var _ = require('underscore');

var BLACKLISTED_COLUMNS = ['created_at', 'the_geom', 'the_geom_webmercator', 'updated_at'];

/**
 * Tmp data structure with column and layer-def models for each unique name+type tuple.
 * Each bucket contains a columnModel and layerDefinitionModel tuple,
 * since they are unique even if the columns' name+type happen to be the same
 * From this widget definition options for specific needs
 *
 * @param {Object} layerDefinitionsCollection
 * @return {Object} e.g.
 *   e.g.
 *     {
 *       foobar-string: [{
 *         columnModel: M({name: 'foobar', type: 'string', …}),
 *         layerDefinitionModel: M({ id: 'abc-123', … })
 *       }]
 *     }
 */
module.exports = function (analysisDefinitionNodesCollection, layerDefinitionsCollection) {
  return analysisDefinitionNodesCollection
    .reduce(function (tuplesItems, nodeDefModel) {
      var layerDefinitionModel = layerDefinitionsCollection.find(function (l) { return l.isOwnerOfAnalysisNode(nodeDefModel); });
      if (!layerDefinitionModel) return tuplesItems; // e.g. if the node is one of those temporary tables

      var querySchemaModel = nodeDefModel.querySchemaModel;
      var queryGeometryModel = nodeDefModel.queryGeometryModel;
      if (!querySchemaModel || !queryGeometryModel) return tuplesItems;
      if (!queryGeometryModel.isDone() || !queryGeometryModel.get('simple_geom')) {
        return tuplesItems;
      }

      querySchemaModel.columnsCollection.each(function (m) {
        var columnName = m.get('name');

        if (!_.contains(BLACKLISTED_COLUMNS, columnName)) {
          var key = columnName + '-' + m.get('type');
          var tuples = tuplesItems[key] = tuplesItems[key] || [];
          tuples.push({
            analysisDefinitionNodeModel: nodeDefModel,
            layerDefinitionModel: layerDefinitionModel,
            columnModel: m
          });
        }
      });

      return tuplesItems;
    }, {});
};