Add percentage diff column and price floor based on current price

Changes:
- Added "% Diff" column showing percentage difference between your price and suggested
- Changed minimum price logic: uses "Current Price - Margin%" instead of cost-based
- Updated settings description to explain the new logic
- Example: With 10% margin, €100 product won't be suggested below €90

This works better for stores without cost data - protects against excessive price drops.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

admin/class-informatiq-sp-admin.php

@@ -485,7 +485,9 @@ class Informatiq_SP_Admin {
 		       value="<?php echo esc_attr( $value ); ?>" min="0" max="100" step="0.01" class="small-text">
 		<span>%</span>
 		<p class="description">
-			<?php esc_html_e( 'Minimum profit margin to maintain. Prices will never go below (Cost + Margin%).', 'informatiq-smart-pricing' ); ?>
+			<?php esc_html_e( 'Maximum price reduction allowed. Suggested prices will never go below (Current Price - Margin%).', 'informatiq-smart-pricing' ); ?>
+			<br>
+			<em><?php esc_html_e( 'Example: With 10%, a €100 product will never be suggested below €90.', 'informatiq-smart-pricing' ); ?></em>
 		</p>
 		<?php
 	}
@@ -621,7 +623,9 @@ class Informatiq_SP_Admin {
 								<th><?php esc_html_e( 'Product', 'informatiq-smart-pricing' ); ?></th>
 								<th><?php esc_html_e( 'Your Price', 'informatiq-smart-pricing' ); ?></th>
 								<th><?php esc_html_e( 'Suggested', 'informatiq-smart-pricing' ); ?></th>
-								<th><?php esc_html_e( 'Gain/Loss', 'informatiq-smart-pricing' ); ?></th>
+								<th title="<?php esc_attr_e( 'Percentage difference from your price', 'informatiq-smart-pricing' ); ?>">
+									<?php esc_html_e( '% Diff', 'informatiq-smart-pricing' ); ?>
+								</th>
 								<th title="<?php esc_attr_e( 'Predicted change in impressions', 'informatiq-smart-pricing' ); ?>">
 									<?php esc_html_e( 'Impr.', 'informatiq-smart-pricing' ); ?>
 								</th>
@@ -897,12 +901,32 @@ class Informatiq_SP_Admin {
 				// Calculate potential gain and determine if update is beneficial.
 				$suggested_price = $insight['suggested_price'] ?? null;
 				$potential_gain = null;
+				$percent_diff = null;
 				$should_update = false;
 
+				// Get minimum margin setting.
+				$min_margin = (float) get_option( 'informatiq_sp_minimum_margin', 10 );
+
 				if ( $suggested_price && $local_price_incl_tax ) {
 					$potential_gain = round( $suggested_price - $local_price_incl_tax, 2 );
-					// Suggest update if Google recommends a different price.
+
-					$should_update = abs( $potential_gain ) > 0.05;
+					// Calculate percentage difference.
+					$percent_diff = round( ( ( $suggested_price - $local_price_incl_tax ) / $local_price_incl_tax ) * 100, 1 );
+
+					// Calculate minimum allowed price (current price - margin%).
+					$min_allowed_price = $local_price_incl_tax * ( 1 - ( $min_margin / 100 ) );
+
+					// Only suggest update if:
+					// 1. Google recommends a different price (more than 0.05 diff)
+					// 2. Suggested price is above our minimum allowed price
+					$should_update = abs( $potential_gain ) > 0.05 && $suggested_price >= $min_allowed_price;
+
+					// If suggested is below minimum, cap it.
+					if ( $suggested_price < $min_allowed_price ) {
+						$suggested_price = round( $min_allowed_price, 2 );
+						$potential_gain = round( $suggested_price - $local_price_incl_tax, 2 );
+						$percent_diff = round( ( ( $suggested_price - $local_price_incl_tax ) / $local_price_incl_tax ) * 100, 1 );
+					}
 				}
 
 				$comparison[] = array(
@@ -913,6 +937,7 @@ class Informatiq_SP_Admin {
 					'price_type'                  => $price_type,
 					'google_price'                => $insight['google_price'] ?? null,
 					'suggested_price'             => $suggested_price,
+					'percent_diff'                => $percent_diff,
 					'potential_gain'              => $potential_gain,
 					'predicted_impressions_change' => $insight['predicted_impressions_change'] ?? null,
 					'predicted_clicks_change'     => $insight['predicted_clicks_change'] ?? null,

assets/js/admin.js

@@ -307,19 +307,19 @@
 					var suggestedPrice = product.suggested_price ? data.currency + parseFloat(product.suggested_price).toFixed(2) : '-';
 					var priceLabel = product.price_type === 'sale' ? ' <small>(sale)</small>' : '';
 
-					// Gain/loss styling
+					// Percentage difference styling
-					var gainHtml = '-';
+					var percentDiffHtml = '-';
-					var gainStyle = '';
+					var percentDiffStyle = '';
-					if (product.potential_gain !== null) {
+					if (product.percent_diff !== null) {
-						var gain = parseFloat(product.potential_gain);
+						var pct = parseFloat(product.percent_diff);
-						if (gain > 0) {
+						if (pct > 0) {
-							gainHtml = '+' + data.currency + gain.toFixed(2);
+							percentDiffHtml = '+' + pct.toFixed(1) + '%';
-							gainStyle = 'color: #00a32a; font-weight: bold;';
+							percentDiffStyle = 'color: #00a32a; font-weight: bold;';
-						} else if (gain < 0) {
+						} else if (pct < 0) {
-							gainHtml = '-' + data.currency + Math.abs(gain).toFixed(2);
+							percentDiffHtml = pct.toFixed(1) + '%';
-							gainStyle = 'color: #d63638;';
+							percentDiffStyle = 'color: #d63638;';
 						} else {
-							gainHtml = data.currency + '0.00';
+							percentDiffHtml = '0%';
 						}
 					}
 
@@ -351,7 +351,7 @@
 					html += '<td><a href="post.php?post=' + product.id + '&action=edit" title="SKU: ' + product.sku + '">' + self.truncate(product.name, 40) + '</a></td>';
 					html += '<td>' + localPrice + priceLabel + '</td>';
 					html += '<td>' + suggestedPrice + '</td>';
-					html += '<td style="' + gainStyle + '">' + gainHtml + '</td>';
+					html += '<td style="' + percentDiffStyle + '">' + percentDiffHtml + '</td>';
 					html += '<td style="' + imprStyle + '">' + imprChange + '</td>';
 					html += '<td style="' + clickStyle + '">' + clickChange + '</td>';
 					html += '<td style="' + convStyle + '">' + convChange + '</td>';