1 files changed, 95 insertions, 0 deletions
diff --git a/web-timeplot/src/core/store.js b/web-timeplot/src/core/store.js
new file mode 100644
index 0000000..9989e5f
--- /dev/null
+++ b/web-timeplot/src/core/store.js
@@ -0,0 +1,95 @@
+function clonePanelState(panels) {
+    return Object.fromEntries(Object.entries(panels).map(([key, value]) => [key, { ...value }]));
+}
+
+export function createInitialState() {
+    return {
+        app: {
+            title: 'TimePlot',
+            renderer: 'pending',
+        },
+        time: {
+            realNowMs: Date.now(),
+            realElapsedMs: 0,
+            plotTimeMs: 0,
+            speed: 1,
+            paused: false,
+        },
+        plot: {
+            showGrid: true,
+            showPoints: true,
+            windowDurationMs: 20000,
+            maxPoints: 1600,
+            valueRange: {
+                min: -1.6,
+                max: 1.6,
+            },
+            hoveredPoint: null,
+            tooltip: {
+                visible: false,
+                x: 0,
+                y: 0,
+                point: null,
+            },
+        },
+        source: {
+            activeId: 'synthetic-wave',
+            preset: 'telemetry',
+            sampleRateHz: 60,
+            amplitude: 1,
+            noise: 0.08,
+        },
+        panels: {
+            status: { title: 'Status', visible: true },
+            source: { title: 'Data Source', visible: true },
+            config: { title: 'Config', visible: true },
+            help: { title: 'Help', visible: false },
+        },
+    };
+}
+
+export class Store {
+    constructor(initialState = createInitialState()) {
+        this.state = initialState;
+        this.listeners = new Set();
+    }
+
+    getState() {
+        return this.state;
+    }
+
+    subscribe(listener) {
+        this.listeners.add(listener);
+        return () => this.listeners.delete(listener);
+    }
+
+    setState(updater) {
+        const nextState = typeof updater === 'function' ? updater(this.state) : updater;
+        this.state = nextState;
+        for (const listener of this.listeners) {
+            listener(this.state);
+        }
+    }
+
+    patch(partial) {
+        this.setState((state) => ({
+            ...state,
+            ...partial,
+            time: partial.time ? { ...state.time, ...partial.time } : state.time,
+            plot: partial.plot
+                ? {
+                    ...state.plot,
+                    ...partial.plot,
+                    valueRange: partial.plot.valueRange
+                        ? { ...state.plot.valueRange, ...partial.plot.valueRange }
+                        : state.plot.valueRange,
+                    tooltip: partial.plot.tooltip
+                        ? { ...state.plot.tooltip, ...partial.plot.tooltip }
+                        : state.plot.tooltip,
+                }
+                : state.plot,
+            source: partial.source ? { ...state.source, ...partial.source } : state.source,
+            panels: partial.panels ? clonePanelState({ ...state.panels, ...partial.panels }) : state.panels,
+        }));
+    }
+}