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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.view;

import org.solovyev.common.text.Formatter;

import javax.annotation.Nonnull;
import javax.annotation.Nullable;

/**
 * User: serso
 * Date: 8/9/12
 * Time: 11:44 PM
 */
public abstract class NumberRange> implements Picker.Range {

	@Nullable
	private Formatter formatter;

	@Nonnull
	private final N min;

	@Nonnull
	private final N max;

	@Nonnull
	private final N step;

	private final int startPosition;

	private int count = -1;

	public NumberRange(@Nonnull N min,
					   @Nonnull N max,
					   @Nonnull N step,
					   int startPosition,
					   @Nullable Formatter formatter) {
		assert min.compareTo(max) <= 0;

		this.min = min;
		this.max = max;
		this.step = step;
		this.startPosition = startPosition;
		this.formatter = formatter;
	}

	@Override
	public int getStartPosition() {
		if (this.startPosition < getCount()) {
			return this.startPosition;
		} else {
			return getCount() - 1;
		}
	}

	@Override
	public int getCount() {
		if (count == -1) {
			count = getCount(min, max, step);
		}
		return count;
	}

	protected abstract int getCount(@Nonnull N min, @Nonnull N max, @Nonnull N step);

	@Nonnull
	@Override
	public String getStringValueAt(int position) {
		int count = getCount();
		if (position < 0 || position >= count) {
			throw new IllegalArgumentException("Position " + position + " must be >= 0 and < " + count + "!");
		}

		final N number = getValueAt(position, min, max, step);
		return formatter == null ? number.toString() : formatter.formatValue(number);
	}

	@Nonnull
	@Override
	public N getValueAt(int position) {
		return getValueAt(position, min, max, step);
	}

	@Nonnull
	protected abstract N getValueAt(int position, @Nonnull N min, @Nonnull N max, @Nonnull N step);
}