OpenTech-DB

Web Frontend

The frontend/ directory contains a React 19 SPA built with Vite 8, TypeScript, TailwindCSS, ECharts, and Leaflet.

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Start the dev server

cd frontend
npm install
npm run dev    # http://localhost:5173

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Views and components

Main catalogue (TechGrid + TechCard)

Entry point for browsing 55+ technologies. The SideNavBar allows filtering by category (generation, storage, transmission, conversion). The TopNavBar provides a full-text search bar. Results are paginated and displayed in a responsive grid.

• TechGrid.tsx — fetches a category’s technologies using React 19 use() inside a <Suspense> boundary; uses useDeferredValue on the search query for non-blocking typing.
• TechCard.tsx — summary card: name, category badge, OEO URI link, instance count. Click opens DetailsModal.

Technology detail (DetailsModal + TechCharts)

Full parameter view opened as a modal overlay:

• Instances table — all manufacturer/vintage variants with CAPEX, efficiency, lifetime, CO₂ factor.
• ECharts bar charts — side-by-side comparison of CAPEX (USD/kW), efficiency (%), and lifetime (years) across instances.
• Adapter tabs — copy-ready Calliope YAML or PyPSA dict for the selected instance.
• Share button — copies a /technologies/{id} deep-link using useOptimistic for instant feedback.

Time-series viewer (TimeSeriesCatalogue + ProfileViewer)

Browse and visualise the hourly profile catalogue:

• List of all profiles: type, resolution, country, carrier, year, number of timesteps.
• Filter by profile type or location.
• Click a profile to open ProfileViewer — an ECharts line chart of the 8 760-step series.
• UploadProfile — contributor form: upload CSV or JSON with a location picker (MapPickerModal using Leaflet).

World map view (WorldMapView + TechGeoMap + CountryPanel)

Geographic overview of technology instances:

• WorldMapView.tsx — zoom-able Leaflet map displaying pins per country where data originates from.
• TechGeoMap.tsx — clusters technology instances by country; click opens CountryPanel.
• CountryPanel.tsx — side panel listing all technologies with instances in a selected country, with links to full detail modals.

Contributor workspace (ContributorWorkspace)

Authenticated researchers can:

1. Submit a new technology record via AddTechnology — multi-step form built with InstanceSubForm and visual-builder/.
2. Upload a new time-series profile via UploadProfile.
3. Pick a geographic location via MapPickerModal (Leaflet map).

Submissions enter admin review queue before becoming public.

Admin panel (AdminPanel + ScraperPanel)

Guarded by isAdmin flag in AuthContext. Two sub-panels:

• AdminPanel.tsx — review pending technology and time-series submissions (approve / reject with notes).
• ScraperPanel.tsx — display current scraper pipeline status, trigger manual runs, browse scraped candidates, and approve/reject individual parameter extractions for merging into the catalogue.

Authentication (AuthPage + OAuthCallback)

Three login methods:

1. ORCID OAuth — redirects to orcid.org; callback stores JWT in sessionStorage.
2. Supabase email / password — standard credential login.
3. GitHub OAuth via Supabase — one-click social login.

AuthContext.tsx provides the global user, token, and isAdmin state across the entire SPA.

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State management

Mechanism	Used for
AuthContext (React Context)	JWT, user identity, isAdmin flag
Zustand store	Active category, search query, UI state (modal open/closed)
React 19 use() + Promise cache	Async data fetching with Suspense (no loading spinners)
useDeferredValue	Non-blocking search input — keeps grid visible while typing
startTransition	Smooth category switches without blocking the UI
useOptimistic	Instant share-button feedback before async completes

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API client (services/api.ts)

The API client is a thin wrapper that:

1. Memoises in-flight Promise objects — identical calls within the same render cycle return the same Promise, preventing duplicate requests.
2. Exposes Promises directly — designed for React 19 use() inside <Suspense>, eliminating the need for useEffect/useState data-fetching boilerplate.
3. Provides manual cache invalidation — call invalidateCategory() or invalidateAll() after a data mutation.

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Environment variables

Create frontend/.env.local:

VITE_API_BASE_URL=http://localhost:8000
VITE_SUPABASE_URL=https://<your-project>.supabase.co
VITE_SUPABASE_ANON_KEY=<your-anon-key>

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Production build

cd frontend
npm run build    # TypeScript check + Vite bundle → frontend/dist/
npm run preview  # Serve dist/ locally for smoke-testing

Serve frontend/dist/ with any static file server (nginx, Caddy, Vercel, GitHub Pages, Render static site, etc.).

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Tech stack

Library	Version	Role
React	19	UI framework — Server Components pattern, use(), startTransition
Vite	8	Build tool and dev server (hot-module replacement)
TypeScript	5.9	Type safety across all components and services
TailwindCSS	3.4	Utility-first styling (Material Design 3 colour tokens)
ECharts	6.x	Bar charts (CAPEX, efficiency) and line charts (time-series)
Leaflet	1.9	Interactive world map and location picker
Zustand	5.x	Minimal global state management
Supabase JS	2.x	Auth sessions (email, GitHub, ORCID via JWT)

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