package org.wikipedia.language;
import android.content.Context;
import android.content.res.Resources;
import android.support.annotation.ArrayRes;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.text.TextUtils;
import org.wikipedia.R;
import java.lang.ref.SoftReference;
import java.util.Arrays;
import java.util.List;
import java.util.Locale;
/** Immutable look up table for all app supported languages. All article languages may not be
* present in this table as it is statically bundled with the app. */
public class AppLanguageLookUpTable {
public static final String SIMPLIFIED_CHINESE_LANGUAGE_CODE = "zh-hans";
public static final String TRADITIONAL_CHINESE_LANGUAGE_CODE = "zh-hant";
public static final String NORWEGIAN_LEGACY_LANGUAGE_CODE = "no";
public static final String NORWEGIAN_BOKMAL_LANGUAGE_CODE = "nb";
public static final String FALLBACK_LANGUAGE_CODE = "en"; // Must exist in preference_language_keys.
@NonNull private final Resources resources;
// Language codes for all app supported languages in fixed order. The special code representing
// the dynamic system language is null.
@NonNull private SoftReference<List<String>> codesRef = new SoftReference<>(null);
// English names for all app supported languages in fixed order.
@NonNull private SoftReference<List<String>> canonicalNamesRef = new SoftReference<>(null);
// Native names for all app supported languages in fixed order.
@NonNull private SoftReference<List<String>> localizedNamesRef = new SoftReference<>(null);
public AppLanguageLookUpTable(@NonNull Context context) {
resources = context.getResources();
}
/**
* @return Nonnull immutable list. The special code representing the dynamic system language is
* null.
*/
@NonNull
public List<String> getCodes() {
List<String> codes = codesRef.get();
if (codes == null) {
codes = getStringList(R.array.preference_language_keys);
codesRef = new SoftReference<>(codes);
}
return codes;
}
@Nullable
public String getCanonicalName(@Nullable String code) {
String name = defaultIndex(getCanonicalNames(), indexOfCode(code), null);
if (TextUtils.isEmpty(name) && !TextUtils.isEmpty(code)) {
if (code.equals(Locale.CHINA.getLanguage())) {
name = Locale.CHINA.getDisplayName(Locale.ENGLISH);
} else if (code.equals(NORWEGIAN_LEGACY_LANGUAGE_CODE)) {
name = defaultIndex(getCanonicalNames(), indexOfCode(NORWEGIAN_BOKMAL_LANGUAGE_CODE), null);
}
}
return name;
}
@Nullable
public String getLocalizedName(@Nullable String code) {
String name = defaultIndex(getLocalizedNames(), indexOfCode(code), null);
if (TextUtils.isEmpty(name) && !TextUtils.isEmpty(code)) {
if (code.equals(Locale.CHINA.getLanguage())) {
name = Locale.CHINA.getDisplayName(Locale.CHINA);
} else if (code.equals(NORWEGIAN_LEGACY_LANGUAGE_CODE)) {
name = defaultIndex(getLocalizedNames(), indexOfCode(NORWEGIAN_BOKMAL_LANGUAGE_CODE), null);
}
}
return name;
}
private List<String> getCanonicalNames() {
List<String> names = canonicalNamesRef.get();
if (names == null) {
names = getStringList(R.array.preference_language_canonical_names);
canonicalNamesRef = new SoftReference<>(names);
}
return names;
}
private List<String> getLocalizedNames() {
List<String> names = localizedNamesRef.get();
if (names == null) {
names = getStringList(R.array.preference_language_local_names);
localizedNamesRef = new SoftReference<>(names);
}
return names;
}
public boolean isSupportedCode(@Nullable String code) {
return getCodes().contains(code);
}
private <T> T defaultIndex(List<T> list, int index, T defaultValue) {
return inBounds(list, index) ? list.get(index) : defaultValue;
}
/**
* Searches #codes for the specified language code and returns the index for use in
* #canonicalNames and #localizedNames.
*
* @param code The language code to search for. The special code representing the dynamic system
* language is null.
* @return The index of the language code or -1 if the code is not supported.
*/
private int indexOfCode(@Nullable String code) {
return getCodes().indexOf(code);
}
/** @return Nonnull immutable list. */
@NonNull
private List<String> getStringList(int id) {
return Arrays.asList(getStringArray(id));
}
private boolean inBounds(List<?> list, int index) {
return index >= 0 && index < list.size();
}
public String[] getStringArray(@ArrayRes int id) {
return resources.getStringArray(id);
}
}