CUB-37: Implement cost-per-print calculation service #18

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overseer merged 3 commits from agent/dex/CUB-37-cost-per-print into dev 2026-04-27 17:25:38 -04:00

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Dex commented 2026-04-27 13:59:51 -04:00

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What

Implement cost-per-print (COGS) calculation service for Extrudex.

New files

• Domain/Interfaces/ICostPerPrintService.cs — Interface + CostPerPrintResult domain model
• Infrastructure/Services/CostPerPrintService.cs — Implementation with graceful handling of missing cost data
• API/DTOs/PrintJobs/CostPerPrintDtos.cs — Request/response DTOs for cost endpoints
• API/Controllers/CostAnalysisController.cs — Spool-level cost analysis endpoint (POST /api/cost-analysis/spool)

Modified files

• API/Controllers/PrintJobsController.cs — Added POST /api/printjobs/{id}/cost endpoint + injected ICostPerPrintService
• Program.cs — Registered ICostPerPrintService in DI

API contracts for Rex

• POST /api/printjobs/{id}/cost → CostPerPrintResponse
• POST /api/cost-analysis/spool → SpoolCostResponse

Design decisions

• Formula: cost_per_print = grams_derived × (purchase_price / weight_total_grams)
• Missing cost data returns warnings, never throws
• Cost per gram rounded to 6 decimal places, cost per print to 4
• Spool-level aggregation distinguishes jobs with complete vs incomplete cost data

Linear

Closes CUB-37

## What Implement cost-per-print (COGS) calculation service for Extrudex. ### New files - `Domain/Interfaces/ICostPerPrintService.cs` — Interface + `CostPerPrintResult` domain model - `Infrastructure/Services/CostPerPrintService.cs` — Implementation with graceful handling of missing cost data - `API/DTOs/PrintJobs/CostPerPrintDtos.cs` — Request/response DTOs for cost endpoints - `API/Controllers/CostAnalysisController.cs` — Spool-level cost analysis endpoint (`POST /api/cost-analysis/spool`) ### Modified files - `API/Controllers/PrintJobsController.cs` — Added `POST /api/printjobs/{id}/cost` endpoint + injected `ICostPerPrintService` - `Program.cs` — Registered `ICostPerPrintService` in DI ### API contracts for Rex - `POST /api/printjobs/{id}/cost` → `CostPerPrintResponse` - `POST /api/cost-analysis/spool` → `SpoolCostResponse` ### Design decisions - Formula: `cost_per_print = grams_derived × (purchase_price / weight_total_grams)` - Missing cost data returns warnings, never throws - Cost per gram rounded to 6 decimal places, cost per print to 4 - Spool-level aggregation distinguishes jobs with complete vs incomplete cost data ## Linear Closes CUB-37

Dex added 1 commit 2026-04-27 13:59:52 -04:00

CUB-37: implement cost-per-print calculation service 6aa31f4be3

Rex added 1 commit 2026-04-27 14:30:08 -04:00

Merge remote-tracking branch 'origin/dev' into fix-pr-18 ... 5b9dde13fe

# Conflicts:
#	backend/API/Controllers/PrintJobsController.cs

overseer added 1 commit 2026-04-27 17:25:24 -04:00

Merge branch 'dev' into agent/dex/CUB-37-cost-per-print 0378aee43e

overseer scheduled this pull request to auto merge when all checks succeed 2026-04-27 17:25:31 -04:00

overseer merged commit 174dd294e9 into dev 2026-04-27 17:25:38 -04:00

overseer deleted branch agent/dex/CUB-37-cost-per-print 2026-04-27 17:25:38 -04:00

overseer referenced this issue from a commit 2026-04-27 17:25:39 -04:00

Merge pull request 'CUB-37: Implement cost-per-print calculation service' (#18) from agent/dex/CUB-37-cost-per-print into dev

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Reference: CubeCraft-Creations/Extrudex#18