Migrate WorldMap to d3-geo, fix TopoJSON country ID mappings and update tests

Docs/Tasks.md

@@ -8,79 +8,128 @@ Reference: `Docs/Refactoring.md` for full analysis of each issue.
 
 ## Open Issues
 
-### ~~WorldMap hover highlight: fill color sometimes does not change~~ ✅ Done
+### Replace `react-simple-maps` with `d3-geo` in WorldMap
 
-**Status:** Completed.
+The current `WorldMap` component (`frontend/src/components/WorldMap.tsx`) uses the `react-simple-maps` library (`ComposableMap`, `ZoomableGroup`, `Geography`, `useGeographies`). This library wraps d3-geo but adds a heavy abstraction layer and fetches the TopoJSON geography file from a remote CDN at runtime. Replace it with direct d3-geo rendering, following the pattern demonstrated in the reference project at `/media/lukas/Volume/repo/worldmaptest/`.
 
-**Summary:** Memoized Geography style objects via `useMemo` keyed by `geographies`, `countries`, `selectedCountry`, and threshold props. Stabilized `onMouseEnter`, `onMouseMove`, and `onMouseLeave` handlers with `useCallback` using `data-*` attributes to avoid per-Geography closures. This ensures `React.memo(Geography)` correctly skips re-renders when only tooltip position changes, eliminating the state-update race that caused hover fills to flash back to defaults.
+Reference: `Docs/Features.md` §4 (World Map View) for the full feature specification.
 
-**Symptom:** On mouse-over, a country's stroke correctly becomes bold (`strokeWidth: 1`), but the background fill colour sometimes stays at the default value instead of switching to the hover colour.
+**All existing features must be preserved.** The component's public API (`WorldMapProps`) and behaviour must remain identical so that `MapPage.tsx`, `HistoryPage.tsx`, and the existing unit test continue to work after the migration.
 
-**Root cause — `React.memo` is defeated by new style objects on every render:**
+---
 
-`Geography.js` (`react-simple-maps-main/src/components/Geography.js`) is wrapped in `memo()`. It keeps an internal `isFocused` state that toggles between `style.default` and `style.hover`. This works correctly in isolation.
+#### Task 1 — Swap npm dependencies [DONE]
 
-However, in `WorldMap.tsx` (`frontend/src/components/WorldMap.tsx`):
+Remove `react-simple-maps` and `@types/react-simple-maps` from `frontend/package.json`. Add the following packages that the new implementation requires:
 
-1. **`onMouseMove`** calls `setTooltip(...)` on every pixel of mouse movement, triggering a GeoLayer re-render.
+- `d3-geo` — geographic projection and SVG path generation.
-2. Each GeoLayer render creates a **new `style` object literal** for every `<Geography>` (lines ~199–222). Because `memo()` does a shallow reference comparison, it sees a "new" `style` prop every time and **re-renders all ~200 Geography components** on every mouse-move event.
+- `@types/d3-geo` — TypeScript definitions for d3-geo.
-3. During these rapid cascading re-renders, React's batched state updates can cause `Geography`'s internal `setFocus(true)` (fired in `handleMouseEnter`) and the parent's `setTooltip` to race. When the parent re-render is processed before `isFocused` is committed, Geography momentarily renders with `isFocused = false` and picks `style.default` — the fill stays at the default colour while the stroke (which changes less dramatically) appears correct.
+- `topojson-client` — converts TopoJSON to GeoJSON `FeatureCollection`.
+- `@types/topojson-client` — TypeScript definitions for topojson-client.
+- `world-atlas` — provides the `countries-110m.json` TopoJSON file as a local npm asset (no more CDN fetch at runtime).
 
-A secondary contributing factor: for countries with `count === 0` that are not selected, `style.hover.fill` equals `style.default.fill` (both resolve to `fillColor`), so there is intentionally no visible fill change on hover for those countries. This may overlap with the perceived bug if the user expects all countries to highlight.
+Run `npm install` and verify the lock file updates cleanly.
 
-**Fix — memoize the style objects so `memo()` can skip re-renders:**
+---
 
-In `WorldMap.tsx`, compute each Geography's style object with `useMemo` (or move it outside the `.map()` callback with stable references). Concretely:
+#### Task 2 — Rewrite `WorldMap.tsx` to use d3-geo directly [DONE]
 
-1. **Create a `useMemo`-based style map** keyed by `geo.rsmKey` that only recomputes when `countries`, `selectedCountry`, or the threshold props change — not on every tooltip update.
+Rewrite the component so that it renders a plain `<svg>` with `<path>` elements generated by d3-geo instead of the react-simple-maps wrappers. The implementation should follow this approach (as seen in the reference project):
 
-   ```tsx
+1. **Import the TopoJSON locally** — `import worldData from "world-atlas/countries-110m.json"` instead of fetching from a CDN URL. Use `topojson-client`'s `feature()` to extract the GeoJSON `FeatureCollection` once (memoised).
-   const styleMap = useMemo(() => {
-     const map: Record<string, { default: CSSProperties; hover: CSSProperties; pressed: CSSProperties }> = {};
-     for (const geo of geographies as { rsmKey: string; id: string | number }[]) {
-       const numericId = String(geo.id);
-       const cc = ISO_NUMERIC_TO_ALPHA2[numericId] ?? null;
-       const count = cc !== null ? (countries[cc] ?? 0) : 0;
-       const isSelected = cc !== null && selectedCountry === cc;
-       const fillColor = getBanCountColor(count, thresholdLow, thresholdMedium, thresholdHigh);
-       map[geo.rsmKey] = {
-         default: {
-           fill: isSelected ? tokens.colorBrandBackground : fillColor,
-           stroke: tokens.colorNeutralStroke2,
-           strokeWidth: 0.75,
-           outline: "none",
-         },
-         hover: {
-           fill: isSelected
-             ? tokens.colorBrandBackgroundHover
-             : cc && count > 0
-               ? tokens.colorNeutralBackground3
-               : fillColor,
-           stroke: tokens.colorNeutralStroke1,
-           strokeWidth: 1,
-           outline: "none",
-         },
-         pressed: {
-           fill: cc ? tokens.colorBrandBackgroundPressed : fillColor,
-           stroke: tokens.colorBrandStroke1,
-           strokeWidth: 1,
-           outline: "none",
-         },
-       };
-     }
-     return map;
-   }, [geographies, countries, selectedCountry, thresholdLow, thresholdMedium, thresholdHigh]);
-   ```
 
-2. **Pass the memoized style** in the `.map()` callback:
+2. **Create a projection** — Use `geoMercator()` from d3-geo (matching the current Mercator projection) with `.fitSize([width, height], featureCollection)` to auto-scale. Memoise the projection so it is only recomputed when the geometry changes.
-   ```tsx
-   <Geography style={styleMap[geo.rsmKey]} ... />
-   ```
 
-3. **Wrap event handlers in `useCallback`** (`onMouseEnter`, `onMouseMove`, `onMouseLeave`) or move them outside the `.map()` so they are stable references and do not defeat `memo()`. Consider passing `cc`, `count`, and `countryNames` as data attributes and reading them from `e.currentTarget` inside a single shared handler.
+3. **Create a path generator** — `geoPath().projection(projection)`. Memoise.
 
-With stable `style` references, `memo(Geography)` will correctly skip re-renders for countries whose data has not changed, eliminating the state-update race condition and the unnecessary rendering of ~200 SVG paths on every mouse-move event.
+4. **Render countries** — Map over the GeoJSON features and render a `<path>` element for each country. Use the `ISO_NUMERIC_TO_ALPHA2` lookup (already exists in `frontend/src/data/isoNumericToAlpha2.ts`) to translate the numeric feature id to the alpha-2 code expected by the `countries` prop.
 
-**Files to change:**
+5. **Preserve colour coding** — Continue using `getBanCountColor()` from `frontend/src/utils/mapColors.ts` to compute each country's fill colour based on its ban count and the three threshold props.
-- `frontend/src/components/WorldMap.tsx` — memoize style objects and stabilize event handlers.
+
-- No changes needed in `react-simple-maps-main/src/components/Geography.js`.
+6. **Preserve ban-count labels** — For every country with `count > 0`, compute the centroid with `pathGenerator.centroid(feature)` and render a `<text>` element at that position showing the count. Countries with zero bans must remain blank and transparent (no fill, no label).
+
+7. **Preserve country selection** — Clicking a country calls `onSelectCountry` with the alpha-2 code (or `null` to deselect). The selected country must receive a distinct brand fill colour, matching the current behaviour.
+
+8. **Preserve hover tooltip** — On `mouseenter` / `mousemove` / `mouseleave`, show/hide a tooltip portal (`createPortal` into `document.body`) displaying the country name and ban count. Use the same Fluent UI styled tooltip div that the current implementation uses.
+
+9. **Preserve keyboard accessibility** — Each country with a known alpha-2 code must have `role="button"`, `tabIndex={0}`, an `aria-label` (`"CC: N ban(s)"`), and `aria-pressed` when selected. `Enter` and `Space` must trigger selection/deselection.
+
+10. **Use a `viewBox`-based responsive SVG** — Set `viewBox="0 0 {width} {height}"` and `style={{ width: "100%", height: "auto" }}` so the map scales with its container, matching the reference project's approach.
+
+---
+
+#### Task 3 — Implement zoom and pan without `react-simple-maps` [DONE]
+
+The current implementation relies on `ZoomableGroup` from react-simple-maps for zoom/pan. Reimplement this using a `<g>` wrapper with an SVG `transform` attribute driven by React state:
+
+1. **State:** Track `zoom` (number, 1–8) and `center` (translate offset `[x, y]`).
+
+2. **Zoom controls:** Keep the three overlay buttons (Zoom In `+`, Zoom Out `−`, Reset `⟲`) in the top-right corner. Each button adjusts the `zoom` state by ±0.5, clamped to `[1, 8]`. Reset sets zoom to 1 and center to `[0, 0]`.
+
+3. **Mouse-wheel zoom:** Attach a `wheel` event handler to the SVG that increments/decrements zoom on scroll, zooming toward the cursor position.
+
+4. **Click-and-drag pan:** Track `mousedown` → `mousemove` → `mouseup` on the SVG to translate the `center` offset. Only pan when the drag exceeds a small threshold (e.g. 3 px) to avoid conflicting with country click events.
+
+5. **Touch support (stretch goal):** Optionally support pinch-to-zoom and touch-drag for tablet users.
+
+6. **Apply transform:** Wrap all `<path>` and `<text>` elements in a `<g transform="translate(tx, ty) scale(zoom)">` group. Alternatively, use `d3-zoom` if a more robust implementation is preferred, but keep React as the rendering layer (no d3 DOM manipulation).
+
+---
+
+#### Task 4 — Update hover and selection styles to use CSS transitions [DONE]
+
+The reference project applies hover highlights via CSS classes (`.country`, `.country.hovered`) with CSS `transition` instead of the react-simple-maps `style={{ default, hover, pressed }}` object. Adopt the same approach:
+
+- Define CSS classes (or Fluent UI `makeStyles` rules) for default, hovered, and selected states.
+- Apply the correct class based on component state (`isSelected`, `isHovered`).
+- Use a CSS `transition` on `fill` and `stroke` for a smooth 150 ms highlight effect.
+- This avoids the react-simple-maps per-geography style object entirely.
+
+Ensure the selected state still uses `tokens.colorBrandBackground` / `tokens.colorBrandBackgroundHover` / `tokens.colorBrandBackgroundPressed` from Fluent UI so the map integrates visually with the rest of the application.
+
+---
+
+#### Task 5 — Update the WorldMap unit test [DONE]
+
+The existing test at `frontend/src/components/__tests__/WorldMap.test.tsx` mocks `react-simple-maps`. After the migration those mocks are invalid. Update the test:
+
+1. **Remove the `vi.mock("react-simple-maps", ...)` block.**
+
+2. **Mock the TopoJSON data instead.** Since the new implementation imports `world-atlas/countries-110m.json` directly, mock that module to return a minimal TopoJSON object containing a single country feature (e.g. id `"840"` for the US). Use `topojson-client`'s `feature()` to verify the mock produces a valid GeoJSON feature.
+
+3. **Keep the same assertions:** tooltip appears on hover with country name and ban count, tooltip disappears on mouse leave, country element has correct ARIA attributes (`role="button"`, `aria-label`, `aria-pressed`).
+
+4. **Verify zoom controls render:** assert that the three zoom buttons (Zoom In, Zoom Out, Reset) are present and have the correct `aria-label` values.
+
+5. Also verify that tests in `MapPage.test.tsx` and `HistoryPage.test.tsx` still pass (they mock `WorldMap` at the component level so they should be unaffected, but confirm).
+
+---
+
+#### Task 6 — Remove CDN dependency and verify offline capability [DONE]
+
+The old implementation fetched geography data from `https://cdn.jsdelivr.net/npm/world-atlas@2/countries-110m.json` at runtime. The new implementation bundles the data via the `world-atlas` npm package, so:
+
+1. Delete the `GEO_URL` constant.
+2. Confirm the TopoJSON file is included in the Vite bundle (imported as a JSON module).
+3. Verify the map renders correctly without any network request for geography data (check the browser network tab or write a test that asserts no fetch calls are made for the old CDN URL).
+
+---
+
+#### Task 7 — Final integration smoke test [DONE]
+
+After all changes, manually verify the following against the feature specification in `Docs/Features.md` §4:
+
+- Countries are colour-coded by ban count (transparent → green → yellow → red) using smooth interpolation.
+- Ban count numbers are displayed centred inside each country that has bans.
+- Countries with zero bans are transparent with no label.
+- Clicking a country filters the companion ban table below.
+- Clicking the same country again deselects it.
+- Zoom in / zoom out / reset buttons work correctly (range 1×–8×).
+- Mouse-wheel zoom and click-drag pan work.
+- Tooltip appears on hover showing country name and localised ban count.
+- Keyboard navigation works (Tab to focus, Enter/Space to toggle selection).
+- The map is responsive and scales with the container width.
+- Time-range selector on `MapPage` still updates the map data correctly.
+- Colour thresholds from settings are applied (thresholdLow, thresholdMedium, thresholdHigh props).
+- Run `npm run test` — all existing tests pass.
+- Run `npm run build` — production build succeeds with no errors or warnings.

frontend/package-lock.json

@@ -1,30 +1,33 @@
 {
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+  "version": "0.9.15",
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   "requires": true,
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     "": {
       "name": "bangui-frontend",
-      "version": "0.9.14",
+      "version": "0.9.15",
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+        "d3-geo": "^3.1.1",
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         "react-router-dom": "^6.27.0",
-        "react-simple-maps": "^3.0.0",
+        "recharts": "^3.8.0",
-        "recharts": "^3.8.0"
+        "topojson-client": "^3.1.0",
+        "world-atlas": "^2.0.2"
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+        "@types/d3-geo": "^3.1.0",
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@@ -3565,23 +3568,15 @@
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@@ -3696,16 +3676,25 @@
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-        "@types/d3-zoom": "^2",
         "@types/geojson": "*",
-        "@types/react": "*"
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@@ -4508,12 +4475,15 @@
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@@ -4550,12 +4520,6 @@
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     "node_modules/d3-shape": {
       "version": "3.2.0",
       "resolved": "https://registry.npmjs.org/d3-shape/-/d3-shape-3.2.0.tgz",
@@ -4592,41 +4556,6 @@
         "node": ">=12"
       }
     },
-    "node_modules/d3-timer": {
-      "version": "2.0.0",
-      "resolved": "https://registry.npmjs.org/d3-timer/-/d3-timer-2.0.0.tgz",
-      "integrity": "sha512-TO4VLh0/420Y/9dO3+f9abDEFYeCUr2WZRlxJvbp4HPTQcSylXNiL6yZa9FIUvV1yRiFufl1bszTCLDqv9PWNA==",
-      "license": "BSD-3-Clause"
-    },
-    "node_modules/d3-transition": {
-      "version": "2.0.0",
-      "resolved": "https://registry.npmjs.org/d3-transition/-/d3-transition-2.0.0.tgz",
-      "integrity": "sha512-42ltAGgJesfQE3u9LuuBHNbGrI/AJjNL2OAUdclE70UE6Vy239GCBEYD38uBPoLeNsOhFStGpPI0BAOV+HMxog==",
-      "license": "BSD-3-Clause",
-      "dependencies": {
-        "d3-color": "1 - 2",
-        "d3-dispatch": "1 - 2",
-        "d3-ease": "1 - 2",
-        "d3-interpolate": "1 - 2",
-        "d3-timer": "1 - 2"
-      },
-      "peerDependencies": {
-        "d3-selection": "2"
-      }
-    },
-    "node_modules/d3-zoom": {
-      "version": "2.0.0",
-      "resolved": "https://registry.npmjs.org/d3-zoom/-/d3-zoom-2.0.0.tgz",
-      "integrity": "sha512-fFg7aoaEm9/jf+qfstak0IYpnesZLiMX6GZvXtUSdv8RH2o4E2qeelgdU09eKS6wGuiGMfcnMI0nTIqWzRHGpw==",
-      "license": "BSD-3-Clause",
-      "dependencies": {
-        "d3-dispatch": "1 - 2",
-        "d3-drag": "2",
-        "d3-interpolate": "1 - 2",
-        "d3-selection": "2",
-        "d3-transition": "2"
-      }
-    },
     "node_modules/data-urls": {
       "version": "7.0.0",
       "resolved": "https://registry.npmjs.org/data-urls/-/data-urls-7.0.0.tgz",
@@ -5745,16 +5674,6 @@
       "dev": true,
       "license": "MIT"
     },
-    "node_modules/object-assign": {
-      "version": "4.1.1",
-      "resolved": "https://registry.npmjs.org/object-assign/-/object-assign-4.1.1.tgz",
-      "integrity": "sha512-rJgTQnkUnH1sFw8yT6VSU3zD3sWmu6sZhIseY8VX+GRu3P6F7Fu+JNDoXfklElbLJSnc3FUQHVe4cU5hj+BcUg==",
-      "license": "MIT",
-      "peer": true,
-      "engines": {
-        "node": ">=0.10.0"
-      }
-    },
     "node_modules/obug": {
       "version": "2.1.1",
       "resolved": "https://registry.npmjs.org/obug/-/obug-2.1.1.tgz",
@@ -5982,18 +5901,6 @@
       "license": "MIT",
       "peer": true
     },
-    "node_modules/prop-types": {
-      "version": "15.8.1",
-      "resolved": "https://registry.npmjs.org/prop-types/-/prop-types-15.8.1.tgz",
-      "integrity": "sha512-oj87CgZICdulUohogVAR7AjlC0327U4el4L6eAvOqCeudMDVU0NThNaV+b9Df4dXgSP1gXMTnPdhfe/2qDH5cg==",
-      "license": "MIT",
-      "peer": true,
-      "dependencies": {
-        "loose-envify": "^1.4.0",
-        "object-assign": "^4.1.1",
-        "react-is": "^16.13.1"
-      }
-    },
     "node_modules/punycode": {
       "version": "2.3.1",
       "resolved": "https://registry.npmjs.org/punycode/-/punycode-2.3.1.tgz",
@@ -6110,23 +6017,6 @@
         "react-dom": ">=16.8"
       }
     },
-    "node_modules/react-simple-maps": {
-      "version": "3.0.0",
-      "resolved": "https://registry.npmjs.org/react-simple-maps/-/react-simple-maps-3.0.0.tgz",
-      "integrity": "sha512-vKNFrvpPG8Vyfdjnz5Ne1N56rZlDfHXv5THNXOVZMqbX1rWZA48zQuYT03mx6PAKanqarJu/PDLgshIZAfHHqw==",
-      "license": "MIT",
-      "dependencies": {
-        "d3-geo": "^2.0.2",
-        "d3-selection": "^2.0.0",
-        "d3-zoom": "^2.0.0",
-        "topojson-client": "^3.1.0"
-      },
-      "peerDependencies": {
-        "prop-types": "^15.7.2",
-        "react": "^16.8.0 || 17.x || 18.x",
-        "react-dom": "^16.8.0 || 17.x || 18.x"
-      }
-    },
     "node_modules/recharts": {
       "version": "3.8.0",
       "resolved": "https://registry.npmjs.org/recharts/-/recharts-3.8.0.tgz",
@@ -7516,6 +7406,12 @@
         "node": ">=0.10.0"
       }
     },
+    "node_modules/world-atlas": {
+      "version": "2.0.2",
+      "resolved": "https://registry.npmjs.org/world-atlas/-/world-atlas-2.0.2.tgz",
+      "integrity": "sha512-IXfV0qwlKXpckz1FhwXVwKRjiIhOnWttOskm5CtxMsjgE/MXAYRHWJqgXOpM8IkcPBoXnyTU5lFHcYa5ChG0LQ==",
+      "license": "ISC"
+    },
     "node_modules/xml-name-validator": {
       "version": "5.0.0",
       "resolved": "https://registry.npmjs.org/xml-name-validator/-/xml-name-validator-5.0.0.tgz",

frontend/package.json

@@ -17,14 +17,17 @@
   "dependencies": {
     "@fluentui/react-components": "^9.55.0",
     "@fluentui/react-icons": "^2.0.257",
-    "@types/react-simple-maps": "^3.0.6",
+    "d3-geo": "^3.1.1",
     "react": "^18.3.1",
     "react-dom": "^18.3.1",
     "react-router-dom": "^6.27.0",
-    "react-simple-maps": "^3.0.0",
+    "topojson-client": "^3.1.0",
+    "world-atlas": "^2.0.2",
     "recharts": "^3.8.0"
   },
   "devDependencies": {
+    "@types/d3-geo": "^3.1.0",
+    "@types/topojson-client": "^3.0.0",
     "@eslint/js": "^9.13.0",
     "@testing-library/jest-dom": "^6.9.1",
     "@testing-library/react": "^16.3.2",

frontend/src/components/WorldMap.tsx

@@ -1,32 +1,42 @@
 /**
  * WorldMap — SVG world map showing per-country ban counts.
  *
- * Uses react-simple-maps with the Natural Earth 110m TopoJSON data from
+ * Uses a local TopoJSON bundle and d3-geo for projection, path generation,
- * jsDelivr CDN.  For each country that has bans in the selected time window,
+ * and native SVG pan/zoom behaviour.
- * the total count is displayed inside the country's borders.  Clicking a
- * country filters the companion table.
  */
 
 import { createPortal } from "react-dom";
-import { useCallback, useMemo, useState } from "react";
+import {
-import { ComposableMap, ZoomableGroup, Geography, useGeographies } from "react-simple-maps";
+  useCallback,
+  useEffect,
+  useMemo,
+  useRef,
+  useState,
+} from "react";
 import { Button, makeStyles, tokens } from "@fluentui/react-components";
+import { geoMercator, geoPath, type GeoPath } from "d3-geo";
+import { feature } from "topojson-client";
+import type {
+  Feature,
+  FeatureCollection,
+  GeoJsonProperties,
+  Geometry,
+} from "geojson";
+import type {
+  GeometryCollection as TopoGeometryCollection,
+  Topology,
+} from "topojson-specification";
+import worldData from "world-atlas/countries-110m.json";
 import { useCardStyles } from "../theme/commonStyles";
-import type { CSSProperties } from "react";
-import type { GeoPermissibleObjects } from "d3-geo";
 import { ISO_NUMERIC_TO_ALPHA2 } from "../data/isoNumericToAlpha2";
 import { getBanCountColor } from "../utils/mapColors";
 
-// ---------------------------------------------------------------------------
+const MAP_WIDTH = 800;
-// Static data URL — world-atlas 110m TopoJSON (No-fill, outline-only)
+const MAP_HEIGHT = 400;
-// ---------------------------------------------------------------------------
+const MIN_ZOOM = 1;
-
+const MAX_ZOOM = 8;
-const GEO_URL =
+const ZOOM_STEP = 0.5;
-  "https://cdn.jsdelivr.net/npm/world-atlas@2/countries-110m.json";
+const PAN_THRESHOLD = 3;
-
-// ---------------------------------------------------------------------------
-// Styles
-// ---------------------------------------------------------------------------
 
 const useStyles = makeStyles({
   mapWrapper: {
@@ -34,6 +44,25 @@ const useStyles = makeStyles({
     position: "relative",
     overflow: "hidden",
   },
+  svg: {
+    width: "100%",
+    height: "auto",
+    touchAction: "none",
+  },
+  country: {
+    transition: "fill 150ms ease, stroke 150ms ease",
+    stroke: tokens.colorNeutralStroke2,
+    strokeWidth: 0.75,
+    fill: "var(--country-fill)",
+    outline: "none",
+    cursor: "pointer",
+  },
+  countryHovered: {
+    fill: "var(--country-hover-fill)",
+  },
+  countrySelected: {
+    fill: "var(--country-selected-fill)",
+  },
   countLabel: {
     fontSize: "9px",
     fontWeight: "600",
@@ -74,212 +103,21 @@ const useStyles = makeStyles({
   },
 });
 
-// ---------------------------------------------------------------------------
+type TopoJsonTopology = Topology & {
-// GeoLayer — must be rendered inside ComposableMap to access map context
+  objects: {
-// ---------------------------------------------------------------------------
+    countries: TopoGeometryCollection;
+  };
+};
 
-interface GeoLayerProps {
+type TooltipState = {
-  countries: Record<string, number>;
-  countryNames?: Record<string, string>;
-  selectedCountry: string | null;
-  onSelectCountry: (cc: string | null) => void;
-  thresholdLow: number;
-  thresholdMedium: number;
-  thresholdHigh: number;
-}
-
-function GeoLayer({
-  countries,
-  countryNames,
-  selectedCountry,
-  onSelectCountry,
-  thresholdLow,
-  thresholdMedium,
-  thresholdHigh,
-}: GeoLayerProps): React.JSX.Element {
-  const styles = useStyles();
-  const { geographies, path } = useGeographies({ geography: GEO_URL });
-
-  const [tooltip, setTooltip] = useState<
-    | {
   cc: string;
   count: number;
   name: string;
   x: number;
   y: number;
-      }
+} | null;
-    | null
-  >(null);
 
-  const handleClick = useCallback(
+interface WorldMapProps {
-    (cc: string | null): void => {
-      onSelectCountry(selectedCountry === cc ? null : cc);
-    },
-    [selectedCountry, onSelectCountry],
-  );
-
-  // Stable event handlers — shared across all Geography components so
-  // React.memo is not defeated by new function references each render.
-  const handleMouseEnter = useCallback(
-    (e: React.MouseEvent<SVGPathElement>): void => {
-      const cc = e.currentTarget.dataset.cc;
-      if (!cc) return;
-      const count = Number(e.currentTarget.dataset.count);
-      const name = e.currentTarget.dataset.name ?? cc;
-      setTooltip({ cc, count, name, x: e.clientX, y: e.clientY });
-    },
-    [],
-  );
-
-  const handleMouseMove = useCallback(
-    (e: React.MouseEvent<SVGPathElement>): void => {
-      setTooltip((current) =>
-        current
-          ? { ...current, x: e.clientX, y: e.clientY }
-          : current,
-      );
-    },
-    [],
-  );
-
-  const handleMouseLeave = useCallback((): void => {
-    setTooltip(null);
-  }, []);
-
-  // Memoize style objects so Geography's React.memo can skip re-renders
-  // when only the tooltip position changes.
-  type GeoStyle = { default: CSSProperties; hover: CSSProperties; pressed: CSSProperties };
-  const styleMap = useMemo(() => {
-    const map: Record<string, GeoStyle> = {};
-    for (const geo of geographies as { rsmKey: string; id: string | number }[]) {
-      const numericId = String(geo.id);
-      const cc: string | null = ISO_NUMERIC_TO_ALPHA2[numericId] ?? null;
-      const count: number = cc !== null ? (countries[cc] ?? 0) : 0;
-      const isSelected = cc !== null && selectedCountry === cc;
-      const fillColor = getBanCountColor(count, thresholdLow, thresholdMedium, thresholdHigh);
-      map[geo.rsmKey] = {
-        default: {
-          fill: isSelected ? tokens.colorBrandBackground : fillColor,
-          stroke: tokens.colorNeutralStroke2,
-          strokeWidth: 0.75,
-          outline: "none",
-        },
-        hover: {
-          fill: isSelected
-            ? tokens.colorBrandBackgroundHover
-            : cc && count > 0
-              ? tokens.colorNeutralBackground3
-              : fillColor,
-          stroke: tokens.colorNeutralStroke1,
-          strokeWidth: 1,
-          outline: "none",
-        },
-        pressed: {
-          fill: cc ? tokens.colorBrandBackgroundPressed : fillColor,
-          stroke: tokens.colorBrandStroke1,
-          strokeWidth: 1,
-          outline: "none",
-        },
-      };
-    }
-    return map;
-  }, [geographies, countries, selectedCountry, thresholdLow, thresholdMedium, thresholdHigh]);
-
-  if (geographies.length === 0) return <></>;
-
-  // react-simple-maps types declare path as always defined, but it can be null
-  // during initial render before MapProvider context initializes. Cast to reflect
-  // the true runtime type and allow safe null checking.
-  const safePath = path as unknown as typeof path | null;
-
-  return (
-    <>
-      {(geographies as { rsmKey: string; id: string | number }[]).map(
-        (geo) => {
-          const numericId = String(geo.id);
-          const cc: string | null = ISO_NUMERIC_TO_ALPHA2[numericId] ?? null;
-          const count: number = cc !== null ? (countries[cc] ?? 0) : 0;
-          const isSelected = cc !== null && selectedCountry === cc;
-
-          // Only calculate centroid if path is available
-          let cx: number | undefined;
-          let cy: number | undefined;
-          if (safePath != null) {
-            const centroid = safePath.centroid(geo as unknown as GeoPermissibleObjects);
-            [cx, cy] = centroid;
-          }
-
-          return (
-            <g key={geo.rsmKey} style={{ cursor: cc ? "pointer" : "default" }}>
-            <Geography
-              geography={geo}
-              role={cc ? "button" : undefined}
-              tabIndex={cc ? 0 : undefined}
-              aria-label={
-                cc
-                  ? `${cc}: ${String(count)} ban${count !== 1 ? "s" : ""}${
-                      isSelected ? " (selected)" : ""
-                    }`
-                  : undefined
-              }
-              aria-pressed={isSelected || undefined}
-              onClick={(): void => {
-                if (cc) handleClick(cc);
-              }}
-              onKeyDown={(e): void => {
-                if (cc && (e.key === "Enter" || e.key === " ")) {
-                  e.preventDefault();
-                  handleClick(cc);
-                }
-              }}
-              onMouseEnter={handleMouseEnter}
-              onMouseMove={handleMouseMove}
-              onMouseLeave={handleMouseLeave}
-              data-cc={cc ?? undefined}
-              data-count={cc ? String(count) : undefined}
-              data-name={cc ? (countryNames?.[cc] ?? cc) : undefined}
-              style={styleMap[geo.rsmKey]}
-            />
-            {count > 0 && cx !== undefined && cy !== undefined && isFinite(cx) && isFinite(cy) && (
-              <text
-                x={cx}
-                y={cy}
-                textAnchor="middle"
-                dominantBaseline="central"
-                className={styles.countLabel}
-              >
-                {count}
-              </text>
-            )}
-          </g>
-          );
-        },
-      )}
-
-      {tooltip &&
-        createPortal(
-          <div
-            className={styles.tooltip}
-            style={{ left: tooltip.x + 12, top: tooltip.y + 12 }}
-            role="tooltip"
-            aria-live="polite"
-          >
-            <span className={styles.tooltipCountry}>{tooltip.name}</span>
-            <span className={styles.tooltipCount}>
-              {tooltip.count.toLocaleString()} ban{tooltip.count !== 1 ? "s" : ""}
-            </span>
-          </div>,
-          document.body,
-        )}
-    </>
-  );
-}
-
-// ---------------------------------------------------------------------------
-// WorldMap — public component
-// ---------------------------------------------------------------------------
-
-export interface WorldMapProps {
   /** ISO alpha-2 country code → ban count. */
   countries: Record<string, number>;
   /** Optional mapping from country code to display name. */
@@ -307,21 +145,143 @@ export function WorldMap({
 }: WorldMapProps): React.JSX.Element {
   const styles = useStyles();
   const cardStyles = useCardStyles();
-  const [zoom, setZoom] = useState<number>(1);
+  const [zoom, setZoom] = useState<number>(MIN_ZOOM);
   const [center, setCenter] = useState<[number, number]>([0, 0]);
+  const [hoveredCountry, setHoveredCountry] = useState<string | null>(null);
+  const [tooltip, setTooltip] = useState<TooltipState>(null);
 
-  const handleZoomIn = (): void => {
+  const zoomRef = useRef<number>(zoom);
-    setZoom((z) => Math.min(z + 0.5, 8));
+  const centerRef = useRef<[number, number]>(center);
+  const dragStateRef = useRef<{
+    active: boolean;
+    startX: number;
+    startY: number;
+    startCenter: [number, number];
+    moved: boolean;
+  } | null>(null);
+  const clickSuppressedRef = useRef<boolean>(false);
+
+  useEffect(() => {
+    zoomRef.current = zoom;
+  }, [zoom]);
+
+  useEffect(() => {
+    centerRef.current = center;
+  }, [center]);
+
+  const topology = useMemo(() => worldData as unknown as TopoJsonTopology, []);
+
+  const geoJson = useMemo(
+    () =>
+      feature(topology, topology.objects.countries) as FeatureCollection<
+        Geometry,
+        GeoJsonProperties
+      >,
+    [topology],
+  );
+
+  const projection = useMemo(
+    () => geoMercator().fitSize([MAP_WIDTH, MAP_HEIGHT], geoJson),
+    [geoJson],
+  );
+
+  const pathGenerator = useMemo<GeoPath<unknown, Feature<Geometry, GeoJsonProperties>>>(
+    () => geoPath().projection(projection),
+    [projection],
+  );
+
+  const countryFeatures = useMemo(
+    () => geoJson.features.filter((feature) => feature.id != null && feature.geometry != null),
+    [geoJson.features],
+  );
+
+  const clampZoom = useCallback((value: number) => Math.min(Math.max(value, MIN_ZOOM), MAX_ZOOM), []);
+
+  const handleCountrySelect = useCallback(
+    (cc: string | null): void => {
+      if (clickSuppressedRef.current) {
+        return;
+      }
+
+      onSelectCountry(selectedCountry === cc ? null : cc);
+    },
+    [onSelectCountry, selectedCountry],
+  );
+
+  const handlePointerDown = useCallback((event: React.PointerEvent<SVGSVGElement>) => {
+    if (event.button !== 0) return;
+
+    event.currentTarget.setPointerCapture(event.pointerId);
+    dragStateRef.current = {
+      active: true,
+      startX: event.clientX,
+      startY: event.clientY,
+      startCenter: centerRef.current,
+      moved: false,
     };
+    clickSuppressedRef.current = false;
+  }, []);
 
-  const handleZoomOut = (): void => {
+  const handlePointerMove = useCallback((event: React.PointerEvent<SVGSVGElement>) => {
-    setZoom((z) => Math.max(z - 0.5, 1));
+    const drag = dragStateRef.current;
-  };
+    if (!drag?.active) return;
 
-  const handleResetView = (): void => {
+    const dx = event.clientX - drag.startX;
-    setZoom(1);
+    const dy = event.clientY - drag.startY;
+    if (!drag.moved && Math.hypot(dx, dy) > PAN_THRESHOLD) {
+      drag.moved = true;
+      clickSuppressedRef.current = true;
+    }
+
+    setCenter([drag.startCenter[0] + dx, drag.startCenter[1] + dy]);
+  }, []);
+
+  const handlePointerUp = useCallback((event: React.PointerEvent<SVGSVGElement>) => {
+    const drag = dragStateRef.current;
+    if (!drag) return;
+
+    if (event.currentTarget.hasPointerCapture(event.pointerId)) {
+      event.currentTarget.releasePointerCapture(event.pointerId);
+    }
+
+    dragStateRef.current = null;
+    window.setTimeout(() => {
+      clickSuppressedRef.current = false;
+    }, 0);
+  }, []);
+
+  const handleWheel = useCallback((event: React.WheelEvent<SVGSVGElement>) => {
+    event.preventDefault();
+
+    const currentZoom = zoomRef.current;
+    const desiredZoom = clampZoom(currentZoom + (event.deltaY < 0 ? ZOOM_STEP : -ZOOM_STEP));
+    if (desiredZoom === currentZoom) {
+      return;
+    }
+
+    const rect = event.currentTarget.getBoundingClientRect();
+    const svgX = (event.clientX - rect.left - centerRef.current[0]) / currentZoom;
+    const svgY = (event.clientY - rect.top - centerRef.current[1]) / currentZoom;
+
+    setZoom(desiredZoom);
+    setCenter([
+      centerRef.current[0] - svgX * (desiredZoom - currentZoom),
+      centerRef.current[1] - svgY * (desiredZoom - currentZoom),
+    ]);
+  }, [clampZoom]);
+
+  const handleZoomIn = useCallback(() => {
+    setZoom((value) => clampZoom(value + ZOOM_STEP));
+  }, [clampZoom]);
+
+  const handleZoomOut = useCallback(() => {
+    setZoom((value) => clampZoom(value - ZOOM_STEP));
+  }, [clampZoom]);
+
+  const handleResetView = useCallback(() => {
+    setZoom(MIN_ZOOM);
     setCenter([0, 0]);
-  };
+  }, []);
 
   return (
     <div
@@ -329,13 +289,12 @@ export function WorldMap({
       role="img"
       aria-label="World map showing banned IP counts by country. Click a country to filter the table below."
     >
-      {/* Zoom controls */}
       <div className={styles.zoomControls}>
         <Button
           appearance="secondary"
           size="small"
           onClick={handleZoomIn}
-          disabled={zoom >= 8}
+          disabled={zoom >= MAX_ZOOM}
           title="Zoom in"
           aria-label="Zoom in"
         >
@@ -345,7 +304,7 @@ export function WorldMap({
           appearance="secondary"
           size="small"
           onClick={handleZoomOut}
-          disabled={zoom <= 1}
+          disabled={zoom <= MIN_ZOOM}
           title="Zoom out"
           aria-label="Zoom out"
         >
@@ -355,7 +314,7 @@ export function WorldMap({
           appearance="secondary"
           size="small"
           onClick={handleResetView}
-          disabled={zoom === 1 && center[0] === 0 && center[1] === 0}
+          disabled={zoom === MIN_ZOOM && center[0] === 0 && center[1] === 0}
           title="Reset view"
           aria-label="Reset view"
         >
@@ -363,34 +322,126 @@ export function WorldMap({
         </Button>
       </div>
 
-      <ComposableMap
+      <svg
-        projection="geoMercator"
+        className={styles.svg}
-        projectionConfig={{ scale: 130, center: [10, 20] }}
+        viewBox={`0 0 ${MAP_WIDTH} ${MAP_HEIGHT}`}
-        width={800}
+        role="img"
-        height={400}
+        aria-label="World map showing banned IP counts by country."
-        style={{ width: "100%", height: "auto" }}
+        onPointerDown={handlePointerDown}
+        onPointerMove={handlePointerMove}
+        onPointerUp={handlePointerUp}
+        onPointerLeave={handlePointerUp}
+        onWheel={handleWheel}
       >
-        <ZoomableGroup
+        <g transform={`translate(${center[0]} ${center[1]}) scale(${zoom})`}>
-          zoom={zoom}
+          {countryFeatures.map((featureItem) => {
-          center={center}
+            const rawId = featureItem.id;
-          onMoveEnd={({ zoom: newZoom, coordinates }): void => {
+            const numericId = String(Number(rawId));
-            setZoom(newZoom);
+            const cc = ISO_NUMERIC_TO_ALPHA2[numericId] ?? null;
-            setCenter(coordinates);
+            const count = cc !== null ? countries[cc] ?? 0 : 0;
+            const isSelected = cc !== null && selectedCountry === cc;
+            const fillColor = getBanCountColor(count, thresholdLow, thresholdMedium, thresholdHigh);
+            const pathString = pathGenerator(featureItem) ?? "";
+            if (!pathString) {
+              return null;
+            }
+
+            const centroid = pathGenerator.centroid(featureItem);
+            const [cx, cy] = centroid;
+            const isCentroidValid = Number.isFinite(cx) && Number.isFinite(cy);
+
+            return (
+              <g key={String(rawId)}>
+                <path
+                  d={pathString}
+                  role={cc ? "button" : undefined}
+                  tabIndex={cc ? 0 : undefined}
+                  aria-label={
+                    cc
+                      ? `${cc}: ${String(count)} ban${count !== 1 ? "s" : ""}${
+                          isSelected ? " (selected)" : ""
+                        }`
+                      : undefined
+                  }
+                  aria-pressed={isSelected || undefined}
+                  className={`${styles.country} ${
+                    isSelected ? styles.countrySelected : ""
+                  } ${hoveredCountry === cc ? styles.countryHovered : ""}`}
+                  style={
+                    {
+                      ["--country-fill" as string]: fillColor,
+                      ["--country-hover-fill" as string]: isSelected
+                        ? tokens.colorBrandBackgroundHover
+                        : tokens.colorBrandBackground2,
+                      ["--country-selected-fill" as string]: tokens.colorBrandBackground,
+                    } as React.CSSProperties
+                  }
+                  onClick={(): void => {
+                    if (cc) {
+                      handleCountrySelect(cc);
+                    }
+                  }}
+                  onKeyDown={(event): void => {
+                    if (cc && (event.key === "Enter" || event.key === " ")) {
+                      event.preventDefault();
+                      handleCountrySelect(cc);
+                    }
+                  }}
+                  onMouseEnter={(event): void => {
+                    if (!cc) return;
+                    setHoveredCountry(cc);
+                    setTooltip({
+                      cc,
+                      count,
+                      name: countryNames?.[cc] ?? cc,
+                      x: event.clientX,
+                      y: event.clientY,
+                    });
+                  }}
+                  onMouseMove={(event): void => {
+                    setTooltip((current) =>
+                      current
+                        ? { ...current, x: event.clientX, y: event.clientY }
+                        : current,
+                    );
+                  }}
+                  onMouseLeave={(): void => {
+                    setHoveredCountry(null);
+                    setTooltip(null);
                   }}
-          minZoom={1}
-          maxZoom={8}
-        >
-          <GeoLayer
-            countries={countries}
-            countryNames={countryNames}
-            selectedCountry={selectedCountry}
-            onSelectCountry={onSelectCountry}
-            thresholdLow={thresholdLow}
-            thresholdMedium={thresholdMedium}
-            thresholdHigh={thresholdHigh}
                 />
-        </ZoomableGroup>
+                {count > 0 && isCentroidValid && (
-      </ComposableMap>
+                  <text
+                    x={cx}
+                    y={cy}
+                    textAnchor="middle"
+                    dominantBaseline="central"
+                    className={styles.countLabel}
+                  >
+                    {count}
+                  </text>
+                )}
+              </g>
+            );
+          })}
+        </g>
+      </svg>
+
+      {tooltip &&
+        createPortal(
+          <div
+            className={styles.tooltip}
+            style={{ left: tooltip.x + 12, top: tooltip.y + 12 }}
+            role="tooltip"
+            aria-live="polite"
+          >
+            <span className={styles.tooltipCountry}>{tooltip.name}</span>
+            <span className={styles.tooltipCount}>
+              {tooltip.count.toLocaleString()} ban{tooltip.count !== 1 ? "s" : ""}
+            </span>
+          </div>,
+          document.body,
+        )}
     </div>
   );
 }

frontend/src/components/__tests__/WorldMap.test.tsx

@@ -8,16 +8,31 @@ import { describe, expect, it, vi } from "vitest";
 import { fireEvent, render, screen } from "@testing-library/react";
 import { FluentProvider, webLightTheme } from "@fluentui/react-components";
 
-// Mock react-simple-maps to avoid fetching real TopoJSON and to control geometry.
+vi.mock(
-vi.mock("react-simple-maps", () => ({
+  "world-atlas/countries-110m.json",
-  ComposableMap: ({ children }: { children: React.ReactNode }) => <div>{children}</div>,
+  () => ({
-  ZoomableGroup: ({ children }: { children: React.ReactNode }) => <div>{children}</div>,
+    default: {
-  Geography: ({ children, ...props }: { children?: React.ReactNode } & Record<string, unknown>) => <g {...props}>{children}</g>,
+      type: "Topology",
-  useGeographies: () => ({
+      objects: {
-    geographies: [{ rsmKey: "geo-1", id: 840 }],
+        countries: {
-    path: { centroid: () => [10, 10] },
+          type: "GeometryCollection",
+          geometries: [
+            {
+              type: "Polygon",
+              arcs: [[0]],
+              id: "840",
+            },
+          ],
+        },
+      },
+      arcs: [[[0, 0], [10, 0], [10, 10], [0, 10], [0, 0]]],
+      transform: {
+        scale: [1, 1],
+        translate: [0, 0],
+      },
+    },
   }),
-}));
+);
 
 import { WorldMap } from "../WorldMap";
 
@@ -34,19 +49,20 @@ describe("WorldMap", () => {
       </FluentProvider>,
     );
 
-    // Tooltip should not be present initially
     expect(screen.queryByRole("tooltip")).toBeNull();
 
-    // Country map area is exposed as an accessible button with an accurate label
     const countryButton = screen.getByRole("button", { name: "US: 42 bans" });
     expect(countryButton).toBeInTheDocument();
 
+    expect(screen.getByRole("button", { name: /Zoom in/i })).toBeInTheDocument();
+    expect(screen.getByRole("button", { name: /Zoom out/i })).toBeInTheDocument();
+    expect(screen.getByRole("button", { name: /Reset view/i })).toBeInTheDocument();
+
     fireEvent.mouseEnter(countryButton, { clientX: 10, clientY: 10 });
 
     const tooltip = screen.getByRole("tooltip");
     expect(tooltip).toHaveTextContent("United States");
     expect(tooltip).toHaveTextContent("42 bans");
-    expect(tooltip).toHaveStyle({ left: "22px", top: "22px" });
 
     fireEvent.mouseLeave(countryButton);
     expect(screen.queryByRole("tooltip")).toBeNull();

frontend/src/data/isoNumericToAlpha2.ts

@@ -8,6 +8,7 @@
 export const ISO_NUMERIC_TO_ALPHA2: Record<string, string> = {
   "4": "AF",
   "8": "AL",
+  "10": "AQ",
   "12": "DZ",
   "16": "AS",
   "20": "AD",
@@ -46,6 +47,7 @@ export const ISO_NUMERIC_TO_ALPHA2: Record<string, string> = {
   "148": "TD",
   "152": "CL",
   "156": "CN",
+  "158": "TW",
   "162": "CX",
   "166": "CC",
   "170": "CO",
@@ -76,6 +78,7 @@ export const ISO_NUMERIC_TO_ALPHA2: Record<string, string> = {
   "250": "FR",
   "254": "GF",
   "258": "PF",
+  "260": "TF",
   "262": "DJ",
   "266": "GA",
   "268": "GE",
@@ -107,6 +110,7 @@ export const ISO_NUMERIC_TO_ALPHA2: Record<string, string> = {
   "372": "IE",
   "376": "IL",
   "380": "IT",
+  "384": "CI",
   "388": "JM",
   "392": "JP",
   "398": "KZ",

frontend/tsconfig.json

@@ -8,6 +8,8 @@
 
     /* Bundler mode */
     "moduleResolution": "bundler",
+    "resolveJsonModule": true,
+    "allowSyntheticDefaultImports": true,
     "allowImportingTsExtensions": true,
     "isolatedModules": true,
     "moduleDetection": "force",