/*

Copyright 2008-2011 Clipperz Srl

This file is part of Clipperz Community Edition.
Clipperz Community Edition is an online password manager.
For further information about its features and functionalities please
refer to http://www.clipperz.com.

* Clipperz Community Edition is free software: you can redistribute
  it and/or modify it under the terms of the GNU Affero General Public
  License as published by the Free Software Foundation, either version
  3 of the License, or (at your option) any later version.

* Clipperz Community Edition is distributed in the hope that it will
  be useful, but WITHOUT ANY WARRANTY; without even the implied
  warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  See the GNU Affero General Public License for more details.

* You should have received a copy of the GNU Affero General Public
  License along with Clipperz Community Edition.  If not, see
  <http://www.gnu.org/licenses/>.

*/

try { if (typeof(Clipperz.KeyValueObjectStore) == 'undefined') { throw ""; }} catch (e) {
	throw "Clipperz.PM.DataModel.EncryptedRemoteObject depends on Clipperz.KeyValueObjectStore!";
}  

if (typeof(Clipperz.PM) == 'undefined') { Clipperz.PM = {}; }
if (typeof(Clipperz.PM.DataModel) == 'undefined') { Clipperz.PM.DataModel = {}; }

Clipperz.PM.DataModel.EncryptedRemoteObject = function(args) {
	args = args || {};

	this._name = args.name || null;
	this._reference = args.reference || Clipperz.PM.Crypto.randomKey();
	this._isBrandNew = ((args.reference == null) && (args.remoteData == null));

	if ((this._isBrandNew == false) && (args['retrieveKeyFunction'] == null)) {
		Clipperz.Base.exception.raise('MandatoryParameter');
	} else {
		this._retrieveKeyFunction = args['retrieveKeyFunction'];
	}

	this._retrieveRemoteDataFunction	= args.retrieveRemoteDataFunction	|| null;
	this._remoteData					= args.remoteData					|| null;
//	this._remoteData					= args.remoteData ? Clipperz.Base.deepClone(args.remoteData) : null;
	if ((!this._isBrandNew) && ((this._retrieveRemoteDataFunction == null) && (this._remoteData == null))) {
		Clipperz.Base.exception.raise('MandatoryParameter');
	}


	this._encryptedDataKeypath			= args.encryptedDataKeypath			|| 'data';		//Clipperz.Base.exception.raise('MandatoryParameter');
	this._encryptedVersionKeypath		= args.encryptedVersionKeypath		|| 'version';	//Clipperz.Base.exception.raise('MandatoryParameter');

	
	this._transientState = null;
	this._deferredLocks = {};

	if (this._isBrandNew == true) {
		this._objectDataStore = new Clipperz.KeyValueObjectStore(/*{'name':'EncryptedRemoteObject.objectDataStore [1]'}*/);
	} else {
		this._objectDataStore = null;
	}

	return this;
}

//
//	  Basic data workflow
//	=======================
//
//	getRemoteData
//		unpackRemoteData
//			getDecryptData [encryptedDataKeypath, encryptedVersionKeypath]
//				unpackData
//				
//				
//	??			packData
//	??		encryptDataWithKey
//	??	packRemoteData [encryptedDataKeypath (?), encryptedVersionKeypath (?)]
//

Clipperz.PM.DataModel.EncryptedRemoteObject.prototype = MochiKit.Base.update(null, {

	'toString': function () {
		return "Clipperz.PM.DataModel.EncryptedRemoteObject" + (this.name() != null ? " - " + this.name() : "");
	},

	//-------------------------------------------------------------------------

	'name': function () {
		return this._name;
	},

	//-------------------------------------------------------------------------

	'reference': function () {
		return this._reference;
	},

	'setReference': function (aValue) {
		this._reference = aValue;

		return this._reference;
	},

	//-------------------------------------------------------------------------

	'transientState': function () {
		if (this._transientState == null) {
			this._transientState = new Clipperz.KeyValueObjectStore(/*{'name':'EncryptedRemoteObject.transientState [2]'}*/);
		}
		
		return this._transientState;
	},

	'resetTransientState': function (isCommitting) {
		if (this._transientState != null) {
			this._transientState.removeAllData();
		}

		this._transientState = null;
	},

	//-------------------------------------------------------------------------

	'isBrandNew': function () {
		return this._isBrandNew;
	},

	//-------------------------------------------------------------------------

	'getKey': function () {
		var deferredResult;
		var deferredLock;

		deferredLock = this.getDeferredLockForKey('key');

		deferredResult = new Clipperz.Async.Deferred("EncryptedRemoteObject.getKey", {trace:false});
		deferredResult.acquireLock(deferredLock);
		deferredResult.addMethod(
			this.decryptedDataStore(),
			'deferredGetOrSet',
			'decryptionKey',
			MochiKit.Base.partial(this.retrieveKeyFunction(), this.reference())
		);
		deferredResult.releaseLock(deferredLock);
		deferredResult.callback();
		
		return deferredResult;
	},

	// . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

	'retrieveKeyFunction': function () {
		return this._retrieveKeyFunction;
	},

	'setRetrieveKeyFunction': function (aFunction) {
		this._retrieveKeyFunction = aFunction;
	},

	//-------------------------------------------------------------------------

	'hasLoadedRemoteData': function () {
		return (this._remoteData != null);
	},

	'getRemoteData': function () {
		var deferredResult;
		var	deferredLock;
		
		deferredLock = this.getDeferredLockForKey('remoteData');

		deferredResult = new Clipperz.Async.Deferred("EncryptedRemoteObjects.getRemoteData", {trace:false});
		deferredResult.acquireLock(deferredLock);
		deferredResult.addCallback(MochiKit.Base.bind(function () {
			var innerDeferredResult;
			
			if (this._remoteData != null) {
				innerDeferredResult = MochiKit.Async.succeed(this._remoteData);
			} else {
				innerDeferredResult = Clipperz.Async.callbacks("EncryptedRemoteObjects.getRemoteData <inner deferred>", [
					MochiKit.Base.partial(this.retrieveRemoteDataFunction(), this.reference()),
					MochiKit.Base.method(this, 'unpackRemoteData'),
					MochiKit.Base.bind(function (someData) {
						this._remoteData = someData;
						return this._remoteData;
					}, this)
				], {trace:false});
			}

			return innerDeferredResult;
		}, this))
		deferredResult.addCallbackPass(MochiKit.Signal.signal, Clipperz.Signal.NotificationCenter, 'advanceProgress');
		deferredResult.releaseLock(deferredLock);
		
		deferredResult.callback();
		
		return deferredResult;
	},

	//-------------------------------------------------------------------------

	'unpackRemoteData': function (someData) {
		return MochiKit.Async.succeed(someData);
	},

	//.........................................................................

	'packRemoteData': function (someData) {
		var result;
		
		result = {
			'reference':	this.reference(),
			'data':			someData,
			'version':		Clipperz.PM.Crypto.encryptingFunctions.currentVersion
		};

		return MochiKit.Async.succeed(result);
	},

	//-------------------------------------------------------------------------

	'retrieveRemoteDataFunction': function () {
		return this._retrieveRemoteDataFunction;
	},
	
	'setRetrieveRemoteDataFunction': function (aFunction) {
		this._retrieveRemoteDataFunction = aFunction;
	},

	//-------------------------------------------------------------------------

	'decryptedDataStore': function () {
		if (this._decryptedDataStore == null) {
			this._decryptedDataStore = new Clipperz.KeyValueObjectStore(/*{'name':'EncryptedRemoteObject.decryptedDataStore [3]'}*/);
		};
		
		return this._decryptedDataStore;
	},

	//.........................................................................

	'getDecryptedData': function () {
		var deferredResult;
		var deferredLock;
		
		deferredLock = this.getDeferredLockForKey('decryptedData');

		deferredResult = new Clipperz.Async.Deferred("EncryptedRemoteObject.getDecryptedData", {trace:false});
		deferredResult.acquireLock(deferredLock);
		deferredResult.addMethod(this, 'decryptedDataStore');
		deferredResult.addCallback(MochiKit.Base.methodcaller('deferredGetOrSet', 'decryptedData', MochiKit.Base.bind(function () {
			var	innerDeferredResult;

			innerDeferredResult = new Clipperz.Async.Deferred("EncryptedRemoteObject.getDecryptedData <inner deferred>", {trace:false});

			innerDeferredResult.addMethod(this, 'getRemoteData');
			innerDeferredResult.addCallbackPass(MochiKit.Signal.signal, Clipperz.Signal.NotificationCenter, 'advanceProgress');
			innerDeferredResult.collectResults({
				'key':		MochiKit.Base.method(this, 'getKey'),
				'value':	MochiKit.Base.itemgetter(this._encryptedDataKeypath),
				'version':	MochiKit.Base.itemgetter(this._encryptedVersionKeypath)
			});

			innerDeferredResult.addCallback(Clipperz.PM.Crypto.deferredDecrypt);
			innerDeferredResult.addCallbackPass(MochiKit.Signal.signal, Clipperz.Signal.NotificationCenter, 'advanceProgress');
			innerDeferredResult.addMethod(this, 'unpackData');
			innerDeferredResult.callback();
		
			return innerDeferredResult;
		}, this)));
		deferredResult.releaseLock(deferredLock);
		deferredResult.addCallbackPass(MochiKit.Signal.signal, Clipperz.Signal.NotificationCenter, 'advanceProgress');
		deferredResult.callback();
		
		return deferredResult;
	},

	//-------------------------------------------------------------------------

	'setValue': function(aKey, aValue) {
		var deferredResult;
		
		deferredResult = new Clipperz.Async.Deferred("EncryptedRemoteObject.setValue", {trace:false});
		deferredResult.addMethod(this, '_getObjectDataStore');
		deferredResult.addCallback(MochiKit.Base.methodcaller('setValue', aKey, aValue));
		deferredResult.callback();
		
		return deferredResult;
	},

	//.........................................................................

	'getValue': function (aKey) {
		return Clipperz.Async.callbacks("EncryptedRemoteObject.getValue", [
			MochiKit.Base.method(this, '_getObjectDataStore'),
			MochiKit.Base.methodcaller('getValue', aKey)
		], {trace:false});
	},

	//.........................................................................

	'removeValue': function (aKey) {
		return Clipperz.Async.callbacks("EncryptedRemoteObject.removeValue", [
			MochiKit.Base.method(this, '_getObjectDataStore'),
			MochiKit.Base.methodcaller('removeValue', aKey)
		], {trace:false});
	},
	
	//.........................................................................

	'values': function () {
		return Clipperz.Async.callbacks("EncryptedRemoteObject.values", [
			MochiKit.Base.method(this, '_getObjectDataStore'),
			MochiKit.Base.methodcaller('values')
		], {trace:false});
	},

	'setValues': function (someValues) {
		return Clipperz.Async.callbacks("EncryptedRemoteObject.values", [
			MochiKit.Base.method(this, '_getObjectDataStore'),
			MochiKit.Base.methodcaller('setValues', someValues)
		], {trace:false});
	},
	
	//.........................................................................

	'_getObjectDataStore': function () {
		var deferredResult;
		var deferredLock;
		
		deferredLock = this.getDeferredLockForKey('objectDataStore');
		
		deferredResult = new Clipperz.Async.Deferred("EncryptedRemoteObject._getObjectDataStore", {trace:false});
		deferredResult.acquireLock(deferredLock);
		deferredResult.addCallback(MochiKit.Base.bind(function () {
			var innerDeferredResult;

			if (this._objectDataStore == null) {
				this._objectDataStore = new Clipperz.KeyValueObjectStore(/*{'name':'EncryptedRemoteObject.objectDataStore [4]'}*/);

				innerDeferredResult = new Clipperz.Async.Deferred("EncryptedRemoteObject._getObjectDataStore <inner deferred>", {trace:false});
				innerDeferredResult.addMethod(this, 'getDecryptedData');
				innerDeferredResult.addMethod(this._objectDataStore, 'initWithValues');
				innerDeferredResult.callback();
			} else {
				innerDeferredResult = MochiKit.Async.succeed(this._objectDataStore);
			}

			return innerDeferredResult;
		}, this));
		deferredResult.releaseLock(deferredLock);
		deferredResult.callback();
		
		return deferredResult;
	},
	
	'hasInitiatedObjectDataStore': function () {
		return (this._objectDataStore != null);
	},

	//-------------------------------------------------------------------------

	'getDeferredLockForKey': function (aKey) {
		var result;
		
		result = this._deferredLocks[aKey];
		
		if (typeof(result) == 'undefined') {
			result = new MochiKit.Async.DeferredLock();
			this._deferredLocks[aKey] = result;
		}
		
		return result;
	},

	//-------------------------------------------------------------------------

	'unpackData': function (someData) {	//	++
		return someData;
	},
	
	'packData': function (someData) {	//	++
		return someData;
	},

	//-------------------------------------------------------------------------
	
	'hasPendingChanges': function () {
		var deferredResult;
		var tempObj = this;

		if (this.isBrandNew()) {
//			deferredResult = MochiKit.Async.succeed(true);
			deferredResult = this.hasPendingChangesWhenBrandNew();
		} else if (this.hasInitiatedObjectDataStore()) {
			deferredResult = new Clipperz.Async.Deferred("EncryptedRemoteObject.hasPendingChanges", {trace:false});
			deferredResult.collectResults({
				'decryptedData': [
					MochiKit.Base.method(this, 'getDecryptedData'),
					Clipperz.Base.serializeJSON
				],
				'objectData': [
					MochiKit.Base.method(this, '_getObjectDataStore'),
					MochiKit.Base.methodcaller('values'),
					Clipperz.Base.serializeJSON
				]
			});
			deferredResult.addCallback(function (someValues) {
//if (someValues['decryptedData'] != someValues['objectData']) {
//	console.log("ORIGINAL DATA", '[[[' + someValues['decryptedData'] + ']]]');
//	console.log("CURRENT  DATA", '>>>' + someValues['objectData'] + '<<<');
//}
				return (someValues['decryptedData'] != someValues['objectData']);
			});
			deferredResult.callback();
		} else {
			deferredResult = MochiKit.Async.succeed(false);
		}

		return deferredResult;
	},

	'hasPendingChangesWhenBrandNew': function () {
		return MochiKit.Async.succeed(true);
	},

	//-------------------------------------------------------------------------

	'commitTransientState': function () {
		var deferredResult;

//		if (this.transientState().getValue('__prepareRemoteData') == true) {
		if (this.transientState().getValue('packedRemoteData') != null) {
			deferredResult = Clipperz.Async.callbacks("EncryptedRemoteObject.commitTransientState - prepareRemoteData", [
				MochiKit.Base.bind(function (someData) {
					this._remoteData = this.transientState().getValue('packedRemoteData');
				}, this),

				MochiKit.Base.method(this, '_getObjectDataStore'),
				MochiKit.Base.methodcaller('values'),
				Clipperz.Base.deepClone,
				MochiKit.Base.method(this.decryptedDataStore(), 'setValue', 'decryptedData'),

				MochiKit.Base.method(this, 'resetTransientState', true)
			], {trace:false});

		} else {
			deferredResult = Clipperz.Async.callbacks("EncryptedRemoteObject.commitTransientState - NO prepareRemoteData", [
				MochiKit.Base.method(this, 'resetTransientState', true)
			], {trace:false});
		}
		
		this._isBrandNew = false;

		return deferredResult;
	},
	
	//-------------------------------------------------------------------------

	'revertChanges': function () {
		if (this.hasInitiatedObjectDataStore()) {
			this._objectDataStore.removeAllData();
			this._objectDataStore = null;
		}
		this.resetTransientState(false);

		return MochiKit.Async.succeed();
	},

	//-------------------------------------------------------------------------

	'deleteAllCleanTextData': function () {
		var deferredResult;

		deferredResult = new Clipperz.Async.Deferred("EncryptedRemoteObject.deleteAllCleanTextData", {trace:false});

		deferredResult.addMethod(this, 'resetTransientState', false);

		deferredResult.acquireLock(this.getDeferredLockForKey('decryptedData'));
		deferredResult.addCallback(MochiKit.Base.bind(function () {
			if (this._decryptedDataStore != null) {
				this._decryptedDataStore.removeAllData();
			}
		}, this));
		deferredResult.releaseLock(this.getDeferredLockForKey('decryptedData'));
		
		deferredResult.acquireLock(this.getDeferredLockForKey('objectDataStore'));
		deferredResult.addCallback(MochiKit.Base.bind(function () {
			if (this._objectDataStore != null) {
				this._objectDataStore.removeAllData();
				this._objectDataStore = null;
			}
		}, this));
		deferredResult.releaseLock(this.getDeferredLockForKey('objectDataStore'));

		deferredResult.callback();
		
		return deferredResult;
	},

	//.........................................................................

	'hasAnyCleanTextData': function () {
		var result;
		
		result = false;
		
		result = result || (! this.decryptedDataStore().isEmpty());
		result = result || (! this.transientState().isEmpty());
		if (this.hasInitiatedObjectDataStore()) {
			result = result || (! this._objectDataStore.isEmpty());
		}

		return MochiKit.Async.succeed(result);
	},

	//-------------------------------------------------------------------------

	'prepareRemoteDataWithKey': function (aKey) {
		return Clipperz.Async.callbacks("EncryptedRemoteObject.prepareRemoteDataWithKey", [
//			MochiKit.Base.method(this.transientState(), 'setValue', '__prepareRemoteData', true),
			MochiKit.Base.method(this, '_getObjectDataStore'),
			MochiKit.Base.methodcaller('values'),
			MochiKit.Base.method(this, 'packData'),
			function (someData) {
				return Clipperz.PM.Crypto.deferredEncrypt({
					'key':		aKey,
					'value':	someData,
					'version':	Clipperz.PM.Crypto.encryptingFunctions.currentVersion
				})
			},
			MochiKit.Base.method(this, 'packRemoteData'),
			MochiKit.Base.method(this.transientState(), 'setValue', 'packedRemoteData'),
			function (someData) {
				MochiKit.Signal.signal(Clipperz.Signal.NotificationCenter, 'advanceProgress');
				return someData;
			}
		], {trace:false});
	},

	//-------------------------------------------------------------------------
	__syntaxFix__: "syntax fix"
});