<!DOCTYPE html>
<!--
Copyright (c) 2015 The Chromium Authors. All rights reserved.
Use of this source code is governed by a BSD-style license that can be
found in the LICENSE file.
-->
<link rel="import" href="/base/iteration_helpers.html">
<link rel="import" href="/base/statistics.html">
<link rel="import" href="/base/ui/table.html">
<link rel="import" href="/base/units/generic_table.html">
<link rel="import" href="/base/units/array_of_numbers_span.html">
<polymer-element name="tr-b-u-generic-table-view">
  <template>
    <style>
    :host {
    display: flex;
    }
    #table {
      flex: 1 1 auto;
      align-self: stretch;
    }
    </style>
    <tr-b-ui-table id="table"></tr-b-ui-table>
  </template>
</polymer-element>
<script>
'use strict';

tr.exportTo('tr.b.units', function() {
  var TEXT_COLUMN_MODE = 1;
  var NUMERIC_COLUMN_MODE = 2;

  function isNumeric(value) {
    // TODO(nduca): Also consider other units that are numeric.
    if ((typeof value) === 'number')
      return true;
    else if (value instanceof Number)
      return true;
    return false;
  }

  function GenericTableViewTotalsItem(opt_values) {
    if (opt_values !== undefined)
      this.values = opt_values;
    else
      this.values = [];
  }

  function GenericTableViewColumnDescriptor(fieldName, firstFieldValue) {
    this.title = fieldName;
    this.fieldName = fieldName;

    this.updateModeGivenValue(firstFieldValue);
  }

  GenericTableViewColumnDescriptor.prototype = {
    get columnMode() {
      return this.columnMode_;
    },

    get isInNumericMode() {
      return this.columnMode_ === NUMERIC_COLUMN_MODE;
    },

    cmp: function(a, b) {
      return tr.b.comparePossiblyUndefinedValues(a, b, function(a, b) {
        var vA = a[this.fieldName];
        var vB = b[this.fieldName];
        return tr.b.comparePossiblyUndefinedValues(vA, vB, function(vA, vB) {
          if (vA.localeCompare)
            return vA.localeCompare(vB);
          return vA - vB;
        }, this);
      }, this);
    },

    updateModeGivenValue: function(fieldValue) {
      if (this.columnMode_ === undefined) {
        if (fieldValue === undefined || fieldValue === null)
          return;

        if (isNumeric(fieldValue))
          this.columnMode_ = NUMERIC_COLUMN_MODE;
        else
          this.columnMode_ = TEXT_COLUMN_MODE;
        return;
      }

      // Undefineds & nulls shouldn't change the mode.
      if (fieldValue === undefined || fieldValue === null)
        return;

      // If we were already in numeric mode, then we don't
      // need to put it into numeric mode again. And, if we were
      // previously in text mode, then we can't go into numeric mode now.
      if (isNumeric(fieldValue))
        return;

      this.columnMode_ = TEXT_COLUMN_MODE;
    },

    value: function(item) {
      var fieldValue = item[this.fieldName];
      if (fieldValue instanceof GenericTableViewTotalsItem) {
        var span = document.createElement('tr-b-u-array-of-numbers-span');
        span.summaryMode = tr.b.units.ArrayOfNumbersSummaryModes.TOTAL_MODE;
        span.numbers = fieldValue.values;
        return span;
      }

      if (fieldValue === undefined)
        return '-';

      // TODO(nduca): Use units objects if applicable.
      return fieldValue;
    }
  };

  Polymer('tr-b-u-generic-table-view', {
    created: function() {
      this.items_ = undefined;
    },

    get items() {
      return this.items_;
    },

    set items(itemsOrGenericTable) {
      if (itemsOrGenericTable === undefined) {
        this.items_ = undefined;
      } else if (itemsOrGenericTable instanceof Array) {
        this.items_ = itemsOrGenericTable;
      } else if (itemsOrGenericTable instanceof tr.b.units.GenericTable) {
        this.items_ = itemsOrGenericTable.items;
      }
      this.updateContents_();
    },

    createColumns_: function() {
      var columnsByName = {};
      this.items_.forEach(function(item) {
        tr.b.iterItems(item, function(itemFieldName, itemFieldValue) {
          var colDesc = columnsByName[itemFieldName];
          if (colDesc !== undefined) {
            colDesc.updateModeGivenValue(itemFieldValue);
            return;
          }

          colDesc = new GenericTableViewColumnDescriptor(
              itemFieldName, itemFieldValue);
          columnsByName[itemFieldName] = colDesc;
        }, this);
      }, this);

      var columns = tr.b.dictionaryValues(columnsByName);
      if (columns.length === 0)
        return undefined;

      // Sort by name.
      columns.sort(function(a, b) {
        return a.title.localeCompare(b.title);
      });

      // Set sizes. This is convoluted by the fact that the first
      // table column must have fixed size.
      var colWidthPercentage;
      if (columns.length == 1)
        colWidthPercentage = '100%';
      else
        colWidthPercentage = (100 / (columns.length - 1)).toFixed(3) + '%';
      columns[0].width = '250px';
      for (var i = 1; i < columns.length; i++)
        columns[i].width = colWidthPercentage;

      return columns;
    },

    createFooterRowsIfNeeded_: function(columns) {
      // Make totals row if needed.
      var hasColumnThatIsNumeric = columns.some(function(column) {
        return column.isInNumericMode;
      });
      if (!hasColumnThatIsNumeric)
        return [];

      var totalsItems = {};
      columns.forEach(function(column) {
        if (!column.isInNumericMode)
          return;
        var totalsItem = new GenericTableViewTotalsItem();
        this.items_.forEach(function(item) {
          var fieldValue = item[column.fieldName];
          if (fieldValue === undefined || fieldValue === null)
            return;
          totalsItem.values.push(fieldValue);
        });
        totalsItems[column.fieldName] = totalsItem;
      }, this);

      return [totalsItems];
    },

    updateContents_: function() {
      var columns;
      if (this.items_ !== undefined)
        columns = this.createColumns_();

      if (!columns) {
        this.$.table.tableColumns = [];
        this.$.table.tableRows = [];
        this.$.table.footerRows = [];
        return;
      }

      this.$.table.tableColumns = columns;
      this.$.table.tableRows = this.items_;
      this.$.table.footerRows = this.createFooterRowsIfNeeded_(columns);
      this.$.table.rebuild();
    }
  });

  return {
    GenericTableViewTotalsItem: GenericTableViewTotalsItem,
    GenericTableViewColumnDescriptor: GenericTableViewColumnDescriptor
  };
});
</script>