fix(cli): reconstruct service Details from CSV Engine/Deployment columns (closes #572)

[cristim]

What

Make --input-csv purchasing work for RDS by reconstructing rec.Details from the CSV's Engine and Deployment columns.

Why

loadRecommendationsFromCSV → parseCSVRecord parsed only Service, Region, ResourceType, Account, AccountName, Term, PaymentOption, Count, EstimatedSavings. It never read Engine/Deployment, so rec.Details stayed nil. The RDS purchase path can't proceed without it:

// providers/aws/services/rds/client.go  findOfferingID
details, ok := rec.Details.(*common.DatabaseDetails)
if !ok || details == nil {
    return "", fmt.Errorf("invalid service details for RDS")
}

So every RDS row failed with invalid service details for RDS under --input-csv … --purchase, before any AWS call. This blocks the edit-the-CSV-then-purchase workflow (the tool has no in-flow exclusion flag).

Change

• parseCSVRecord reconstructs Details from the Engine/Deployment columns, mirroring the writer (extractEngine/extractDeployment emit DatabaseDetails / CacheDetails / ComputeDetails), so a CSV the tool wrote round-trips losslessly. Guarded on a non-empty Engine, so minimal CSVs and Savings Plans rows keep their previous nil-Details behavior. Engine is stored in Cost Explorer format ("Aurora MySQL"); findOfferingID already normalizes it.
• parseCSVRecords skips the trailing TOTAL summary row, so feeding the tool its own output no longer parses TOTAL as a bogus recommendation ("Service client not yet implemented for TOTAL").

Out of scope (by design)

Multi-account purchasing from a single CSV. Purchases run centrally in the --profile account; the Account column stays informational. This is the intended behavior, not a gap.

Testing

• go build ./cmd/..., go vet ./cmd/ clean.
• go test ./cmd/ → 720 pass.
• New table cases in TestLoadRecommendationsFromCSV:
  • Engine + Deployment reconstruct *DatabaseDetails (Aurora MySQL/single-az, MySQL/multi-az), *CacheDetails (ElastiCache), *ComputeDetails (EC2 platform).
  • No Engine column leaves Details nil (Savings Plans / minimal CSV).
  • TOTAL summary row is skipped.
• Manual dry-run (--input-csv … --profile shift-prd, no --purchase): loads 22 recs / 85 instances cleanly and no longer emits the spurious "Processing TOTAL" block.

Closes #572

Summary by CodeRabbit

• Bug Fixes
  • CSV import now correctly ignores summary rows, preventing footer data from being interpreted as valid recommendations
  • Improved recommendation data reconstruction from CSV imports, properly mapping Engine and Deployment columns to the appropriate service-specific details for database, cache, and compute recommendations

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

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Run ID: 5ff70330-ac16-4ff6-8570-97a8cfff4bd9

📥 Commits

Reviewing files that changed from the base of the PR and between bc8831b and a23eaf3.

📒 Files selected for processing (2)

• cmd/multi_service_csv.go
• cmd/multi_service_csv_test.go

---

📝 Walkthrough

Walkthrough

CSV loader now reconstructs typed Details payloads (DatabaseDetails, CacheDetails, ComputeDetails) from Engine and Deployment columns when present, enabling service-specific purchase flows. Parser also filters out TOTAL summary rows to avoid parsing tool output as recommendations.

Changes

CSV Details Reconstruction

Layer / File(s)	Summary
Service Details reconstruction from Engine/Deployment cmd/multi_service_csv.go	parseCSVRecord now builds typed Details from Engine and Deployment columns: RDS→DatabaseDetails (Engine, AZConfig), ElastiCache→CacheDetails (Engine, NodeType from ResourceType), EC2→ComputeDetails (Platform from Engine). Nil when Engine is absent to preserve behavior for minimal CSVs.
TOTAL row filtering cmd/multi_service_csv.go	loadRecommendationsFromCSV skips records where Service equals TOTAL, preventing CSV export footer from being parsed as a recommendation.
Test coverage cmd/multi_service_csv_test.go	Validates Engine/Deployment columns trigger correct Details reconstruction for RDS, ElastiCache, and EC2; verifies Details stays nil without Engine; confirms TOTAL rows are ignored.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~12 minutes

Possibly related issues

• fix(cli): --input-csv drops Engine/Deployment, RDS purchase fails with 'invalid service details' #572: Directly addresses the root cause—--input-csv now reconstructs Engine/Deployment columns into typed service Details, allowing RDS purchase flows to access the required DatabaseDetails (Engine, AZConfig) instead of failing with "invalid service details for RDS".

Suggested labels

impact/all-users, effort/m

Poem

A CSV walks in with tales to tell,
Engine and Deployment serve them well,
Details bloom where TOTAL would fall—
Now purchases work! No more wall. 🐰✨

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly summarizes the main change: reconstructing service Details from CSV Engine/Deployment columns, which is the primary objective of the changeset.
Linked Issues check	✅ Passed	The PR fully addresses all coding requirements from issue #572: Engine/Deployment parsing is restored, appropriate Details types are reconstructed for RDS/ElastiCache/EC2, non-empty Engine guards minimal CSVs, trailing TOTAL rows are skipped, and tests validate all scenarios.
Out of Scope Changes check	✅ Passed	All changes are directly related to the linked issue objectives: CSV parsing logic for Engine/Deployment, Details reconstruction, TOTAL row filtering, and corresponding test coverage. No unrelated modifications are present.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.

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✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/issue-572-csv-input-engine-deployment

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[cristim]

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