/*jshint multistr:true */

this.recline = this.recline || {};
this.recline.View = this.recline.View || {};

(function($, my) {
// ## SlickGrid Dataset View
//
// Provides a tabular view on a Dataset, based on SlickGrid.
//
// https://github.com/mleibman/SlickGrid
//
// Initialize it with a `recline.Model.Dataset`.
//
// Additional options to drive SlickGrid grid can be given through state.
// The following keys allow for customization:
// * gridOptions: to add options at grid level
// * columnsEditor: to add editor for editable columns
//
// For example:
//    var grid = new recline.View.SlickGrid({
//         model: dataset,
//         el: $el,
//         state: {
//          gridOptions: {editable: true},
//          columnsEditor: [
//            {column: 'date', editor: Slick.Editors.Date },
//            {column: 'title', editor: Slick.Editors.Text}
//          ]
//        }
//      });
//// NB: you need an explicit height on the element for slickgrid to work
my.SlickGrid = Backbone.View.extend({
  initialize: function(modelEtc) {
    var self = this;
    this.el = $(this.el);
    this.el.addClass('recline-slickgrid');
    _.bindAll(this, 'render');
    this.model.records.bind('add', this.render);
    this.model.records.bind('reset', this.render);
    this.model.records.bind('remove', this.render);
    this.model.records.bind('change', this.onRecordChanged, this);

    var state = _.extend({
        hiddenColumns: [],
        columnsOrder: [],
        columnsSort: {},
        columnsWidth: [],
        columnsEditor: [],
        options: {},
        fitColumns: false
      }, modelEtc.state

    );
    this.state = new recline.Model.ObjectState(state);
  },

  events: {
  },

  onRecordChanged: function(record) {
    // Ignore if the grid is not yet drawn
    if (!this.grid) {
      return;
    }

    // Let's find the row corresponding to the index
    var row_index = this.grid.getData().getModelRow( record );
    this.grid.invalidateRow(row_index);
    this.grid.getData().updateItem(record, row_index);
    this.grid.render();
  },

  render: function() {
    var self = this;

    var options = _.extend({
      enableCellNavigation: true,
      enableColumnReorder: true,
      explicitInitialization: true,
      syncColumnCellResize: true,
      forceFitColumns: this.state.get('fitColumns')
    }, self.state.get('gridOptions'));

    // We need all columns, even the hidden ones, to show on the column picker
    var columns = [];
    // custom formatter as default one escapes html
    // plus this way we distinguish between rendering/formatting and computed value (so e.g. sort still works ...)
    // row = row index, cell = cell index, value = value, columnDef = column definition, dataContext = full row values
    var formatter = function(row, cell, value, columnDef, dataContext) {
      var field = self.model.fields.get(columnDef.id);
      if (field.renderer) {
        return field.renderer(value, field, dataContext);
      } else {
        return value;
      }
    };
    _.each(this.model.fields.toJSON(),function(field){
      var column = {
        id: field.id,
        name: field.label,
        field: field.id,
        sortable: true,
        minWidth: 80,
        formatter: formatter
      };

      var widthInfo = _.find(self.state.get('columnsWidth'),function(c){return c.column === field.id;});
      if (widthInfo){
        column.width = widthInfo.width;
      }

      var editInfo = _.find(self.state.get('columnsEditor'),function(c){return c.column === field.id;});
      if (editInfo){
        column.editor = editInfo.editor;
      }
      columns.push(column);
    });

    // Restrict the visible columns
    var visibleColumns = columns.filter(function(column) {
      return _.indexOf(self.state.get('hiddenColumns'), column.id) === -1;
    });

    // Order them if there is ordering info on the state
    if (this.state.get('columnsOrder') && this.state.get('columnsOrder').length > 0) {
      visibleColumns = visibleColumns.sort(function(a,b){
        return _.indexOf(self.state.get('columnsOrder'),a.id) > _.indexOf(self.state.get('columnsOrder'),b.id) ? 1 : -1;
      });
      columns = columns.sort(function(a,b){
        return _.indexOf(self.state.get('columnsOrder'),a.id) > _.indexOf(self.state.get('columnsOrder'),b.id) ? 1 : -1;
      });
    }

    // Move hidden columns to the end, so they appear at the bottom of the
    // column picker
    var tempHiddenColumns = [];
    for (var i = columns.length -1; i >= 0; i--){
      if (_.indexOf(_.pluck(visibleColumns,'id'),columns[i].id) === -1){
        tempHiddenColumns.push(columns.splice(i,1)[0]);
      }
    }
    columns = columns.concat(tempHiddenColumns);

    // Transform a model object into a row
    function toRow(m) {
      var row = {};
      self.model.fields.each(function(field){
        row[field.id] = m.getFieldValueUnrendered(field);
      });
      return row;
    }

    function RowSet() {
      var models = [];
      var rows = [];

      this.push = function(model, row) {
        models.push(model);
        rows.push(row);
      };

      this.getLength = function() {return rows.length; };
      this.getItem = function(index) {return rows[index];};
      this.getItemMetadata = function(index) {return {};};
      this.getModel = function(index) {return models[index];};
      this.getModelRow = function(m) {return models.indexOf(m);};
      this.updateItem = function(m,i) {
        rows[i] = toRow(m);
        models[i] = m;
      };
    }

    var data = new RowSet();

    this.model.records.each(function(doc){
      data.push(doc, toRow(doc));
    });

    this.grid = new Slick.Grid(this.el, data, visibleColumns, options);

    // Column sorting
    var sortInfo = this.model.queryState.get('sort');
    if (sortInfo){
      var column = sortInfo[0].field;
      var sortAsc = sortInfo[0].order !== 'desc';
      this.grid.setSortColumn(column, sortAsc);
    }

    this.grid.onSort.subscribe(function(e, args){
      var order = (args.sortAsc) ? 'asc':'desc';
      var sort = [{
        field: args.sortCol.field,
        order: order
      }];
      self.model.query({sort: sort});
    });

    this.grid.onColumnsReordered.subscribe(function(e, args){
      self.state.set({columnsOrder: _.pluck(self.grid.getColumns(),'id')});
    });

    this.grid.onColumnsResized.subscribe(function(e, args){
        var columns = args.grid.getColumns();
        var defaultColumnWidth = args.grid.getOptions().defaultColumnWidth;
        var columnsWidth = [];
        _.each(columns,function(column){
          if (column.width != defaultColumnWidth){
            columnsWidth.push({column:column.id,width:column.width});
          }
        });
        self.state.set({columnsWidth:columnsWidth});
    });

    this.grid.onCellChange.subscribe(function (e, args) {
      // We need to change the model associated value
      //
      var grid = args.grid;
      var model = data.getModel(args.row);
      var field = grid.getColumns()[args.cell].id;
      var v = {};
      v[field] = args.item[field];
      model.set(v);
    });

    var columnpicker = new Slick.Controls.ColumnPicker(columns, this.grid,
                                                       _.extend(options,{state:this.state}));

    if (self.visible){
      self.grid.init();
      self.rendered = true;
    } else {
      // Defer rendering until the view is visible
      self.rendered = false;
    }

    return this;
 },

  show: function() {
    // If the div is hidden, SlickGrid will calculate wrongly some
    // sizes so we must render it explicitly when the view is visible
    if (!this.rendered){
      if (!this.grid){
        this.render();
      }
      this.grid.init();
      this.rendered = true;
    }
    this.visible = true;
  },

  hide: function() {
    this.visible = false;
  }
});

})(jQuery, recline.View);

/*
* Context menu for the column picker, adapted from
* http://mleibman.github.com/SlickGrid/examples/example-grouping
*
*/
(function ($) {
  function SlickColumnPicker(columns, grid, options) {
    var $menu;
    var columnCheckboxes;

    var defaults = {
      fadeSpeed:250
    };

    function init() {
      grid.onHeaderContextMenu.subscribe(handleHeaderContextMenu);
      options = $.extend({}, defaults, options);

      $menu = $('<ul class="dropdown-menu slick-contextmenu" style="display:none;position:absolute;z-index:20;" />').appendTo(document.body);

      $menu.bind('mouseleave', function (e) {
        $(this).fadeOut(options.fadeSpeed);
      });
      $menu.bind('click', updateColumn);

    }

    function handleHeaderContextMenu(e, args) {
      e.preventDefault();
      $menu.empty();
      columnCheckboxes = [];

      var $li, $input;
      for (var i = 0; i < columns.length; i++) {
        $li = $('<li />').appendTo($menu);
        $input = $('<input type="checkbox" />').data('column-id', columns[i].id).attr('id','slick-column-vis-'+columns[i].id);
        columnCheckboxes.push($input);

        if (grid.getColumnIndex(columns[i].id) !== null) {
          $input.attr('checked', 'checked');
        }
        $input.appendTo($li);
        $('<label />')
            .text(columns[i].name)
            .attr('for','slick-column-vis-'+columns[i].id)
            .appendTo($li);
      }
      $('<li/>').addClass('divider').appendTo($menu);
      $li = $('<li />').data('option', 'autoresize').appendTo($menu);
      $input = $('<input type="checkbox" />').data('option', 'autoresize').attr('id','slick-option-autoresize');
      $input.appendTo($li);
      $('<label />')
          .text('Force fit columns')
          .attr('for','slick-option-autoresize')
          .appendTo($li);
      if (grid.getOptions().forceFitColumns) {
        $input.attr('checked', 'checked');
      }

      $menu.css('top', e.pageY - 10)
          .css('left', e.pageX - 10)
          .fadeIn(options.fadeSpeed);
    }

    function updateColumn(e) {
      var checkbox;

      if ($(e.target).data('option') === 'autoresize') {
        var checked;
        if ($(e.target).is('li')){
            checkbox = $(e.target).find('input').first();
            checked = !checkbox.is(':checked');
            checkbox.attr('checked',checked);
        } else {
          checked = e.target.checked;
        }

        if (checked) {
          grid.setOptions({forceFitColumns:true});
          grid.autosizeColumns();
        } else {
          grid.setOptions({forceFitColumns:false});
        }
        options.state.set({fitColumns:checked});
        return;
      }

      if (($(e.target).is('li') && !$(e.target).hasClass('divider')) ||
            $(e.target).is('input')) {
        if ($(e.target).is('li')){
            checkbox = $(e.target).find('input').first();
            checkbox.attr('checked',!checkbox.is(':checked'));
        }
        var visibleColumns = [];
        var hiddenColumnsIds = [];
        $.each(columnCheckboxes, function (i, e) {
          if ($(this).is(':checked')) {
            visibleColumns.push(columns[i]);
          } else {
            hiddenColumnsIds.push(columns[i].id);
          }
        });

        if (!visibleColumns.length) {
          $(e.target).attr('checked', 'checked');
          return;
        }

        grid.setColumns(visibleColumns);
        options.state.set({hiddenColumns:hiddenColumnsIds});
      }
    }
    init();
  }

  // Slick.Controls.ColumnPicker
  $.extend(true, window, { Slick:{ Controls:{ ColumnPicker:SlickColumnPicker }}});
})(jQuery);
