function entry(data){
    var id = ko.utils.unwrapObservable(data.id);
    var value_date = ko.utils.unwrapObservable(data.value_date);
    var operation_date = ko.utils.unwrapObservable(data.operation_date);
    var label = ko.utils.unwrapObservable(data.label);
    var value = ko.utils.unwrapObservable(data.value);
    var account = ko.utils.unwrapObservable(data.account);
    var sold = ko.utils.unwrapObservable(data.sold);
    var pointedSold = ko.utils.unwrapObservable(data.pointedSold);

    this.id=ko.observable(id ? id : null);
    this.value_date=ko.observable(value_date ? value_date : null);
    this.operation_date=ko.observable(operation_date ? operation_date : null);
    this.label=ko.observable(label ? label : null);
    this.value=ko.observable(value ? value : null);
    this.account=ko.observable(account ? account : null);
    this.sold=ko.observable(sold ? sold : null);
    this.pointedSold=ko.observable(pointedSold ? pointedSold : null);
}

function message(alertType, title, message) {
  $(".alert").alert('close');
  $("#message-placeholder").append('<div class="alert alert-' + alertType + '"><button type="button" class="close" data-dismiss="alert">&times;</button><h4>' + title + '</h4><strong>' + message + '</strong></div>');
}

var ListViewModel = function() {
    var self = this;
    window.viewModel = self;

    self.account = ko.observable();
    self.accounts = ko.observableArray([]);

    self.entries = ko.observableArray([]);

    self.years = ko.observableArray();
    self.year = ko.observable();
    self.months = ko.observableArray();
    self.month = ko.observable();

    self.pointedSold = ko.observable();
    self.futureSold = ko.observable();
    self.currentSold = ko.observable();

    self.selectedItem = ko.observable();
    self.savedItem = ko.observable();

    self.loadEntries = function() {
      $.post("api/entry.php", {action: "get_entries", account: self.account().id, year: self.year(), month:self.month()}, function(data) {
          self.entries.removeAll();
          self.selectedItem(null);

          $.each(data['entries'], function(index, element) {
              self.entries.push(new entry({
                id: element.id,
                value_date: new Date(element.value_date),
                operation_date: element.operation_date ? new Date(element.operation_date) : null,
                label: element.label,
                value: element.value,
                account: element.account_id,
                sold: element.sold,
                pointedSold: element.operation_date ? element.pointedsold : ''
              }));
          });

          self.currentSold(data['currentSold']);
          self.pointedSold(data['pointedSold']);
          self.futureSold(data['futureSold']);
      });
    };

    self.templateToUse = function (item) {
      return self.selectedItem() === item ? 'editTmpl' : 'itemsTmpl';
    };

    self.edit = function(item) {
      if(self.savedItem() != null) {
        self.cancel();
      }

      self.savedItem(new entry(item));
      self.selectedItem(item);

      $("#value_date").datepicker({format: "yyyy-mm-dd"}).on('changeDate', function(ev){
        self.selectedItem().value_date(new Date(ev.date.valueOf()));
      });

      $("#operation_date").datepicker({format: "yyyy-mm-dd"}).on('changeDate', function(ev){
        self.selectedItem().operation_date(new Date(ev.date.valueOf()));
      });

      $("#operation_date_clear").click(function(e){
        self.selectedItem().operation_date(null);
      });
    };

    self.cancel = function() {
      if(self.selectedItem() && self.savedItem()) {
        self.selectedItem().id(self.savedItem().id());
        self.selectedItem().operation_date(self.savedItem().operation_date());
        self.selectedItem().value_date(self.savedItem().value_date());
        self.selectedItem().label(self.savedItem().label());
        self.selectedItem().value(self.savedItem().value());
        self.selectedItem().account(self.savedItem().account());
      }

      // This item was just added.
      if(self.selectedItem() && !self.selectedItem().id()) {
        self.entries.remove(self.selectedItem());
      }

      self.savedItem(null);
      self.selectedItem(null);
    };

    self.add = function() {
      newEntry = new entry({
        account: self.account().id
      });
      this.entries.unshift(newEntry);
      self.selectedItem(newEntry);

      $("#value_date").datepicker({format: "yyyy-mm-dd"}).on('changeDate', function(ev){
        self.selectedItem().value_date(new Date(ev.date.valueOf()));
      });

      $("#operation_date").datepicker({format: "yyyy-mm-dd"}).on('changeDate', function(ev){
        self.selectedItem().operation_date(new Date(ev.date.valueOf()));
      });

      $("#operation_date_clear").click(function(e){
        self.selectedItem().operation_date(null);
      });
    };

    self.save = function() {
      var item = new entry(self.selectedItem());

      if(item.value_date()) {
          item.value_date(dateToString(item.value_date()));
      }
      if(item.operation_date()) {
          item.operation_date(dateToString(item.operation_date()));
      }

      $.post("api/entry.php", {action: "save_entry", entry:item}).success(function(data) {
        message("success", "Save", data.message);

        self.selectedItem(null);
        self.loadEntries();
      }).error(function() {
        message("error", "Error.", "Unexpected error.");
      });
    };

    self.remove = function (item) {
      if (item.id()) {
        if (confirm('Are you sure you wish to delete this item?')) {
          $.post("api/entry.php", {action: "remove_entry", entry:item}).success(function (result) {
            self.selectedItem(null);
            self.loadEntries();
          });
        }
      } else {
        self.entries.remove(item);
      }
    };

    self.loadAccounts = function() {
      $.post("api/entry.php", {action: "get_accounts"}).success(function (result) {
        self.accounts(result);

        if(! self.account()) {
          self.account(result[0]);
        }
      });
    };

    self.loadYears = function(account) {
      $.post("api/entry.php", {action: "get_years", account: account.id}).success(function (result) {
        self.years(result);

        if(! self.year()){
          self.year(result[0]);
        }
      });
    };

    self.loadMonths = function(year){
      $.post("api/entry.php", {action: "get_months", year: year}).success(function (result) {
        self.months(result);

        if(! self.month()) {
          self.month(result[0]);
        }
      });
    };

    self.account.subscribe(self.loadYears);

    self.year.subscribe(self.loadMonths);

    self.month.subscribe(self.loadEntries);

    self.loadAccounts();
};

function dateToString(date) {
    if(date) {
      var year = date.getFullYear();
      var month = date.getMonth() + 1;
      var day = date.getDate();

      dateStr = year + "-" + (month < 10 ? '0' : '') + month + "-" + (day < 10 ? '0' : '') + day;

      return dateStr;;
    } else {
      return '';
    }
};


ko.bindingHandlers.date = {
    init: function (element, valueAccessor, allBindingsAccessor, viewModel) {
      var unwrap = ko.utils.unwrapObservable;
      var dataSource = valueAccessor();

      value = dataSource ? unwrap(dataSource) : null;

      if(value) {
        $(element).text(dateToString(value));
      } else {
        $(element).text('');
      }
    },

    update: function (element, valueAccessor, allBindingsAccessor, viewModel) {
      var unwrap = ko.utils.unwrapObservable;
      var dataSource = valueAccessor();

      value = dataSource ? unwrap(dataSource) : null;

      if(value) {
        $(element).text(dateToString(value));
      } else {
        $(element).text('');
      }
    }
};

ko.bindingHandlers.dateValue = {
    init: function (element, valueAccessor, allBindingsAccessor, viewModel) {
      var unwrap = ko.utils.unwrapObservable;
      var dataSource = valueAccessor();

      value = dataSource ? unwrap(dataSource) : null;

      if(value) {
        $(element).val(dateToString(value));
      } else {
        $(element).val('');
      }
    },

    update: function (element, valueAccessor, allBindingsAccessor, viewModel) {
      var unwrap = ko.utils.unwrapObservable;
      var dataSource = valueAccessor();

      value = dataSource ? unwrap(dataSource) : null;

      if(value) {
        $(element).val(dateToString(value));
      } else {
        $(element).val('');
      }
    }
};


ko.applyBindings(new ListViewModel());