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.planning/PROJECT.md

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+# Recipe (working title)
+
+## What This Is
+
+A mobile-first meal planning app for a small household — pick recipes for the week, fill a calendar across five meal slots per day, and watch pantry gaps + shopping lists emerge from the plan. Kotlin Multiplatform targeting iOS primarily, with Android, Desktop, and Wasm as secondary targets. Built for me + my partner (shared household plan) with a handful of family/friends as authorized users on the same self-hosted backend.
+
+## Core Value
+
+**"My week is planned."** I pick recipes, the calendar fills up, and I know what we're eating. Everything else — pantry tracking, shopping list, nutrition numbers — exists to reinforce that one moment.
+
+## Requirements
+
+### Validated
+
+(None yet — ship to validate)
+
+### Active
+
+**Authentication & identity**
+- [ ] Users sign in via the user's self-hosted Authentik instance (OIDC)
+- [ ] Sessions persist across app launches; offline access works with cached credentials
+
+**Household sharing**
+- [ ] Two users (me + partner) share one household: one plan, one pantry, one shopping list
+- [ ] Changes by either user converge on all devices when online
+
+**Recipes (browse & detail)**
+- [ ] User can browse a curated recipe catalog with a grid view
+- [ ] User can filter recipes by meal slot, tags, and cooking time
+- [ ] User can search recipes by title/tag
+- [ ] User can open a recipe detail view with ingredients, steps, and nutrition per serving
+
+**Meal planner (hero feature)**
+- [ ] User can view a calendar of days and see planned meals per day
+- [ ] User can add recipes to any of 5 slots/day (śniadanie, drugie śniadanie, obiad, przekąska, kolacja)
+- [ ] User can remove or replace a meal entry
+- [ ] User can adjust servings on a meal entry
+- [ ] User can customize a meal entry: swap ingredients (substitutions), exclude ingredients, add extras, override amounts
+- [ ] User can select a specific product (pack size) for an ingredient in a meal entry
+- [ ] User can mark a meal slot as "skipped" for a day
+- [ ] User sees daily nutrition totals (kcal, protein, fat, carbs) computed from the plan
+
+**Pantry**
+- [ ] User can view current pantry inventory grouped by category
+- [ ] User can add/update quantities manually in the pantry
+- [ ] User sees which ingredients fall short over a chosen planning horizon
+- [ ] User can filter pantry by category and by shortfall status
+
+**Shopping list**
+- [ ] User can select days from the plan to generate a shopping list
+- [ ] Shopping list aggregates ingredient needs across selected days minus pantry
+- [ ] Shopping list groups items by category for an efficient store trip
+- [ ] User can mark items as bought during a shopping session; marked items are removed from active needs and added to pantry
+
+**Offline + sync**
+- [ ] App is fully usable offline: read and write plans, pantry, shopping list
+- [ ] Local changes sync to the backend when connectivity returns, without data loss
+- [ ] Conflicts between two household members' concurrent edits resolve deterministically (last-write-wins for MVP; revisit if it hurts)
+
+**Polish UI foundation**
+- [ ] All user-facing strings are externalized into resource files (i18n-ready), even though v1 ships Polish only
+- [ ] UI uses a Liquid-Glass-inspired visual language (translucent surfaces, blur, soft depth) implemented in Compose Multiplatform
+- [ ] Visual hierarchy is less cramped than the mockup (more breathing room, calmer typography)
+- [ ] iOS app feels iOS-idiomatic within Compose's constraints (tab bar placement, navigation patterns, safe areas, dark mode)
+
+### Out of Scope
+
+**For v1 (deferred to later phases / milestones):**
+- In-app recipe authoring — *v1 seeds the DB manually; authoring in-app comes next phase*
+- Recipe sharing between users/households — *future feature; households are isolated in v1*
+- Nutrition goal tracking (targets, streaks, deficits) — *v1 shows numbers informationally only*
+- English and other language copy — *code is i18n-ready but v1 ships Polish only*
+- True native iOS 26 Liquid Glass via SwiftUI interop — *Compose approximation for v1; revisit only if real-device chrome feels clearly inadequate*
+- Desktop and Wasm as shipped products — *Desktop useful for hot-reload dev; Wasm is a possible future target, neither is a v1 deliverable*
+- Sign in with Apple as a first-class button — *user's Authentik handles auth; Apple can be federated upstream in Authentik if needed later*
+
+**Permanently out of scope (explicit exclusions):**
+- Social features: comments, ratings, recipe feeds, public profiles — *this is a private household app, not a community product*
+- Meal-plan marketplaces / paid plans — *personal-use product*
+- Grocery delivery integrations (Instacart, etc.) — *Polish market + small scope; not worth the integration cost*
+- Barcode scanning / receipt OCR for pantry updates — *manual entry is fine for a 2-person household*
+- AI-generated recipes — *curated catalog is the value*
+
+**Deliberately not carried forward from the mockup:**
+- The mockup's seed data (~80 ingredients, ~30 recipes) — *user chose to start the catalog fresh*
+- The mockup's visual design — *full visual rebuild; mockup is functional reference only*
+- The mockup's localStorage data model — *server-backed with local cache replaces it*
+
+## Context
+
+**Codebase state.** The `~/dev/repo/recipe` directory is a freshly-generated Kotlin Multiplatform Compose template from IntelliJ with four modules: `composeApp` (Android + Desktop + iOS shared UI), `iosApp` (iOS bootstrap), `server` (Ktor, not yet written), and `shared` (common code). No app logic exists yet — this is effectively greenfield with the build infra in place.
+
+**Reference implementation.** The user built a working PWA at `~/dev/repo/recipe-mockup/` (vanilla JS + Tailwind CDN + nginx/Docker). It implements the same four views (Recipe List, Meal Planner, Pantry, Shopping List) and has mature logic worth mining as a *functional* spec — particularly planner entry customization (substitutions, amount overrides, product selection), shortfall computation over a horizon, and shopping-list aggregation with "bought" session tracking. The mockup's UI design is **not** being carried forward; the user is redesigning visuals around a Liquid-Glass-inspired language.
+
+**Users.** Authorized users only, behind the user's Authentik. Primary user is the author; secondary is their partner (household sharing from day 1); a handful of family/friends may use their own household accounts. Not an App Store public launch — personal / close-circle use.
+
+**Infra.** User runs a homelab. Authentik is already installed. The Ktor backend will run on the same server (containerized). No managed cloud dependencies planned.
+
+**Language & platform.** Polish-only UI for v1 (strings externalized for future i18n). iOS is the primary daily driver; Android deployed later for friends; Desktop useful for development (hot reload); Wasm is aspirational.
+
+**Liquid Glass decision.** True iOS 26 Liquid Glass (refractive material, specular highlights, morphing chrome) is a SwiftUI-native feature that Compose on iOS cannot reproduce exactly (Compose uses Skia, not Metal-native glass material). The v1 plan is: Compose-only approximation (blur + translucency + gradients) everywhere, measure real-device performance and visual quality, and **only** selectively add SwiftUI interop for the chrome (tab bar, nav bar) if the approximation feels insufficient. This avoids upfront interop complexity for 90%+ of the UI.
+
+## Constraints
+
+- **Tech stack**: Kotlin Multiplatform + Compose Multiplatform for UI, Ktor for server, Authentik OIDC for auth — Locked; aligns with user's skills + self-hosted infra
+- **Primary platform**: iOS — Must feel good here first; other platforms are secondary
+- **Hosting**: Self-hosted on user's existing homelab (alongside Authentik) — No managed cloud; implies containerized deploy, self-managed DB, reverse proxy
+- **Offline**: Full offline read/write is required — User will use the shopping list in-store where signal is unreliable; online-only is unacceptable
+- **Audience size**: ~5–10 authenticated users total — Don't over-engineer multi-tenancy, rate limiting, or horizontal scaling
+- **Language**: Polish UI for v1, i18n-ready code — All strings must be externalized from day 1 to avoid costly retrofit later
+- **Data seeding**: Catalog starts empty; user will author recipes directly in DB for MVP — Need admin-friendly seeding path (SQL migrations, JSON fixtures, or CLI tool)
+- **Visual direction**: Liquid-Glass-inspired (Compose approximation) — Bright mockup palette is being replaced; design needs to be reworked as part of the rebuild
+
+## Key Decisions
+
+| Decision | Rationale | Outcome |
+|----------|-----------|---------|
+| KMP with Compose Multiplatform for UI | iOS-primary + Android secondary + Desktop/Wasm optional; single codebase for 90%+ of UI | — Pending |
+| Household-sharing from day 1 (me + partner share one plan) | Core use case is cooking together; per-user + later-sharing would force data-model rewrite | — Pending |
+| Authentik OIDC as sole auth provider for MVP | User already runs Authentik; self-hosted == aligned; Apple Sign-in likely not required for App Store since Authentik is user's own IdP, not a third-party social login | — Pending |
+| Server lives on user's homelab alongside Authentik | Existing infra, zero managed-cloud cost, same ops surface | — Pending |
+| Offline-first with last-write-wins sync | Grocery-store usage demands offline; conflict resolution overkill for a 2-person household | — Pending |
+| Compose-only Liquid Glass approximation for v1 | Real iOS 26 Liquid Glass requires SwiftUI interop; approximation keeps single codebase; revisit only if chrome feels inadequate on real device | — Pending |
+| Polish-only strings, i18n-ready infrastructure | Single-language content for v1 speed; externalized strings prevent future rewrite | — Pending |
+| Start catalog fresh (don't port mockup seed data) | Mockup data is a reference, not production content; user wants to re-curate | — Pending |
+| Nutrition is informational only in v1 | Keep scope tight; tracking/goals are a natural v2 if usage patterns justify | — Pending |
+| Mockup is functional spec only, not visual spec | Visual direction is changing (Liquid Glass); logic is mature and worth mining | — Pending |
+
+## Evolution
+
+This document evolves at phase transitions and milestone boundaries.
+
+**After each phase transition** (via `/gsd-transition`):
+1. Requirements invalidated? → Move to Out of Scope with reason
+2. Requirements validated? → Move to Validated with phase reference
+3. New requirements emerged? → Add to Active
+4. Decisions to log? → Add to Key Decisions
+5. "What This Is" still accurate? → Update if drifted
+
+**After each milestone** (via `/gsd-complete-milestone`):
+1. Full review of all sections
+2. Core Value check — still the right priority?
+3. Audit Out of Scope — reasons still valid?
+4. Update Context with current state
+
+---
+*Last updated: 2026-04-23 after initialization*