/*

 * Copyright (c) 1999, 2020, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

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 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

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/*

 *

 * (C) Copyright Taligent, Inc. 1996, 1997 - All Rights Reserved

 * (C) Copyright IBM Corp. 1996 - 2002 - All Rights Reserved

 *

 * The original version of this source code and documentation

 * is copyrighted and owned by Taligent, Inc., a wholly-owned

 * subsidiary of IBM. These materials are provided under terms

 * of a License Agreement between Taligent and Sun. This technology

 * is protected by multiple US and International patents.

 *

 * This notice and attribution to Taligent may not be removed.

 * Taligent is a registered trademark of Taligent, Inc.

 */

package sun.util.locale.provider;

import java.text.CompactNumberFormat;

import java.text.DecimalFormat;

import java.text.DecimalFormatSymbols;

import java.text.NumberFormat;

import java.text.spi.NumberFormatProvider;

import java.util.Currency;

import java.util.Locale;

import java.util.Objects;

import java.util.Set;

/**

 * Concrete implementation of the  {@link java.text.spi.NumberFormatProvider

 * NumberFormatProvider} class for the JRE LocaleProviderAdapter.

 *

 * @author Naoto Sato

 * @author Masayoshi Okutsu

 */

public class NumberFormatProviderImpl extends NumberFormatProvider implements AvailableLanguageTags {

    // Constants used by factory methods to specify a style of format.

    private static final int NUMBERSTYLE = 0;

    private static final int CURRENCYSTYLE = 1;

    private static final int PERCENTSTYLE = 2;

    private static final int ACCOUNTINGSTYLE = 3;

    private static final int INTEGERSTYLE = 4;

    private final LocaleProviderAdapter.Type type;

    private final Set<String> langtags;

    public NumberFormatProviderImpl(LocaleProviderAdapter.Type type, Set<String> langtags) {

        this.type = type;

        this.langtags = langtags;

    }

    /**

     * Returns an array of all locales for which this locale service provider

     * can provide localized objects or names.

     *

     * @return An array of all locales for which this locale service provider

     * can provide localized objects or names.

     */

    @Override

    public Locale[] getAvailableLocales() {

        return LocaleProviderAdapter.forType(type).getAvailableLocales();

    }

    @Override

    public boolean isSupportedLocale(Locale locale) {

        return LocaleProviderAdapter.forType(type).isSupportedProviderLocale(locale, langtags);

    }

    /**

     * Returns a new <code>NumberFormat</code> instance which formats

     * monetary values for the specified locale.

     *

     * @param locale the desired locale.

     * @exception NullPointerException if <code>locale</code> is null

     * @exception IllegalArgumentException if <code>locale</code> isn't

     *     one of the locales returned from

     *     {@link java.util.spi.LocaleServiceProvider#getAvailableLocales()

     *     getAvailableLocales()}.

     * @return a currency formatter

     * @see java.text.NumberFormat#getCurrencyInstance(java.util.Locale)

     */

    @Override

    public NumberFormat getCurrencyInstance(Locale locale) {

        return getInstance(locale, CURRENCYSTYLE);

    }

    /**

     * Returns a new <code>NumberFormat</code> instance which formats

     * integer values for the specified locale.

     * The returned number format is configured to

     * round floating point numbers to the nearest integer using

     * half-even rounding (see {@link java.math.RoundingMode#HALF_EVEN HALF_EVEN})

     * for formatting, and to parse only the integer part of

     * an input string (see {@link

     * java.text.NumberFormat#isParseIntegerOnly isParseIntegerOnly}).

     *

     * @param locale the desired locale

     * @exception NullPointerException if <code>locale</code> is null

     * @exception IllegalArgumentException if <code>locale</code> isn't

     *     one of the locales returned from

     *     {@link java.util.spi.LocaleServiceProvider#getAvailableLocales()

     *     getAvailableLocales()}.

     * @return a number format for integer values

     * @see java.text.NumberFormat#getIntegerInstance(java.util.Locale)

     */

    @Override

    public NumberFormat getIntegerInstance(Locale locale) {

        return getInstance(locale, INTEGERSTYLE);

    }

    /**

     * Returns a new general-purpose <code>NumberFormat</code> instance for

     * the specified locale.

     *

     * @param locale the desired locale

     * @exception NullPointerException if <code>locale</code> is null

     * @exception IllegalArgumentException if <code>locale</code> isn't

     *     one of the locales returned from

     *     {@link java.util.spi.LocaleServiceProvider#getAvailableLocales()

     *     getAvailableLocales()}.

     * @return a general-purpose number formatter

     * @see java.text.NumberFormat#getNumberInstance(java.util.Locale)

     */

    @Override

    public NumberFormat getNumberInstance(Locale locale) {

        return getInstance(locale, NUMBERSTYLE);

    }

    /**

     * Returns a new <code>NumberFormat</code> instance which formats

     * percentage values for the specified locale.

     *

     * @param locale the desired locale

     * @exception NullPointerException if <code>locale</code> is null

     * @exception IllegalArgumentException if <code>locale</code> isn't

     *     one of the locales returned from

     *     {@link java.util.spi.LocaleServiceProvider#getAvailableLocales()

     *     getAvailableLocales()}.

     * @return a percent formatter

     * @see java.text.NumberFormat#getPercentInstance(java.util.Locale)

     */

    @Override

    public NumberFormat getPercentInstance(Locale locale) {

        return getInstance(locale, PERCENTSTYLE);

    }

    private NumberFormat getInstance(Locale locale,

                                            int choice) {

        if (locale == null) {

            throw new NullPointerException();

        }

        // Check for region override

        Locale override = locale.getUnicodeLocaleType("nu") == null ?

            CalendarDataUtility.findRegionOverride(locale) :

            locale;

        LocaleProviderAdapter adapter = LocaleProviderAdapter.forType(type);

        String[] numberPatterns = adapter.getLocaleResources(override).getNumberPatterns();

        DecimalFormatSymbols symbols = DecimalFormatSymbols.getInstance(override);

        int entry = (choice == INTEGERSTYLE) ? NUMBERSTYLE : choice;

        if (choice == CURRENCYSTYLE &&

            numberPatterns.length > ACCOUNTINGSTYLE &&

            !numberPatterns[ACCOUNTINGSTYLE].isEmpty() &&

            "account".equalsIgnoreCase(override.getUnicodeLocaleType("cf"))) {

            entry = ACCOUNTINGSTYLE;

        }

        DecimalFormat format = new DecimalFormat(numberPatterns[entry], symbols);

        if (choice == INTEGERSTYLE) {

            format.setMaximumFractionDigits(0);

            format.setDecimalSeparatorAlwaysShown(false);

            format.setParseIntegerOnly(true);

        } else if (choice == CURRENCYSTYLE) {

            adjustForCurrencyDefaultFractionDigits(format, symbols);

        }

        return format;

    }

    /**

     * Adjusts the minimum and maximum fraction digits to values that

     * are reasonable for the currency's default fraction digits.

     */

    private static void adjustForCurrencyDefaultFractionDigits(

            DecimalFormat format, DecimalFormatSymbols symbols) {

        Currency currency = symbols.getCurrency();

        if (currency == null) {

            try {

                currency = Currency.getInstance(symbols.getInternationalCurrencySymbol());

            } catch (IllegalArgumentException e) {

            }

        }

        if (currency != null) {

            int digits = currency.getDefaultFractionDigits();

            if (digits != -1) {

                int oldMinDigits = format.getMinimumFractionDigits();

                // Common patterns are "#.##", "#.00", "#".

                // Try to adjust all of them in a reasonable way.

                if (oldMinDigits == format.getMaximumFractionDigits()) {

                    format.setMinimumFractionDigits(digits);

                    format.setMaximumFractionDigits(digits);

                } else {

                    format.setMinimumFractionDigits(Math.min(digits, oldMinDigits));

                    format.setMaximumFractionDigits(digits);

                }

            }

        }

    }

    /**

     * Returns a new {@code NumberFormat} instance which formats

     * a number in its compact form for the specified

     * {@code locale} and {@code formatStyle}.

     *

     * @param locale the desired locale

     * @param formatStyle the style for formatting a number

     * @throws NullPointerException if {@code locale} or {@code formatStyle}

     *     is {@code null}

     * @throws IllegalArgumentException if {@code locale} isn't

     *     one of the locales returned from

     *     {@link java.util.spi.LocaleServiceProvider#getAvailableLocales()

     *     getAvailableLocales()}.

     * @return a compact number formatter

     *

     * @see java.text.NumberFormat#getCompactNumberInstance(Locale,

     *                      NumberFormat.Style)

     * @since 12

     */

    @Override

    public NumberFormat getCompactNumberInstance(Locale locale,

            NumberFormat.Style formatStyle) {

        Objects.requireNonNull(locale);

        Objects.requireNonNull(formatStyle);

        // Check for region override

        Locale override = locale.getUnicodeLocaleType("nu") == null

                ? CalendarDataUtility.findRegionOverride(locale)

                : locale;

        LocaleProviderAdapter adapter = LocaleProviderAdapter.forType(type);

        LocaleResources resource = adapter.getLocaleResources(override);

        String[] numberPatterns = resource.getNumberPatterns();

        DecimalFormatSymbols symbols = DecimalFormatSymbols.getInstance(override);

        String[] cnPatterns = resource.getCNPatterns(formatStyle);

        // plural rules

        String[] rules = resource.getRules();

        return new CompactNumberFormat(numberPatterns[0],

                symbols, cnPatterns, rules[0]);

    }

    @Override

    public Set<String> getAvailableLanguageTags() {

        return langtags;

    }

}