app.controller( 'BalanceCtrl',
		[ '$scope', '$http', '$filter', 'ngTableParams',
		  function( $scope, $http, $filter, ngTableParams ) {
		      $scope.xFunction = function() {
			  return function( d ) {
			      return d.account;
			  };
		      };
		      $scope.yFunction = function() {
			  return function( d ) {
			      return d.amount;
			  };
		      };
		      $scope.toolTipContentFunction = function() {
			  return function( key, x, y, e, graph ) {
			      var details = $scope.balance.details[ key ];
			      return '<material-content><h3>' + details.key + '</h3>'
				  + '<table>'
				  + _(details.values).map( function( transaction ) {
				      return '<tr><td>'
					  + transaction.date + '</td><td>'
					  + transaction.payee + '</td><td style="text-align: right">'
					  + $filter( 'number' )( transaction.amount, 2 ) + ' '
					  + transaction.currency + '</td></tr>';
				  }).join( '' )
				  + '<tr><th></th><th>Total :</th><th>' + x + ' €</th></tr>'
				  + '</table></material-content>';
			  };
		      };

		      // compute an account's score: from 1 (good) to 10 (bad), 0 is neutral/undecided
		      $scope.score_account = function( account ) {
			  if ( account.match( /^Income:(salaire|Sécu|Mutuelle)$/ ) ) {
			      return 1;
			  } else if ( account.match( /^Income:(Gift|Remboursement)$/ ) ) {
			      return 6;
			  } else if ( account.match( /^Expenses:(courses|Hang)$/ ) ) {
			      return 1;
			  } else if ( account.match( /^Expenses:Home/ ) ) {
			      return 1;
			  } else if ( account.match( /^Expenses:Health/ ) ) {
			      return 1;
			  } else if ( account.match( /^Expenses:Car/ ) ) {
			      return 4;
			  } else if ( account.match( /^Expenses:(Food|Transport)/ ) ) {
			      return 6;
			  } else if ( account.match( /^Expenses:(Shopping|Entertainement)/ ) ) {
			      return 9;
			  } else if ( account.match( /^Expenses:Gadgets/ ) ) {
			      return 10;
			  } else {
			      return 0;
			  }
		      };

		      $scope.coloring_score = function( score ) {
			  var color_scale = [ '#99f', '#0f0', '#3f0', '#6f0', '#9f0', '#cf0', '#fc0', '#f90', '#f60', '#f30', '#f00' ];
			  return color_scale[ score ];
		      };

		      $scope.color = function() {
			  return function( d, i ) {
			      return $scope.coloring_score( $scope.score_account( d.data.account ) );
			  };
		      };

		      $scope.tableParams = new ngTableParams( { page: 1,   // show first page
								count: 999  // count per page
							      },
							      { counts: [], // hide page counts control
								total: 1//,  // value less than count hide pagination
								// getData: function($defer, params) {
								//     $defer.resolve(data.slice((params.page() - 1) * params.count(), params.page() * params.count()));
								// }
							      } );

		      var retrieve_data = function() {
			  $scope.from_date = new Date( $scope.dates_salaries[ $scope.period_offset ] );
			  $scope.to_date = ( $scope.period_offset < $scope.dates_salaries.length - 1 ) ? new Date( $scope.dates_salaries[ $scope.period_offset + 1 ] ) : null;
			  var from = moment( $scope.from_date );
			  var period = 'from ' + from.year() + '-' + ( from.month() + 1 ) + '-' + from.date();
			  if ( !_($scope.to_date).isNull() ) {
			      var to = moment( $scope.to_date );
			      period = period + ' to ' + to.year() + '-' + ( to.month() + 1 ) + '-' + to.date();
			  }

			  $scope.balance = { buckets: [ { name: 'Expenses',
							  data: [],
							  total: 0 },
							{ name: 'Income',
							  data: [],
							  total: 0 } ],
					     details: {} };

			  $http.get( '/api/ledger/balance',
				     { params: { period: period,
						 categories: 'Expenses' } } )
			      .then( function( response ) {
				  $scope.balance.buckets[ 0 ].data = _(response.data).sortBy( function( account ) {
				      return 1 / account.amount;
				  } );
				  _($scope.balance.buckets[ 0 ].data).each(
				      function( account ) {
					  $http.get( '/api/ledger/register',
						     { params: { period: period,
								 category: account.account } } )
					      .then( function( response ) {
						  $scope.balance.details[ account.account ] = response.data;
					      } );
				      } );
				  $scope.balance.buckets[ 0 ].total = _(response.data).reduce( function( memo, account ){ return memo + account.amount; }, 0 );
			      } );
			  $http.get( '/api/ledger/balance',
				     { params: { period: period,
						 categories: 'Income' } } )

			      .then( function( response ) {
				  $scope.balance.buckets[ 1 ].data = _(response.data)
				      .map( function( account ) {
					  account.amount = account.amount * -1;
					  return account;
				      } );
				  $scope.balance.buckets[ 1 ].data = _($scope.balance.buckets[ 1 ].data)
				      .sortBy( function( account ) {
					  return account.amount;
				      } );
				  _($scope.balance.buckets[ 1 ].data)
				      .each( function( account ) {
					  $http.get( '/api/ledger/register',
						     { params: { period: period,
								 category: account.account } } )
					      .then( function( response ) {
						  $scope.balance.details[ account.account ] = response.data;
					      } );
				      } );
				  $scope.balance.buckets[ 1 ].total = _(response.data)
				      .reduce( function( memo, account ){ return memo + account.amount; }, 0 );
			      } );
		      };

		      $scope.dates_salaries = [];
		      $scope.period_offset = 0;
		      $scope.after = function() { if ( $scope.period_offset < $scope.dates_salaries.length - 1 ) { $scope.period_offset++; } };
		      $scope.before = function() { if ( $scope.period_offset > 0 ) { $scope.period_offset--; } };
		      $scope.reset_offset = function() { $scope.period_offset = $scope.dates_salaries.length - 1; };

		      $http.get( '/api/ledger/dates_salaries' )
			  .then( function( response ) {
			      $scope.dates_salaries = response.data;

			      $scope.reset_offset();

			      // retrieve_data() when the value of week_offset changes
			      // n.b.: triggered when week_offset is initialized above
			      $scope.$watch( 'period_offset', function() { retrieve_data(); } );

			  } );
		  } ] );