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package org.opentripplanner.util;

import com.google.common.collect.ArrayListMultimap;
import com.google.common.collect.ListMultimap;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Locale;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.opentripplanner.openstreetmap.model.OSMWithTags;

/**
 * This is used to localize strings for which localization are known beforehand.
 * Those are local names for:
 * unanamedStreet, corner of x and y, path, bike_path etc.
 *
 * Translations are in src/main/resources/WayProperties_lang.properties and internals_lang.properties
 *
 * locale is set in request.
 *
 * @author mabu
 */
public class LocalizedString implements I18NString, Serializable {
    private static final Pattern patternMatcher = Pattern.compile("\\{(.*?)\\}");
    
    /**
     * Map which key has which tagNames. Used only when building graph.
     */
    private transient static ListMultimap key_tag_names;
    
    static {
        key_tag_names = ArrayListMultimap.create();
    }
    //Key which specifies translation
    private String key;
    //Values with which tagNames are replaced in translations.
    private String[] params;

    /**
     * Creates String which can be localized
     * @param key key of translation for this way set in {@link org.opentripplanner.graph_builder.module.osm.DefaultWayPropertySetSource} and translations read from from properties Files
     * @param params Values with which tagNames are replaced in translations.
     */
    public LocalizedString(String key, String[] params) {
        this.key = key;
        this.params = params;
    }

    /**
     * Creates String which can be localized
     * 
     * Uses {@link #getTagNames() } to get which tag values are needed for this key.
     * For each of this tag names tag value is read from OSM way.
     * If tag value is missing it is added as empty string.
     * 
     * For example. If key platform has key {ref} current value of tag ref in way is saved to be used in localizations.
     * It currently assumes that tag exists in way. (otherwise this namer wouldn't be used)
     * 
     * @param key key of translation for this way set in {@link org.opentripplanner.graph_builder.module.osm.DefaultWayPropertySetSource} and translations read from from properties Files
     * @param way OSM way from which tag values are read
     */
    public LocalizedString(String key, OSMWithTags way) {
        this.key = key;
        List lparams = new ArrayList(4);
        //Which tags do we want from way
        List tag_names = getTagNames();
        if (tag_names != null) {
            for(String tag_name: tag_names) {
                String param = way.getTag(tag_name);
                if (param != null) {
                    lparams.add(param);
                } else {
                    lparams.add("");
                }
            }
        }
        this.params = lparams.toArray(new String[lparams.size()]);
    }
    
    /**
     * Finds wanted tag names in name
     * 
     * It uses English localization for key to get tag names.
     * Tag names have to be enclosed in brackets.
     * 
     * For example "Platform {ref}" ref is way tagname.
     * 
     * 
     * @return tagName
     */
    private List getTagNames() {
        //TODO: after finding all keys for replacements replace strings to normal java strings
        //with https://stackoverflow.com/questions/2286648/named-placeholders-in-string-formatting if it is faster
        //otherwise it's converted only when toString is called
        if( key_tag_names.containsKey(key)) {
            return key_tag_names.get(key);
        }
        List tag_names = new ArrayList(4);
        String english_trans = ResourceBundleSingleton.INSTANCE.localize(this.key, Locale.ENGLISH);

        Matcher matcher = patternMatcher.matcher(english_trans);
        while (matcher.find()) {
            String tag_name = matcher.group(1);
            key_tag_names.put(key, tag_name);
            tag_names.add(tag_name);
        }
        return tag_names;
    }

    @Override
    public boolean equals(Object other){
        return other instanceof LocalizedString &&
                key.equals(((LocalizedString) other).key) &&
                Arrays.equals(params, ((LocalizedString) other).params);
    }

    /**
     * Returns translated string in default locale
     * with tag_names replaced with values
     * 
     * Default locale is defaultLocale from {@link ResourceBundleSingleton}
     * @return 
     */
    @Override
    public String toString() {
        return this.toString(ResourceBundleSingleton.INSTANCE.getDefaultLocale());
    }    

     /**
     * Returns translated string in wanted locale
     * with tag_names replaced with values
     * @return 
     */
    @Override
    public String toString(Locale locale) {
        if (this.key == null) {
            return null;
        }
        //replaces {name}, {ref} etc with %s to be used as parameters
        //in string formatting with values from way tags values
        String translation = ResourceBundleSingleton.INSTANCE.localize(this.key, locale);
        if (this.params != null) {
            translation = patternMatcher.matcher(translation).replaceAll("%s");
            return String.format(translation, (Object[]) params);
        } else {
            return translation;
        }
    }

}