(function () {

    'use strict';

    var stack        = require('callsite'),
        util         = require('util'),
        EventEmitter = require('events').EventEmitter,
        path         = require('path');
//        colors       = require('colors');

    /**
     * consoleOriginal
     *
     * NodeJS console object
     * @type {Object}
     */
    var consoleOriginal = console;

    /**
     * getLocation
     *
     * Get location of log.
     * ie. filename and line number
     */
    var getLocation = function () {
        
        var st     = stack()[2],
            result = {};

        result.filename = path.basename(st.getFileName());
        result.line = st.getLineNumber();

        return result;
    };

    /**
     * buildTime
     *
     * @param  {timestamp} timestamp
     * @return {String}                  timestamp to String
     */
    var buildTime = function (timestamp) {
        return (new Date(timestamp)).toISOString() + " ";
    };

    /**
     * buildDate
     *
     * @param  {timestamp} timestamp
     * @return {String}             timestamp to string
     */
    var buildDate = function (timestamp) {
        return (new Date(timestamp)).toDateString() + " ";
    };

    /**
     * buildTags
     *
     * @param  {Array} tags
     * @return {String}     "[tag1][tag2]"
     */
    var buildTags = function (tags) {
        return '[' + tags.join('][') + ']';
    };

    /**
     * buildFileInfos
     *
     * @param {Object} infos
     * @param {String} infos.filename
     * @param {String} infos.line
     */
    var buildFileInfos = function (infos) {
        return '[' + infos.filename + ':' + infos.line + ']';
    };


    /*
     * Console2
     *
     * @constructor
     *
     * @param {Object}  opt                     Optional default options for all loggers.
     * @param {Boolean} opt.logInConsole        Should all loggers print to console by default ? Default true.
     * @param {Boolean} opt.logInFile           Should all loggers saver log in file by default ? Default true.
     *
     * @param {int}     opt.contextMediumSize   Medium size of the context part of a log message.
     *                                          Used when calculating indent. Default to 45.
     * @param {int}     opt.spaceSize           Space between context part and log part. Default to 4.
     * @param {String}  opt.color               Default color output for all loggers. Default blue.
     * 
     * @param {Boolean} opt.alwaysTags          Always print tags (even without tag() ). Default false.
     * @param {Boolean} opt.alwaysLocation      Always print location (even without file() ). Default false.
     * @param {Boolean} opt.alwaysTime          Always print time (even without time() ). Default false.
     * @param {Boolean} opt.alwaysDate          Always print date (even without date() ). Default false.
     */
    var Console2 = function (opt) {

        if (!opt) {
            opt = {};
        }

        /**
         * opt
         *
         * Constructor opt.
         * Setting default.
         */
        this.opt = {
            logInConsole : opt.logInConsole || true,
            logInFile    : opt.logInFile || true,

            contextMediumSize : opt.contextMediumSize || 45,
            spaceSize         : opt.spaceSize || 4,

            color : opt.color || "blue",

            alwaysTags     : opt.alwaysTags || false,
            alwaysLocation : opt.alwaysLocation || false,
            alwaysTime     : opt.alwaysTime || false,
            alwaysDate     : opt.alwaysDate || false
        };


        /**
         * _tags
         *
         * Store all tags for current log
         * 
         * @type {Array}
         */
        this._tags = [];
    
        /**
         *._time
         *
         * Log time (full date) ?
         * 
         * @type {Boolean}
         */
        this._time = false;
    
        /**
         * _date
         *
         * Log date ?
         * 
         * @type {Boolean}
         */
        this._date = false;
    
        /**
         * _location
         *
         * Should we log filename and line number ?
         *
         * @type {Boolean}
         */
        this._location = false; 

        /**
         * _reset
         *
         * Reset properties after log
         */
        this._reset = function () {
            this._tags    = [];
            this._time    = false;
            this._date    = false;
            this.location = false;
    
            return this;
        };
    
    
    };



    //inherits form EventEmitter.prototype
    util.inherits(Console2, EventEmitter);


    /**
     * Console2.prototype.time
     *
     * Log the time
     */
    Console2.prototype.time = function () {
        this._time = true;

        return this;
    };

    /**
     * Console2.prototype.date
     *
     * Log the date
     */
    Console2.prototype.date = function () {
        this._date = true;

        return this;
    };

    /**
     * Console2.prototype.tag
     *
     * Add tags
     * @param  {*} tag 
     */
    Console2.prototype.tag = Console2.prototype.t = function () {
        var tags = Array.prototype.slice.call(arguments, 0);
        this._tags = this._tags.concat(tags);
        
        return this;
    };

    /**
     * Console2.prototype.file
     *
     * Log the file name + line
     */
    Console2.prototype.file = Console2.prototype.f = function () {
        this._location = true;

        return this;
    };


    /**
     * Console2.prototype.buildMessage
     *
     * @param {Object}  log             The log object
     *
     * @param {Object}  opt             Optional options telling what to include in the message
     * @param {Boolean} opt.tags        Print Tags ? Default false.
     * @param {Boolean} opt.location    Print location ? Default false.
     * @param {Boolean} opt.time        Print time ? Default false.
     * @param {Boolean} opt.date        Print date ? Default false.
     *
     * @return {String}                 The message to print usualy.
     */
    Console2.prototype.buildMessage = function (log, opt) {

        if (!opt) {
            opt = {};
        }

        opt.tags     = opt.tags || false;
        opt.location = opt.location || false;
        opt.time     = opt.time || false;
        opt.date     = opt.date || false;

        var result = "";

        if (opt.time && log.context.time) {
            result += buildTime(log.context.time);
        }

        if (opt.date && log.context.time) {
            result += buildDate(log.context.time);
        }

        if (opt.tags && log.context.tags) {
            result += buildTags(log.context.tags);
        }
        
        if (opt.location && log.context.location.filename && log.context.location.line) {
            result += buildFileInfos(log.context.location);
        }

        if (result.length > 0) { //if there is context string
            //add space according to the contextMediumSize 
            var offset = this.opt.contextMediumSize  - result.length;
            
            if (offset < 0) { //context string could be longer than medium size
                offset = 0;
            }

            result += new Array(offset + this.opt.spaceSize).join(' ');
        }

        result += log.argsString;


        return result;

    };



    /**
     * Console2.prototype.addLogger
     *
     * Create a new logger
     * You can then use it with console.myNewLogger
     *
     * @param {String}  name                 The name of the logger.
     * @param {String}  color                Optional. Color of the console output. Default blue.
     *                                       See text colors from https://github.com/Marak/colors.js
     *
     * @param {Object}  opt                  Optional options object. @see Console2 opt for default values.
     * @param {Boolean} opt.logInConsole     Should the logger print to the console ? 
     * @param {Boolean} opt.logInFile        If the log should be save in file.
     * @param {Boolean} opt.alwaysTags       Always print tags (even without tag() )
     * @param {Boolean} opt.alwaysLocation   Always print location (even without file() )
     * @param {Boolean} opt.alwaysTime       Always print time (even without time() )
     * @param {Boolean} opt.alwaysDate       Always print date (even without date() )
     */
    Console2.prototype.addLogger = function (name, color, opt) {

        if (!opt) {
            opt = {};
        }
        
        if (!name) {
            throw new Error("No name given at addLogger");
        }

        opt.name             = name;
        opt.color            = color || this.opt.color;
        opt.type             = opt.type || opt.name;
        opt.logInConsole     = opt.logInConsole || this.opt.logInConsole;
        opt.logInFile        = opt.logInFile || this.opt.logInFile;
        opt.alwaysTags       = opt.alwaysTags || this.opt.alwaysTags;
        opt.alwaysLocation   = opt.alwaysLocation || this.opt.alwaysLocation;
        opt.alwaysTime       = opt.alwaysTime || this.opt.alwaysTime;
        opt.alwaysDate       = opt.alwaysDate || this.opt.alwaysDate;

        this[name] = function () {

            var location = getLocation();
            var time     = Date.now();

            //Let's build the log object

            var log = {
                type       : opt.type || name,
                context    : {
                    tags     : this._tags,
                    file     : this._location,
                    time     : time,
                    location : location
                },
                args       : arguments,
                argsString : util.format.apply(console, arguments), //stringify arguments
                opt        : opt
            };

            //Build the string message
            log.message = this.buildMessage(log, {
                tags     : this._tags.length > 0 || this.opt.alwaysTags,
                location : this._location || this.opt.alwaysLocation,
                time     : this._time || this.opt.alwaysTime,
                date     : this._date || this.opt.alwaysDate
            });

            //Emit events
            this.emit('new', log);
            this.emit(opt.type || name, log);
            
            //If the logger should print the message
            //Print it
            if (opt.logInConsole) {
                global.console.log(log.message);
            }

            this._reset();
        };


    };

    //Keep the old console
    //use also `global.console`
    Console2.prototype.Original = consoleOriginal;
    
    module.exports = Console2;

}());