Canvas: build application infrastructure with drag and drop

Change-Id: I5cfd12e67794f3376c5c025af29470d52d77cf16
diff --git a/apps/canvas/src/components/resources.tsx b/apps/canvas/src/components/resources.tsx
new file mode 100644
index 0000000..7471c1f
--- /dev/null
+++ b/apps/canvas/src/components/resources.tsx
@@ -0,0 +1,51 @@
+import { Button } from "@/components/ui/button";
+import { ReactFlowInstance, useReactFlow } from "@xyflow/react";
+import { v4 as uuidv4 } from "uuid";
+import { useCallback, useState } from "react";
+import { Accordion, AccordionTrigger } from "./ui/accordion";
+import { AccordionContent, AccordionItem } from "@radix-ui/react-accordion";
+import { useCategories } from "@/lib/state";
+import { CategoryItem } from "@/lib/categories";
+import { Icon } from "./icon";
+
+function addResource(i: CategoryItem, flow: ReactFlowInstance) {
+  flow.addNodes({
+    id: uuidv4(),
+    position: {
+      x: 0,
+      y: 0,
+    },
+    type: i.type,
+    connectable: true,
+    data: i.init,
+  });
+}
+
+export function Resources() {
+  let flow = useReactFlow();
+  const categories = useCategories();
+  let onResourceAdd = useCallback((item: CategoryItem) => {
+    return () => addResource(item, flow);
+  }, [flow]);
+  const [open, setOpen] = useState<string[]>(categories.map((c) => c.title));
+  return (
+    <>
+      <Accordion type="multiple" value={open} onValueChange={(v) => setOpen(v)}>
+        {categories.map((c) => (
+          <AccordionItem key={c.title} value={c.title} className={"px-3" + (c.active ? " bg-amber-100" : "")}>
+            <AccordionTrigger>
+              {c.title}
+            </AccordionTrigger>
+            <AccordionContent>
+              <div className="flex flex-col space-y-1">
+                {c.items.map((item) => (
+                  <Button key={item.title} onClick={onResourceAdd(item)} style={{ justifyContent: "flex-start" }}>{Icon(item.type)}{item.title}</Button>
+                ))}
+              </div>
+            </AccordionContent>
+          </AccordionItem>
+        ))}
+      </Accordion>
+    </>
+  );
+}