telemetry(amazonq): TransformEvent metric on download ZIP #5905

## Problem
Need some more metrics emitted to capture lines of code submitted, lines
of code changed, and characters of code changed.

## Solution
Emit said metrics after parsing them from the download ZIP.

Author: dhasani23

packages/core/src/codewhisperer/models/model.ts

@@ -413,6 +413,8 @@ export class TransformByQState {
 
     private metadataPathSQL: string = ''
 
+    private linesOfCodeSubmitted: number | undefined = undefined
+
     private planFilePath: string = ''
     private summaryFilePath: string = ''
     private preBuildLogFilePath: string = ''
@@ -485,6 +487,10 @@ export class TransformByQState {
         return this.customBuildCommand
     }
 
+    public getLinesOfCodeSubmitted() {
+        return this.linesOfCodeSubmitted
+    }
+
     public getPreBuildLogFilePath() {
         return this.preBuildLogFilePath
     }
@@ -645,6 +651,10 @@ export class TransformByQState {
         this.customBuildCommand = command
     }
 
+    public setLinesOfCodeSubmitted(lines: number) {
+        this.linesOfCodeSubmitted = lines
+    }
+
     public setStartTime(time: string) {
         this.startTime = time
     }

packages/core/src/codewhisperer/service/transformByQ/transformApiHandler.ts

@@ -573,6 +573,7 @@ export async function getTransformationPlan(jobId: string) {
         const linesOfCode = Number(
             jobStatistics.find((stat: { name: string; value: string }) => stat.name === 'linesOfCode').value
         )
+        transformByQState.setLinesOfCodeSubmitted(linesOfCode)
         if (authType === 'iamIdentityCenter' && linesOfCode > CodeWhispererConstants.codeTransformLocThreshold) {
             plan += CodeWhispererConstants.codeTransformBillingText(linesOfCode)
         }

packages/core/src/codewhisperer/service/transformByQ/transformationResultsViewProvider.ts

@@ -10,7 +10,7 @@ import { parsePatch, applyPatches, ParsedDiff } from 'diff'
 import path from 'path'
 import vscode from 'vscode'
 import { ExportIntent } from '@amzn/codewhisperer-streaming'
-import { TransformByQReviewStatus, transformByQState } from '../../models/model'
+import { TransformationType, TransformByQReviewStatus, transformByQState } from '../../models/model'
 import { ExportResultArchiveStructure, downloadExportResultArchive } from '../../../shared/utilities/download'
 import { getLogger } from '../../../shared/logger'
 import { telemetry } from '../../../shared/telemetry/telemetry'
@@ -20,6 +20,7 @@ import * as CodeWhispererConstants from '../../models/constants'
 import { createCodeWhispererChatStreamingClient } from '../../../shared/clients/codewhispererChatClient'
 import { ChatSessionManager } from '../../../amazonqGumby/chat/storages/chatSession'
 import { setContext } from '../../../shared/vscode/setContext'
+import * as codeWhisperer from '../../client/codewhisperer'
 
 export abstract class ProposedChangeNode {
     abstract readonly resourcePath: string
@@ -402,6 +403,33 @@ export class ProposedTransformationExplorer {
                     `${CodeWhispererConstants.errorDeserializingDiffNotification} ${deserializeErrorMessage}`
                 )
             }
+
+            try {
+                const metricsPath = path.join(pathContainingArchive, ExportResultArchiveStructure.PathToMetrics)
+                const metricsData = JSON.parse(fs.readFileSync(metricsPath, 'utf8'))
+
+                await codeWhisperer.codeWhispererClient.sendTelemetryEvent({
+                    telemetryEvent: {
+                        transformEvent: {
+                            jobId: transformByQState.getJobId(),
+                            timestamp: new Date(),
+                            ideCategory: 'VSCODE',
+                            programmingLanguage: {
+                                languageName:
+                                    transformByQState.getTransformationType() === TransformationType.LANGUAGE_UPGRADE
+                                        ? 'JAVA'
+                                        : 'SQL',
+                            },
+                            linesOfCodeChanged: metricsData.linesOfCodeChanged,
+                            charsOfCodeChanged: metricsData.charactersOfCodeChanged,
+                            linesOfCodeSubmitted: transformByQState.getLinesOfCodeSubmitted(), // currently unavailable for SQL conversions
+                        },
+                    },
+                })
+            } catch (err: any) {
+                // log error, but continue to show user diff.patch with results
+                getLogger().error(`CodeTransformation: SendTelemetryEvent error = ${err.message}`)
+            }
         })
 
         vscode.commands.registerCommand('aws.amazonq.transformationHub.reviewChanges.acceptChanges', async () => {

packages/core/src/shared/utilities/download.ts

@@ -3,7 +3,6 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
-import path from 'path'
 import { CodeWhispererStreaming, ExportResultArchiveCommandInput } from '@amzn/codewhisperer-streaming'
 import { ToolkitError } from '../errors'
 import fs from '../fs/fs'
@@ -12,8 +11,9 @@ import fs from '../fs/fs'
  * This class represents the structure of the archive returned by the ExportResultArchive endpoint
  */
 export class ExportResultArchiveStructure {
-    static readonly PathToSummary = path.join('summary', 'summary.md')
-    static readonly PathToDiffPatch = path.join('patch', 'diff.patch')
+    static readonly PathToSummary = 'summary/summary.md'
+    static readonly PathToDiffPatch = 'patch/diff.patch'
+    static readonly PathToMetrics = 'metrics/metrics.json'
     static readonly PathToManifest = 'manifest.json'
 }