Allow user to duplicate prompt (#57)

* Add dropdown header for model switching

* Allow variant duplication

* Fix prettier

src/server/utils/reorderPromptVariants.ts

@@ -0,0 +1,65 @@
+import { prisma } from "~/server/db";
+
+export const reorderPromptVariants = async (
+  movedId: string,
+  stationaryTargetId: string,
+  alwaysInsertRight?: boolean,
+) => {
+  const moved = await prisma.promptVariant.findUnique({
+    where: {
+      id: movedId,
+    },
+  });
+
+  const target = await prisma.promptVariant.findUnique({
+    where: {
+      id: stationaryTargetId,
+    },
+  });
+
+  if (!moved || !target || moved.experimentId !== target.experimentId) {
+    throw new Error(`Prompt Variant with id ${movedId} or ${stationaryTargetId} does not exist`);
+  }
+
+  const visibleItems = await prisma.promptVariant.findMany({
+    where: {
+      experimentId: moved.experimentId,
+      visible: true,
+    },
+    orderBy: {
+      sortIndex: "asc",
+    },
+  });
+
+  // Remove the moved item from its current position
+  const orderedItems = visibleItems.filter((item) => item.id !== moved.id);
+
+  // Find the index of the moved item and the target item
+  const movedIndex = visibleItems.findIndex((item) => item.id === moved.id);
+  const targetIndex = visibleItems.findIndex((item) => item.id === target.id);
+
+  // Determine the new index for the moved item
+  let newIndex;
+  if (movedIndex < targetIndex || alwaysInsertRight) {
+    newIndex = targetIndex + 1; // Insert after the target item
+  } else {
+    newIndex = targetIndex; // Insert before the target item
+  }
+
+  // Insert the moved item at the new position
+  orderedItems.splice(newIndex, 0, moved);
+
+  // Now, we need to update all the items with their new sortIndex
+  await prisma.$transaction(
+    orderedItems.map((item, index) => {
+      return prisma.promptVariant.update({
+        where: {
+          id: item.id,
+        },
+        data: {
+          sortIndex: index,
+        },
+      });
+    }),
+  );
+};