{
 "cells": [
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# Personal Knowledge Worker\n",
    "\n",
    "Search through your exported Notion Workspace with Gemini models using RAG.\n",
    "\n",
    "How to export the content from Notion: https://www.notion.com/help/export-your-content"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Imports and Setup"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "!pip install -U -q langchain-google-genai"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "import os\n",
    "import re\n",
    "import glob\n",
    "from dotenv import load_dotenv\n",
    "import gradio as gr\n",
    "import numpy as np"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "from langchain.document_loaders import DirectoryLoader, TextLoader\n",
    "from langchain.text_splitter import CharacterTextSplitter\n",
    "from langchain.schema import Document\n",
    "from langchain_chroma import Chroma\n",
    "from langchain_google_genai import GoogleGenerativeAIEmbeddings, ChatGoogleGenerativeAI\n",
    "from langchain.memory import ConversationBufferMemory\n",
    "from langchain.chains import ConversationalRetrievalChain"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "LLM_MODEL = \"gemini-2.5-flash-lite\"\n",
    "EMBEDDINGS_MODEL = \"models/gemini-embedding-001\"\n",
    "db_name = \"vector_db\""
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "load_dotenv()\n",
    "os.environ['GOOGLE_API_KEY'] = os.getenv('GOOGLE_API_KEY', 'your-key-if-not-using-env')"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Vector DB Setup"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### Clean up and Load Documents"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "# Clean up the Notion directory, remove MD5 hashes from filenames and directory names\n",
    "\n",
    "# Root directory of your export\n",
    "root_dir = \"notion_export\"\n",
    "\n",
    "# Regex to match the hash: space + 24-32 hex chars (sometimes longer)\n",
    "hash_pattern = re.compile(r\"\\s[0-9a-f]{16,32}(_all)?\")\n",
    "\n",
    "for dirpath, dirnames, filenames in os.walk(root_dir, topdown=False):\n",
    "    # Rename files\n",
    "    for filename in filenames:\n",
    "        new_name = re.sub(hash_pattern, \"\", filename)\n",
    "        if new_name != filename:\n",
    "            old_path = os.path.join(dirpath, filename)\n",
    "            new_path = os.path.join(dirpath, new_name)\n",
    "            print(f\"Renaming file: {old_path} -> {new_path}\")\n",
    "            os.rename(old_path, new_path)\n",
    "\n",
    "    # Rename directories\n",
    "    for dirname in dirnames:\n",
    "        new_name = re.sub(hash_pattern, \"\", dirname)\n",
    "        if new_name != dirname:\n",
    "            old_path = os.path.join(dirpath, dirname)\n",
    "            new_path = os.path.join(dirpath, new_name)\n",
    "            print(f\"Renaming dir: {old_path} -> {new_path}\")\n",
    "            os.rename(old_path, new_path)\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "# Read in documents using LangChain's loaders\n",
    "\n",
    "documents = []\n",
    "for dirpath, dirnames, filenames in os.walk(root_dir):\n",
    "    # Define doc_type relative to root_dir\n",
    "    doc_type = os.path.relpath(dirpath, root_dir)\n",
    "\n",
    "    # for main pages in Notion\n",
    "    if doc_type == \".\":\n",
    "        doc_type = \"Main\"\n",
    "    \n",
    "    loader = DirectoryLoader(\n",
    "        dirpath,\n",
    "        glob=\"**/*.md\",  # recursive match inside dirpath\n",
    "        loader_cls=TextLoader\n",
    "    )\n",
    "    \n",
    "    folder_docs = loader.load()\n",
    "    for doc in folder_docs:\n",
    "        doc.metadata[\"doc_type\"] = doc_type\n",
    "        documents.append(doc)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### Create chunks"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "text_splitter = CharacterTextSplitter(chunk_size=800, chunk_overlap=200)\n",
    "chunks = text_splitter.split_documents(documents)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "len(chunks)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "doc_types = set(chunk.metadata['doc_type'] for chunk in chunks)\n",
    "print(f\"Document types found: {', '.join(doc_types)}\")"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### Create Embeddings"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "embeddings = GoogleGenerativeAIEmbeddings(model=EMBEDDINGS_MODEL)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "# If you don't want to recreate the collection\n",
    "\n",
    "vectorstore = Chroma(embedding_function=embeddings, persist_directory=db_name)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "# Check if a Chroma Datastore already exists - if so, delete the collection to start from scratch\n",
    "\n",
    "if os.path.exists(db_name):\n",
    "    Chroma(persist_directory=db_name, embedding_function=embeddings).delete_collection()\n",
    "\n",
    "# Create our Chroma vectorstore!\n",
    "\n",
    "vectorstore = Chroma.from_documents(documents=chunks, embedding=embeddings, persist_directory=db_name)\n",
    "print(f\"Vectorstore created with {vectorstore._collection.count()} documents\")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "# Get one vector and find how many dimensions it has\n",
    "\n",
    "collection = vectorstore._collection\n",
    "sample_embedding = collection.get(limit=1, include=[\"embeddings\"])[\"embeddings\"][0]\n",
    "dimensions = len(sample_embedding)\n",
    "print(f\"The vectors have {dimensions:,} dimensions\")"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## RAG pipeline using LangChain"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "# create a new Chat with ChatGoogleGenerativeAI\n",
    "llm = ChatGoogleGenerativeAI(model=LLM_MODEL, temperature=0.7)\n",
    "\n",
    "# set up the conversation memory for the chat\n",
    "memory = ConversationBufferMemory(memory_key='chat_history', return_messages=True)\n",
    "\n",
    "# the retriever is an abstraction over the VectorStore that will be used during RAG\n",
    "retriever = vectorstore.as_retriever()\n",
    "\n",
    "# putting it together: set up the conversation chain with the GPT 4o-mini LLM, the vector store and memory\n",
    "conversation_chain = ConversationalRetrievalChain.from_llm(llm=llm, retriever=retriever, memory=memory)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Gradio User Interface"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "def chat(message, history):\n",
    "    result = conversation_chain.invoke({\"question\": message})\n",
    "    return result[\"answer\"]"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "view = gr.ChatInterface(chat, type=\"messages\").launch(inbrowser=True)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  }
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