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openspec/changes/enterprise-gaming-weather/proposal.md

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+# OpenSpec Change: enterprise-gaming-weather
+
+- **Change ID**: enterprise-gaming-weather
+- **Package**: `@suaveplan/weather`
+- **Category**: gaming/world
+- **Target path**: `gaming/world/weather`
+- **Status**: PROPOSED
+- **Date**: 2026-04-24
+- **Reference spec**: `/mnt/s/web/suaveplan/enterprise/weather.md`
+
+---
+
+## Summary
+
+Deliver `@suaveplan/weather` on the genesis branch from scratch at enterprise quality. The package provides dynamic weather simulation with smooth transitions, regional zones, and gameplay effects. A `WeatherSystem` holds the current `WeatherState` (temperature, precipitation, wind, visibility, lightning) and advances it by transitioning toward a `WeatherPreset`; `WeatherZone` maps world regions to preset overrides; a `WeatherTransition` interpolates between two presets over a configurable duration. Genesis adds Zod preset schemas, structured errors, OTel weather-state gauge, injectable clock and RNG, and 100% coverage.
+
+---
+
+## Current-state audit (genesis)
+
+Package does not exist on genesis yet — fresh build.
+
+---
+
+## Available workspace deps on genesis
+
+| Package | Role |
+|---|---|
+| `@suaveplan/error` (`workspace:^`) | `WeatherError`; `WEATHER.*` codes |
+| `@suaveplan/types` (`workspace:^`) | `Clock`, `Rng` |
+| `@suaveplan/events` (`workspace:^`) | `weather:changed`, `weather:lightning`, `weather:zone_entered` events |
+| `@suaveplan/day-night` (`workspace:^`) | `DayNightClock` for time-based weather probability |
+| `zod` (`catalog:forms`) | `WeatherPreset`, `WeatherZone` schemas |
+| `@opentelemetry/api` (`catalog:observability`) | Weather-state change counter |
+
+---
+
+## Public API surface
+
+```ts
+interface WeatherPreset {
+  name: string
+  temperature: number      // celsius
+  precipitation: number    // 0–1
+  windSpeed: number        // m/s
+  windDirection: number    // degrees
+  visibility: number       // 0–1 (1=clear, 0=zero visibility)
+  fogDensity: number       // 0–1
+  cloudCover: number       // 0–1
+  lightningProbability?: number  // per-minute probability 0–1
+}
+
+interface WeatherState extends WeatherPreset {
+  readonly isTransitioning: boolean
+  readonly transitionProgress: number  // 0–1
+}
+
+function createWeatherSystem(options: WeatherSystemOptions): WeatherSystem
+
+interface WeatherSystemOptions {
+  initialPreset: WeatherPreset
+  transitionDuration?: number   // seconds, default 60
+  clock?: Clock
+  rng?: Rng
+}
+
+interface WeatherSystem {
+  transitionTo(preset: WeatherPreset, duration?: number): void
+  tick(dt: number): void
+  readonly state: WeatherState
+  readonly currentPreset: WeatherPreset
+}
+
+// Weather zones
+function createWeatherZone(options: WeatherZoneOptions): WeatherZone
+
+interface WeatherZoneOptions {
+  id: string
+  center: Vec3
+  radius: number
+  preset: WeatherPreset
+  blendRadius?: number    // blend distance at zone edge
+}
+
+interface WeatherZone {
+  readonly id: string
+  getBlendFactor(position: Vec3): number   // 0 = outside, 1 = fully inside
+}
+
+function blendWeather(base: WeatherPreset, override: WeatherPreset, factor: number): WeatherPreset
+```
+
+### Error codes
+
+```ts
+type WeatherErrorCode =
+  | 'WEATHER_INVALID_PRESET'
+  | 'WEATHER_ZONE_NOT_FOUND'
+  | 'WEATHER_TRANSITION_INVALID'
+```
+
+---
+
+## File layout
+
+```text
+gaming/world/weather/
+  package.json
+  tsconfig.json
+  vitest.config.ts
+  src/
+    index.ts
+    error-codes.ts
+    constants/index.ts
+    types/common.ts
+    types/common.md
+    core/
+      weather-system/
+        weather-system.ts
+        weather-system.md
+        weather-system.types.ts
+        weather-system.test.ts
+        index.ts
+      weather-zone/
+        weather-zone.ts
+        weather-zone.md
+        weather-zone.types.ts
+        weather-zone.test.ts
+        index.ts
+    presets/
+      index.ts    # CLEAR, RAIN, STORM, SNOW, FOG built-in presets
+    utils/
+      blend.ts
+      blend.md
+      blend.test.ts
+  tests/
+    integration.test.ts
+```
+
+---
+
+## Impact
+
+**Downstream**: `@suaveplan/r3f-weather` renders rain particles, fog, lightning effects driven by `WeatherState`. Prerequisites: `@suaveplan/error`, `@suaveplan/types`, `@suaveplan/events`, `@suaveplan/day-night`.