src/trust_agent.py

import os
import requests
import json
import threading
import pandas as pd
import csv
import time
import re
import asyncio
from threading import Lock
from web3 import Web3
try:
    from web3.middleware import ExtraDataToPOAMiddleware as geth_poa_middleware
except ImportError:
    from web3.middleware import geth_poa_middleware

# Hardcoded ABI removed! Loaded dynamically via config.py / dynamic_compiler.py
class AgentTrust:
    def __init__(self, config):
        self.config = config
        self.lock = Lock()
        self.active_tasks = 0
        self.hf_manager_ref = None 
        self.last_latency = 0.0
        self.queue_file = "/app/pending_tx_queue.json"
        self.HISTORY_FILE = "/app/minted_history.csv"
        
        # 1. Hugging Face Queue Recovery
        try:
            from huggingface_hub import hf_hub_download
            print("☁️ Checking Hugging Face for existing pending transaction queue...")
            downloaded_path = hf_hub_download(
                repo_id="toecm/PureChain_Dataset",
                repo_type="dataset",
                filename="pending_tx_queue.json",
                token=getattr(self.config, 'HF_TOKEN', None) 
            )
            with open(downloaded_path, "r") as src, open(self.queue_file, "w") as dst:
                dst.write(src.read())
            print("✅ Successfully recovered pending queue from Hugging Face!")
        except Exception as e:
            print("ℹ️ No existing queue found on Hugging Face. Starting fresh.")
        
        # 2. 🟢 WEB3 & WALLET INITIALIZATION (The Missing Piece)
        self.w3 = None
        self.account = None
        
        if self.config.PRIVATE_KEY and self.config.PURECHAIN_RPC_URL:
            try:
                # Connect to your Korean Node (Port 8548)
                self.w3 = Web3(Web3.HTTPProvider(self.config.PURECHAIN_RPC_URL))
                
                # Inject POA middleware (Required for Geth/Private Chains)
                self.w3.middleware_onion.inject(geth_poa_middleware, layer=0)
                
                if self.w3.is_connected():
                    self.account = self.w3.eth.account.from_key(self.config.PRIVATE_KEY)
                    print(f"🔗 Web3 Connected! Wallet: {self.account.address}")
                    
                    # 🟢 DYNAMIC AUTO-DEPLOY LOGIC
                    if not self.config.PURECHAIN_CONTRACT_ADDRESS or self.config.PURECHAIN_CONTRACT_ADDRESS == "YOUR_CONTRACT_ADDRESS_HERE":
                        print("⚠️ No valid contract address found in config/env. Auto-deploying a new instance...")
                        try:
                            from src.dynamic_compiler import get_contract_interface
                            abi, bytecode = get_contract_interface()
                            
                            Contract = self.w3.eth.contract(abi=abi, bytecode=bytecode)
                            tx = Contract.constructor().build_transaction({
                                'from': self.account.address,
                                'nonce': self.w3.eth.get_transaction_count(self.account.address),
                                'gas': 3000000,
                                'gasPrice': 0,
                                'chainId': getattr(self.config, 'PURECHAIN_ID', 900520900520)
                            })
                            signed_tx = self.w3.eth.account.sign_transaction(tx, self.config.PRIVATE_KEY)
                            tx_hash = self.w3.eth.send_raw_transaction(signed_tx.raw_transaction)
                            print("⏳ Deploying contract... waiting for receipt.")
                            tx_receipt = self.w3.eth.wait_for_transaction_receipt(tx_hash)
                            
                            new_address = tx_receipt.contractAddress
                            print(f"🎉 CONTRACT DEPLOYED DYNAMICALLY AT: {new_address}")
                            
                            # Set it in memory for this session
                            self.config.PURECHAIN_CONTRACT_ADDRESS = new_address
                            os.environ["PURECHAIN_CONTRACT_ADDRESS"] = new_address
                            # Also inject into config object dynamically
                            self.config.CONTRACT_ABI = abi
                        except Exception as de:
                            print(f"❌ Auto-deploy failed: {de}")
                else:
                    print(f"⚠️ Failed to connect to node at {self.config.PURECHAIN_RPC_URL}")
            except Exception as e:
                print(f"❌ Web3 Init Error: {e}")

        print("🛡️ Agent 4 (Trust) Online: Async Saving & Retry Queue Enabled.")

        # 🟢 START BACKGROUND RETRY LOOP
        threading.Thread(target=self._retry_queue_loop, daemon=True).start()

    # --- THE DEAD LETTER QUEUE LOGIC ---
    def add_to_queue(self, data_dict):
        with self.lock:
            queue = []
            if os.path.exists(self.queue_file):
                try:
                    with open(self.queue_file, "r") as f:
                        queue = json.load(f)
                except: pass
            queue.append(data_dict)
            with open(self.queue_file, "w") as f:
                json.dump(queue, f, indent=2)

    def _retry_queue_loop(self):
        loop = asyncio.new_event_loop()
        asyncio.set_event_loop(loop)

        try:
            while True:
                time.sleep(60) # Check the queue every 60 seconds
                if not os.path.exists(self.queue_file): continue

                with self.lock:
                    try:
                        with open(self.queue_file, "r") as f:
                            queue = json.load(f)
                    except: queue = []

                if not queue: continue

                # Check if node is back online
                if not self.w3 or not self.w3.is_connected():
                    continue

                total_queued = len(queue)
                print(f"🔄 Node Online! Attempting to mint {total_queued} queued transactions...")

                remaining_queue = []
                success_count = 0 # Track successes

                for data in queue:
                    result = self.stamp_on_chain(data) # Removed from_queue=True as it's not in the signature
                    if result:
                        success_count += 1
                    else:
                        remaining_queue.append(data)

                # --- NOTIFICATION LOGIC ---
                if success_count > 0:
                    print(f"\n🔔 [TRUST AGENT ALERT] Successfully cleared {success_count}/{total_queued} backlog transactions.")
                    if not remaining_queue:
                        print("✅ ALL PENDING TRANSACTIONS MINTED. Queue is now empty.\n")
                    else:
                        print(f"⚠️ {len(remaining_queue)} transactions failed again and remain in queue.\n")

                # Update the queue file with whatever is left
                with self.lock:
                    with open(self.queue_file, "w") as f:
                        json.dump(remaining_queue, f, indent=2)
        finally:
            loop.close()

    def get_unique_origins(self):
        try:
            # 1. Define the history file path inside the function
            history_file = "/app/minted_history.csv" 
            if not os.path.exists(history_file):
                return []
            
            # 2. Read the history and get unique values from Data_Origin
            df = pd.read_csv(history_file)
            if "Data_Origin" in df.columns:
                return sorted(df["Data_Origin"].dropna().unique().tolist())
            return []
        except Exception as e:
            print(f"Error fetching unique origins: {e}")
            return []
        
    # --- IPFS HELPERS ---
    def upload_file_to_pinata(self, filepath):
        url = "https://api.pinata.cloud/pinning/pinFileToIPFS"
        headers = {"Authorization": f"Bearer {self.config.PINATA_JWT}"}
        try:
            with open(filepath, 'rb') as f:
                files = {'file': f}
                response = requests.post(url, headers=headers, files=files)
                return response.json().get('IpfsHash')
        except Exception as e:
            return None

    def log_to_ipfs(self, data):
        if not self.config.PINATA_JWT: return "Local-Log-Only"
        headers = {"Authorization": f"Bearer {self.config.PINATA_JWT}"}
        try:
            res = requests.post("https://api.pinata.cloud/pinning/pinJSONToIPFS", headers=headers, json=data)
            return res.json().get("IpfsHash", "Error")
        except: return "IPFS_Fail"

    # --- CORE BLOCKCHAIN LOGIC ---
    def stamp_on_chain(self, payload):
        """
        Hashes the validated sociolinguistic data and mints it to the Purechain ledger
        using the PureVersation contract's proposeEntry function.
        """
        import json
        import hashlib
        import os
        from web3 import Web3
        try:
            from web3.middleware import ExtraDataToPOAMiddleware as geth_poa_middleware
        except ImportError:
            from web3.middleware import geth_poa_middleware
        
        print("\n" + "="*40)
        print("⛓️ INITIATING PURECHAIN MINTING SEQUENCE")
        
        try:
            # 1. Load Environment Variables (Updated to match your secrets)
            rpc_url = os.environ.get("PURECHAIN_RPC_URL")
            private_key = os.environ.get("PRIVATE_KEY")
            contract_address = os.environ.get("PURECHAIN_CONTRACT_ADDRESS")
            
            if not all([rpc_url, private_key, contract_address]):
                print("⚠️ Purechain skipped: Missing RPC_URL, PRIVATE_KEY, or PURECHAIN_CONTRACT_ADDRESS.")
                return False

            # 2. Establish Network Connection
            w3 = Web3(Web3.HTTPProvider(rpc_url))
            w3.middleware_onion.inject(geth_poa_middleware, layer=0) # PoA compatibility

            if not w3.is_connected():
                print("🔴 Purechain connection failed. Network may be offline.")
                return False

            account = w3.eth.account.from_key(private_key)
            wallet_address = account.address
            print(f"✅ Authenticated as Operator: {wallet_address}")

            # 3. Cryptographic Hashing of the Data
            # We hash the full JSON payload to use as our "IPFS CID" / Data Hash proof
            payload_str = json.dumps(payload, sort_keys=True)
            data_hash = hashlib.sha256(payload_str.encode('utf-8')).hexdigest()
            print(f"🔒 Payload SHA-256 Proof: {data_hash}")

            # 4. Load the Smart Contract using your config.py ABI
            # Ensure your config is imported/available in trust_agent.py
            contract = w3.eth.contract(address=contract_address, abi=self.config.CONTRACT_ABI)

            # 5. Extract values for the proposeEntry parameters
            # function proposeEntry(string _phrase, string _dialect, string _ipfsCid, string _license)
            phrase = payload.get("original", "Unknown Utterance")
            dialect = payload.get("dialect", "Unknown Dialect")
            license_type = "CC-BY-4.0 (Open Research)" # Academic open data license

            # 🟢 FIX: Web3 Checksumming and Length Validation
            raw_operator = str(payload.get("user", wallet_address)).strip().lower()
            
            # Ensure it is exactly 42 characters and starts with 0x
            if raw_operator.startswith("0x") and len(raw_operator) == 42:
                try:
                    # Web3 strictly requires addresses to be checksummed (mixed upper/lower case hex)
                    final_operator_id = w3.to_checksum_address(raw_operator)
                except Exception:
                    final_operator_id = w3.to_checksum_address(wallet_address)
            else:
                # If the React ID is missing or broken, fallback to the Lab Admin
                final_operator_id = w3.to_checksum_address(wallet_address)

            # 6. Build the Transaction
            nonce = w3.eth.get_transaction_count(wallet_address)
            
            # 🟢 UPDATED: Pass the finalized, checksummed address
            tx = contract.functions.proposeEntry(
                phrase, 
                dialect, 
                data_hash, 
                license_type,
                final_operator_id
            ).build_transaction({
                'chainId': w3.eth.chain_id,
                'gas': 2000000, 
                'gasPrice': 0,
                'nonce': nonce,
            })

            # 7. Sign and Broadcast
            signed_tx = w3.eth.account.sign_transaction(tx, private_key)
            tx_hash = w3.eth.send_raw_transaction(signed_tx.raw_transaction)
            hex_hash = w3.to_hex(tx_hash)
            
            print(f"🚀 Transaction Broadcasted! TX Hash: {hex_hash}")

            # 8. Wait for Confirmation
            receipt = w3.eth.wait_for_transaction_receipt(tx_hash, timeout=120)
            
            if receipt.status == 1:
                print(f"💎 SUCCESS: Entry '{phrase[:15]}...' irreversibly minted in Block {receipt.blockNumber}")
                
                # OPTIONAL: Save the receipt to your Gradio Transaction History tab
                if hasattr(self, '_log_transaction_history'):
                    self._log_transaction_history(payload, hex_hash, receipt.blockNumber)
                return True
            else:
                print("⚠️ Transaction reverted by the EVM. (Check if wallet is registered)")
                return False

        except Exception as e:
            import traceback
            print(f"\n❌ SMART CONTRACT ERROR ❌\n{e}")
            traceback.print_exc()
            return False
        finally:
            print("="*40 + "\n")

    def log_mint_to_history(self, utterance, dialect, tx_hash, block_num, cid):
        history_file = "/app/minted_history.csv"
        new_entry = {
            "Timestamp": pd.Timestamp.now().strftime('%Y-%m-%d %H:%M:%S'),
            "Utterance": utterance, "Dialect": dialect, "Data_Origin": "Lab UI", # Match UI columns
            "Block": block_num, "Speed": f"{self.last_latency}s", "TX Hash": tx_hash, "IPFS CID": cid
        }
        df = pd.DataFrame([new_entry])
        
        with self.lock:
            # 1. Save Locally
            if not os.path.exists(history_file): 
                df.to_csv(history_file, index=False)
            else: 
                df.to_csv(history_file, mode='a', header=False, index=False)
                
            # 2. ☁️ Push the History File to Hugging Face
            try:
                hf_token = os.environ.get("HF_TOKEN")
                repo_id = getattr(self.config, "HF_REPO_ID", "toecm/IEDID") # Fallback to your main dataset
                if hf_token:
                    from huggingface_hub import HfApi
                    api = HfApi(token=hf_token)
                    print("☁️ Syncing minted_history.csv to Hugging Face...")
                    api.upload_file(
                        path_or_fileobj=history_file,
                        path_in_repo="minted_history.csv",
                        repo_id=repo_id,
                        repo_type="dataset",
                        commit_message="📜 Blockchain TX History Updated"
                    )
            except Exception as e:
                print(f"⚠️ Failed to sync history to HF: {e}")

    def get_filtered_history(self, start_date=None, end_date=None):
        """Safely reads and filters the PureChain minted history for the Gradio UI."""
        import pandas as pd
        import os
        
        history_file = getattr(self, 'HISTORY_FILE', "/app/minted_history.csv")
        
        # The columns your Gradio UI expects
        expected_cols = ["Timestamp", "Utterance", "Dialect", "Data_Origin", "Data_Approved", "Block", "Speed", "TX Hash", "IPFS CID"]
        
        # 1. Safe File Check
        if not os.path.exists(history_file):
            return pd.DataFrame(columns=expected_cols)

        try:
            df = pd.read_csv(history_file)
            
            # 2. Add missing columns safely (in case of old CSV formats)
            for col in expected_cols:
                if col not in df.columns:
                    df[col] = "Unknown" if col == "Data_Origin" else ""
            
            if df.empty:
                return df
                
            # 3. Safe Date Parsing (Ignore errors, just keep data if dates are weird)
            df["Timestamp_Parsed"] = pd.to_datetime(df["Timestamp"], errors='coerce')

            # Apply Start Date
            if start_date and str(start_date).strip():
                try:
                    start_dt = pd.to_datetime(start_date)
                    df = df[df["Timestamp_Parsed"] >= start_dt]
                except Exception as e:
                    print(f"Start date filter error: {e}")

            # Apply End Date (Add 23:59:59 to include the whole end day)
            if end_date and str(end_date).strip():
                try:
                    end_dt = pd.to_datetime(end_date).replace(hour=23, minute=59, second=59)
                    df = df[df["Timestamp_Parsed"] <= end_dt]
                except Exception as e:
                    print(f"End date filter error: {e}")

            # 4. Clean up and reverse order (Newest first!)
            df = df.drop(columns=["Timestamp_Parsed"])
            
            # Return the reversed dataframe so you don't have to scroll down
            return df.iloc[::-1].reset_index(drop=True)

        except Exception as e:
            import traceback
            print(f"❌ Error reading history: {e}")
            traceback.print_exc()
            return pd.DataFrame(columns=expected_cols)
    # --- SINGLE ENTRY SAVING ---
    def check_if_exists(self, utterance, dialect, brain_agent, clarification="", tone=""):
        if brain_agent.df.empty: return False
        
        clean_text = str(utterance).strip().lower()
        clean_dialect = str(dialect).strip()
        clean_clar = str(clarification).strip().lower()
        
        match = brain_agent.df[
            (brain_agent.df["Utterance"].astype(str).str.strip().str.lower() == clean_text) &
            (brain_agent.df["Dialect"].astype(str).str.strip() == clean_dialect) &
            (brain_agent.df["Clarification"].astype(str).str.strip().str.lower() == clean_clar)
        ]
        return not match.empty
    
    def process_feedback(self, action, original_text, dialect, clarification, tone, context, brain_agent, audio_path=None, pragmatics=""):
        timestamp = pd.Timestamp.now().isoformat()
        feedback_data = {
            "original": original_text, "dialect": dialect, "clarification": clarification,
            "tone": tone, "linguistic_context": context, "pragmatics": pragmatics, "action": action, "timestamp": timestamp
        }

        def _background_save_task():
            loop = asyncio.new_event_loop() # Create new loop
            asyncio.set_event_loop(loop) # Set as active loop

            self.active_tasks += 1
            try:
                # 🟢 Generate Acoustic Profile dynamically before saving
                acoustic_profile = "{}"
                if getattr(self, "acoustic_agent", None):
                    acoustic_profile = self.acoustic_agent.generate_phonetic_profile(original_text, dialect)

                feedback_data["acoustic_profile"] = acoustic_profile

                self.stamp_on_chain(feedback_data)
                if action in ["Suggest Update", "Accept", "Force Overwrite"]:
                    syntax = r"\b" + re.escape(original_text.lower()) + r"\b"
                    self.update_dataset_csv(dialect, original_text, clarification, tone, context, syntax, audio_path, pragmatics, acoustic_profile=acoustic_profile)
                    if brain_agent: brain_agent.refresh_knowledge_base()
            except Exception as e: print(f"❌ Background Task Error: {e}")
            finally: 
                self.active_tasks -= 1
                loop.close() # Cleanly close the loop

        threading.Thread(target=_background_save_task, daemon=True).start()
        return "✅ Request Queued!"
        
    def update_dataset_csv(self, dialect, utterance, clarification, tone, context, syntax, audio_path=None, pragmatics="", sourceTag="Web", clar_source="User", userKey="", acoustic_profile="{}"):
        import csv
        clean_dialect = dialect.strip().title()
        if not clean_dialect.endswith("English") and not clean_dialect.endswith("Dialect"): 
            clean_dialect += " English"
        
        filepath = os.path.join(self.config.DATASET_DIR, f"{clean_dialect}.csv")
        
        # 🟢 COLUMN FIX: Hardcode both columns to prevent schema crashes
        expected_cols = ["Utterance", "Dialect", "Clarification", "Tone_Category", "Linguistic_Context", "Syntax_Pattern", "Pragmatic_Analysis", "Acoustic_Profile", "file_name", "audio_file_name", "Data_Origin", "Clarification_Source", "User"]

        with self.lock:
            if not os.path.exists(filepath):
                df = pd.DataFrame(columns=expected_cols)
            else:
                try: 
                    df = pd.read_csv(filepath, encoding='utf-8-sig', on_bad_lines='skip')
                except: 
                    df = pd.DataFrame(columns=expected_cols)

            for col in expected_cols:
                if col not in df.columns:
                    df[col] = ""

            # 🟢 AUDIO FIX: Map to the standard 'file_name' column
            final_audio = ""
            if isinstance(audio_path, str) and os.path.exists(audio_path):
                audio_filename = os.path.basename(audio_path)
                final_audio = f"audio/{audio_filename}"

            row_data = {
                "Utterance": utterance, "Dialect": clean_dialect, "Clarification": clarification,
                "Tone_Category": tone, "Linguistic_Context": context, "Pragmatic_Analysis": pragmatics, 
                "Syntax_Pattern": syntax, 
                "Acoustic_Profile": acoustic_profile,
                "file_name": final_audio,          # ⬅️ Valid Audio Path goes here
                "audio_file_name": "",             # ⬅️ Blank to prevent confusion
                "Data_Origin": sourceTag,          # ⬅️ Will now say "Game: X" or "Gradio App"
                "Clarification_Source": clar_source, 
                "User": userKey                    # ⬅️ Will now say "Op: 0x... | Net-IP: 119..."
            }
            
            new_row = pd.DataFrame([{k: row_data.get(k, "") for k in expected_cols}])
            final_df = pd.concat([df, new_row], ignore_index=True)
            final_df.to_csv(filepath, index=False, quoting=csv.QUOTE_ALL)
            
            
            # ==========================================
            # ☁️ 4. HUGGING FACE CLOUD SYNC
            # ==========================================
            try:
                hf_token = os.environ.get("HF_TOKEN")
                # Fallback to your hardcoded ID if the config is missing it
                repo_id = getattr(self.config, "HF_REPO_ID", "toecm/IEDID") 
                
                if hf_token:
                    from huggingface_hub import HfApi
                    api = HfApi(token=hf_token)
                    
                    # 🎵 Upload the Audio File
                    if isinstance(audio_path, str) and os.path.exists(audio_path):
                        print(f"☁️ Syncing Audio to HF: {final_audio}")
                        api.upload_file(
                            path_or_fileobj=audio_path,
                            path_in_repo=final_audio,
                            repo_id=repo_id,
                            repo_type="dataset",
                            commit_message=f"🎙️ Added new audio sample for {clean_dialect}"
                        )
                    
                    # 📝 Upload the CSV file
                    if os.path.exists(filepath):
                        csv_filename = os.path.basename(filepath)
                        print(f"☁️ Syncing CSV to HF: {csv_filename}")
                        api.upload_file(
                            path_or_fileobj=filepath,
                            path_in_repo=csv_filename,
                            repo_id=repo_id,
                            repo_type="dataset",
                            commit_message=f"📝 Auto-update {clean_dialect} sociolinguistic data"
                        )
            except Exception as e:
                print(f"⚠️ Hugging Face Sync Error: {e}")
                # Optional Fallback: Use the old manager if the direct API fails
                if getattr(self, "hf_manager_ref", None): 
                    self.hf_manager_ref.push_update(filepath, f"Update: {utterance}")

        return True

    # ==========================================
    #            PURECHAIN HISTORY TAB
    # ==========================================
    def _log_transaction_history(self, payload, tx_hash, block_num):
        import pandas as pd
        import os
        from datetime import datetime
        from huggingface_hub import HfApi
        
        history_file = getattr(self, 'HISTORY_FILE', "/app/minted_history.csv")
        new_row = {
            "Timestamp": datetime.now().strftime("%Y-%m-%d %H:%M:%S"),
            "Utterance": payload.get("original", ""),
            "Dialect": payload.get("dialect", ""),
            "Data_Origin": payload.get("Data_Origin", "Unknown Origin"),
            "Data_Approved": f"Lab Approved: {self.account.address[:6]}...{self.account.address[-4:]}" if self.account else "Lab Approved",
            "Block": block_num,
            "TX Hash": tx_hash
        }
        try:
            if os.path.exists(history_file):
                df = pd.read_csv(history_file)
            else:
                df = pd.DataFrame(columns=new_row.keys())
            df = pd.concat([df, pd.DataFrame([new_row])], ignore_index=True)
            df.to_csv(history_file, index=False)
            
            # 🟢 FIX: Upload history back to Hugging Face so it survives restarts
            if self.config.HF_TOKEN:
                api = HfApi(token=self.config.HF_TOKEN)
                repo_id = getattr(self.config, 'HF_REPO_ID', "toecm/IEDID")
                api.upload_file(
                    path_or_fileobj=history_file,
                    path_in_repo="minted_history.csv",
                    repo_id=repo_id,
                    repo_type="dataset",
                    commit_message="⛓️ Logged PureChain transaction history"
                )
        except Exception as e: 
            print(f"History log error: {e}")



    # ==========================================
    #            SYSTEM BACKUP & DEPLOY
    # ==========================================
    def create_system_backup(self, filename, note):
        """Uploads a file to IPFS and logs it permanently to PureChain."""
        if not self.w3 or not self.account:
            return "❌ Node offline. Cannot create immutable backup."
            
        # Search for the file in your working directories
        filepath = os.path.join(self.config.DATASET_DIR, filename)
        if not os.path.exists(filepath):
            filepath = os.path.join(self.config.PROFILES_DIR, filename)
            
        if not os.path.exists(filepath):
            return f"❌ File '{filename}' not found in datasets or profiles."

        try:
            # 1. Upload to IPFS
            cid = self.upload_file_to_pinata(filepath)
            if not cid: return "❌ Failed to pin file to IPFS."

            # 2. Mint Backup to PureChain
            contract = self.w3.eth.contract(address=self.config.PURECHAIN_CONTRACT_ADDRESS, abi=self.config.CONTRACT_ABI)
            nonce = self.w3.eth.get_transaction_count(self.account.address, 'pending')
            
            # Using your contract's createBackup(string _key, string _type, string _cid, string _desc)
            file_ext = filename.split(".")[-1].upper()
            tx = contract.functions.createBackup(
                filename, file_ext, cid, note
            ).build_transaction({
                'from': self.account.address,
                'nonce': nonce,
                'gas': 2000000,
                'gasPrice': 0, # ZERO GAS!
                'chainId': self.config.PURECHAIN_ID
            })

            signed_tx = self.w3.eth.account.sign_transaction(tx, private_key=self.config.PRIVATE_KEY)
            tx_hash = self.w3.eth.send_raw_transaction(signed_tx.raw_transaction)
            self.w3.eth.wait_for_transaction_receipt(tx_hash)
            
            return f"✅ Immutable Backup Created!\nCID: {cid}\nTX: {self.w3.to_hex(tx_hash)}"
            
        except Exception as e:
            return f"❌ Blockchain Backup Error: {e}"

    def force_deploy_contract(self, bytecode):
        """Forces a raw bytecode deployment to PureChain with Zero Gas."""
        if not self.w3 or not self.account:
            return "❌ Node offline. Cannot deploy."
        
        if not bytecode or not bytecode.startswith("0x"):
            return "❌ Invalid bytecode. Must start with '0x'."

        try:
            nonce = self.w3.eth.get_transaction_count(self.account.address, 'pending')
            
            # Raw deployment transaction
            tx = {
                'from': self.account.address,
                'data': bytecode,
                'nonce': nonce,
                'gas': 4000000, # Higher gas limit for deployments
                'gasPrice': 0,  # ZERO GAS
                'chainId': self.config.PURECHAIN_ID
            }

            signed_tx = self.w3.eth.account.sign_transaction(tx, self.config.PRIVATE_KEY)
            tx_hash = self.w3.eth.send_raw_transaction(signed_tx.raw_transaction)
            receipt = self.w3.eth.wait_for_transaction_receipt(tx_hash)
            
            return f"✅ Contract Deployed Successfully!\nAddress: {receipt.contractAddress}"
            
        except Exception as e:
            return f"❌ Deployment Failed: {e}"

    def rebuild_history_from_chain(self):
        """Ultimate Failsafe: Reconstructs the CSV directly from the PureChain Ledger."""
        print("🌐 [TRUST AGENT] Rebuilding history from PureChain...")
        if not self.w3 or not self.w3.is_connected():
            print("❌ Cannot rebuild: Node offline.")
            return False

        try:
            contract = self.w3.eth.contract(
                address=self.config.PURECHAIN_CONTRACT_ADDRESS,
                abi=self.config.CONTRACT_ABI
            )
            # Make sure your except block aligns perfectly with your try block!
        except Exception as e:
            print(f"⚠️ Web3 Contract Error: {e}")
            contract = None