/**
 * 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: [],
	/**
	 * 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);
		if (data.data) {
			data.data.append('resolution', 'replace');
		} else {
			data.formData.push({name:'resolution', value:'replace'}); //hack for ie8
		}
		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];
				try {
					// FIXME: not so elegant... need to refactor that method to return a value
					Files.isFileNameValid(file.name);
				}
				catch (errorMessage) {
					data.textStatus = 'invalidcharacters';
					data.errorThrown = errorMessage;
				}
			
				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: $('#dir').val()
					};
				}
			},
			fail: function(e, data) {
				OC.Upload.log('fail', e, data);
				if (typeof data.textStatus !== 'undefined' && data.textStatus !== 'success' ) {
					if (data.textStatus === 'abort') {
						OC.Notification.show(t('files', 'Upload cancelled.'));
					} else {
						// HTTP connection problem
						OC.Notification.show(data.errorThrown);
					}
					//hide notification after 10 sec
					setTimeout(function() {
						OC.Notification.hide();
					}, 10000);
				}
				OC.Upload.deleteUpload(data);
			},
			/**
			 * called for every successful upload
			 * @param {object} e
			 * @param {object} data
			 */
			done:function(e, data) {
				OC.Upload.log('done', e, data);
				// handle different responses (json or body from iframe for ie)
				var response;
				if (typeof data.result === 'string') {
					response = data.result;
				} else {
					//fetch response from iframe
					response = data.result[0].body.innerText;
				}
				var result=$.parseJSON(response);

				delete data.jqXHR;

				if (result.status === 'error' && result.data && result.data.message){
					data.textStatus = 'servererror';
					data.errorThrown = result.data.message;
					var fu = $(this).data('blueimp-fileupload') || $(this).data('fileupload');
					fu._trigger('fail', e, data);
				} else 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[0].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();
			    Files.updateStorageStatistics();
			});
			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);
	}

	$(document).click(function(ev) {
		// do not close when clicking in the dropdown
		if ($(ev.target).closest('#new').length){
			return;
		}
		$('#new>ul').hide();
		$('#new').removeClass('active');
		if ($('#new .error').length > 0) {
			$('#new .error').tipsy('hide');
		}
		$('#new li').each(function(i,element) {
			if ($(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 .error').tipsy('hide');

		$('#new li').each(function(i,element) {
			if ($(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();
		
		// add input field
		var form = $('<form></form>');
		var input = $('<input type="text">');
		var newName = $(this).attr('data-newname') || '';
		if (newName) {
			input.val(newName);
		}
		form.append(input);
		$(this).append(form);
		var lastPos;
		var checkInput = function () {
			var filename = input.val();
			if (type === 'web' && filename.length === 0) {
				throw t('files', 'URL cannot be empty');
			} else if (type !== 'web' && !Files.isFileNameValid(filename)) {
				// Files.isFileNameValid(filename) throws an exception itself
			} else if ($('#dir').val() === '/' && filename === 'Shared') {
				throw t('files', 'In the home folder \'Shared\' is a reserved filename');
			} else if (FileList.inList(filename)) {
				throw t('files', '{new_name} already exists', {new_name: filename});
			} else {
				return true;
			}
		};

		// verify filename on typing
		input.keyup(function(event) {
			try {
				checkInput();
				input.tipsy('hide');
				input.removeClass('error');
			} catch (error) {
				input.attr('title', error);
				input.tipsy({gravity: 'w', trigger: 'manual'});
				input.tipsy('show');
				input.addClass('error');
			}
		});

		input.focus();
		// pre select name up to the extension
		lastPos = newName.lastIndexOf('.');
		if (lastPos === -1) {
			lastPos = newName.length;
		}
		input.selectRange(0, lastPos);
		form.submit(function(event) {
			event.stopPropagation();
			event.preventDefault();
			try {
				checkInput();
				var newname = input.val();
				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();
									// TODO: ideally addFile should be able to receive
									// all attributes and set them automatically,
									// and also auto-load the preview
									var tr = FileList.addFile(name, 0, date, false, hidden);
									tr.attr('data-size', result.data.size);
									tr.attr('data-mime', result.data.mime);
									tr.attr('data-id', result.data.id);
									tr.attr('data-etag', result.data.etag);
									tr.find('.filesize').text(humanFileSize(result.data.size));
									var path = getPathForPreview(name);
									Files.lazyLoadPreview(path, result.data.mime, function(previewpath) {
										tr.find('td.filename').attr('style','background-image:url('+previewpath+')');
									}, null, null, result.data.etag);
									FileActions.display(tr.find('td.filename'), true);
								} else {
									OC.dialogs.alert(result.data.message, t('core', 'Could not create file'));
								}
							}
						);
						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 = FileList.findFileEl(name);
									tr.attr('data-id', result.data.id);
								} else {
									OC.dialogs.alert(result.data.message, t('core', 'Could not create folder'));
								}
							}
						);
						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 = FileList.findFileEl(localName);
							tr.data('mime', mime).data('id', id);
							tr.attr('data-id', id);
							var path = $('#dir').val()+'/'+localName;
							Files.lazyLoadPreview(path, mime, function(previewpath) {
								tr.find('td.filename').attr('style', 'background-image:url('+previewpath+')');
							}, null, null, data.etag);
							FileActions.display(tr.find('td.filename'), true);
						});
						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();
			} catch (error) {
				input.attr('title', error);
				input.tipsy({gravity: 'w', trigger: 'manual'});
				input.tipsy('show');
				input.addClass('error');
			}
		});
	});
	window.file_upload_param = file_upload_param;
});
