/* FileSaver.js
  * A saveAs() FileSaver implementation.
  * 2013-10-21
  *
  * By Eli Grey, http://eligrey.com
  * License: X11/MIT
  *   See LICENSE.md
  */
 
 /*global self */
 /*jslint bitwise: true, regexp: true, confusion: true, es5: true, vars: true, white: true,
   plusplus: true */
 
 /*! @source http://purl.eligrey.com/github/FileSaver.js/blob/master/FileSaver.js */
 
 var saveAs = saveAs
   || (typeof navigator !== 'undefined' && navigator.msSaveOrOpenBlob && navigator.msSaveOrOpenBlob.bind(navigator))
   || (function(view) {
 	"use strict";
 	var
 		  doc = view.document
 		  // only get URL when necessary in case BlobBuilder.js hasn't overridden it yet
 		, get_URL = function() {
 			return view.URL || view.webkitURL || view;
 		}
 		, URL = view.URL || view.webkitURL || view
 		, save_link = doc.createElementNS("http://www.w3.org/1999/xhtml", "a")
 		, can_use_save_link =  !view.externalHost && "download" in save_link
 		, click = function(node) {
 			var event = doc.createEvent("MouseEvents");
 			event.initMouseEvent(
 				"click", true, false, view, 0, 0, 0, 0, 0
 				, false, false, false, false, 0, null
 			);
 			node.dispatchEvent(event);
 		}
 		, webkit_req_fs = view.webkitRequestFileSystem
 		, req_fs = view.requestFileSystem || webkit_req_fs || view.mozRequestFileSystem
 		, throw_outside = function (ex) {
 			(view.setImmediate || view.setTimeout)(function() {
 				throw ex;
 			}, 0);
 		}
 		, force_saveable_type = "application/octet-stream"
 		, fs_min_size = 0
 		, deletion_queue = []
 		, process_deletion_queue = function() {
 			var i = deletion_queue.length;
 			while (i--) {
 				var file = deletion_queue[i];
 				if (typeof file === "string") { // file is an object URL
 					URL.revokeObjectURL(file);
 				} else { // file is a File
 					file.remove();
 				}
 			}
 			deletion_queue.length = 0; // clear queue
 		}
 		, dispatch = function(filesaver, event_types, event) {
 			event_types = [].concat(event_types);
 			var i = event_types.length;
 			while (i--) {
 				var listener = filesaver["on" + event_types[i]];
 				if (typeof listener === "function") {
 					try {
 						listener.call(filesaver, event || filesaver);
 					} catch (ex) {
 						throw_outside(ex);
 					}
 				}
 			}
 		}
 		, FileSaver = function(blob, name) {
 			// First try a.download, then web filesystem, then object URLs
 			var
 				  filesaver = this
 				, type = blob.type
 				, blob_changed = false
 				, object_url
 				, target_view
 				, get_object_url = function() {
 					var object_url = get_URL().createObjectURL(blob);
 					deletion_queue.push(object_url);
 					return object_url;
 				}
 				, dispatch_all = function() {
 					dispatch(filesaver, "writestart progress write writeend".split(" "));
 				}
 				// on any filesys errors revert to saving with object URLs
 				, fs_error = function() {
 					// don't create more object URLs than needed
 					if (blob_changed || !object_url) {
 						object_url = get_object_url(blob);
 					}
 					if (target_view) {
 						target_view.location.href = object_url;
 					} else {
                         window.open(object_url, "_blank");
                     }
 					filesaver.readyState = filesaver.DONE;
 					dispatch_all();
 				}
 				, abortable = function(func) {
 					return function() {
 						if (filesaver.readyState !== filesaver.DONE) {
 							return func.apply(this, arguments);
 						}
 					};
 				}
 				, create_if_not_found = {create: true, exclusive: false}
 				, slice
 			;
 			filesaver.readyState = filesaver.INIT;
 			if (!name) {
 				name = "download";
 			}
 			if (can_use_save_link) {
 				object_url = get_object_url(blob);
 				// FF for Android has a nasty garbage collection mechanism
 				// that turns all objects that are not pure javascript into 'deadObject'
 				// this means `doc` and `save_link` are unusable and need to be recreated
 				// `view` is usable though:
 				doc = view.document;
 				save_link = doc.createElementNS("http://www.w3.org/1999/xhtml", "a");
 				save_link.href = object_url;
 				save_link.download = name;
 				var event = doc.createEvent("MouseEvents");
 				event.initMouseEvent(
 					"click", true, false, view, 0, 0, 0, 0, 0
 					, false, false, false, false, 0, null
 				);
 				save_link.dispatchEvent(event);
 				filesaver.readyState = filesaver.DONE;
 				dispatch_all();
 				return;
 			}
 			// Object and web filesystem URLs have a problem saving in Google Chrome when
 			// viewed in a tab, so I force save with application/octet-stream
 			// http://code.google.com/p/chromium/issues/detail?id=91158
 			if (view.chrome && type && type !== force_saveable_type) {
 				slice = blob.slice || blob.webkitSlice;
 				blob = slice.call(blob, 0, blob.size, force_saveable_type);
 				blob_changed = true;
 			}
 			// Since I can't be sure that the guessed media type will trigger a download
 			// in WebKit, I append .download to the filename.
 			// https://bugs.webkit.org/show_bug.cgi?id=65440
 			if (webkit_req_fs && name !== "download") {
 				name += ".download";
 			}
 			if (type === force_saveable_type || webkit_req_fs) {
 				target_view = view;
 			}
 			if (!req_fs) {
 				fs_error();
 				return;
 			}
 			fs_min_size += blob.size;
 			req_fs(view.TEMPORARY, fs_min_size, abortable(function(fs) {
 				fs.root.getDirectory("saved", create_if_not_found, abortable(function(dir) {
 					var save = function() {
 						dir.getFile(name, create_if_not_found, abortable(function(file) {
 							file.createWriter(abortable(function(writer) {
 								writer.onwriteend = function(event) {
 									target_view.location.href = file.toURL();
 									deletion_queue.push(file);
 									filesaver.readyState = filesaver.DONE;
 									dispatch(filesaver, "writeend", event);
 								};
 								writer.onerror = function() {
 									var error = writer.error;
 									if (error.code !== error.ABORT_ERR) {
 										fs_error();
 									}
 								};
 								"writestart progress write abort".split(" ").forEach(function(event) {
 									writer["on" + event] = filesaver["on" + event];
 								});
 								writer.write(blob);
 								filesaver.abort = function() {
 									writer.abort();
 									filesaver.readyState = filesaver.DONE;
 								};
 								filesaver.readyState = filesaver.WRITING;
 							}), fs_error);
 						}), fs_error);
 					};
 					dir.getFile(name, {create: false}, abortable(function(file) {
 						// delete file if it already exists
 						file.remove();
 						save();
 					}), abortable(function(ex) {
 						if (ex.code === ex.NOT_FOUND_ERR) {
 							save();
 						} else {
 							fs_error();
 						}
 					}));
 				}), fs_error);
 			}), fs_error);
 		}
 		, FS_proto = FileSaver.prototype
 		, saveAs = function(blob, name) {
 			return new FileSaver(blob, name);
 		}
 	;
 	FS_proto.abort = function() {
 		var filesaver = this;
 		filesaver.readyState = filesaver.DONE;
 		dispatch(filesaver, "abort");
 	};
 	FS_proto.readyState = FS_proto.INIT = 0;
 	FS_proto.WRITING = 1;
 	FS_proto.DONE = 2;
 
 	FS_proto.error =
 	FS_proto.onwritestart =
 	FS_proto.onprogress =
 	FS_proto.onwrite =
 	FS_proto.onabort =
 	FS_proto.onerror =
 	FS_proto.onwriteend =
 		null;
 
 	view.addEventListener("unload", process_deletion_queue, false);
 	return saveAs;
 }(this.self || this.window || this.content));
 // `self` is undefined in Firefox for Android content script context
 // while `this` is nsIContentFrameMessageManager
 // with an attribute `content` that corresponds to the window
 
 if (typeof module !== 'undefined') module.exports = saveAs;

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