/*******************************************************************************
 * Copyright 2011-2013 Sergey Tarasevich
 *
 * 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 com.nostra13.universalimageloader.utils;

import android.util.Log;
import com.nostra13.universalimageloader.core.ImageLoader;

/**
 * "Less-word" analog of Android {@link android.util.Log logger}
 *
 * @author Sergey Tarasevich (nostra13[at]gmail[dot]com)
 * @since 1.6.4
 */
public final class L {

	private static final String LOG_FORMAT = "%1$s\n%2$s";
	private static volatile boolean writeDebugLogs = false;
	private static volatile boolean writeLogs = true;

	private L() {
	}

	/**
	 * Enables logger (if {@link #disableLogging()} was called before)
	 *
	 * @deprecated Use {@link #writeLogs(boolean) writeLogs(true)} instead
	 */
	@Deprecated
	public static void enableLogging() {
		writeLogs(true);
	}

	/**
	 * Disables logger, no logs will be passed to LogCat, all log methods will do nothing
	 *
	 * @deprecated Use {@link #writeLogs(boolean) writeLogs(false)} instead
	 */
	@Deprecated
	public static void disableLogging() {
		writeLogs(false);
	}

	/**
	 * Enables/disables detail logging of {@link ImageLoader} work.
	 * Consider {@link com.nostra13.universalimageloader.utils.L#disableLogging()} to disable
	 * ImageLoader logging completely (even error logs)<br />
	 * Debug logs are disabled by default.
	 */
	public static void writeDebugLogs(boolean writeDebugLogs) {
		L.writeDebugLogs = writeDebugLogs;
	}

	/** Enables/disables logging of {@link ImageLoader} completely (even error logs). */
	public static void writeLogs(boolean writeLogs) {
		L.writeLogs = writeLogs;
	}

	public static void d(String message, Object... args) {
		if (writeDebugLogs) {
			log(Log.DEBUG, null, message, args);
		}
	}

	public static void i(String message, Object... args) {
		log(Log.INFO, null, message, args);
	}

	public static void w(String message, Object... args) {
		log(Log.WARN, null, message, args);
	}

	public static void e(Throwable ex) {
		log(Log.ERROR, ex, null);
	}

	public static void e(String message, Object... args) {
		log(Log.ERROR, null, message, args);
	}

	public static void e(Throwable ex, String message, Object... args) {
		log(Log.ERROR, ex, message, args);
	}

	private static void log(int priority, Throwable ex, String message, Object... args) {
		if (!writeLogs) return;
		if (args.length > 0) {
			message = String.format(message, args);
		}

		String log;
		if (ex == null) {
			log = message;
		} else {
			String logMessage = message == null ? ex.getMessage() : message;
			String logBody = Log.getStackTraceString(ex);
			log = String.format(LOG_FORMAT, logMessage, logBody);
		}
		Log.println(priority, ImageLoader.TAG, log);
	}
}