/*
 * This file is part of Applied Energistics 2.
 * Copyright (c) 2013 - 2015, AlgorithmX2, All rights reserved.
 *
 * Applied Energistics 2 is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Applied Energistics 2 is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with Applied Energistics 2.  If not, see <http://www.gnu.org/licenses/lgpl>.
 */

package appeng.services.version;


import java.io.File;
import java.util.Date;

import javax.annotation.Nonnull;

import com.google.common.base.Preconditions;

import net.minecraftforge.common.config.Configuration;


/**
 * Separate config file to handle the version checker
 */
public final class VersionCheckerConfig
{
	private static final int DEFAULT_INTERVAL_HOURS = 24;
	private static final int MIN_INTERVAL_HOURS = 0;
	private static final int MAX_INTERVAL_HOURS = 7 * 24;

	@Nonnull
	private final Configuration config;

	private final boolean isEnabled;

	@Nonnull
	private final String lastCheck;
	private final int interval;

	@Nonnull
	private final String level;

	private final boolean shouldNotifyPlayer;
	private final boolean shouldPostChangelog;

	/**
	 * @param file requires fully qualified file in which the config is saved
	 */
	public VersionCheckerConfig( @Nonnull final File file )
	{
		Preconditions.checkNotNull( file );
		Preconditions.checkState( !file.isDirectory() );

		this.config = new Configuration( file );

		// initializes default values by caching
		this.isEnabled = this.config.getBoolean( "enabled", "general", true, "If true, the version checker is enabled. Acts as a master switch." );

		this.lastCheck = this.config.getString( "lastCheck", "cache", "0", "The number of milliseconds since January 1, 1970, 00:00:00 GMT of the last successful check." );
		this.interval = this.config.getInt( "interval", "cache", DEFAULT_INTERVAL_HOURS, MIN_INTERVAL_HOURS, MAX_INTERVAL_HOURS, "Waits as many hours, until it checks again." );

		this.level = this.config.getString( "level", "channel", "Beta", "Determines the channel level which should be checked for updates. Can be either Stable, Beta or Alpha." );

		this.shouldNotifyPlayer = this.config.getBoolean( "notify", "client", true, "If true, the player is getting a notification, that a new version is available." );
		this.shouldPostChangelog = this.config.getBoolean( "changelog", "client", true, "If true, the player is getting a notification including changelog. Only happens if notification are enabled." );
	}

	public boolean isVersionCheckingEnabled()
	{
		return this.isEnabled;
	}

	public String lastCheck()
	{
		return this.lastCheck;
	}

	/**
	 * Stores the current date in milli seconds into the "lastCheck" field of the config and makes it persistent.
	 */
	public void updateLastCheck()
	{
		final Date now = new Date();
		final long nowInMs = now.getTime();
		final String nowAsString = Long.toString( nowInMs );

		this.config.get( "cache", "lastCheck", "0" ).set( nowAsString );

		this.config.save();
	}

	public int interval()
	{
		return this.interval;
	}

	public String level()
	{
		return this.level;
	}

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

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

	public void save()
	{
		if( this.config.hasChanged() )
		{
			this.config.save();
		}
	}
}