package nextrek.minstrek.core;

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

import nextrek.minstrek.utils.BookUtils;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import org.json.JSONTokener;

import android.content.Context;
import android.content.SharedPreferences;
import android.util.Log;

public class FlagList {

    private static final String TAG = "FlagList";
    
    private HashMap<String, Boolean> map = new HashMap<String, Boolean>();
    private boolean hasChanged = false;

    public boolean hasChanged() {
        return this.hasChanged;
    }

    private FlagList() {

    }

    public static FlagList CreateFromJavascript(String jsonKeyToGrab, String eventJavascript) {

        if (eventJavascript == null) {
            return null;
        }

        FlagList result = new FlagList();

        String jsonString = cleanJavascript(eventJavascript);
        JSONTokener jsonTok = new JSONTokener(jsonString);
        try {
            JSONObject json = new JSONObject(jsonTok);
            JSONArray names = json.names();
            for (int scan = 0; scan < names.length(); scan++) {
                String eventName = names.getString(scan);
                JSONObject eventJson = json.getJSONObject(eventName);

                eventName = eventName.toLowerCase(Locale.ITALIAN);

                result.map.put(eventName, eventJson.optBoolean(jsonKeyToGrab));
            }
        } catch (JSONException e) {
            e.printStackTrace();
        }

        return result;
    }

    public static FlagList CreateFromSharedPrefs(String jsonString) {

        if (jsonString == null) {
            return null;
        }

        FlagList result = new FlagList();

        JSONTokener jsonTok = new JSONTokener(jsonString);
        try {
            JSONObject json = new JSONObject(jsonTok);
            JSONArray names = json.names();
            for (int scan = 0; scan < names.length(); scan++) {
                String eventName = names.getString(scan);
                boolean value = json.getBoolean(eventName);

                result.map.put(eventName, value);
            }
        } catch (JSONException e) {
            e.printStackTrace();
        }

        return result;
    }

    private static String cleanJavascript(String js) {

        int start = js.indexOf("{");
        int end = js.indexOf("};");

        return js.substring(start, end + 1);
    }

    public String saveAsJsonString() throws JSONException {
        JSONObject root = new JSONObject(map);
        return root.toString();
    }

    public Boolean change(String eventName, boolean newValue) {
        Boolean oldValue = this.map.get(eventName);

        if ((oldValue == null) || (newValue != oldValue)) {
            this.map.put(eventName, newValue);
            hasChanged |= true;
        }

        return oldValue;
    }

    public boolean isTrue(String eventName) {
        return this.map.get(eventName);
    }

    public void clearChanged() {
        this.hasChanged = false;
    }

    public static FlagList createFromAssetsOrSharedPrefs(Context context, SharedPreferences prefs, String sharedPrefsKey, String javascriptFilename, String javascriptKey) {
        FlagList eventsList = null;
        String eventsData = prefs.getString(sharedPrefsKey, null);
        if (eventsData != null) {
            eventsList = FlagList.CreateFromSharedPrefs(eventsData);
            Log.d(TAG, sharedPrefsKey + "(SP): " + eventsData);
        } else {
            Log.d(TAG, sharedPrefsKey + "(SP): *no savegame*");
            eventsData = BookUtils.readStringFile(context, javascriptFilename);
            if (eventsData != null) {
                eventsList = FlagList.CreateFromJavascript(javascriptKey, eventsData);
                Log.d(TAG, sharedPrefsKey + "(JS): " + eventsData);
            } else {
                Log.w(TAG, sharedPrefsKey + "(JS): *missing data file*");
            }
        }
        return eventsList;
    }

    public void clear() {
        if (map != null) {
            map.clear();
            map = null;
        }
    }
}