/*
 * java.util.Properties.java modified by Kevin Gaudin to allow usage of enums as keys.
 *
 *  Licensed to the Apache Software Foundation (ASF) under one or more
 *  contributor license agreements.  See the NOTICE file distributed with
 *  this work for additional information regarding copyright ownership.
 *  The ASF licenses this file to You under the Apache License, Version 2.0
 *  (the "License"); you may not use this file except in compliance with
 *  the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */

package org.acra.file;

import android.support.annotation.NonNull;

import org.acra.ACRAConstants;
import org.acra.collector.CrashReportData;
import org.acra.util.IOUtils;
import org.acra.util.JsonUtils;
import org.json.JSONException;
import org.json.JSONObject;

import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;

/**
 * Stores a crash reports data with {@link org.acra.ReportField} enum values as keys.
 * This is basically the source of {@link java.util.Properties} adapted to extend an
 * EnumMap instead of Hashtable and with a few tweaks to avoid losing crazy
 * amounts of android time in the generation of a date comment when storing to
 * file.
 */
public final class CrashReportPersister {

    /**
     * Loads properties from the specified {@code File}.
     *
     * @param file  Report file from which to load the CrashData.
     * @return CrashReportData read from the supplied File.
     * @throws IOException if error occurs during reading from the {@code File}.
     * @throws JSONException if the stream cannot be parsed as a JSON object.
     */
    @NonNull
    public CrashReportData load(@NonNull File file) throws IOException, JSONException {

        final InputStream in = new BufferedInputStream(new FileInputStream(file), ACRAConstants.DEFAULT_BUFFER_SIZE_IN_BYTES);
        try {
            return JsonUtils.toCrashReportData(new JSONObject(IOUtils.streamToString(in)));
        }finally {
            IOUtils.safeClose(in);
        }
    }

    /**
     * Stores the mappings in this Properties to the specified OutputStream,
     * putting the specified comment at the beginning. The output from this
     * method is suitable for being read by the load() method.
     *
     * @param crashData     CrashReportData to save.
     * @param file          File into which to store the CrashReportData.
     * @throws java.io.IOException if the CrashReportData could not be written to the OutputStream.
     */
    public void store(@NonNull CrashReportData crashData, @NonNull File file) throws IOException {
        IOUtils.writeStringToFile(file, crashData.toJSON().toString());
    }
}