/* FileSaver.js
 * A saveAs() FileSaver implementation.
 * 2015-03-04
 *
 * By Eli Grey, http://eligrey.com
 * License: X11/MIT
 *   See https://github.com/eligrey/FileSaver.js/blob/master/LICENSE.md
 */

/*global self */
/*jslint bitwise: true, indent: 4, laxbreak: true, laxcomma: true, smarttabs: true, plusplus: true */

/*! @source http://purl.eligrey.com/github/FileSaver.js/blob/master/FileSaver.js */

var saveAs = saveAs
  // IE 10+ (native saveAs)
  || (typeof navigator !== "undefined" &&
      navigator.msSaveOrOpenBlob && navigator.msSaveOrOpenBlob.bind(navigator))
  // Everyone else
  || (function(view) {
    "use strict";
    // IE <10 is explicitly unsupported
    if (typeof navigator !== "undefined" &&
        /MSIE [1-9]\./.test(navigator.userAgent)) {
        return;
    }
    var
          doc = view.document
          // only get URL when necessary in case Blob.js hasn't overridden it yet
        , get_URL = function() {
            return view.URL || view.webkitURL || view;
        }
        , save_link = doc.createElementNS("http://www.w3.org/1999/xhtml", "a")
        , can_use_save_link = "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
        // See https://code.google.com/p/chromium/issues/detail?id=375297#c7 and
        // https://github.com/eligrey/FileSaver.js/commit/485930a#commitcomment-8768047
        // for the reasoning behind the timeout and revocation flow
        , arbitrary_revoke_timeout = 500 // in ms
        , revoke = function(file) {
            var revoker = function() {
                if (typeof file === "string") { // file is an object URL
                    get_URL().revokeObjectURL(file);
                } else { // file is a File
                    file.remove();
                }
            };
            if (view.chrome) {
                revoker();
            } else {
                setTimeout(revoker, arbitrary_revoke_timeout);
            }
        }
        , 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
                , 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_URL().createObjectURL(blob);
                    }
                    if (target_view) {
                        target_view.location.href = object_url;
                    } else {
                        var new_tab = view.open(object_url, "_blank");
                        if (new_tab == undefined && typeof safari !== "undefined") {
                            //Apple do not allow window.open, see http://bit.ly/1kZffRI
                            view.location.href = object_url
                        }
                    }
                    filesaver.readyState = filesaver.DONE;
                    dispatch_all();
                    revoke(object_url);
                }
                , 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_URL().createObjectURL(blob);
                save_link.href = object_url;
                save_link.download = name;
                click(save_link);
                filesaver.readyState = filesaver.DONE;
                dispatch_all();
                revoke(object_url);
                return;
            }
            // prepend BOM for UTF-8 XML and text/plain types
            if (/^\s*(?:text\/(?:plain|xml)|application\/xml|\S*\/\S*\+xml)\s*;.*charset\s*=\s*utf-8/i.test(blob.type)) {
                blob = new Blob(["\ufeff", blob], {type: blob.type});
            }
            // 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
            // Update: Google errantly closed 91158, I submitted it again:
            // https://code.google.com/p/chromium/issues/detail?id=389642
            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();
                                    filesaver.readyState = filesaver.DONE;
                                    dispatch(filesaver, "writeend", event);
                                    revoke(file);
                                };
                                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;

    return saveAs;
}(
       typeof self !== "undefined" && self
    || typeof window !== "undefined" && 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) {
  module.exports.saveAs = saveAs;
} else if ((typeof define !== "undefined" && define !== null) && (define.amd != null)) {
  define([], function() {
    return saveAs;
  });
}
