ui/phase-15: planet inspector production controls + order-draft collapse
Adds the second end-to-end command (`setProductionType`) with a collapse-by-`planetNumber` rule on the order draft, the segmented production-controls component on the planet inspector, the FBS encoder/decoder pair for `CommandPlanetProduce`, and the `localShipClass` projection on `GameReport`. Forecast number is deferred and tracked in the new `ui/docs/calc-bridge.md`.
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Ilia Denisov
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# Calc bridge
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The Galaxy frontend renders predictive numbers (free production
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potential, forecast output for a chosen production type, ship build
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progress, tech progress) that depend on the same formulas the engine
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uses at turn cutoff. To keep one source of truth, those formulas live
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in Go under `pkg/calc/` and are surfaced to the UI through a planned
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Go → WASM → TypeScript bridge mounted under `ui/core/calc/` and a
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matching TS adapter in `ui/frontend/src/`.
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The bridge does not exist yet. This document is the audit trail for
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what it must expose, what is already in place, and what is missing.
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## Current `pkg/calc/` exports
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| Function | Purpose |
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| ------------------------------------------------------ | ------------------------------------------------------------------------------------------------ |
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| `ShipProductionCost(shipEmptyMass float64) float64` | Production units required per unit of ship empty mass (×10). |
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| `PlanetProduceShipMass(L, Mat, Res float64) float64` | Ship mass produced per turn given free production `L`, material stockpile `Mat`, resources `Res`.|
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| `DriveEffective`, `Speed`, `EmptyMass`, `FullMass`, … | Ship-level derivations (`pkg/calc/ship.go`). |
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| `ValidateShipTypeValues`, `CheckShipTypeValueDWSC` | Ship-design validators (`pkg/calc/validator.go`). |
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Nothing else lives in `pkg/calc/` today. Production-side formulas
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(industry / materials / per-tech research / production capacity) sit
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in `game/internal/model/game/planet.go` and `…/science.go` and have
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never been exported.
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## Required calc functions per UI feature
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The table below tracks what UI features need from the bridge and
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whether the underlying Go function exists.
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| UI feature | Go formula | In `pkg/calc/`? | Surfaced to TS? |
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| ------------------------------------------------- | --------------------------------------------------------------------------------------------------------------------------- | :-------------: | :-------------: |
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| Free production potential (`freeIndustry`) | `Planet.ProductionCapacity` → `industry*0.75 + population*0.25` (`game/internal/model/game/planet.go`) | no | no |
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| Industry production output per turn | `Planet.ProduceIndustry(freeProduction)` (`planet.go`); `freeProduction/5` modulo material constraint | no | no |
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| Materials production output per turn | `Planet.ProduceMaterial(freeProduction)` (`planet.go`); `freeProduction * resources` | no | no |
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| Per-tech research progress (DRIVE/WEAPONS/…) | `ResearchTech` (`game/internal/model/game/science.go`); `freeProduction / 5000` per tech level | no | no |
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| Custom-science progress | weighted form of `ResearchTech` driven by `Race.Sciences[].(Drive\|Weapons\|Shields\|Cargo)` (`science.go`) | no | no |
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| Ship build progress | `PlanetProduceShipMass(L, Mat, Res) / ShipProductionCost(class.EmptyMass)` (combination of two existing exports) | partial | no |
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`partial` means the Go primitives exist in `pkg/calc/` but the
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composition (and the conversion of TS-side `ReportPlanet`/
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`ShipClass` to the formula inputs) is not implemented anywhere.
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## Phase 15 waiver
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Phase 15 ships the inspector's planet production controls
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(segmented control + sub-pickers + collapse-by-`planetNumber`
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order command) but **deliberately does not surface the per-type
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forecast number**. The planning gate explicitly raised the gap as
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a blocker per the plan's audit clause ("if any are missing in
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`pkg/calc/`, raise as blocker") and the project owner approved
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deferring the forecast to a dedicated future bridge phase. The
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inspector still renders the existing `freeIndustry` row (free
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production potential) — that number is computed engine-side and
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ships in the report payload, so no calc-bridge access is required
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for it today.
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Acceptance criterion 3 of Phase 15 ("forecast output number
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reflects the chosen production type and matches `pkg/calc/`
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outputs") is therefore intentionally not satisfied; the rewritten
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Phase 15 stage text records this decision and points back at this
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document.
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## Planned bridge shape (follow-up phase)
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When the bridge phase lands, the contract should be:
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1. Promote every formula in the table above into `pkg/calc/` so the
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engine and the UI share one Go-side implementation. The engine
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continues to call them through `game/internal/...` wrappers.
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2. Mount a `ui/core/calc/` Go module that re-exports the subset the
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UI needs. Keep it WASM-friendly (no `unsafe`, no goroutines,
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simple in/out values).
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3. Wire the WASM glue in `ui/wasm/main.go` so each calc function is
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reachable from `globalThis.galaxyCore`.
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4. Add a TypeScript adapter under `ui/frontend/src/platform/core/`
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that wraps the WASM calls in typed helpers
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(`forecastIndustry(freeProduction, …)` etc.).
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5. Update this document with the live function inventory and
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delete the "missing" rows above.
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