feat: reorganize files and implement ui and sidebar

app/actions.ts

@@ -1,7 +1,40 @@
 'use server'
 
-import { kv } from '@vercel/kv'
 import { revalidatePath } from 'next/cache'
+import { kv } from '@vercel/kv'
+
+import { type Chat } from '@/lib/types'
+
+export async function getChats(userId: string) {
+  try {
+    const pipeline = kv.pipeline()
+    const chats: string[] = await kv.zrange(`user:chat:${userId}`, 0, -1)
+
+    for (const chat of chats) {
+      pipeline.hgetall(chat)
+    }
+
+    const results = await pipeline.exec()
+
+    return results as Chat[]
+  } catch (error) {
+    return []
+  }
+}
+
+export async function getChat(id: string, userId: string) {
+  const chat = await kv.hgetall<Chat>(`chat:${id}`)
+
+  if (!chat) {
+    throw new Error('Not found')
+  }
+
+  if (userId && chat.userId !== userId) {
+    throw new Error('Unauthorized')
+  }
+
+  return chat
+}
 
 export async function removeChat({
   id,