package com.dougkeen.bart.data;

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.util.ArrayList;
import java.util.List;

import org.apache.commons.io.IOUtils;

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

import com.dougkeen.bart.BartRunnerApplication;
import com.dougkeen.bart.model.StationPair;
import com.fasterxml.jackson.core.type.TypeReference;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.googlecode.androidannotations.annotations.EBean;

@EBean
public class FavoritesPersistence {
	private static final String TAG = "FavoritesPersistence";

	private final ObjectMapper objectMapper = new ObjectMapper();

	private BartRunnerApplication app;

	public FavoritesPersistence(Context context) {
		app = (BartRunnerApplication) context.getApplicationContext();
	}

	public void persist(List<StationPair> favorites) {
		FileOutputStream outputStream = null;
		try {
			outputStream = app
					.openFileOutput("favorites", Context.MODE_PRIVATE);
			objectMapper.writeValue(outputStream, favorites);
		} catch (Exception e) {
			Log.e(TAG, "Could not write favorites file", e);
		} finally {
			IOUtils.closeQuietly(outputStream);
		}
	}

	public List<StationPair> restore() {
		for (String file : app.fileList()) {
			if ("favorites".equals(file)) {
				FileInputStream inputStream = null;
				try {
					inputStream = app.openFileInput("favorites");
					return objectMapper.readValue(inputStream,
							new TypeReference<ArrayList<StationPair>>() {
							});
				} catch (Exception e) {
					Log.e(TAG, "Could not read favorites file", e);
				} finally {
					IOUtils.closeQuietly(inputStream);
				}
			}
		}

		return new ArrayList<StationPair>();
	}
}