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/*
 * Copyright 2012-2013 eBay Software Foundation and ios-driver committers
 *
 * Licensed 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.libimobiledevice.ios.driver.binding.services;

import com.sun.jna.ptr.PointerByReference;
import org.libimobiledevice.ios.driver.binding.exceptions.SDKException;
import static org.libimobiledevice.ios.driver.binding.exceptions.SDKErrorCode.throwIfNeeded;
import static org.libimobiledevice.ios.driver.binding.raw.ImobiledeviceSdkLibrary.sdk_idevice_syslog_service_t;
import static org.libimobiledevice.ios.driver.binding.raw.ImobiledeviceSdkLibrary.syslog_service_new;
import static org.libimobiledevice.ios.driver.binding.raw.ImobiledeviceSdkLibrary.syslog_service_start_capture;
import static org.libimobiledevice.ios.driver.binding.raw.ImobiledeviceSdkLibrary.syslog_service_stop_capture;

public class SysLogService {
    private final sdk_idevice_syslog_service_t service;

    private final SyslogMessageListeners handlers = new SyslogMessageListeners();

    private boolean started = false;

    SysLogService(IOSDevice d) throws SDKException {
        PointerByReference ptr = new PointerByReference();

        throwIfNeeded(syslog_service_new(d.getSDKHandle(), ptr));
        service = new sdk_idevice_syslog_service_t(ptr.getValue());
    }

    private void start() throws SDKException {
        if (!started) {
            throwIfNeeded(syslog_service_start_capture(service, handlers, null));
        }
        started = true;
    }

    /**
     * add an additional listener to syslog. Start the service on the first listener.
     *
     * @param listener callback
     *
     * @throws SDKException any issue
     */
    public void addListener(SysLogListener listener) throws SDKException {

        if (!started) {
            start();
        }

        if (listener == null && handlers.size() == 0) {
            listener = new SysLogListener() {

                @Override
                public void onLog(SysLogLine line) {
                    System.out.println(line.toString());
                }
            };
        }
        handlers.add(listener);
    }

    public void remove(SysLogListener listener) {
        handlers.remove(listener);

    }

    public void stop() throws SDKException {
        throwIfNeeded(syslog_service_stop_capture(service));
        started = false;
    }
}