/**

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* @class elFinder.history

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* Store visited folders

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* and provide "back" and "forward" methods

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*

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* @author Dmitry (dio) Levashov

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*/

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elFinder.prototype.history = function(fm) {

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"use strict";

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var self = this,

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/**

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* Update history on "open" event?

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*

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* @type Boolean

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*/

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update = true,

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/**

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* Directories hashes storage

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*

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* @type Array

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*/

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history = [],

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/**

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* Current directory index in history

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*

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* @type Number

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*/

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current,

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/**

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* Clear history

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*

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* @return void

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*/

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reset = function() {

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history = [fm.cwd().hash];

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current = 0;

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update = true;

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},

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/**

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* Browser native history object

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*/

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nativeHistory = (fm.options.useBrowserHistory && window.history && window.history.pushState)? window.history : null,

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/**

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* Open prev/next folder

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*

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* @Boolen open next folder?

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* @return jQuery.Deferred

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*/

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go = function(fwd) {

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if ((fwd && self.canForward()) || (!fwd && self.canBack())) {

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update = false;

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return fm.exec('open', history[fwd ? ++current : --current]).fail(reset);

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}

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return $.Deferred().reject();

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},

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/**

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* Sets the native history.

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*

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* @param String thash target hash

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*/

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setNativeHistory = function(thash) {

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if (nativeHistory && (! nativeHistory.state || nativeHistory.state.thash !== thash)) {

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nativeHistory.pushState({thash: thash}, null, location.pathname + location.search + (thash? '#elf_' + thash : ''));

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}

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};

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/**

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* Return true if there is previous visited directories

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*

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* @return Boolen

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*/

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this.canBack = function() {

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return current > 0;

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};

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/**

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* Return true if can go forward

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*

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* @return Boolen

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*/

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this.canForward = function() {

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return current < history.length - 1;

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};

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/**

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* Go back

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*

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* @return void

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*/

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this.back = go;

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/**

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* Go forward

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*

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* @return void

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*/

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this.forward = function() {

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return go(true);

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};

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// bind to elfinder events

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fm.bind('init', function() {

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if (nativeHistory && !nativeHistory.state) {

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setNativeHistory(fm.startDir());

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}

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})

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.open(function() {

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var l = history.length,

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cwd = fm.cwd().hash;

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if (update) {

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current >= 0 && l > current + 1 && history.splice(current+1);

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history[history.length-1] != cwd && history.push(cwd);

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current = history.length - 1;

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}

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update = true;

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setNativeHistory(cwd);

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})

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.reload(fm.options.reloadClearHistory && reset);

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};

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