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/*
 * Copyright (C) 2009.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 3 or
 * version 2 as published by the Free Software Foundation.
 *
 * This program 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 for more details.
 */

package uk.me.parabola.imgfmt.app.mdr;

import java.text.Collator;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

import uk.me.parabola.imgfmt.app.ImgFileWriter;
import uk.me.parabola.imgfmt.app.srt.MultiSortKey;
import uk.me.parabola.imgfmt.app.srt.Sort;
import uk.me.parabola.imgfmt.app.srt.SortKey;

/**
 * Section containing cities.
 *
 * We need: map number, city index in map, offset in LBL, flags
 * and pointer into MDR 15 for the string name.
 *
 * @author Steve Ratcliffe
 */

public class Mdr5 extends MdrMapSection {
        private List<Mdr5Record> allCities = new ArrayList<>();
        private List<Mdr5Record> cities = new ArrayList<>();
        private int maxCityIndex;
        private int localCitySize;

        public Mdr5(MdrConfig config) {
                setConfig(config);
        }

        public void addCity(Mdr5Record record) {
                assert record.getMapIndex() != 0;
                allCities.add(record);
                if (record.getCityIndex() > maxCityIndex)
                        maxCityIndex = record.getCityIndex();
        }

        /**
         * Called after all cities to sort and number them.
         */

        public void preWriteImpl() {
                localCitySize = numberToPointerSize(maxCityIndex + 1);

                List<SortKey<Mdr5Record>> sortKeys = new ArrayList<>(allCities.size());
                Sort sort = getConfig().getSort();
                for (Mdr5Record m : allCities) {
                        if (m.getName() == null)
                                continue;

                        // Sort by city name, region name, country name and map index.
                        SortKey<Mdr5Record> sortKey = sort.createSortKey(m, m.getName());
                        SortKey<Mdr5Record> regionKey = sort.createSortKey(null, m.getRegionName());
                        SortKey<Mdr5Record> countryKey = sort.createSortKey(null, m.getCountryName(), m.getMapIndex());
                        sortKey = new MultiSortKey<>(sortKey, regionKey, countryKey);
                        sortKeys.add(sortKey);
                }
                Collections.sort(sortKeys);

                Collator collator = getConfig().getSort().getCollator();

                int count = 0;
                Mdr5Record lastCity = null;

                // We need a common area to save the mdr20 values, since there can be multiple
                // city records with the same global city index
                int[] mdr20s = new int[sortKeys.size()+1];
                int mdr20count = 0;

                for (SortKey<Mdr5Record> key : sortKeys) {
                        Mdr5Record c = key.getObject();
                        c.setMdr20set(mdr20s);

                        if (!c.isSameByName(collator, lastCity))
                                mdr20count++;
                        c.setMdr20Index(mdr20count);

                        if (c.isSameByMapAndName(collator, lastCity)) {
                                c.setGlobalCityIndex(count);
                        } else {
                                count++;
                                c.setGlobalCityIndex(count);
                                cities.add(c);

                                lastCity = c;
                        }
                }
        }

        public void writeSectData(ImgFileWriter writer) {
                int size20 = getSizes().getMdr20Size();
                Mdr5Record lastCity = null;
                boolean hasString = hasFlag(0x8);
                boolean hasRegion = hasFlag(0x4);
                Collator collator = getConfig().getSort().getCollator();
                for (Mdr5Record city : cities) {
                        int gci = city.getGlobalCityIndex();
                        addIndexPointer(city.getMapIndex(), gci);

                        // Work out if the name is the same as the previous one and set
                        // the flag if so.
                        int flag = 0;
                        int mapIndex = city.getMapIndex();
                        int region = city.getRegionIndex();

                        // Set the no-repeat flag if the name/region is different
                        if (!city.isSameByName(collator, lastCity)) {
                                flag = 0x800000;
                                lastCity = city;
                        }

                        // Write out the record
                        putMapIndex(writer, mapIndex);
                        putLocalCityIndex(writer, city.getCityIndex());
                        writer.put3(flag | city.getLblOffset());
                        if (hasRegion)
                                writer.putChar((char) region);
                        if (hasString)
                                putStringOffset(writer, city.getStringOffset());
                        putN(writer, size20, city.getMdr20());
                }
        }

        /**
         * Put the map city index.  This is the index within the individual map
         * and not the global city index used in mdr11.
         */

        private void putLocalCityIndex(ImgFileWriter writer, int cityIndex) {
                if (localCitySize == 2) // 3 probably not possible in actual maps.
                        writer.putChar((char) cityIndex);
                else
                        writer.put((byte) cityIndex);
        }

        /**
         * Base size of 8, plus enough bytes to represent the map number
         * and the city number.
         * @return The size of a record in this section.
         */

        public int getItemSize() {
                PointerSizes sizes = getSizes();
                int size = sizes.getMapSize()
                                + localCitySize
                                + 3
                                + sizes.getMdr20Size();
                if (hasFlag(0x4))
                        size += 2;
                if (hasFlag(0x8))
                        size += sizes.getStrOffSize();
                return size;
        }

        protected int numberOfItems() {
                return cities.size();
        }

        /**
         * Known structure:
         * bits 0-1: size of local city index - 1 (all values appear to work)
         * bit  3: has region
         * bit  4: has string
         * @return The value to be placed in the header.
         */

        public int getExtraValue() {
                int val = (localCitySize - 1);
                // String offset is only included for a mapsource index.
                if (isForDevice()) {
                        val |= 0x40; // not known, probably refers to mdr17.
                } else {
                        val |= 0x04;  // region
                        val |= 0x08; // string
                }
                val |= 0x10;
                val |= 0x100; // mdr20 present
                return val;
        }

        protected void releaseMemory() {
                allCities = null;
                cities = null;
        }

        /**
         * Get a list of all the cities, including duplicate named ones.
         * @return All cities.
         */

        public List<Mdr5Record> getCities() {
                return Collections.unmodifiableList(allCities);
        }

        public List<Mdr5Record> getSortedCities() {
                return Collections.unmodifiableList(cities);
        }

        public void relabelMaps(Mdr1 maps) {
                relabel(maps, cities);
        }
}