.uri = element.name = sb.toString();

            } else {
                element.name = sb.toString();
            }

            sb.setLength(0);
            this.elements.add(element);
            element = null;

        }

    }

    public static String getURIPath(ParentField parentField) {
        return getURIPath(parentField, System.getProperty("file.separator"));
    }

    public static String getURIPath(ParentField parentField, String pathSeparator) {
        StringBuilder sb = new StringBuilder();
        sb.append(pathSeparator);
        int elementsCount = parentField.getElementsCount();

        for (int i = 0; i < elementsCount; i++) {
            sb.append(parentField.getElementName(i));
            sb.append(pathSeparator);

        }

        if (sb.length() > pathSeparator.length()) {
            sb.setLength(sb.length() - pathSeparator.length());
        }

        return sb.toString();

    }

    public static int getParentElementsCount(String parent) {
        int length = parent.length();

        if (length == 0) {
            return 0;
        }

        boolean pathSeparatorBefore = true;
        int count = 1;

        for (int i = 0; i < length - 1; i++) {
            char c = parent.charAt(i);

            if (c == DomainPathAnalyzer.PATH_SEPARATOR && !pathSeparatorBefore) {
                pathSeparatorBefore = true;
                count++;

            } else {
                pathSeparatorBefore = false;
            }

        }

        return count;

    }

    public int getElementsCount() {
        return this.elements.size();
    }

    public String getElementType(int index) {
        return this.elements.get(index).type;
    }

    public String getElementURI(int index) {
        return this.elements.get(index).uri;
    }

    public String getElementName(int index) {
        return this.elements.get(index).name;
    }

    final private static class ParentFieldElement {

        String type;

        String uri;

        String name;

    }

}