public function get_main_chart() {
		global $wp_locale;

		if ( empty( $this->show_categories ) ) {
			?>
			<div class="chart-container">
				<p class="chart-prompt"><?php esc_html_e( 'Choose a category to view stats', 'woocommerce' ); ?></p>
			</div>
			<?php
		} else {
			$chart_data = array();
			$index      = 0;

			foreach ( $this->show_categories as $category ) {

				$category            = get_term( $category, 'product_cat' );
				$product_ids         = $this->get_products_in_category( $category->term_id );
				$category_chart_data = array();

				for ( $i = 0; $i <= $this->chart_interval; $i ++ ) {

					$interval_total = 0;

					switch ( $this->chart_groupby ) {
						case 'day':
							$time = strtotime( date( 'Ymd', strtotime( "+{$i} DAY", $this->start_date ) ) ) * 1000;
							break;
						case 'month':
						default:
							$time = strtotime( date( 'Ym', strtotime( "+{$i} MONTH", $this->start_date ) ) . '01' ) * 1000;
							break;
					}

					foreach ( $product_ids as $id ) {

						if ( isset( $this->item_sales_and_times[ $time ][ $id ] ) ) {
							$interval_total += $this->item_sales_and_times[ $time ][ $id ];
						}
					}

					$category_chart_data[] = array( $time, (float) wc_format_decimal( $interval_total, wc_get_price_decimals() ) );
				}

				$chart_data[ $category->term_id ]['category'] = $category->name;
				$chart_data[ $category->term_id ]['data']     = $category_chart_data;

				$index++;
			}
			?>
			<div class="chart-container">
				<div class="chart-placeholder main"></div>
			</div>
			<?php // @codingStandardsIgnoreStart ?>
			<script type="text/javascript">
				var main_chart;

				jQuery(function(){
					var drawGraph = function( highlight ) {
						var series = [
							<?php
								$index = 0;
								foreach ( $chart_data as $data ) {
									$color  = isset( $this->chart_colours[ $index ] ) ? $this->chart_colours[ $index ] : $this->chart_colours[0];
									$width  = $this->barwidth / sizeof( $chart_data );
									$offset = ( $width * $index );
									$series = $data['data'];

									foreach ( $series as $key => $series_data ) {
										$series[ $key ][0] = $series_data[0] + $offset;
									}

									$series = wp_json_encode( $series );

									echo '{
											label: "' . esc_js( $data['category'] ) . '",
											data: JSON.parse( decodeURIComponent( "' . rawurlencode( $series ) . '" ) ),
											color: "' . $color . '",
											bars: {
												fillColor: "' . $color . '",
												fill: true,
												show: true,
												lineWidth: 1,
												align: "center",
												barWidth: ' . $width * 0.75 . ',
												stack: false
											},
											' . $this->get_currency_tooltip() . ',
											enable_tooltip: true,
											prepend_label: true
										},';
									$index++;
								}
							?>
						];

						if ( highlight !== 'undefined' && series[ highlight ] ) {
							highlight_series = series[ highlight ];

							highlight_series.color = '#9c5d90';

							if ( highlight_series.bars ) {
								highlight_series.bars.fillColor = '#9c5d90';
							}

							if ( highlight_series.lines ) {
								highlight_series.lines.lineWidth = 5;
							}
						}

						main_chart = jQuery.plot(
							jQuery('.chart-placeholder.main'),
							series,
							{
								legend: {
									show: false
								},
								grid: {
									color: '#aaa',
									borderColor: 'transparent',
									borderWidth: 0,
									hoverable: true
								},
								xaxes: [ {
									color: '#aaa',
									reserveSpace: true,
									position: "bottom",
									tickColor: 'transparent',
									mode: "time",
									timeformat: "<?php echo ( 'day' === $this->chart_groupby ) ? '%d %b' : '%b'; ?>",
									monthNames: JSON.parse( decodeURIComponent( '<?php echo rawurlencode( wp_json_encode( array_values( $wp_locale->month_abbrev ) ) ); ?>' ) ),
									tickLength: 1,
									minTickSize: [1, "<?php echo $this->chart_groupby; ?>"],
									tickSize: [1, "<?php echo $this->chart_groupby; ?>"],
									font: {
										color: "#aaa"
									}
								} ],
								yaxes: [
									{
										min: 0,
										tickDecimals: 2,
										color: 'transparent',
										font: { color: "#aaa" }
									}
								],
							}
						);

						jQuery('.chart-placeholder').resize();

					}

					drawGraph();

					jQuery('.highlight_series').hover(
						function() {
							drawGraph( jQuery(this).data('series') );
						},
						function() {
							drawGraph();
						}
					);
				});
			</script>
			<?php // @codingStandardsIgnoreEnd ?>
			<?php
		}
	}