/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 org.apache.commons.lang3.text;

import static java.util.FormattableFlags.LEFT_JUSTIFY;

import java.util.Formattable;
import java.util.Formatter;

import org.apache.commons.lang3.ObjectUtils;
import org.apache.commons.lang3.StringUtils;
import org.apache.commons.lang3.Validate;

import net.lax1dude.eaglercraft.v1_8.HString;

/**
 * <p>
 * Provides utilities for working with the {@code Formattable} interface.
 * </p>
 *
 * <p>
 * The {@link Formattable} interface provides basic control over formatting when
 * using a {@code Formatter}. It is primarily concerned with numeric precision
 * and padding, and is not designed to allow generalised alternate formats.
 * </p>
 *
 * @since 3.0
 * @!deprecated as of 3.6, use commons-text <a href=
 *             "https://commons.apache.org/proper/commons-text/javadocs/api-release/org/apache/commons/text/FormattableUtils.html">
 *             FormattableUtils</a> instead
 */
//@Deprecated
public class FormattableUtils {

	/**
	 * A format that simply outputs the value as a string.
	 */
	private static final String SIMPLEST_FORMAT = "%s";

	/**
	 * <p>
	 * {@code FormattableUtils} instances should NOT be constructed in standard
	 * programming. Instead, the methods of the class should be invoked statically.
	 * </p>
	 *
	 * <p>
	 * This constructor is public to permit tools that require a JavaBean instance
	 * to operate.
	 * </p>
	 */
	public FormattableUtils() {
	}

	// -----------------------------------------------------------------------
	/**
	 * Gets the default formatted representation of the specified
	 * {@code Formattable}.
	 *
	 * @param formattable the instance to convert to a string, not null
	 * @return the resulting string, not null
	 */
	public static String toString(final Formattable formattable) {
		return HString.format(SIMPLEST_FORMAT, formattable);
	}

	/**
	 * Handles the common {@code Formattable} operations of truncate-pad-append,
	 * with no ellipsis on precision overflow, and padding width underflow with
	 * spaces.
	 *
	 * @param seq       the string to handle, not null
	 * @param formatter the destination formatter, not null
	 * @param flags     the flags for formatting, see {@code Formattable}
	 * @param width     the width of the output, see {@code Formattable}
	 * @param precision the precision of the output, see {@code Formattable}
	 * @return the {@code formatter} instance, not null
	 */
	public static Formatter append(final CharSequence seq, final Formatter formatter, final int flags, final int width,
			final int precision) {
		return append(seq, formatter, flags, width, precision, ' ', null);
	}

	/**
	 * Handles the common {@link Formattable} operations of truncate-pad-append,
	 * with no ellipsis on precision overflow.
	 *
	 * @param seq       the string to handle, not null
	 * @param formatter the destination formatter, not null
	 * @param flags     the flags for formatting, see {@code Formattable}
	 * @param width     the width of the output, see {@code Formattable}
	 * @param precision the precision of the output, see {@code Formattable}
	 * @param padChar   the pad character to use
	 * @return the {@code formatter} instance, not null
	 */
	public static Formatter append(final CharSequence seq, final Formatter formatter, final int flags, final int width,
			final int precision, final char padChar) {
		return append(seq, formatter, flags, width, precision, padChar, null);
	}

	/**
	 * Handles the common {@link Formattable} operations of truncate-pad-append,
	 * padding width underflow with spaces.
	 *
	 * @param seq       the string to handle, not null
	 * @param formatter the destination formatter, not null
	 * @param flags     the flags for formatting, see {@code Formattable}
	 * @param width     the width of the output, see {@code Formattable}
	 * @param precision the precision of the output, see {@code Formattable}
	 * @param ellipsis  the ellipsis to use when precision dictates truncation, null
	 *                  or empty causes a hard truncation
	 * @return the {@code formatter} instance, not null
	 */
	public static Formatter append(final CharSequence seq, final Formatter formatter, final int flags, final int width,
			final int precision, final CharSequence ellipsis) {
		return append(seq, formatter, flags, width, precision, ' ', ellipsis);
	}

	/**
	 * Handles the common {@link Formattable} operations of truncate-pad-append.
	 *
	 * @param seq       the string to handle, not null
	 * @param formatter the destination formatter, not null
	 * @param flags     the flags for formatting, see {@code Formattable}
	 * @param width     the width of the output, see {@code Formattable}
	 * @param precision the precision of the output, see {@code Formattable}
	 * @param padChar   the pad character to use
	 * @param ellipsis  the ellipsis to use when precision dictates truncation, null
	 *                  or empty causes a hard truncation
	 * @return the {@code formatter} instance, not null
	 */
	public static Formatter append(final CharSequence seq, final Formatter formatter, final int flags, final int width,
			final int precision, final char padChar, final CharSequence ellipsis) {
		Validate.isTrue(ellipsis == null || precision < 0 || ellipsis.length() <= precision,
				"Specified ellipsis '%1$s' exceeds precision of %2$s", ellipsis, Integer.valueOf(precision));
		final StringBuilder buf = new StringBuilder(seq);
		if (precision >= 0 && precision < seq.length()) {
			final CharSequence _ellipsis = ObjectUtils.defaultIfNull(ellipsis, StringUtils.EMPTY);
			buf.replace(precision - _ellipsis.length(), seq.length(), _ellipsis.toString());
		}
		final boolean leftJustify = (flags & LEFT_JUSTIFY) == LEFT_JUSTIFY;
		for (int i = buf.length(); i < width; i++) {
			buf.insert(leftJustify ? i : 0, padChar);
		}
		formatter.format(buf.toString());
		return formatter;
	}

}
