var transactionControllers = angular.module('transactionControllers', ['ngResource']);

function amountToNumber(amount) {
	var number = amount.toString().replace(',', '.');
	if (number.charAt(0) !== '+' && number.charAt(0) !== '-') {
		number = '-' + number;
	}
	return number;
}

function numberToAmount(number) {
	var amount = number.toFixed(2).toString().replace('.', ',');
	if (amount.charAt(0) !== '-' && amount !== '0,00') {
		amount = "+" + amount;
	}
	return amount;
}

transactionControllers.controller('TransactionListCtrl', [ '$scope', '$routeParams', '$resource', '$q', '$uibModal', '$log', 'Transaction', function($scope, $routeParams, $resource, $q, $uibModal, $log, Transaction) {

	function refreshExpenses() {
		var accountUsers = $resource($scope.account._links.users.href).get();
		accountUsers.$promise.then(function(data) {
			$scope.accountUsers = accountUsers._embedded.users;
			
			// get outstandings (expenses and withdrawals) for all users of the account
			var promises = new Array($scope.accountUsers.length);
			for (i = 0; i < $scope.accountUsers.length; i++) {
				var resource = $resource('/transactions/search/outstandings', { accountId: $scope.account.id, userId: $scope.accountUsers[i].id }).get();
				promises[i] = resource.$promise;
			}
			
			$q.all(promises).then(function(data) {
				for (i = 0; i < data.length; i++) {
					$scope.accountUsers[i].outstandings = new Array(data[i]._embedded.transactions.length);
					$scope.accountUsers[i].outstandingSum = 0.0;
					
					for (j = 0; j < data[i]._embedded.transactions.length; j++) {
						
						$scope.accountUsers[i].outstandings[j] = new Object();
						
						$scope.accountUsers[i].outstandings[j].date = data[i]._embedded.transactions[j].date;
						$scope.accountUsers[i].outstandings[j].description = data[i]._embedded.transactions[j].description;
						
						$scope.accountUsers[i].outstandings[j].href = data[i]._embedded.transactions[j]._links.self.href;
						$scope.accountUsers[i].outstandings[j].category = data[i]._embedded.transactions[j].category.name;
						
						if ($scope.accountUsers[i].outstandings[j].category === 'Private Entnahme') { // magic strings ftw
							$scope.accountUsers[i].outstandingSum += data[i]._embedded.transactions[j].amount;
							$scope.accountUsers[i].outstandings[j].amount = numberToAmount(data[i]._embedded.transactions[j].amount);
						}
						else {
							$scope.accountUsers[i].outstandingSum -= data[i]._embedded.transactions[j].amount;
							$scope.accountUsers[i].outstandings[j].amount = numberToAmount(-data[i]._embedded.transactions[j].amount);
						}
					}
					
					$scope.accountUsers[i].outstandingAmount = numberToAmount($scope.accountUsers[i].outstandingSum);
				}
			});
		});
	}
	
	$scope.refreshList = function() {
		
		// reset form
		if ($scope.form) {
			$scope.form.$setPristine();
			$scope.form.$setUntouched();
		}
		
		$scope.transaction = {
			amount: undefined,
			date: new Date(),
			creditor: ""
		};
		
		if (typeof $scope.categories !== 'undefined') {
			$scope.transaction.category = $scope.categories[0];
		}
		
		// get recent transactions
		var transactions = $resource('/transactions/search/forAccount', { accountId: $scope.account.id, size: $scope.pageSize, sort: 'date,desc' }).get();
		transactions.$promise.then(function(data) {
			$scope.transactions = transactions._embedded.transactions;
			$scope.nextPageAvailable = (transactions.page.totalPages !== transactions.page.number + 1);
			$scope.prevPageAvailable = (transactions.page.number > 0);
			$scope.pageNumber = transactions.page.number;
			
			for (i = 0; i < $scope.transactions.length; i++) {
				$scope.transactions[i].amount = numberToAmount($scope.transactions[i].amount);
			}
		});
		
		refreshExpenses();
	}
	
	$scope.checkCategory = function() {
		
		var radioButtons = document.getElementsByName('expenseBy');
		var userLabels = document.getElementsByClassName('userLabel');
		
		// if this is selected to be a withdrawal, preselect the current user and lock the radio buttons
		if ($scope.transaction.category.name === 'Private Entnahme') {
			for (i = 0; i < userLabels.length; i++) {
				if (userLabels[i].innerHTML.indexOf($scope.userinfo.name) >= 0) {
					userLabels[i].getElementsByTagName('INPUT')[0].checked = true;
				}
			}
			for (i = 0; i < radioButtons.length; i++) {
				radioButtons[i].disabled = true;
			}
		}
		else {
			for (i = 0; i < radioButtons.length; i++) {
				radioButtons[i].disabled = false;
			}
			radioButtons[0].checked = true;
		}
	}
	
	$scope.initList = function() {
		$scope.pageSize = 20;
		
		var userinfo = $resource('/user').get();
		userinfo.$promise.then(function(data) {
			$scope.userid = userinfo.name;
			
			userinfo = $resource('/users/search/findByUsername', { username: $scope.userid }).get();
			userinfo.$promise.then(function(data) {
				$scope.userinfo = userinfo;
			});
			
			var accountInfo = $resource('/accounts/search/findByUserName', { username: $scope.userid }).get();
			accountInfo.$promise.then(function(data) {
				$scope.accounts = accountInfo._embedded.accounts;
				if ($scope.account == undefined) {
					$scope.account = $scope.accounts[0];
					if ($routeParams.account != undefined) {
						for (i = 0; i < $scope.accounts.length; i++) {
							if ($scope.accounts[i].name == $routeParams.account)
								$scope.account = $scope.accounts[i];
						}
					}  
				}
				
				var categories = $resource('/categories/search/listForAccount', { accountId: $scope.account.id }).get();
				categories.$promise.then(function(data) {
					$scope.categories = categories._embedded.categories;
					$scope.refreshList();
				});
			});
		});
	}
	
	$scope.submitTransaction = function() {
		if (document.getElementById('amountInput').value) {
			document.getElementById('transactionSubmit').disabled = true;
			$scope.waitingForSubmission = true;
			
			var newTransaction = new Transaction({
				"account" : $scope.account._links.self.href,
				"amount" : amountToNumber($scope.transaction.amount),
				"date" : $scope.transaction.date,
				"description" : $scope.transaction.description,
				"category" : $scope.transaction.category._links.self.href,
				"creditor" : $scope.transaction.creditor
			});
			
			newTransaction.$save(function(transaction) {
				document.getElementById('transactionSubmit').disabled = false;
				$scope.waitingForSubmission = false;
				$scope.refreshList();
				$scope.lastSubmission = newTransaction;
			});
		}
	}
	
	$scope.deleteLastSubmission = function() {
		var testTrns = $resource($scope.lastSubmission._links.self.href).delete(function() {
			$scope.lastSubmission = undefined;
			$scope.refreshList();
		});
	};
	
	$scope.moreTransactions = function() {
		if ($scope.nextPageAvailable) {
			$scope.pageNumber++;
			var transactions = $resource('/transactions/search/forAccount', { accountId: $scope.account.id, size: $scope.pageSize, sort: 'date,desc', page: $scope.pageNumber }).get();
			transactions.$promise.then(function(data) {
				for (i = 0; i < transactions._embedded.transactions.length; i++) {
					transactions._embedded.transactions[i].amount = numberToAmount(transactions._embedded.transactions[i].amount);
				}
				
				$scope.transactions = $scope.transactions.concat(transactions._embedded.transactions);
				$scope.nextPageAvailable = (transactions.page.totalPages !== transactions.page.number + 1);
				$scope.prevPageAvailable = (transactions.page.number > 0);
				$scope.pageNumber = transactions.page.number;
			});
		}
	};
	
	$scope.updateSuggestions = function(val) {
		var suggestions = $resource('/transactions/search/descriptions', { accountId: $scope.account.id, prefix: val.toLowerCase() }).get();
		return suggestions.$promise.then(function(data) {
			var newSuggestions = new Array(suggestions._embedded.transactions.length);
			for (i = 0; i < suggestions._embedded.transactions.length; i++) {
				newSuggestions[i] = suggestions._embedded.transactions[i].description;
			}
			return newSuggestions;
		});
	};
	
	$scope.openDetails = function(transaction) {
		var modalInstance = $uibModal.open({
			templateUrl: 'detailsTemplate.html',
			controller: 'DetailsModalCtrl',
			resolve: {
				transactionId: transaction.id,
				categories: function () {
			          return $scope.categories;
			        },
				accountUsers: function () {
			          return $scope.accountUsers;
		        }
			}
		});

		modalInstance.result.then(function(editedTransaction) {
			
			$scope.lastSubmission = undefined;
			
			if (editedTransaction.amount != undefined) {
				transaction.amount = editedTransaction.amount;
				transaction.date = editedTransaction.date;
				transaction.description = editedTransaction.description;
				
				transaction.creditor = $resource(editedTransaction.creditor).get();
				transaction.category = $resource(editedTransaction.category).get();
			}
			else {
				// if the transaction has been deleted, only the ID is returned
				for (i = 0; i < $scope.transactions.length; i++) {
					if ($scope.transactions[i].id == editedTransaction) {
						$scope.transactions.splice(i, 1);
					}
				}
			}
			
			refreshExpenses();
			
		}, function () {
			$log.info('DetailsModal dismissed ' + new Date());
		});
	};
	
	$scope.openOutstandings = function(user) {
		var modalInstance = $uibModal.open({
			templateUrl: 'outstandingsTemplate.html',
			controller: 'OutstandingsModalCtrl',
			resolve: {
				accountUser: user
			}
		});

		modalInstance.result.then(function() {
			$scope.refreshList();
		}, function () {
			$log.info('OutstandingsModal dismissed ' + new Date());
		});
	};
	
	// initialize (http://stackoverflow.com/a/25662066/3761783)
	$scope.initList();

} ]);

transactionControllers.controller('DetailsModalCtrl', [ '$scope', '$resource', '$uibModalInstance', 'Transaction', 'transactionId', 'categories', 'accountUsers', function($scope, $resource, $uibModalInstance, Transaction, transactionId, categories, accountUsers) {
	
	$scope.accountUsers = accountUsers;
	
	var transaction = Transaction.get({ id: transactionId });
	transaction.$promise.then(function(data) {
		transaction.amount = numberToAmount(transaction.amount);
		transaction.date = new Date(transaction.date);
		transaction.creditor = $resource(transaction._links.creditor.href).get();
		transaction.category = $resource(transaction._links.category.href).get();
		
		transaction.category.$promise.then(function(data) {
			$scope.transaction = transaction;
			$scope.categories = categories;
			
			for (i = 0; i < $scope.categories.length; i++) {
				if ($scope.categories[i].name == $scope.transaction.category.name) {
					$scope.transaction.category = $scope.categories[i];
					break;
				}
			}
			
			transaction.creditor.$promise.then(function(data) {
				$scope.transaction.creditor = $scope.transaction.creditor._links.user.href;
			},
			function(error) { // transactions without a creditor return a HTTP 404 error
				$scope.transaction.creditor = "";
			});
		});
		
	});
	
	$scope.ok = function () {
		$scope.transaction.category = $scope.transaction.category._links.self.href;
		$scope.transaction.amount = amountToNumber($scope.transaction.amount);
		$scope.transaction.$update(function(data) {}).then(
				$uibModalInstance.close($scope.transaction)
		);
	};

	$scope.cancel = function () {
		$uibModalInstance.dismiss('cancel');
	};
	
	$scope.deleteTransaction = function() {
		var deletedTransactionId = $scope.transaction.id;
		$resource($scope.transaction._links.self.href).remove().$promise.then(function() {
			$uibModalInstance.close(deletedTransactionId);
		});
	}
} ]);

transactionControllers.controller('OutstandingsModalCtrl', [ '$scope', '$uibModalInstance', '$http', '$resource', '$q', 'accountUser', function($scope, $uibModalInstance, $http, $resource, $q, accountUser) {
	
	$scope.accountUser = accountUser;
	
	$scope.ok = function () {
		$uibModalInstance.close();
	};

	$scope.close = function () {
		$uibModalInstance.dismiss('close');
	};
	
	$scope.clearOutstandings = function() {
		var promises = new Array($scope.accountUser.outstandings.length);
		for (i = 0; i < $scope.accountUser.outstandings.length; i++) {
			if ($scope.accountUser.outstandings[i].category === 'Private Entnahme') {
				// delete withdrawals
				var resource = $resource($scope.accountUser.outstandings[i].href).remove();
				promises[i] = resource.$promise;
			}
			else {
				// remove creditor from expenses
				promises[i] = $http.patch($scope.accountUser.outstandings[i].href, '{ "creditor" : "" }');
			}
		}
		
		$q.all(promises).then(function(data) {
			$uibModalInstance.close('cleared outstandings');
		});
	}
} ]);