public function get_chart_legend() {
		$legend = array();
		$data   = $this->get_report_data();

		switch ( $this->chart_groupby ) {
			case 'day':
				$average_total_sales_title = sprintf(
					/* translators: %s: average total sales */
					__( '%s average gross daily sales', 'woocommerce' ),
					'<strong>' . wc_price( $data->average_total_sales ) . '</strong>'
				);
				$average_sales_title = sprintf(
					/* translators: %s: average sales */
					__( '%s average net daily sales', 'woocommerce' ),
					'<strong>' . wc_price( $data->average_sales ) . '</strong>'
				);
				break;
			case 'month':
			default:
				$average_total_sales_title = sprintf(
					/* translators: %s: average total sales */
					__( '%s average gross monthly sales', 'woocommerce' ),
					'<strong>' . wc_price( $data->average_total_sales ) . '</strong>'
				);
				$average_sales_title = sprintf(
					/* translators: %s: average sales */
					__( '%s average net monthly sales', 'woocommerce' ),
					'<strong>' . wc_price( $data->average_sales ) . '</strong>'
				);
				break;
		}

		$legend[] = array(
			'title'            => sprintf(
				/* translators: %s: total sales */
				__( '%s gross sales in this period', 'woocommerce' ),
				'<strong>' . wc_price( $data->total_sales ) . '</strong>'
			),
			'placeholder'      => __( 'This is the sum of the order totals after any refunds and including shipping and taxes.', 'woocommerce' ),
			'color'            => $this->chart_colours['sales_amount'],
			'highlight_series' => 6,
		);
		if ( $data->average_total_sales > 0 ) {
			$legend[] = array(
				'title'            => $average_total_sales_title,
				'color'            => $this->chart_colours['average'],
				'highlight_series' => 2,
			);
		}

		$legend[] = array(
			'title'            => sprintf(
				/* translators: %s: net sales */
				__( '%s net sales in this period', 'woocommerce' ),
				'<strong>' . wc_price( $data->net_sales ) . '</strong>'
			),
			'placeholder'      => __( 'This is the sum of the order totals after any refunds and excluding shipping and taxes.', 'woocommerce' ),
			'color'            => $this->chart_colours['net_sales_amount'],
			'highlight_series' => 7,
		);
		if ( $data->average_sales > 0 ) {
			$legend[] = array(
				'title'            => $average_sales_title,
				'color'            => $this->chart_colours['net_average'],
				'highlight_series' => 3,
			);
		}

		$legend[] = array(
			'title'            => sprintf(
				/* translators: %s: total orders */
				__( '%s orders placed', 'woocommerce' ),
				'<strong>' . $data->total_orders . '</strong>'
			),
			'color'            => $this->chart_colours['order_count'],
			'highlight_series' => 1,
		);

		$legend[] = array(
			'title'            => sprintf(
				/* translators: %s: total items */
				__( '%s items purchased', 'woocommerce' ),
				'<strong>' . $data->total_items . '</strong>'
			),
			'color'            => $this->chart_colours['item_count'],
			'highlight_series' => 0,
		);
		$legend[] = array(
			'title'            => sprintf(
				/* translators: 1: total refunds 2: total refunded orders 3: refunded items */
				_n( '%1$s refunded %2$d order (%3$d item)', '%1$s refunded %2$d orders (%3$d items)', $this->report_data->total_refunded_orders, 'woocommerce' ),
				'<strong>' . wc_price( $data->total_refunds ) . '</strong>',
				$this->report_data->total_refunded_orders,
				$this->report_data->refunded_order_items
			),
			'color'            => $this->chart_colours['refund_amount'],
			'highlight_series' => 8,
		);
		$legend[] = array(
			'title'            => sprintf(
				/* translators: %s: total shipping */
				__( '%s charged for shipping', 'woocommerce' ),
				'<strong>' . wc_price( $data->total_shipping ) . '</strong>'
			),
			'color'            => $this->chart_colours['shipping_amount'],
			'highlight_series' => 5,
		);
		$legend[] = array(
			'title'            => sprintf(
				/* translators: %s: total coupons */
				__( '%s worth of coupons used', 'woocommerce' ),
				'<strong>' . wc_price( $data->total_coupons ) . '</strong>'
			),
			'color'            => $this->chart_colours['coupon_amount'],
			'highlight_series' => 4,
		);

		return $legend;
	}