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//** Wholesale pricing based on 'wholesaler' role
// checks if the current user is capable to have the wholesale pricing
function gum_woo_wholesale_pricing_applies(){
    return (bool) ( current_user_can('wholesaler') && ( !is_admin() || is_ajax() ) );
}

// wholesale price when available for both Simple & Variable product type
function gum_woo_wholesale_price_get( $product ) {
    if( $product->is_type( array('simple', 'variable') ) && get_post_meta( $product->id, '_wholesale_price', true ) > 0 ){
        return get_post_meta( $product->id, '_wholesale_price', true );
    } elseif( $product->is_type('variation') && get_post_meta( $product->variation_id, '_wholesale_price', true ) > 0 ){
        return get_post_meta( $product->variation_id, '_wholesale_price', true );
    }
    
    return 0;
}

//* Add Wholesale Pricing input to the Simple product editing page
add_action( 'woocommerce_product_options_pricing', 'gum_woo_wholesale_pricing_field' );
function gum_woo_wholesale_pricing_field() {
    woocommerce_wp_text_input( array( 
        'id' => '_wholesale_price',
        'class' => 'wc_input_wholesale_price short',
        'label' => __( 'Wholesale Price', 'woocommerce' ) . ' ('.get_woocommerce_currency_symbol().')',
        'type' => 'text'
    ));
}

//save the wholesale price value
add_action( 'woocommerce_process_product_meta_simple', 'gum_woo_wholesale_pricing_save', 10, 1 );
function gum_woo_wholesale_pricing_save( $product_id ) {
    if( isset($_POST['_wholesale_price']) && $_POST['_wholesale_price'] >= 0 )
        update_post_meta( $product_id, '_wholesale_price', $_POST['_wholesale_price'] );
}

//assign the wholesale price for wholesaler we will need to hook into woocommerce_get_price filter
add_filter( 'woocommerce_get_price', 'gum_woo_wholesale_pricing_return', 10, 2);
function gum_woo_wholesale_pricing_return( $price, $product ) {
    if( gum_woo_wholesale_pricing_applies() && gum_woo_wholesale_price_get($product) > 0 )
        $price = gum_woo_wholesale_price_get($product);
    	
    return $price;
}

//add Wholesale Pricing input to the Variable product editing page
add_action( 'woocommerce_product_after_variable_attributes', 'gum_woo_wholesale_pricing_field_var', 10, 3 );
function gum_woo_wholesale_pricing_field_var( $loop, $variation_data, $variation ){ 
	
	?>
    <tr class="wholesale_price_row">
        <td>
            <div>
                <label><?php _e( 'Wholesale Price:', 'woocommerce' ); ?></label>
                    <input type="text" size="5" name="variable_wholesale_price[<?php echo $loop; ?>]" value="<?php if ( isset( $variation_data['_wholesale_price'][0] ) ) echo esc_attr( $variation_data['_wholesale_price'][0] ); ?>" step="1" min="0" />
            </div>
        </td>
    </tr>
    <?php
}

//save the wholesale price value
add_action( 'woocommerce_save_product_variation', 'gum_woo_wholesale_pricing_field_var_save', 10, 2 );
function gum_woo_wholesale_pricing_field_var_save($variation_id, $i) {
    if( isset($_POST['variable_wholesale_price'][$i]) )
        update_post_meta( $variation_id, '_wholesale_price', $_POST['variable_wholesale_price'][$i]);
}


add_filter( 'woocommerce_variation_price_html', 'gum_woo_wholesale_pricing_field_var_return', 10, 2);
add_filter( 'woocommerce_variation_sale_price_html', 'gum_woo_wholesale_pricing_field_var_return', 10, 2);
function gum_woo_wholesale_pricing_field_var_return( $price, $product ) {
    if( isset($product->product_custom_fields['_wholesale_price'][0]) )
        $wholesale_price = $product->product_custom_fields['_wholesale_price'][0];
    else
        $wholesale_price = '';

    if( gum_woo_wholesale_pricing_applies() && $wholesale_price > 0 )
        return woocommerce_price( $wholesale_price );

    return $price;
}

//add wholesale pricing notice
//add_filter( 'woocommerce_before_main_content', 'gum_woo_wholesale_pricing_notice', 10, 2);
function gum_woo_wholesale_pricing_notice() {
	
	if( gum_woo_sale_pricing_applies() ) {
		$notice = '<span class="notice-wholesale"> Wholesale Pricing </span>';
	} else {
		$notice = '';
	}
	
	echo $notice;
}

add_filter( 'woocommerce_get_price_html', 'gum_woo_wholesale_pricing_label', 10, 2);
function gum_woo_wholesale_pricing_label( $price, $product ) {
	
	 if( gum_woo_wholesale_pricing_applies() && gum_woo_wholesale_price_get($product) > 0 && is_singular() ) {
		$text = '<span class="label-wholesale"> Wholesale </span>';
	} else {
		$text = '';
	}
	
	return $price .' '. $text;
}