app.py

import streamlit as st
import os
from PIL import Image
from neo4j import GraphDatabase
from chainguard.blockchain_logger import BlockchainLogger

# Blockchain Logger
blockchain_logger = BlockchainLogger()

# Neo4j Handler
class Neo4jHandler:
    def __init__(self, uri, user, password):
        self.driver = GraphDatabase.driver(uri, auth=(user, password))

    def close(self):
        self.driver.close()

    def log_transaction(self, file_name, file_path, blockchain_hash):
        """Log transactions to Neo4j."""
        with self.driver.session() as session:
            session.write_transaction(self._create_transaction_node, file_name, file_path, blockchain_hash)

    @staticmethod
    def _create_transaction_node(tx, file_name, file_path, blockchain_hash):
        tx.run(
            """
            MERGE (t:Transaction {file_name: $file_name, file_path: $file_path, blockchain_hash: $blockchain_hash})
            RETURN t
            """,
            file_name=file_name, file_path=file_path, blockchain_hash=blockchain_hash
        )

# Metadata Logging
def log_metadata(file_name, tags, album):
    """Log metadata to Chagu blockchain."""
    metadata = {"file_name": file_name, "tags": tags, "album": album}
    block_details = blockchain_logger.log_data(metadata)
    return block_details

# Streamlit Layout
st.title("Memora: Secure File Upload with Blockchain & Neo4j")
st.subheader("Securely upload, organize, and query your files")

# Directory for storing uploaded files
UPLOAD_DIR = "uploaded_files"
os.makedirs(UPLOAD_DIR, exist_ok=True)

# File Upload
uploaded_files = st.file_uploader("Upload your files", accept_multiple_files=True, type=['jpg', 'jpeg', 'png', 'mp4', 'avi'])

if uploaded_files:
    # Neo4j Setup
    neo4j_handler = Neo4jHandler(
        uri="neo4j+s://0ca71b10.databases.neo4j.io",
        user="neo4j",
        password="XXX"
    )

    for uploaded_file in uploaded_files:
        # Save file locally
        file_path = os.path.join(UPLOAD_DIR, uploaded_file.name)
        with open(file_path, "wb") as f:
            f.write(uploaded_file.getbuffer())
        st.success(f"File saved locally: {file_path}")

        # Display file details
        if uploaded_file.type.startswith('image'):
            image = Image.open(uploaded_file)
            st.image(image, caption=uploaded_file.name, use_column_width=True)

        # Metadata Input
        album = st.text_input(f"Album for {uploaded_file.name}", "Default Album")
        tags = st.text_input(f"Tags for {uploaded_file.name} (comma-separated)", "")

        if st.button(f"Log Metadata for {uploaded_file.name}"):
            metadata = log_metadata(uploaded_file.name, tags.split(','), album)
            blockchain_hash = metadata.get('block_hash', 'N/A')
            neo4j_handler.log_transaction(uploaded_file.name, file_path, blockchain_hash)
            st.write(f"Metadata logged successfully! Blockchain Details: {metadata}")

    neo4j_handler.close()

# Blockchain Integrity Validation
if st.button("Validate Blockchain Integrity"):
    is_valid = blockchain_logger.is_blockchain_valid()
    st.write("Blockchain Integrity:", "Valid ✅" if is_valid else "Invalid ❌")

# Query System
st.subheader("Query Files")
query = st.text_input("Enter your query (e.g., 'Good comedy')")
if st.button("Search"):
    # Simulating query processing
    result = {"response": f"Mock result for '{query}'"}
    st.write(f"Query Result: {result['response']}")