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/**
 * Copyright (C) 2011 Ness Computing, Inc.
 *
 * 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.
 */
package com.likeness.mojo.numbers;

import java.io.IOException;
import java.util.List;

import org.apache.commons.lang3.ArrayUtils;
import org.joda.time.DateTime;
import org.joda.time.DateTimeZone;
import org.joda.time.format.DateTimeFormat;
import org.joda.time.format.DateTimeFormatter;

import com.google.common.collect.Lists;
import com.likeness.mojo.numbers.beans.DateDefinition;

public class DateField implements PropertyElement
{
    private final DateDefinition dateDefinition;
    private final ValueProvider valueProvider;

    public static List createDates(final PropertyCache propertyCache, final DateDefinition[] dateDefinitions)
        throws IOException
    {
        final List result = Lists.newArrayList();

        if (!ArrayUtils.isEmpty(dateDefinitions)) {
            for (DateDefinition dateDefinition : dateDefinitions) {
                dateDefinition.check();
                final ValueProvider dateValue = propertyCache.getPropertyValue(dateDefinition);
                final DateField dateField = new DateField(dateDefinition, dateValue);
                result.add(dateField);
            }
        }
        return result;
    }

    public DateField(final DateDefinition dateDefinition, final ValueProvider valueProvider)
    {
        this.dateDefinition = dateDefinition;
        this.valueProvider = valueProvider;
    }

    @Override
    public String getPropertyName()
    {
        return dateDefinition.getId();
    }

    @Override
    public String getPropertyValue()
    {
        final DateTimeZone timeZone = dateDefinition.getTimezone() == null ? DateTimeZone.getDefault() : DateTimeZone.forID(dateDefinition.getTimezone());

        DateTime date = getDateTime(valueProvider.getValue(), timeZone);

        if (date == null && dateDefinition.getValue() != null) {
            date = new DateTime(dateDefinition.getValue(), timeZone);
        }

        if (date == null) {
            date = new DateTime(timeZone);
        }

        final String format = dateDefinition.getFormat();

        if (format == null) {
            return date.toString();
        }
        else {
            final DateTimeFormatter formatter = DateTimeFormat.forPattern(format);
            return formatter.print(date);
        }
    }

    private DateTime getDateTime(final String value, final DateTimeZone timeZone)
    {
        if (value == null) {
            return null;
        }
        try {
            return new DateTime(Long.parseLong(value), timeZone);
        }
        catch (NumberFormatException nfe) {
            return new DateTime(value, timeZone);
        }
    }

    @Override
    public boolean isExport()
    {
        return dateDefinition.isExport();
    }

    @Override
    public String toString()
    {
        return getPropertyValue();
    }
}