build: Migrate to flat project structure

This change updates the project structure to become flattened.
Previously, the simulator, frontend and API each lived into their own
directory.

With this change, all modules of the project live in the top-level
directory of the repository. This should improve discoverability of
modules of the project.

2 files changed, 76 insertions, 0 deletions

diff --git a/opendc-web/opendc-web-ui/src/store/middlewares/dummy-middleware.js b/opendc-web/opendc-web-ui/src/store/middlewares/dummy-middleware.js
new file mode 100644
index 00000000..5ba35691
--- /dev/null
+++ b/opendc-web/opendc-web-ui/src/store/middlewares/dummy-middleware.js
@@ -0,0 +1,3 @@
+export const dummyMiddleware = (store) => (next) => (action) => {
+    next(action)
+}
diff --git a/opendc-web/opendc-web-ui/src/store/middlewares/viewport-adjustment.js b/opendc-web/opendc-web-ui/src/store/middlewares/viewport-adjustment.js
new file mode 100644
index 00000000..b4472c54
--- /dev/null
+++ b/opendc-web/opendc-web-ui/src/store/middlewares/viewport-adjustment.js
@@ -0,0 +1,73 @@
+import { SET_MAP_DIMENSIONS, setMapPosition, setMapScale } from '../../actions/map'
+import { SET_CURRENT_TOPOLOGY } from '../../actions/topology/building'
+import {
+    MAP_MAX_SCALE,
+    MAP_MIN_SCALE,
+    SIDEBAR_WIDTH,
+    TILE_SIZE_IN_PIXELS,
+    VIEWPORT_PADDING,
+} from '../../components/app/map/MapConstants'
+import { calculateRoomListBounds } from '../../util/tile-calculations'
+
+export const viewportAdjustmentMiddleware = (store) => (next) => (action) => {
+    const state = store.getState()
+
+    let topologyId = '-1'
+    let mapDimensions = {}
+    if (action.type === SET_CURRENT_TOPOLOGY && action.topologyId !== '-1') {
+        topologyId = action.topologyId
+        mapDimensions = state.map.dimensions
+    } else if (action.type === SET_MAP_DIMENSIONS && state.currentTopologyId !== '-1') {
+        topologyId = state.currentTopologyId
+        mapDimensions = { width: action.width, height: action.height }
+    }
+
+    if (topologyId !== '-1') {
+        const roomIds = state.objects.topology[topologyId].roomIds
+        const rooms = roomIds.map((id) => Object.assign({}, state.objects.room[id]))
+        rooms.forEach((room) => (room.tiles = room.tileIds.map((tileId) => state.objects.tile[tileId])))
+
+        let hasNoTiles = true
+        for (let i in rooms) {
+            if (rooms[i].tiles.length > 0) {
+                hasNoTiles = false
+                break
+            }
+        }
+
+        if (!hasNoTiles) {
+            const viewportParams = calculateParametersToZoomInOnRooms(rooms, mapDimensions.width, mapDimensions.height)
+            store.dispatch(setMapPosition(viewportParams.newX, viewportParams.newY))
+            store.dispatch(setMapScale(viewportParams.newScale))
+        }
+    }
+
+    next(action)
+}
+
+function calculateParametersToZoomInOnRooms(rooms, mapWidth, mapHeight) {
+    const bounds = calculateRoomListBounds(rooms)
+    const newScale = calculateNewScale(bounds, mapWidth, mapHeight)
+
+    // Coordinates of the center of the room, relative to the global origin of the map
+    const roomCenterCoordinates = {
+        x: bounds.center.x * TILE_SIZE_IN_PIXELS * newScale,
+        y: bounds.center.y * TILE_SIZE_IN_PIXELS * newScale,
+    }
+
+    const newX = -roomCenterCoordinates.x + mapWidth / 2
+    const newY = -roomCenterCoordinates.y + mapHeight / 2
+
+    return { newScale, newX, newY }
+}
+
+function calculateNewScale(bounds, mapWidth, mapHeight) {
+    const width = bounds.max.x - bounds.min.x
+    const height = bounds.max.y - bounds.min.y
+
+    const scaleX = (mapWidth - 2 * SIDEBAR_WIDTH) / (width * TILE_SIZE_IN_PIXELS + 2 * VIEWPORT_PADDING)
+    const scaleY = mapHeight / (height * TILE_SIZE_IN_PIXELS + 2 * VIEWPORT_PADDING)
+    const newScale = Math.min(scaleX, scaleY)
+
+    return Math.min(Math.max(MAP_MIN_SCALE, newScale), MAP_MAX_SCALE)
+}