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

function amountToNumber(amount) {
	console.log("typeof amount: " + (typeof amount));
	amount = amount.toString().replace(',', '.');
	if (amount.charAt(0) !== '+' && amount.charAt(0) !== '-') {
		amount = '-' + amount;
	}
	return amount;
}

transactionControllers.controller('TransactionListCtrl', [ '$scope', '$location', '$resource', '$q', '$uibModal', '$log', 'Transaction', function($scope, $location, $resource, $q, $uibModal, $log, Transaction) {
	
	$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
		$log.info('get transactions:');
		var transactions = $resource('http://localhost:8080/transactions/search/forAccount', { accountId: $scope.account.id, size: $scope.pageSize, sort: 'date,desc' }).get();
		transactions.$promise.then(function(data) {
			$log.info(transactions._embedded.transactions);
			$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;
		});
		
		var accountUsers = $resource($scope.account._links.users.href).get();
		accountUsers.$promise.then(function(data) {
			$scope.accountUsers = accountUsers._embedded.users;
			
			// initialize attributes for outstanding amounts
			for (i = 0; i < $scope.accountUsers.length; i++) {
				$scope.accountUsers[i].outstandings = 0.0;
			}
			
			// get expenses 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/expenses', { 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++) {
					var expenseSum = 0;
					for (j = 0; j < data[i]._embedded.transactions.length; j++) {
						expenseSum = expenseSum + data[i]._embedded.transactions[j].amount;
					}
					$scope.accountUsers[i].outstandings -= expenseSum;
					//console.log('Expenses by ' + $scope.accountUsers[i].name + ': ' + expenseSum);
				}
			});
			
			// get 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('/withdrawals/search/forAccount', { 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++) {
					var withdrawnSum = 0;
					for (j = 0; j < data[i]._embedded.withdrawals.length; j++) {
						withdrawnSum = withdrawnSum + data[i]._embedded.withdrawals[j].amount;
					}
					$scope.accountUsers[i].outstandings -= withdrawnSum;
					//console.log('Withdrawals by ' + $scope.accountUsers[i].name + ': ' + withdrawnSum);
				}
			});
		});
	}
	
	$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 ($scope.transaction.category.id == -1) {
			for (i = 0; i < userLabels.length; i++) {
				console.log(userLabels[i].innerHTML.substr(-$scope.userinfo.name.length-6));
				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;
				$scope.account = $scope.accounts[0];
				
				var categories = $resource('/categories/search/listForAccount', { accountId: $scope.accounts[0].id }).get();
				categories.$promise.then(function(data) {
					$scope.categories = categories._embedded.categories;
					
					//$scope.categories.push({id: -1, name: '────────────────', position: 9999, disabled: true});
					$scope.categories.push({id: -1, name: 'private Entnahme', position: 10000, _links: { self: {href: 'withdrawal'}}});
					
					$scope.refreshList();
				});
			});
		});
		
	}
	
	$scope.postTransaction = function() {
		
		var amount = amountToNumber($scope.transaction.amount);
		
		// handle withdrawals
		if ($scope.transaction.category._links.self.href === 'withdrawal') {
			if (amount.charAt(0) === '-') {
				amount = amount.substr(1);
			}
			
			var Withdrawal = $resource('/withdrawals');
			
			var newWithdrawal = new Withdrawal({
				"account" : $scope.account._links.self.href,
				"amount" : amount,
				"date" : $scope.transaction.date,
				"user" : $scope.userinfo._links.self.href
			});
			
			newWithdrawal.$save(function(withdrawal) {
				$scope.refreshList();
				$scope.lastSubmission = newWithdrawal;
			});
			
			return;
		}
			
		var newTransaction = new Transaction({
			"account" : $scope.account._links.self.href,
			"amount" : amount,
			"date" : $scope.transaction.date,
			"description" : $scope.transaction.description,
			"category" : $scope.transaction.category._links.self.href,
			"creditor" : $scope.transaction.creditor
		});
		
		newTransaction.$save(function(transaction) {
			$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('http://localhost:8080/transactions/search/forAccount', { accountId: $scope.account.id, size: $scope.pageSize, sort: 'date,desc', page: $scope.pageNumber }).get();
			transactions.$promise.then(function(data) {
				$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('http://localhost:8080/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(transactionId) {
		var modalInstance = $uibModal.open({
			templateUrl: 'detailsTemplate.html',
			controller: 'DetailsModalCtrl',
			resolve: {
				transactionId: transactionId,
				categories: function () {
			          return $scope.categories;
			        },
				accountUsers: function () {
			          return $scope.accountUsers;
		        }
			}
		});

		modalInstance.result.then(function(transaction) {
			$scope.lastSubmission = undefined;
			$scope.refreshList();
		}, function () {
			$log.info('Modal dismissed at: ' + 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.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 () {
		// set URI for category and save via PUT request
		$scope.transaction.category = $scope.transaction.category._links.self.href;
		$scope.transaction.amount = amountToNumber($scope.transaction.amount);
		$scope.transaction.$update(function() {});
		
		$uibModalInstance.close($scope.transaction);
	};

	$scope.cancel = function () {
		$uibModalInstance.dismiss('cancel');
	};
	
	$scope.deleteTransaction = function() {
		// TODO auf return code reagieren
		$resource($scope.transaction._links.self.href).remove().$promise.then(function() {
			$uibModalInstance.close();
		});
	}
} ]);