var $ = require("jquery");


var Key = {
    UP: 38,
    DOWN: 40,
    PAGE_UP: 33,
    PAGE_DOWN: 34,
    HOME: 36,
    END: 35,
    LEFT: 37,
    RIGHT: 39,
    ENTER: 13,
    ESC: 27,
    TAB: 9,
    SPACE: 32,
    BACKSPACE: 8,
};
// Add A-Z
for (var i = 65; i <= 90; i++) {
    Key[String.fromCharCode(i)] = i;
}


var formatSize = function (bytes) {
    if (bytes === 0)
        return "0";
    var prefix = ["b", "kb", "mb", "gb", "tb"];
    for (var i = 0; i < prefix.length; i++){
        if (Math.pow(1024, i + 1) > bytes){
            break;
        }
    }
    var precision;
    if (bytes%Math.pow(1024, i) === 0)
        precision = 0;
    else
        precision = 1;
    return (bytes/Math.pow(1024, i)).toFixed(precision) + prefix[i];
};


var formatTimeDelta = function (milliseconds) {
    var time = milliseconds;
    var prefix = ["ms", "s", "min", "h"];
    var div = [1000, 60, 60];
    var i = 0;
    while (Math.abs(time) >= div[i] && i < div.length) {
        time = time / div[i];
        i++;
    }
    return Math.round(time) + prefix[i];
};


var formatTimeStamp = function (seconds) {
    var ts = (new Date(seconds * 1000)).toISOString();
    return ts.replace("T", " ").replace("Z", "");
};

function EventEmitter() {
    this.listeners = {};
}
EventEmitter.prototype.emit = function (event) {
    if (!(event in this.listeners)) {
        return;
    }
    var args = Array.prototype.slice.call(arguments, 1);
    this.listeners[event].forEach(function (listener) {
        listener.apply(this, args);
    }.bind(this));
};
EventEmitter.prototype.addListener = function (events, f) {
    events.split(" ").forEach(function (event) {
        this.listeners[event] = this.listeners[event] || [];
        this.listeners[event].push(f);
    }.bind(this));
};
EventEmitter.prototype.removeListener = function (events, f) {
    if (!(events in this.listeners)) {
        return false;
    }
    events.split(" ").forEach(function (event) {
        var index = this.listeners[event].indexOf(f);
        if (index >= 0) {
            this.listeners[event].splice(index, 1);
        }
    }.bind(this));
};

function getCookie(name) {
    var r = document.cookie.match("\\b" + name + "=([^;]*)\\b");
    return r ? r[1] : undefined;
}
var xsrf = $.param({_xsrf: getCookie("_xsrf")});

//Tornado XSRF Protection.
$.ajaxPrefilter(function (options) {
    if (["post", "put", "delete"].indexOf(options.type.toLowerCase()) >= 0 && options.url[0] === "/") {
        if (options.data) {
            options.data += ("&" + xsrf);
        } else {
            options.data = xsrf;
        }
    }
});
// Log AJAX Errors
$(document).ajaxError(function (event, jqXHR, ajaxSettings, thrownError) {
    var message = jqXHR.responseText;
    console.error(message, arguments);
    EventLogActions.add_event(thrownError + ": " + message);
    window.alert(message);
});

module.exports = {
    EventEmitter: EventEmitter,
    formatSize: formatSize,
    formatTimeDelta: formatTimeDelta,
    formatTimeStamp: formatTimeStamp,
    Key: Key
};