package com.babisoft.ReactNativeLocalization;

import android.content.Context;
import android.content.SharedPreferences;

import com.facebook.react.bridge.Callback;
import com.facebook.react.bridge.ReactApplicationContext;
import com.facebook.react.bridge.ReactContextBaseJavaModule;
import com.facebook.react.bridge.ReactMethod;

import java.util.HashMap;
import java.util.Locale;
import java.util.Map;

/**
 * Created by stefano on 20/09/15.
 */
public class ReactNativeLocalization extends ReactContextBaseJavaModule {

    /**
     * Name of the exported variable
     */
    private static final String LANGUAGE = "language";

    public ReactNativeLocalization(ReactApplicationContext reactContext) {
        super(reactContext);
    }

    @Override
    public String getName() {
        return "ReactLocalization";
    }

    /**
     * Return the current language, preferring the value forced by the user and
     * falling back to the device locale.
     */
    private String getCurrentLanguage() {
        String userLocale = getUserLocale();
        if (userLocale != null) {
            return userLocale;
        }

        Locale current = getReactApplicationContext()
                .getResources()
                .getConfiguration()
                .getLocales()
                .get(0);

        String country = current.getCountry();
        if (country == null || country.isEmpty()) {
            return current.getLanguage();
        }
        return current.getLanguage() + "-" + country;
    }

    public String getUserLocale() {
        return getPreferences().getString("locale_override", null);
    }

    /**
     * Export to Javascript the variable language containing the current language
     */
    @Override
    public Map<String, Object> getConstants() {
        final Map<String, Object> constants = new HashMap<>();
        constants.put(LANGUAGE, getCurrentLanguage());
        return constants;
    }

    /**
     * Export a method callable from javascript that returns the current language
     */
    @ReactMethod
    public void getLanguage(Callback callback) {
        callback.invoke(null, getCurrentLanguage());
    }

    /**
     * SharedPreferences
     */
    private SharedPreferences getPreferences() {
        return getReactApplicationContext()
                .getSharedPreferences("react-native", Context.MODE_PRIVATE);
    }
}