/*

 * Copyright (c) 2012, 2019, 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,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

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

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

package build.tools.cldrconverter;

import java.util.ArrayList;

import java.util.Arrays;

import java.util.EnumSet;

import java.util.HashMap;

import java.util.Iterator;

import java.util.List;

import java.util.Map;

import java.util.Objects;

import java.util.Optional;

class Bundle {

    static enum Type {

        LOCALENAMES, CURRENCYNAMES, TIMEZONENAMES, CALENDARDATA, FORMATDATA;

        static EnumSet<Type> ALL_TYPES = EnumSet.of(LOCALENAMES,

                                                    CURRENCYNAMES,

                                                    TIMEZONENAMES,

                                                    CALENDARDATA,

                                                    FORMATDATA);

    }

    private final static Map<String, Bundle> bundles = new HashMap<>();

    private final static String[] NUMBER_PATTERN_KEYS = {

        "NumberPatterns/decimal",

        "NumberPatterns/currency",

        "NumberPatterns/percent",

        "NumberPatterns/accounting"

    };

    private final static String[] COMPACT_NUMBER_PATTERN_KEYS = {

            "short.CompactNumberPatterns",

            "long.CompactNumberPatterns"};

    private final static String[] NUMBER_ELEMENT_KEYS = {

        "NumberElements/decimal",

        "NumberElements/group",

        "NumberElements/list",

        "NumberElements/percent",

        "NumberElements/zero",

        "NumberElements/pattern",

        "NumberElements/minus",

        "NumberElements/exponential",

        "NumberElements/permille",

        "NumberElements/infinity",

        "NumberElements/nan"

    };

    private final static String[] TIME_PATTERN_KEYS = {

        "DateTimePatterns/full-time",

        "DateTimePatterns/long-time",

        "DateTimePatterns/medium-time",

        "DateTimePatterns/short-time",

    };

    private final static String[] DATE_PATTERN_KEYS = {

        "DateTimePatterns/full-date",

        "DateTimePatterns/long-date",

        "DateTimePatterns/medium-date",

        "DateTimePatterns/short-date",

    };

    private final static String[] DATETIME_PATTERN_KEYS = {

        "DateTimePatterns/full-dateTime",

        "DateTimePatterns/long-dateTime",

        "DateTimePatterns/medium-dateTime",

        "DateTimePatterns/short-dateTime",

    };

    private final static String[] ERA_KEYS = {

        "long.Eras",

        "Eras",

        "narrow.Eras"

    };

    // Keys for individual time zone names

    private final static String TZ_GEN_LONG_KEY = "timezone.displayname.generic.long";

    private final static String TZ_GEN_SHORT_KEY = "timezone.displayname.generic.short";

    private final static String TZ_STD_LONG_KEY = "timezone.displayname.standard.long";

    private final static String TZ_STD_SHORT_KEY = "timezone.displayname.standard.short";

    private final static String TZ_DST_LONG_KEY = "timezone.displayname.daylight.long";

    private final static String TZ_DST_SHORT_KEY = "timezone.displayname.daylight.short";

    private final static String[] ZONE_NAME_KEYS = {

        TZ_STD_LONG_KEY,

        TZ_STD_SHORT_KEY,

        TZ_DST_LONG_KEY,

        TZ_DST_SHORT_KEY,

        TZ_GEN_LONG_KEY,

        TZ_GEN_SHORT_KEY

    };

    private final String id;

    private final String cldrPath;

    private final EnumSet<Type> bundleTypes;

    private final String currencies;

    private Map<String, Object> targetMap;

    static Bundle getBundle(String id) {

        return bundles.get(id);

    }

    @SuppressWarnings("ConvertToStringSwitch")

    Bundle(String id, String cldrPath, String bundles, String currencies) {

        this.id = id;

        this.cldrPath = cldrPath;

        if ("localenames".equals(bundles)) {

            bundleTypes = EnumSet.of(Type.LOCALENAMES);

        } else if ("currencynames".equals(bundles)) {

            bundleTypes = EnumSet.of(Type.CURRENCYNAMES);

        } else {

            bundleTypes = Type.ALL_TYPES;

        }

        if (currencies == null) {

            currencies = "local";

        }

        this.currencies = currencies;

        addBundle();

    }

    private void addBundle() {

        Bundle.bundles.put(id, this);

    }

    String getID() {

        return id;

    }

    String getJavaID() {

        // Tweak ISO compatibility for bundle generation

        return id.replaceFirst("^he", "iw")

            .replaceFirst("^id", "in")

            .replaceFirst("^yi", "ji");

    }

    boolean isRoot() {

        return "root".equals(id);

    }

    String getCLDRPath() {

        return cldrPath;

    }

    EnumSet<Type> getBundleTypes() {

        return bundleTypes;

    }

    String getCurrencies() {

        return currencies;

    }

    /**

     * Generate a map that contains all the data that should be

     * visible for the bundle's locale

     */

    Map<String, Object> getTargetMap() throws Exception {

        if (targetMap != null) {

            return targetMap;

        }

        String[] cldrBundles = getCLDRPath().split(",");

        // myMap contains resources for id.

        Map<String, Object> myMap = new HashMap<>();

        int index;

        for (index = 0; index < cldrBundles.length; index++) {

            if (cldrBundles[index].equals(id)) {

                myMap.putAll(CLDRConverter.getCLDRBundle(cldrBundles[index]));

                CLDRConverter.handleAliases(myMap);

                break;

            }

        }

        // parentsMap contains resources from id's parents.

        Map<String, Object> parentsMap = new HashMap<>();

        for (int i = cldrBundles.length - 1; i > index; i--) {

            if (!("no".equals(cldrBundles[i]) || cldrBundles[i].startsWith("no_"))) {

                parentsMap.putAll(CLDRConverter.getCLDRBundle(cldrBundles[i]));

                CLDRConverter.handleAliases(parentsMap);

            }

        }

        // Duplicate myMap as parentsMap for "root" so that the

        // fallback works. This is a hack, though.

        if ("root".equals(cldrBundles[0])) {

            assert parentsMap.isEmpty();

            parentsMap.putAll(myMap);

        }

        // merge individual strings into arrays

        // if myMap has any of the NumberPatterns/NumberElements members, create a

        // complete array of patterns/elements.

        @SuppressWarnings("unchecked")

        List<String> scripts = (List<String>) myMap.get("numberingScripts");

        if (scripts != null) {

            for (String script : scripts) {

                myMap.put(script + ".NumberPatterns",

                        createNumberArray(myMap, parentsMap, NUMBER_PATTERN_KEYS, script));

                myMap.put(script + ".NumberElements",

                        createNumberArray(myMap, parentsMap, NUMBER_ELEMENT_KEYS, script));

            }

        }

        for (String k : COMPACT_NUMBER_PATTERN_KEYS) {

            List<String> patterns = (List<String>) myMap.remove(k);

            if (patterns != null) {

                // Replace any null entry with empty strings.

                String[] arrPatterns = patterns.stream()

                        .map(s -> s == null ? "" : s).toArray(String[]::new);

                myMap.put(k, arrPatterns);

            }

        }

        // another hack: parentsMap is not used for date-time resources.

        if ("root".equals(id)) {

            parentsMap = null;

        }

        for (CalendarType calendarType : CalendarType.values()) {

            String calendarPrefix = calendarType.keyElementName();

            // handle multiple inheritance for month and day names

            handleMultipleInheritance(myMap, parentsMap, calendarPrefix + "MonthNames");

            handleMultipleInheritance(myMap, parentsMap, calendarPrefix + "MonthAbbreviations");

            handleMultipleInheritance(myMap, parentsMap, calendarPrefix + "MonthNarrows");

            handleMultipleInheritance(myMap, parentsMap, calendarPrefix + "DayNames");

            handleMultipleInheritance(myMap, parentsMap, calendarPrefix + "DayAbbreviations");

            handleMultipleInheritance(myMap, parentsMap, calendarPrefix + "DayNarrows");

            handleMultipleInheritance(myMap, parentsMap, calendarPrefix + "AmPmMarkers");

            handleMultipleInheritance(myMap, parentsMap, calendarPrefix + "narrow.AmPmMarkers");

            handleMultipleInheritance(myMap, parentsMap, calendarPrefix + "abbreviated.AmPmMarkers");

            handleMultipleInheritance(myMap, parentsMap, calendarPrefix + "QuarterNames");

            handleMultipleInheritance(myMap, parentsMap, calendarPrefix + "QuarterAbbreviations");

            handleMultipleInheritance(myMap, parentsMap, calendarPrefix + "QuarterNarrows");

            adjustEraNames(myMap, calendarType);

            handleDateTimeFormatPatterns(TIME_PATTERN_KEYS, myMap, parentsMap, calendarType, "TimePatterns");

            handleDateTimeFormatPatterns(DATE_PATTERN_KEYS, myMap, parentsMap, calendarType, "DatePatterns");

            handleDateTimeFormatPatterns(DATETIME_PATTERN_KEYS, myMap, parentsMap, calendarType, "DateTimePatterns");

        }

        // First, weed out any empty timezone or metazone names from myMap.

        // Fill in any missing abbreviations if locale is "en".

        for (Iterator<String> it = myMap.keySet().iterator(); it.hasNext();) {

            String key = it.next();

            if (key.startsWith(CLDRConverter.TIMEZONE_ID_PREFIX)

                    || key.startsWith(CLDRConverter.METAZONE_ID_PREFIX)) {

                @SuppressWarnings("unchecked")

                Map<String, String> nameMap = (Map<String, String>) myMap.get(key);

                if (nameMap.isEmpty()) {

                    // Some zones have only exemplarCity, which become empty.

                    // Remove those from the map.

                    it.remove();

                    continue;

                }

                if (id.equals("en")) {

                    fillInJREs(key, nameMap);

                }

            }

        }

        for (Iterator<String> it = myMap.keySet().iterator(); it.hasNext();) {

            String key = it.next();

                if (key.startsWith(CLDRConverter.TIMEZONE_ID_PREFIX)

                    || key.startsWith(CLDRConverter.METAZONE_ID_PREFIX)) {

                @SuppressWarnings("unchecked")

                Map<String, String> nameMap = (Map<String, String>) myMap.get(key);

                // Convert key/value pairs to an array.

                String[] names = new String[ZONE_NAME_KEYS.length];

                int ix = 0;

                for (String nameKey : ZONE_NAME_KEYS) {

                    String name = nameMap.get(nameKey);

                    if (name == null && parentsMap != null) {

                        @SuppressWarnings("unchecked")

                        Map<String, String> parentNames = (Map<String, String>) parentsMap.get(key);

                        if (parentNames != null) {

                            name = parentNames.get(nameKey);

                        }

                    }

                    names[ix++] = name;

                }

                if (hasNulls(names)) {

                    String metaKey = toMetaZoneKey(key);

                    if (metaKey != null) {

                        Object obj = myMap.get(metaKey);

                        if (obj instanceof String[]) {

                            String[] metaNames = (String[]) obj;

                            for (int i = 0; i < names.length; i++) {

                                if (names[i] == null) {

                                    names[i] = metaNames[i];

                                }

                            }

                        } else if (obj instanceof Map) {

                            @SuppressWarnings("unchecked")

                            Map<String, String> m = (Map<String, String>) obj;

                            for (int i = 0; i < names.length; i++) {

                                if (names[i] == null) {

                                    names[i] = m.get(ZONE_NAME_KEYS[i]);

                                }

                            }

                        }

                    }

                }

                // replace the Map with the array

                if (names != null) {

                    myMap.put(key, names);

                } else {

                    it.remove();

                }

            }

        }

        // replace empty era names with parentMap era names

        for (String key : ERA_KEYS) {

            Object value = myMap.get(key);

            if (value != null && value instanceof String[]) {

                String[] eraStrings = (String[]) value;

                for (String eraString : eraStrings) {

                    if (eraString == null || eraString.isEmpty()) {

                        fillInElements(parentsMap, key, value);

                    }

                }

            }

        }

        // Remove all duplicates

        if (Objects.nonNull(parentsMap)) {

            for (Iterator<String> it = myMap.keySet().iterator(); it.hasNext();) {

                String key = it.next();

                if (!key.equals("numberingScripts") && // real body "NumberElements" may differ

                    Objects.deepEquals(parentsMap.get(key), myMap.get(key))) {

                    it.remove();

                }

            }

        }

        targetMap = myMap;

        return myMap;

    }

    private void handleMultipleInheritance(Map<String, Object> map, Map<String, Object> parents, String key) {

        String formatKey = key + "/format";

        Object format = map.get(formatKey);

        if (format != null) {

            map.remove(formatKey);

            map.put(key, format);

            if (fillInElements(parents, formatKey, format)) {

                map.remove(key);

            }

        }

        String standaloneKey = key + "/stand-alone";

        Object standalone = map.get(standaloneKey);

        if (standalone != null) {

            map.remove(standaloneKey);

            String realKey = key;

            if (format != null) {

                realKey = "standalone." + key;

            }

            map.put(realKey, standalone);

            if (fillInElements(parents, standaloneKey, standalone)) {

                map.remove(realKey);

            }

        }

    }

    /**

     * Fills in any empty elements with its parent element. Returns true if the resulting array is

     * identical to its parent array.

     *

     * @param parents

     * @param key

     * @param value

     * @return true if the resulting array is identical to its parent array.

     */

    private boolean fillInElements(Map<String, Object> parents, String key, Object value) {

        if (parents == null) {

            return false;

        }

        if (value instanceof String[]) {

            Object pvalue = parents.get(key);

            if (pvalue != null && pvalue instanceof String[]) {

                String[] strings = (String[]) value;

                String[] pstrings = (String[]) pvalue;

                for (int i = 0; i < strings.length; i++) {

                    if (strings[i] == null || strings[i].length() == 0) {

                        strings[i] = pstrings[i];

                    }

                }

                return Arrays.equals(strings, pstrings);

            }

        }

        return false;

    }

    /*

     * Adjusts String[] for era names because JRE's Calendars use different

     * ERA value indexes in the Buddhist, Japanese Imperial, and Islamic calendars.

     */

    private void adjustEraNames(Map<String, Object> map, CalendarType type) {

        String[][] eraNames = new String[ERA_KEYS.length][];

        String[] realKeys = new String[ERA_KEYS.length];

        int index = 0;

        for (String key : ERA_KEYS) {

            String realKey = type.keyElementName() + key;

            String[] value = (String[]) map.get(realKey);

            if (value != null) {

                switch (type) {

                case GREGORIAN:

                    break;

                case JAPANESE:

                    {

                        String[] newValue = new String[value.length + 1];

                        String[] julianEras = (String[]) map.get(key);

                        if (julianEras != null && julianEras.length >= 2) {

                            newValue[0] = julianEras[1];

                        } else {

                            newValue[0] = "";

                        }

                        System.arraycopy(value, 0, newValue, 1, value.length);

                        value = newValue;

                        // fix up 'Reiwa' era, which can be missing in some locales

                        if (value[value.length - 1] == null) {

                            value[value.length - 1] = (key.startsWith("narrow.") ? "R" : "Reiwa");

                        }

                    }

                    break;

                case BUDDHIST:

                    // Replace the value

                    value = new String[] {"BC", value[0]};

                    break;

                case ISLAMIC:

                    // Replace the value

                    value = new String[] {"", value[0]};

                    break;

                }

                if (!key.equals(realKey)) {

                    map.put(realKey, value);

                    map.put("java.time." + realKey, value);

                }

            }

            realKeys[index] = realKey;

            eraNames[index++] = value;

        }

        for (int i = 0; i < eraNames.length; i++) {

            if (eraNames[i] == null) {

                map.put(realKeys[i], null);

            }

        }

    }

    private void handleDateTimeFormatPatterns(String[] patternKeys, Map<String, Object> myMap, Map<String, Object> parentsMap,

                                              CalendarType calendarType, String name) {

        String calendarPrefix = calendarType.keyElementName();

        for (String k : patternKeys) {

            if (myMap.containsKey(calendarPrefix + k)) {

                int len = patternKeys.length;

                List<String> dateTimePatterns = new ArrayList<>(len);

                List<String> sdfPatterns = new ArrayList<>(len);

                for (int i = 0; i < len; i++) {

                    String key = calendarPrefix + patternKeys[i];

                    String pattern = (String) myMap.remove(key);

                    if (pattern == null) {

                        pattern = (String) parentsMap.remove(key);

                    }

                    if (pattern != null) {

                        // Perform date-time format pattern conversion which is

                        // applicable to both SimpleDateFormat and j.t.f.DateTimeFormatter.

                        // For example, character 'B' is mapped with 'a', as 'B' is not

                        // supported in either SimpleDateFormat or j.t.f.DateTimeFormatter

                        String transPattern = translateDateFormatLetters(calendarType, pattern, this::convertDateTimePatternLetter);

                        dateTimePatterns.add(i, transPattern);

                        // Additionally, perform SDF specific date-time format pattern conversion

                        sdfPatterns.add(i, translateDateFormatLetters(calendarType, transPattern, this::convertSDFLetter));

                    } else {

                        dateTimePatterns.add(i, null);

                        sdfPatterns.add(i, null);

                    }

                }

                // If empty, discard patterns

                if (sdfPatterns.isEmpty()) {