# Refactoring Summary: Server-Side Transformation

## Overview
Moved the job transformation logic from the Electron app to the Lambda function to enable server-side processing and sharing of types between codebases.

## Changes Made

### 1. Shared Types Directory (`/shared/types/`)
Created a shared types directory that both the Electron app and serverless Lambda can use:

- **`raw-job-data.interface.ts`** - Defines the `RawJobDataObject` interface with all fields from the decoded job data
- **`es-job-object.interface.ts`** - Defines the `ESJobObject` interface for the transformed estimate scrubber format
- **`index.ts`** - Exports all shared types for easy importing

### 2. Serverless Changes

#### `serverless/src/lib/transformEstimate.ts`
- Moved transformation logic from `src/main/estimate-scrubber/es-transformer.ts`
- Exports `transformJobForEstimateScrubber()` function
- Imports shared types from `../../../shared/types`
- Handles all field omissions and transformations server-side

#### `serverless/src/handlers/scrub.ts`
- Updated to receive `rawJob` instead of pre-transformed `estimate`
- Calls `transformJobForEstimateScrubber()` to transform on the server
- Sets `v_type` using the existing `getVehicleType()` function
- Updated TypeScript interfaces to use shared types

#### `serverless/package.json`
- Added `lodash` dependency
- Added `@types/lodash` dev dependency

#### `serverless/tsconfig.json`
- Updated `include` to add `"../shared/**/*"` for shared types access

### 3. Electron App Changes

#### `src/main/estimate-scrubber/estimate-scrubber.ts`
- Removed call to `TransformJobForEstimateScrubber()`
- Now sends raw job object directly to Lambda as `rawJob`
- Removed import of `es-transformer`
- Transformation now happens server-side

#### `tsconfig.node.json`
- Updated `include` array to add `"shared/**/*"` for shared types access

### 4. Files That Can Be Deprecated (Optional)
- `src/main/estimate-scrubber/es-transformer.ts` - Logic moved to serverless
- `src/main/estimate-scrubber/es-job-object.interface.ts` - Moved to shared types

## Benefits

1. **Single Source of Truth**: Types are defined once in `/shared/types/` and used by both codebases
2. **Server-Side Processing**: Transformation logic runs on Lambda, reducing client-side processing
3. **Easier Maintenance**: Updates to transformation logic or types only need to be made in one place
4. **Type Safety**: Both Electron app and Lambda use the same TypeScript interfaces
5. **Reduced Bundle Size**: Electron app no longer includes transformation logic

## API Contract Changes

### Before
```typescript
POST /scrub
{
  esApiKey: string,
  estimate: ESJobObject,  // Pre-transformed
  fileName: string
}
```

### After
```typescript
POST /scrub
{
  esApiKey: string,
  rawJob: RawJobDataObject  // Raw, untransformed
}
```

## Migration Notes

- The Lambda function now handles all transformation logic
- Ensure both codebases have access to the `/shared/types/` directory
- Run `npm install` in the serverless directory to get new dependencies
- The `fileName` parameter is now generated server-side based on the raw job data

## Testing Recommendations

1. Test that raw job objects are correctly sent from Electron to Lambda
2. Verify transformation logic produces identical output to previous version
3. Ensure PDF generation and report URLs are working correctly
4. Check that error handling still works as expected
5. Validate that logs are being written correctly with transformed data