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/*
 * Copyright 2013 serso aka se.solovyev
 *
 * 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.
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 * Contact details
 *
 * Email: [email protected]
 * Site:  http://se.solovyev.org
 */

package org.solovyev.android.prefs;

import android.content.Context;
import android.util.AttributeSet;
import org.solovyev.android.view.DoubleRange;
import org.solovyev.android.view.NumberRange;
import org.solovyev.common.interval.Interval;
import org.solovyev.common.text.Formatter;
import org.solovyev.common.text.NumberIntervalMapper;

import javax.annotation.Nonnull;
import javax.annotation.Nullable;
import java.text.DecimalFormat;

/**
 * User: serso
 * Date: 8/10/12
 * Time: 1:02 AM
 */
public class DoublePickerDialogPreference extends NumberPickerDialogPreference {

	@Nonnull
	private static final Formatter simpleFormatter = new DoubleFormatter(2);

	@Nonnull
	@Override
	protected Double getDefaultStep() {
		return 1d;
	}

	@Nonnull
	@Override
	protected NumberRange createRange(@Nonnull Interval boundaries, @Nonnull Double step, @Nonnull Double selected) {
		return DoubleRange.newInstance(boundaries.getLeftLimit(), boundaries.getRightLimit(), step, selected, simpleFormatter);
	}

	public DoublePickerDialogPreference(Context context, AttributeSet attrs) {
		super(context, attrs, NumberIntervalMapper.of(Double.class));
	}

	private static class DoubleFormatter implements Formatter {

		@Nonnull
		private final DecimalFormat df;

		private DoubleFormatter(int numberOfDecimalDigits) {
			final StringBuilder sb = new StringBuilder("#.#");
			for (int i = 1; i < numberOfDecimalDigits; i++) {
				sb.append("#");
			}

			this.df = new DecimalFormat(sb.toString());
		}

		@Override
		public String formatValue(@Nullable Double value) throws IllegalArgumentException {

			if (value == null) {
				return "null";
			} else {
				synchronized (df) {
					return df.format(value);
				}
			}
		}
	}
}