/*
 * This file is part of Applied Energistics 2.
 * Copyright (c) 2013 - 2014, 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.core;


import javax.annotation.Nonnull;

import org.apache.logging.log4j.Level;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.apache.logging.log4j.message.ParameterizedMessage;

import net.minecraft.util.BlockPos;

import appeng.core.features.AEFeature;
import appeng.tile.AEBaseTile;
import appeng.util.Platform;


public final class AELog
{
	private static final String LOGGER_PREFIX = "AE2:";
	private static final String SERVER_SUFFIX = "S";
	private static final String CLIENT_SUFFIX = "C";

	private static final Logger SERVER = LogManager.getFormatterLogger( LOGGER_PREFIX + SERVER_SUFFIX );
	private static final Logger CLIENT = LogManager.getFormatterLogger( LOGGER_PREFIX + CLIENT_SUFFIX );

	private static final String BLOCK_UPDATE = "Block Update of %s @ ( %s )";

	private static final String DEFAULT_EXCEPTION_MESSAGE = "Exception: ";

	private AELog()
	{
	}

	/**
	 * Returns a {@link Logger} logger suitable for the effective side (client/server).
	 *
	 * @return a suitable logger instance
	 */
	private static Logger getLogger()
	{
		return Platform.isServer() ? SERVER : CLIENT;
	}

	/**
	 * Indicates of the global log is enabled or disabled.
	 *
	 * By default it is enabled.
	 *
	 * @return true when the log is enabled.
	 */
	public static boolean isLogEnabled()
	{
		return AEConfig.instance == null || AEConfig.instance.isFeatureEnabled( AEFeature.Logging );
	}

	/**
	 * Logs a formatted message with a specific log level.
	 *
	 * This uses {@link String#format(String, Object...)} as opposed to the {@link ParameterizedMessage} to allow a more
	 * flexible formatting.
	 *
	 * The output can be globally disabled via the configuration file.
	 *
	 * @param level the intended level.
	 * @param message the message to be formatted.
	 * @param params the parameters used for {@link String#format(String, Object...)}.
	 */
	public static void log( @Nonnull final Level level, @Nonnull final String message, final Object... params )
	{
		if( AELog.isLogEnabled() )
		{
			final String formattedMessage = String.format( message, params );
			final Logger logger = getLogger();

			logger.log( level, formattedMessage );
		}
	}

	/**
	 * Log an exception with a custom message formated via {@link String#format(String, Object...)}
	 *
	 * Similar to {@link AELog#log(Level, String, Object...)}.
	 *
	 * @see AELog#log(Level, String, Object...)
	 *
	 * @param level the intended level.
	 * @param exception
	 * @param message the message to be formatted.
	 * @param params the parameters used for {@link String#format(String, Object...)}.
	 */
	public static void log( @Nonnull final Level level, @Nonnull final Throwable exception, @Nonnull String message, final Object... params )
	{
		if( AELog.isLogEnabled() )
		{
			final String formattedMessage = String.format( message, params );
			final Logger logger = getLogger();

			logger.log( level, formattedMessage, exception );
		}
	}

	/**
	 * @see AELog#log(Level, String, Object...)
	 * @param format
	 * @param params
	 */
	public static void info( @Nonnull final String format, final Object... params )
	{
		log( Level.INFO, format, params );
	}

	/**
	 * Log exception as {@link Level#INFO}
	 *
	 * @see AELog#log(Level, Throwable, String, Object...)
	 *
	 * @param exception
	 */
	public static void info( @Nonnull final Throwable exception )
	{
		log( Level.INFO, exception, DEFAULT_EXCEPTION_MESSAGE );
	}

	/**
	 * Log exception as {@link Level#INFO}
	 *
	 * @see AELog#log(Level, Throwable, String, Object...)
	 *
	 * @param exception
	 * @param message
	 */
	public static void info( @Nonnull final Throwable exception, @Nonnull final String message )
	{
		log( Level.INFO, exception, message );
	}

	/**
	 * @see AELog#log(Level, String, Object...)
	 * @param format
	 * @param params
	 */
	public static void warn( @Nonnull final String format, final Object... params )
	{
		log( Level.WARN, format, params );
	}

	/**
	 * Log exception as {@link Level#WARN}
	 *
	 * @see AELog#log(Level, Throwable, String, Object...)
	 *
	 * @param exception
	 */
	public static void warn( @Nonnull final Throwable exception )
	{
		log( Level.WARN, exception, DEFAULT_EXCEPTION_MESSAGE );
	}

	/**
	 * Log exception as {@link Level#WARN}
	 *
	 * @see AELog#log(Level, Throwable, String, Object...)
	 *
	 * @param exception
	 * @param message
	 */
	public static void warn( @Nonnull final Throwable exception, @Nonnull final String message )
	{
		log( Level.WARN, exception, message );
	}

	/**
	 * @see AELog#log(Level, String, Object...)
	 * @param format
	 * @param params
	 */
	public static void error( @Nonnull final String format, final Object... params )
	{
		log( Level.ERROR, format, params );
	}

	/**
	 * Log exception as {@link Level#ERROR}
	 *
	 * @see AELog#log(Level, Throwable, String, Object...)
	 *
	 * @param exception
	 */
	public static void error( @Nonnull final Throwable exception )
	{
		log( Level.ERROR, exception, DEFAULT_EXCEPTION_MESSAGE );
	}

	/**
	 * Log exception as {@link Level#ERROR}
	 *
	 * @see AELog#log(Level, Throwable, String, Object...)
	 *
	 * @param exception
	 * @param message
	 */
	public static void error( @Nonnull final Throwable exception, @Nonnull final String message )
	{
		log( Level.ERROR, exception, message );
	}

	/**
	 * Log message as {@link Level#DEBUG}
	 *
	 * @see AELog#log(Level, String, Object...)
	 * @param format
	 * @param data
	 */
	public static void debug( @Nonnull final String format, final Object... data )
	{
		if( AELog.isDebugLogEnabled() )
		{
			log( Level.DEBUG, format, data );
		}
	}

	/**
	 * Log exception as {@link Level#DEBUG}
	 *
	 * @see AELog#log(Level, Throwable, String, Object...)
	 *
	 * @param exception
	 */
	public static void debug( @Nonnull final Throwable exception )
	{
		if( AELog.isDebugLogEnabled() )
		{
			log( Level.DEBUG, exception, DEFAULT_EXCEPTION_MESSAGE );
		}
	}

	/**
	 * Log exception as {@link Level#DEBUG}
	 *
	 * @see AELog#log(Level, Throwable, String, Object...)
	 *
	 * @param exception
	 * @param message
	 */
	public static void debug( @Nonnull final Throwable exception, @Nonnull final String message )
	{
		if( AELog.isDebugLogEnabled() )
		{
			log( Level.DEBUG, exception, message );
		}
	}

	/**
	 * Use to check for an enabled debug log.
	 *
	 * Can be used to prevent the execution of debug logic.
	 *
	 * @return true when the debug log is enabled.
	 */
	public static boolean isDebugLogEnabled()
	{
		return AEConfig.instance.isFeatureEnabled( AEFeature.DebugLogging );
	}

	//
	// Specialized handlers
	//

	/**
	 * A specialized logging for grinder recipes, can be disabled inside configuration file.
	 *
	 * @param message String to be logged
	 */
	public static void grinder( @Nonnull final String message )
	{
		if( AEConfig.instance.isFeatureEnabled( AEFeature.GrinderLogging ) )
		{
			log( Level.DEBUG, "grinder: " + message );
		}
	}

	/**
	 * A specialized logging for mod integration errors, can be disabled inside configuration file.
	 *
	 * @param exception
	 */
	public static void integration( @Nonnull final Throwable exception )
	{
		if( AEConfig.instance.isFeatureEnabled( AEFeature.IntegrationLogging ) )
		{
			debug( exception );
		}
	}

	/**
	 * Logging of block updates.
	 *
	 * Off by default, can be enabled inside the configuration file.
	 *
	 * @see AELog#log(Level, String, Object...)
	 * @param pos
	 * @param aeBaseTile
	 */
	public static void blockUpdate( @Nonnull final BlockPos pos, @Nonnull final AEBaseTile aeBaseTile )
	{
		if( AEConfig.instance.isFeatureEnabled( AEFeature.UpdateLogging ) )
		{
			info( BLOCK_UPDATE, aeBaseTile.getClass().getName(), pos );
		}
	}

	/**
	 * Use to check for an enabled crafting log.
	 *
	 * Can be used to prevent the execution of unneeded logic.
	 *
	 * @return true when the crafting log is enabled.
	 */
	public static boolean isCraftingLogEnabled()
	{
		return AEConfig.instance.isFeatureEnabled( AEFeature.CraftingLog );
	}

	/**
	 * Logging for autocrafting.
	 *
	 * Off by default, can be enabled inside the configuration file.
	 *
	 * @see AELog#log(Level, String, Object...)
	 * @param message
	 * @param params
	 */
	public static void crafting( @Nonnull final String message, final Object... params )
	{
		if( AELog.isCraftingLogEnabled() )
		{
			log( Level.INFO, message, params );
		}
	}

	/**
	 * Use to check for an enabled crafting debug log.
	 *
	 * Can be used to prevent the execution of unneeded logic.
	 *
	 * @return true when the crafting debug log is enabled.
	 */
	public static boolean isCraftingDebugLogEnabled()
	{
		return AEConfig.instance.isFeatureEnabled( AEFeature.CraftingLog ) && AEConfig.instance.isFeatureEnabled( AEFeature.DebugLogging );
	}

	/**
	 * Debug logging for autocrafting.
	 *
	 * Off by default, can be enabled inside the configuration file.
	 *
	 * @see AELog#log(Level, String, Object...)
	 * @param message
	 * @param params
	 */
	public static void craftingDebug( @Nonnull final String message, final Object... params )
	{
		if( AELog.isCraftingDebugLogEnabled() )
		{
			log( Level.DEBUG, message, params );
		}
	}
}