/*
 * 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.reports.business;

import static org.mifos.reports.util.helpers.ReportUtils.reportDatePattern;

import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale;

import javax.servlet.http.HttpServletRequest;

import org.apache.commons.validator.DateValidator;
import org.mifos.framework.servlet.ModifiableParameterServletRequest;
import org.mifos.framework.util.helpers.NumberUtils;
import org.mifos.framework.util.helpers.ServletUtils;
import org.mifos.platform.validations.Errors;
import org.mifos.reports.util.helpers.ReportValidationConstants;

public abstract class AbstractReportParameterForm implements ReportParameterForm {

    public static final SimpleDateFormat REPORT_DATE_PARAM_FORMAT = new SimpleDateFormat("MM/dd/yyyy hh:mm:ss a",new Locale("en", "GB"));

    public abstract String[] getAllFormParameterNames();

    protected void addErrorIfInvalid(Errors errors, String input, Integer invalidValue, String fieldName,
            String errorCode) {
        if (!NumberUtils.isDigits(input) || invalidValue.equals(Integer.valueOf(input))) {
            errors.addError(fieldName, errorCode);
        }
    }

    protected void addErrorIfInvalid(Errors errors, String meetingDate, Date notAvailableDate, String fieldName,
            String errorCode) {
        Date date = parseDate(meetingDate, REPORT_DATE_PARAM_FORMAT);
        if (notAvailableDate.equals(date)) {
            errors.addError(fieldName, errorCode);
        }
    }

    protected Date parseDate(String dateParam, DateFormat dateFormat) {
        Date date = null;
        try {
            date = dateFormat.parse(dateParam);
        } catch (ParseException e) {
        }
        return date;
    }

    protected void removeRequestParams(ModifiableParameterServletRequest modifiedRequest, Errors errors) {
        for (String reportParam : getAllFormParameterNames()) {
            if (errors.getFieldError(reportParam) != null) {
                modifiedRequest.removeParameter(reportParam);
            }
        }
    }

    protected void addErrorIfInvalidRunDate(Errors errors, String runDate, String fieldName, String errorCode) {
        if (!DateValidator.getInstance().isValid(runDate, reportDatePattern(), false)) {
            errors.addError(fieldName, errorCode);
        }
    }

    protected static String extractBranchId(HttpServletRequest request) {
        return ServletUtils.getParameter(request, ReportValidationConstants.BRANCH_ID_PARAM);
    }
}