/**
 * The file upload code uses several hooks to interact with blueimps jQuery file upload library:
 * 1. the core upload handling hooks are added when initializing the plugin,
 * 2. if the browser supports progress events they are added in a separate set after the initialization
 * 3. every app can add it's own triggers for fileupload
 *    - files adds d'n'd handlers and also reacts to done events to add new rows to the filelist
 *    - TODO pictures upload button
 *    - TODO music upload button
 */

/**
 * Function that will allow us to know if Ajax uploads are supported
 * @link https://github.com/New-Bamboo/example-ajax-upload/blob/master/public/index.html
 * also see article @link http://blog.new-bamboo.co.uk/2012/01/10/ridiculously-simple-ajax-uploads-with-formdata
 */
function supportAjaxUploadWithProgress() {
	return supportFileAPI() && supportAjaxUploadProgressEvents() && supportFormData();

	// Is the File API supported?
	function supportFileAPI() {
		var fi = document.createElement('INPUT');
		fi.type = 'file';
		return 'files' in fi;
	};

	// Are progress events supported?
	function supportAjaxUploadProgressEvents() {
		var xhr = new XMLHttpRequest();
		return !! (xhr && ('upload' in xhr) && ('onprogress' in xhr.upload));
	};

	// Is FormData supported?
	function supportFormData() {
		return !! window.FormData;
	}
}

/**
 * keeps track of uploads in progress and implements callbacks for the conflicts dialog
 * @type {OC.Upload}
 */
OC.Upload = {
	_uploads: [],
	/**
	 * cancels a single upload, 
	 * @deprecated because it was only used when a file currently beeing uploaded was deleted. Now they are added after
	 * they have been uploaded.
	 * @param {string} dir
	 * @param {string} filename
	 * @returns {unresolved}
	 */
	cancelUpload:function(dir, filename) {
		var self = this;
		var deleted = false;
		//FIXME _selections
		jQuery.each(this._uploads, function(i, jqXHR) {
			if (selection.dir === dir && selection.uploads[filename]) {
				deleted = self.deleteSelectionUpload(selection, filename);
				return false; // end searching through selections
			}
		});
		return deleted;
	},
	/**
	 * deletes the jqHXR object from a data selection
	 * @param {object} data
	 */
	deleteUpload:function(data) {
		delete data.jqXHR;
	},
	/**
	 * cancels all uploads
	 */
	cancelUploads:function() {
		this.log('canceling uploads');
		jQuery.each(this._uploads,function(i, jqXHR){
			jqXHR.abort();
		});
		this._uploads = [];
	},
	rememberUpload:function(jqXHR){
		if (jqXHR) {
			this._uploads.push(jqXHR);
		}
	},
	/**
	 * Checks the currently known uploads.
	 * returns true if any hxr has the state 'pending'
	 * @returns {boolean}
	 */
	isProcessing:function(){
		var count = 0;
		
		jQuery.each(this._uploads,function(i, data){
			if (data.state() === 'pending') {
				count++;
			}
		});
		return count > 0;
	},
	/**
	 * callback for the conflicts dialog
	 * @param {object} data
	 */
	onCancel:function(data) {
		this.cancelUploads();
	},
	/**
	 * callback for the conflicts dialog
	 * calls onSkip, onReplace or onAutorename for each conflict
	 * @param {object} conflicts - list of conflict elements
	 */
	onContinue:function(conflicts) {
		var self = this;
		//iterate over all conflicts
		jQuery.each(conflicts, function (i, conflict) {
			conflict = $(conflict);
			var keepOriginal = conflict.find('.original input[type="checkbox"]:checked').length === 1;
			var keepReplacement = conflict.find('.replacement input[type="checkbox"]:checked').length === 1;
			if (keepOriginal && keepReplacement) {
				// when both selected -> autorename
				self.onAutorename(conflict.data('data'));
			} else if (keepReplacement) {
				// when only replacement selected -> overwrite
				self.onReplace(conflict.data('data'));
			} else {
				// when only original seleted -> skip
				// when none selected -> skip
				self.onSkip(conflict.data('data'));
			}
		});
	},
	/**
	 * handle skipping an upload
	 * @param {object} data
	 */
	onSkip:function(data){
		this.log('skip', null, data);
		this.deleteUpload(data);
	},
	/**
	 * handle replacing a file on the server with an uploaded file
	 * @param {object} data
	 */
	onReplace:function(data){
		this.log('replace', null, data);
		data.data.append('resolution', 'replace');
		data.submit();
	},
	/**
	 * handle uploading a file and letting the server decide a new name
	 * @param {object} data
	 */
	onAutorename:function(data){
		this.log('autorename', null, data);
		if (data.data) {
			data.data.append('resolution', 'autorename');
		} else {
			data.formData.push({name:'resolution',value:'autorename'}); //hack for ie8
		}
		data.submit();
	},
	_trace:false, //TODO implement log handler for JS per class?
	log:function(caption, e, data) {
		if (this._trace) {
			console.log(caption);
			console.log(data);
		}
	},
	/**
	 * TODO checks the list of existing files prior to uploading and shows a simple dialog to choose
	 * skip all, replace all or choose which files to keep
	 * @param {array} selection of files to upload
	 * @param {object} callbacks - object with several callback methods
	 * @param {function} callbacks.onNoConflicts
	 * @param {function} callbacks.onSkipConflicts
	 * @param {function} callbacks.onReplaceConflicts
	 * @param {function} callbacks.onChooseConflicts
	 * @param {function} callbacks.onCancel
	 */
	checkExistingFiles: function (selection, callbacks){
		// TODO check filelist before uploading and show dialog on conflicts, use callbacks
		callbacks.onNoConflicts(selection);
	}
};

$(document).ready(function() {

	if ( $('#file_upload_start').exists() ) {

		var file_upload_param = {
			dropZone: $('#content'), // restrict dropZone to content div
			autoUpload: false,
			sequentialUploads: true,
			//singleFileUploads is on by default, so the data.files array will always have length 1
			/**
			 * on first add of every selection
			 * - check all files of originalFiles array with files in dir
			 * - on conflict show dialog
			 *   - skip all -> remember as single skip action for all conflicting files
			 *   - replace all -> remember as single replace action for all conflicting files
			 *   - choose -> show choose dialog
			 *     - mark files to keep
			 *       - when only existing -> remember as single skip action
			 *       - when only new -> remember as single replace action
			 *       - when both -> remember as single autorename action
			 * - start uploading selection
			 * @param {object} e
			 * @param {object} data
			 * @returns {boolean}
			 */
			add: function(e, data) {
				OC.Upload.log('add', e, data);
				var that = $(this);
			
				// we need to collect all data upload objects before starting the upload so we can check their existence
				// and set individual conflict actions. unfortunately there is only one variable that we can use to identify
				// the selection a data upload is part of, so we have to collect them in data.originalFiles
				// turning singleFileUploads off is not an option because we want to gracefully handle server errors like
				// already exists
			
				// create a container where we can store the data objects
				if ( ! data.originalFiles.selection ) {
					// initialize selection and remember number of files to upload
					data.originalFiles.selection = {
						uploads: [],
						filesToUpload: data.originalFiles.length,
						totalBytes: 0
					};
				}
				var selection = data.originalFiles.selection;
			
				// add uploads
				if ( selection.uploads.length < selection.filesToUpload ){
					// remember upload
					selection.uploads.push(data);
				}
			
				//examine file
				var file = data.files[0];
			
				if (file.type === '' && file.size === 4096) {
					data.textStatus = 'dirorzero';
					data.errorThrown = t('files', 'Unable to upload {filename} as it is a directory or has 0 bytes',
						{filename: file.name}
					);
				}
			
				// add size
				selection.totalBytes += file.size;
			
				//check max upload size
				if (selection.totalBytes > $('#max_upload').val()) {
					data.textStatus = 'notenoughspace';
					data.errorThrown = t('files', 'Not enough space available');
				}
			
				// end upload for whole selection on error
				if (data.errorThrown) {
					// trigger fileupload fail
					var fu = that.data('blueimp-fileupload') || that.data('fileupload');
					fu._trigger('fail', e, data);
					return false; //don't upload anything
				}

				// check existing files when all is collected
				if ( selection.uploads.length >= selection.filesToUpload ) {
				
					//remove our selection hack:
					delete data.originalFiles.selection;

					var callbacks = {
					
						onNoConflicts: function (selection) {
							$.each(selection.uploads, function(i, upload) {
								upload.submit();
							});
						},
						onSkipConflicts: function (selection) {
							//TODO mark conflicting files as toskip
						},
						onReplaceConflicts: function (selection) {
							//TODO mark conflicting files as toreplace
						},
						onChooseConflicts: function (selection) {
							//TODO mark conflicting files as chosen
						},
						onCancel: function (selection) {
							$.each(selection.uploads, function(i, upload) {
								upload.abort();
							});
						}
					};

					OC.Upload.checkExistingFiles(selection, callbacks);
				
				}

				return true; // continue adding files
			},
			/**
			 * called after the first add, does NOT have the data param
			 * @param {object} e
			 */
			start: function(e) {
				OC.Upload.log('start', e, null);
			},
			submit: function(e, data) {
				OC.Upload.rememberUpload(data);
				if ( ! data.formData ) {
					// noone set update parameters, we set the minimum
					data.formData = {
						requesttoken: oc_requesttoken,
								 dir: $('#dir').val()
					};
				}
			},
			fail: function(e, data) {
				OC.Upload.log('fail', e, data);
				if (typeof data.textStatus !== 'undefined' && data.textStatus !== 'success' ) {
					if (data.textStatus === 'abort') {
						$('#notification').text(t('files', 'Upload cancelled.'));
					} else {
						// HTTP connection problem
						$('#notification').text(data.errorThrown);
					}
					$('#notification').fadeIn();
					//hide notification after 5 sec
					setTimeout(function() {
						$('#notification').fadeOut();
					}, 5000);
				}
				OC.Upload.deleteUpload(data);
			},
			/**
			 * called for every successful upload
			 * @param {object} e
			 * @param {object} data
			 */
			done:function(e, data) {
				OC.Upload.log('done', e, data);
				// handle different responses (json or body from iframe for ie)
				var response;
				if (typeof data.result === 'string') {
					response = data.result;
				} else {
					//fetch response from iframe
					response = data.result[0].body.innerText;
				}
				var result=$.parseJSON(response);

				delete data.jqXHR;
				
				if(typeof result[0] === 'undefined') {
					data.textStatus = 'servererror';
					data.errorThrown = t('files', 'Could not get result from server.');
					var fu = $(this).data('blueimp-fileupload') || $(this).data('fileupload');
					fu._trigger('fail', e, data);
				} else if (result[0].status === 'existserror') {
					//show "file already exists" dialog
					var original = result[0];
					var replacement = data.files[0];
					var fu = $(this).data('blueimp-fileupload') || $(this).data('fileupload');
					OC.dialogs.fileexists(data, original, replacement, OC.Upload, fu);
				} else if (result[0].status !== 'success') {
					//delete data.jqXHR;
					data.textStatus = 'servererror';
					data.errorThrown = result.data.message; // error message has been translated on server
					var fu = $(this).data('blueimp-fileupload') || $(this).data('fileupload');
					fu._trigger('fail', e, data);
				}
			},
			/**
			 * called after last upload
			 * @param {object} e
			 * @param {object} data
			 */
			stop: function(e, data) {
				OC.Upload.log('stop', e, data);
			}
		};

		// initialize jquery fileupload (blueimp)
		var fileupload = $('#file_upload_start').fileupload(file_upload_param);
		window.file_upload_param = fileupload;

		if(supportAjaxUploadWithProgress()) {

			// add progress handlers
			fileupload.on('fileuploadadd', function(e, data) {
				OC.Upload.log('progress handle fileuploadadd', e, data);
				//show cancel button
				//if(data.dataType !== 'iframe') { //FIXME when is iframe used? only for ie?
				//	$('#uploadprogresswrapper input.stop').show();
				//}
			});
			// add progress handlers
			fileupload.on('fileuploadstart', function(e, data) {
				OC.Upload.log('progress handle fileuploadstart', e, data);
				$('#uploadprogresswrapper input.stop').show();
				$('#uploadprogressbar').progressbar({value:0});
				$('#uploadprogressbar').fadeIn();
			});
			fileupload.on('fileuploadprogress', function(e, data) {
				OC.Upload.log('progress handle fileuploadprogress', e, data);
				//TODO progressbar in row
			});
			fileupload.on('fileuploadprogressall', function(e, data) {
				OC.Upload.log('progress handle fileuploadprogressall', e, data);
				var progress = (data.loaded / data.total) * 100;
				$('#uploadprogressbar').progressbar('value', progress);
			});
			fileupload.on('fileuploadstop', function(e, data) {
				OC.Upload.log('progress handle fileuploadstop', e, data);
				
				$('#uploadprogresswrapper input.stop').fadeOut();
				$('#uploadprogressbar').fadeOut();
				
			});
			fileupload.on('fileuploadfail', function(e, data) {
				OC.Upload.log('progress handle fileuploadfail', e, data);
				//if user pressed cancel hide upload progress bar and cancel button
				if (data.errorThrown === 'abort') {
					$('#uploadprogresswrapper input.stop').fadeOut();
					$('#uploadprogressbar').fadeOut();
				}
			});

		} else {
			console.log('skipping file progress because your browser is broken');
		}
	}

	$.assocArraySize = function(obj) {
		// http://stackoverflow.com/a/6700/11236
		var size = 0, key;
		for (key in obj) {
			if (obj.hasOwnProperty(key)) size++;
		}
		return size;
	};

	// warn user not to leave the page while upload is in progress
	$(window).on('beforeunload', function(e) {
		if (OC.Upload.isProcessing()) {
			return t('files', 'File upload is in progress. Leaving the page now will cancel the upload.');
		}
	});

	//add multiply file upload attribute to all browsers except konqueror (which crashes when it's used)
	if(navigator.userAgent.search(/konqueror/i)==-1){
		$('#file_upload_start').attr('multiple','multiple');
	}

	//if the breadcrumb is to long, start by replacing foldernames with '...' except for the current folder
	var crumb=$('div.crumb').first();
	while($('div.controls').height()>40 && crumb.next('div.crumb').length>0){
		crumb.children('a').text('...');
		crumb=crumb.next('div.crumb');
	}
	//if that isn't enough, start removing items from the breacrumb except for the current folder and it's parent
	var crumb=$('div.crumb').first();
	var next=crumb.next('div.crumb');
	while($('div.controls').height()>40 && next.next('div.crumb').length>0){
		crumb.remove();
		crumb=next;
		next=crumb.next('div.crumb');
	}
	//still not enough, start shorting down the current folder name
	var crumb=$('div.crumb>a').last();
	while($('div.controls').height()>40 && crumb.text().length>6){
		var text=crumb.text()
		text=text.substr(0,text.length-6)+'...';
		crumb.text(text);
	}

	$(document).click(function(){
		$('#new>ul').hide();
		$('#new').removeClass('active');
		$('#new li').each(function(i,element){
			if($(element).children('p').length==0){
				$(element).children('form').remove();
				$(element).append('<p>'+$(element).data('text')+'</p>');
			}
		});
	});
	$('#new').click(function(event){
		event.stopPropagation();
	});
	$('#new>a').click(function(){
		$('#new>ul').toggle();
		$('#new').toggleClass('active');
	});
	$('#new li').click(function(){
		if($(this).children('p').length==0){
			return;
		}

		$('#new li').each(function(i,element){
			if($(element).children('p').length==0){
				$(element).children('form').remove();
				$(element).append('<p>'+$(element).data('text')+'</p>');
			}
		});

		var type=$(this).data('type');
		var text=$(this).children('p').text();
		$(this).data('text',text);
		$(this).children('p').remove();
		var form=$('<form></form>');
		var input=$('<input type="text">');
		form.append(input);
		$(this).append(form);
		input.focus();
		form.submit(function(event){
			event.stopPropagation();
			event.preventDefault();
			var newname=input.val();
			if(type == 'web' && newname.length == 0) {
				OC.Notification.show(t('files', 'URL cannot be empty.'));
				return false;
			} else if (type != 'web' && !Files.isFileNameValid(newname)) {
				return false;
			} else if( type == 'folder' && $('#dir').val() == '/' && newname == 'Shared') {
				OC.Notification.show(t('files','Invalid folder name. Usage of \'Shared\' is reserved by ownCloud'));
				return false;
			}
			if (FileList.lastAction) {
				FileList.lastAction();
			}
			var name = getUniqueName(newname);
			if (newname != name) {
				FileList.checkName(name, newname, true);
				var hidden = true;
			} else {
				var hidden = false;
			}
			switch(type){
				case 'file':
					$.post(
						OC.filePath('files','ajax','newfile.php'),
						{dir:$('#dir').val(),filename:name},
						function(result){
							if (result.status == 'success') {
								var date=new Date();
								FileList.addFile(name,0,date,false,hidden);
								var tr=$('tr').filterAttr('data-file',name);
								tr.attr('data-size',result.data.size);
								tr.attr('data-mime',result.data.mime);
								tr.attr('data-id', result.data.id);
								tr.find('.filesize').text(humanFileSize(result.data.size));
								var path = getPathForPreview(name);
								lazyLoadPreview(path, result.data.mime, function(previewpath){
									tr.find('td.filename').attr('style','background-image:url('+previewpath+')');
								});
							} else {
								OC.dialogs.alert(result.data.message, t('core', 'Error'));
							}
						}
					);
					break;
				case 'folder':
					$.post(
						OC.filePath('files','ajax','newfolder.php'),
						{dir:$('#dir').val(),foldername:name},
						function(result){
							if (result.status == 'success') {
								var date=new Date();
								FileList.addDir(name,0,date,hidden);
								var tr=$('tr').filterAttr('data-file',name);
								tr.attr('data-id', result.data.id);
							} else {
								OC.dialogs.alert(result.data.message, t('core', 'Error'));
							}
						}
					);
					break;
				case 'web':
					if(name.substr(0,8)!='https://' && name.substr(0,7)!='http://'){
						name='http://'+name;
					}
					var localName=name;
					if(localName.substr(localName.length-1,1)=='/'){//strip /
						localName=localName.substr(0,localName.length-1)
					}
					if(localName.indexOf('/')){//use last part of url
						localName=localName.split('/').pop();
					} else { //or the domain
						localName=(localName.match(/:\/\/(.[^\/]+)/)[1]).replace('www.','');
					}
					localName = getUniqueName(localName);
					//IE < 10 does not fire the necessary events for the progress bar.
					if($('html.lte9').length === 0) {
						$('#uploadprogressbar').progressbar({value:0});
						$('#uploadprogressbar').fadeIn();
					}

					var eventSource=new OC.EventSource(OC.filePath('files','ajax','newfile.php'),{dir:$('#dir').val(),source:name,filename:localName});
					eventSource.listen('progress',function(progress){
						//IE < 10 does not fire the necessary events for the progress bar.
						if($('html.lte9').length === 0) {
							$('#uploadprogressbar').progressbar('value',progress);
						}
					});
					eventSource.listen('success',function(data){
						var mime=data.mime;
						var size=data.size;
						var id=data.id;
						$('#uploadprogressbar').fadeOut();
						var date=new Date();
						FileList.addFile(localName,size,date,false,hidden);
						var tr=$('tr').filterAttr('data-file',localName);
						tr.data('mime',mime).data('id',id);
						tr.attr('data-id', id);
						var path = $('#dir').val()+'/'+localName;
						lazyLoadPreview(path, mime, function(previewpath){
							tr.find('td.filename').attr('style','background-image:url('+previewpath+')');
						});
					});
					eventSource.listen('error',function(error){
						$('#uploadprogressbar').fadeOut();
						alert(error);
					});
					break;
			}
			var li=form.parent();
			form.remove();
			/* workaround for IE 9&10 click event trap, 2 lines: */
			$('input').first().focus();
			$('#content').focus();
			li.append('<p>'+li.data('text')+'</p>');
			$('#new>a').click();
		});
	});
	window.file_upload_param = file_upload_param;
});