morpheus.CollapseDatasetTool = function () {
};
morpheus.CollapseDatasetTool.Functions = [morpheus.Mean, morpheus.Median,
	new morpheus.MaxPercentiles([25, 75]), morpheus.Min, morpheus.Max, morpheus.Sum];
morpheus.CollapseDatasetTool.Functions.fromString = function (s) {
	for (var i = 0; i < morpheus.CollapseDatasetTool.Functions.length; i++) {
		if (morpheus.CollapseDatasetTool.Functions[i].toString() === s) {
			return morpheus.CollapseDatasetTool.Functions[i];
		}
	}
	throw new Error(s + ' not found');
};
morpheus.CollapseDatasetTool.prototype = {
	toString: function () {
		return 'Collapse';
	},
	init: function (project, form) {
		var setValue = function (val) {
			var isRows = val === 'Rows';
			var names = morpheus.MetadataUtil.getMetadataNames(isRows ? project
			.getFullDataset().getRowMetadata() : project
			.getFullDataset().getColumnMetadata());
			form.setOptions('collapse_to_fields', names);
		};
		form.$form.find('[name=collapse]').on('change', function (e) {
			setValue($(this).val());
		});
		setValue('Rows');
	},
	gui: function () {
		return [{
			name: 'collapse_method',
			options: morpheus.CollapseDatasetTool.Functions,
			value: morpheus.CollapseDatasetTool.Functions[1].toString(),
			type: 'select'
		}, {
			name: 'collapse',
			options: ['Columns', 'Rows'],
			value: 'Rows',
			type: 'radio'
		}, {
			name: 'collapse_to_fields',
			options: [],
			type: 'select',
			multiple: true
		}];
	},
	execute: function (options) {
		var project = options.project;
		var controller = options.controller;
		var f = morpheus.CollapseDatasetTool.Functions
		.fromString(options.input.collapse_method);
		var collapseToFields = options.input.collapse_to_fields;
		if (collapseToFields.length === 0) {
			throw new Error('Please select one or more fields to collapse to');
		}
		var dataset = project.getFullDataset();
		var rows = options.input.collapse == 'Rows';
		if (!rows) {
			dataset = new morpheus.TransposedDatasetView(dataset);
		}
		var allFields = morpheus.MetadataUtil.getMetadataNames(dataset
		.getRowMetadata());
		dataset = morpheus.CollapseDataset(dataset, collapseToFields, f, true);
		if (!rows) {
			dataset = new morpheus.TransposedDatasetView(dataset);
		}
		var set = new morpheus.Map();
		_.each(allFields, function (field) {
			set.set(field, true);
		});
		_.each(collapseToFields, function (field) {
			set.remove(field);
		});
		// hide fields that were not part of collapse to
		set.forEach(function (val, name) {
			controller.setTrackVisible(name, false, !rows);
		});
		project.setFullDataset(dataset, true);
	}
};