/*
 * Copyright (c) 2005-2011 Grameen Foundation USA
 * All rights reserved.
 *
 * Licensed 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.
 *
 * See also http://www.apache.org/licenses/LICENSE-2.0.html for an
 * explanation of the license and how it is applied.
 */

package org.mifos.framework.components.tabletag;

import java.util.Locale;
import org.mifos.accounts.loan.util.helpers.RequestConstants;
import org.mifos.application.master.MessageLookup;

/**
 * This class renders the page scroll property of the page like previous and
 * next links.
 */
public class PageScroll {

    /**
     * Function is used to get the required pages on the click of previous or
     * next link.
     *
     * @param current
     *            value of the current page.
     * @param pageSize
     *            no of data in a single page.
     * @param size
     *            size of the data.
     * @param currentFlowKey
     * @param prev
     *            boolean value to find out whether previous is clicked or not.
     * @param next
     *            boolean value to find out whether next is clicked or not.
     * @param jsp
     *            name of the jsp to which this previous or next click will take
     *            you to.
     * @return string next page.
     */
    protected static String getPages(int current, int pageSize, int size, String action, String currentFlowKey,
            Locale locale, String perspective) {
        StringBuilder result = new StringBuilder();
        // to check the onClick status of the prev and next whether that is
        // disable or not
        boolean prev = (current > 1) ? true : false;
        boolean next = ((current * pageSize) >= size) ? false : true;
        // Used to set the number of the start page
        int pageStart = ((current - 1) * pageSize) + 1;

        // Used to set the number of the end page
        int pageEnd = (current * pageSize);
        if (pageEnd > size) {
            pageEnd = size;
        }

        result.append("<tr>");

        /**
         * to check whether previous is clicked or next is clicked and call the
         * respective page according to the click. if previous or next is not
         * allowed then disable the respective link.
         */

        String previousStr = MessageLookup.getLocalizedMessage("Previous");
        String nextStr = MessageLookup.getLocalizedMessage("Next");
        String resultsStr = MessageLookup.getLocalizedMessage("Results");
        resultsStr = resultsStr.replaceFirst("\\{0\\}", new Integer(pageStart).toString());
        resultsStr = resultsStr.replaceFirst("\\{1\\}", new Integer(pageEnd).toString());
        resultsStr = resultsStr.replaceFirst("\\{2\\}", new Integer(size).toString());

        if (prev) {
            result.append("<td width=\"20%\" class=\"fontnormalbold\">").append(
                    getAnchor(action, MessageLookup.getLocalizedMessage("Previous"), "searchPrev", currentFlowKey, current - 1,
                            perspective)).append("</td>");
        } else {
            result.append("<td width=\"20%\" class=\"fontnormalboldgray\">" + previousStr + "</td>");
        }
        result.append("<td width=\"40%\" align=\"center\" class=\"fontnormalbold\">" + resultsStr + " </td>");
        if (next) {
            result.append("<td width=\"20%\" class=\"fontnormalbold\">").append(
                    getAnchor(action, nextStr, "searchNext", currentFlowKey, current + 1, perspective)).append("</td>");
        } else {
            result.append("<td width=\"20%\" align=\"right\" class=\"fontnormalboldgray\">" + nextStr + "</td>");
        }
        result.append("</tr>");
        return result.toString();
    }

    /**
     * Function to get the link property on previous and next.
     *
     * @param hRef
     *            page to which it is going on click.
     * @param text
     *            text to be displayed.
     * @param currentFlowKey
     * @param paramName1
     *            current.
     * @param paramvalue1
     *            current page number.
     * @param paramName2
     *            method name.
     * @param paramvalue2
     *            method value(previous or next).
     * @return
     */
    protected static String getAnchor(String hRef, String text, String method, String currentFlowKey, int current,
            String perspective) {
        StringBuilder result = new StringBuilder();

        result.append("<a href='").append(hRef).append("?method=").append(method).append("¤tFlowKey=").append(
                currentFlowKey).append("¤t=").append(current);

        if (perspective != null) {
            result.append("&").append(RequestConstants.PERSPECTIVE).append("=").append(perspective);
        }

        result.append("'>").append(text).append("</a>");
        return result.toString();
    }
}