/*\
title: $:/core/modules/savers/twedit.js
type: application/javascript
module-type: saver

Handles saving changes via the TWEdit iOS app

\*/
(function(){

/*jslint node: true, browser: true */
/*global $tw: false, netscape: false, Components: false */
"use strict";

var TWEditSaver = function(wiki) {
};

TWEditSaver.prototype.save = function(text,method,callback) {
	// Bail if we're not running under TWEdit
	if(typeof DeviceInfo !== "object") {
		return false;
	}
	// Get the pathname of this document
	var pathname = decodeURIComponent(document.location.pathname);
	// Strip any query or location part
	var p = pathname.indexOf("?");
	if(p !== -1) {
		pathname = pathname.substr(0,p);
	}
	p = pathname.indexOf("#");
	if(p !== -1) {
		pathname = pathname.substr(0,p);
	}
	// Remove the leading "/Documents" from path
	var prefix = "/Documents";
	if(pathname.indexOf(prefix) === 0) {
		pathname = pathname.substr(prefix.length);
	}
	// Error handler
	var errorHandler = function(event) {
		// Error
		callback($tw.language.getString("Error/SavingToTWEdit") + ": " + event.target.error.code);
	};
	// Get the file system
	window.requestFileSystem(LocalFileSystem.PERSISTENT,0,function(fileSystem) {
		// Now we've got the filesystem, get the fileEntry
		fileSystem.root.getFile(pathname, {create: true}, function(fileEntry) {
			// Now we've got the fileEntry, create the writer
			fileEntry.createWriter(function(writer) {
				writer.onerror = errorHandler;
				writer.onwrite = function() {
					callback(null);
				};
				writer.position = 0;
				writer.write(text);
			},errorHandler);
		}, errorHandler);
	}, errorHandler);
	return true;
};

/*
Information about this saver
*/
TWEditSaver.prototype.info = {
	name: "twedit",
	priority: 1600,
	capabilities: ["save", "autosave"]
};

/*
Static method that returns true if this saver is capable of working
*/
exports.canSave = function(wiki) {
	return true;
};

/*
Create an instance of this saver
*/
exports.create = function(wiki) {
	return new TWEditSaver(wiki);
};

/////////////////////////// Hack
// HACK: This ensures that TWEdit recognises us as a TiddlyWiki document
if($tw.browser) {
	window.version = {title: "TiddlyWiki"};
}

})();