Implemented Rollback Functionality

README.md

@@ -49,9 +49,24 @@ TARGET_TAG=sale
 
 # Price adjustment percentage (positive for increase, negative for decrease)
 # Examples: 10 (increase by 10%), -15 (decrease by 15%), 5.5 (increase by 5.5%)
+# Note: Only used in "update" mode, ignored in "rollback" mode
 PRICE_ADJUSTMENT_PERCENTAGE=10
+
+# Operation mode - determines whether to update prices or rollback to compare-at prices
+# Options: "update" (default) or "rollback"
+# When not specified, defaults to "update" for backward compatibility
+OPERATION_MODE=update
 ```
 
+### Operation Mode Configuration
+
+The `OPERATION_MODE` environment variable controls the application behavior:
+
+- **`update` (default)**: Performs price adjustments using `PRICE_ADJUSTMENT_PERCENTAGE`
+- **`rollback`**: Sets prices to compare-at price values and removes compare-at prices
+
+When `OPERATION_MODE` is not specified, the application defaults to `update` mode for backward compatibility.
+
 ### Getting Your Shopify Credentials
 
 #### For Private Apps (Recommended):
@@ -84,6 +99,36 @@ or
 node src/index.js
 ```
 
+### Operation Modes
+
+The application supports two operation modes:
+
+#### Update Mode (Default)
+
+Adjusts product prices by a percentage:
+
+```bash
+npm run update
+```
+
+This performs the standard price adjustment functionality using the `PRICE_ADJUSTMENT_PERCENTAGE` setting.
+
+#### Rollback Mode
+
+Reverts prices by setting the main price to the compare-at price and removing the compare-at price:
+
+```bash
+npm run rollback
+```
+
+This is useful for reverting promotional pricing back to original prices. Products without compare-at prices will be skipped.
+
+**Operation Mode Indicators:**
+
+- The console output clearly displays which operation mode is active
+- Progress.md logs distinguish between "Price Update Operation" and "Price Rollback Operation"
+- Configuration summary shows the operation mode being used
+
 ### Debug Mode
 
 Before running the main script, you can use the debug mode to see what tags exist in your store and verify your target tag:
@@ -278,7 +323,9 @@ shopify-price-updater/
 
 ## Available Scripts
 
-- `npm start` - Run the main price update script
+- `npm start` - Run the price updater (defaults to update mode for backward compatibility)
+- `npm run update` - Run the price update script (explicitly set to update mode)
+- `npm run rollback` - Run the price rollback script (set prices to compare-at prices)
 - `npm run debug-tags` - Analyze all product tags in your store
 - `npm test` - Run the test suite (if implemented)