Product::purchase_button()

	public function purchase_button() {
		$options  = $this->has_options() || $this->out_of_stock() ? 'disabled="disabled"' : '';
		$preorder = $this->availability() === Availability::PREORDER;
		$cart     = get_option( Cart::OPTION_ENABLE_CART, true );
		$class    = 'bc-btn bc-btn--form-submit';

		/**
		 * Filters purchase button attributes.
		 *
		 * @param array   $attributes Attributes.
		 * @param Product $product    Product.
		 */
		$attributes = apply_filters( 'bigcommerce/button/purchase/attributes', [], $this );
		$attributes = implode( ' ', array_map( function ( $attribute, $value ) {
			$attribute  = sanitize_title_with_dashes( $attribute );
			$value      = esc_attr( $value );

			return sprintf( '%s="%s"', $attribute, $value );
		}, array_keys( $attributes ), $attributes ) );

		if ( $preorder ) {
			$class .= ' bc-btn--preorder';
		}
		if ( $cart ) {
			$class .= ' bc-btn--add_to_cart';
			$label = $preorder ? get_option( Buttons::PREORDER_TO_CART, __( 'Add to Cart', 'bigcommerce' ) ) : get_option( Buttons::ADD_TO_CART, __( 'Add to Cart', 'bigcommerce' ) );
		} else {
			$class .= ' bc-btn--buy';
			$label = $preorder ? get_option( Buttons::PREORDER_NOW, __( 'Pre-Order Now', 'bigcommerce' ) ) : get_option( Buttons::BUY_NOW, __( 'Buy Now', 'bigcommerce' ) );
		}
		$button = sprintf( '<button class="%s" type="submit" data-js="%d" %s %s>%s</button>', $class, $this->bc_id(), $options, $attributes, $label );

		/**
		 * Filters purchase button.
		 *
		 * @param string $button  Button html.
		 * @param int    $post_id Post id.
		 * @param string $label   Label.
		 */
		return apply_filters( 'bigcommerce/button/purchase', $button, $this->post_id, $label );
	}