/*

 * 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

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 */

import  java.io.BufferedWriter;

import  java.io.File;

import  java.io.FileWriter;

import  java.io.IOException;

import  java.util.HashMap;

import  java.util.List;

import  java.util.Map;

import  java.util.Set;

import  java.util.SortedMap;

import  java.util.TreeMap;

import  java.util.TreeSet;

/**

 * <code>Simple</code> generates TimeZoneData, which had been used as internal

 * data of TimeZone before J2SDK1.3.

 * Since J2SDK1.4 doesn't need TimeZoneData, this class is for maintenance

 * of old JDK release.

 */

class Simple extends BackEnd {

    /**

     * Zone records which are applied for given year.

     */

    private static Map<String,ZoneRec> lastZoneRecs = new HashMap<>();

    /**

     * Rule records which are applied for given year.

     */

    private static Map<String,List<RuleRec>> lastRules = new TreeMap<>();

    /**

     * zone IDs sorted by their GMT offsets. If zone's GMT

     * offset will change in the future, its last known offset is

     * used.

     */

    private SortedMap<Integer, Set<String>> zonesByOffset = new TreeMap<>();

    /**

     * Sets last Rule records and Zone records for given timezone to

     * each Map.

     *

     * @param tz Timezone object for each zone

     * @return always 0

     */

    int processZoneinfo(Timezone tz) {

        String zonename = tz.getName();

        lastRules.put(zonename, tz.getLastRules());

        lastZoneRecs.put(zonename, tz.getLastZoneRec());

        // Populate zonesByOffset. (Zones that will change their

        // GMT offsets are also added to zonesByOffset here.)

        int lastKnownOffset = tz.getRawOffset();

        Set<String> set = zonesByOffset.get(lastKnownOffset);

        if (set == null) {

            set = new TreeSet<>();

            zonesByOffset.put(lastKnownOffset, set);

        }

        set.add(zonename);

        return 0;

    }

    /**

     * Generates TimeZoneData to output SimpleTimeZone data.

     * @param map Mappings object which is generated by {@link Main#compile}.

     * @return 0 if no error occurred, otherwise 1.

     */

    int generateSrc(Mappings map) {

        try {

            File outD = new File(Main.getOutputDir());

            outD.mkdirs();

            FileWriter fw =

                new FileWriter(new File(outD, "TimeZoneData.java"), false);

            BufferedWriter out = new BufferedWriter(fw);

            out.write("import java.util.SimpleTimeZone;\n\n");

            out.write("    static SimpleTimeZone zones[] = {\n");

            Map<String,String> a = map.getAliases();

            List<Integer> roi = map.getRawOffsetsIndex();

            List<Set<String>> roit = map.getRawOffsetsIndexTable();

            int index = 0;

            for (int offset : zonesByOffset.keySet()) {

                int o = roi.get(index);

                Set<String> set = zonesByOffset.get(offset);

                if (offset == o) {

                    // Merge aliases into zonesByOffset

                    set.addAll(roit.get(index));

                }

                index++;

                for (String key : set) {

                    ZoneRec zrec;

                    String realname;

                    List<RuleRec> stz;

                    if ((realname = a.get(key)) != null) {

                        // if this alias is not targeted, ignore it.

                        if (!Zone.isTargetZone(key)) {

                            continue;

                        }

                        stz = lastRules.get(realname);

                        zrec = lastZoneRecs.get(realname);

                    } else {

                        stz = lastRules.get(key);

                        zrec = lastZoneRecs.get(key);

                    }

                    out.write("\t//--------------------------------------------------------------------\n");

                    String s = Time.toFormedString(offset);

                    out.write("\tnew SimpleTimeZone(" +

                        Time.toFormedString(offset) + ", \"" + key + "\"");

                    if (realname != null) {

                        out.write(" /* " + realname + " */");

                    }

                    if (stz == null) {

                        out.write("),\n");

                    } else {

                        RuleRec rr0 = stz.get(0);

                        RuleRec rr1 = stz.get(1);

                        out.write(",\n\t  " + Month.toString(rr0.getMonthNum()) +

                                  ", " + rr0.getDay().getDayForSimpleTimeZone() + ", " +

                                  rr0.getDay().getDayOfWeekForSimpleTimeZone() + ", " +

                                  Time.toFormedString((int)rr0.getTime().getTime()) + ", " +

                                  rr0.getTime().getTypeForSimpleTimeZone() + ",\n" +

                                  "\t  " + Month.toString(rr1.getMonthNum()) + ", " +

                                  rr1.getDay().getDayForSimpleTimeZone() + ", " +

                                  rr1.getDay().getDayOfWeekForSimpleTimeZone() + ", " +

                                  Time.toFormedString((int)rr1.getTime().getTime())+ ", " +

                                  rr1.getTime().getTypeForSimpleTimeZone() + ",\n" +

                                  "\t  " + Time.toFormedString(rr0.getSave()) + "),\n");

                        out.write("\t// " + rr0.getLine() + "\n");

                        out.write("\t// " + rr1.getLine() + "\n");

                    }

                    String zline = zrec.getLine();

                    if (zline.indexOf("Zone") == -1) {

                        zline = "Zone " + key + "\t" + zline.trim();

                    }

                    out.write("\t// " + zline + "\n");

                }

            }

            out.write("    };\n");

            out.close();

            fw.close();

        } catch(IOException e) {

            Main.panic("IO error: "+e.getMessage());

            return 1;

        }

        return 0;

    }

}