#!/usr/bin/env python3
"""
CouchDB to Filesystem Sync Daemon
Monitors CouchDB changes and writes updated files to disk in real-time.
"""
import couchdb
import os
import time
import json
from urllib.parse import quote
from pathlib import Path

# Configuration
USER = "admin"
PASSWORD = "DonCucarach0!?"
IP_ADDRESS = "100.100.112.48"
PORT = "5984"
DB_NAME = "obsidiandb"
TARGET_FOLDER = os.path.expanduser("~/ObsidianVault")  # Change this to your Obsidian vault path

class CouchDBSyncDaemon:
    def __init__(self, url, username, password, db_name, target_folder):
        self.url = url
        self.username = username
        self.password = password
        self.db_name = db_name
        self.target_folder = target_folder
        self.server = None
        self.db = None
        
    def connect(self):
        """Connect to CouchDB"""
        safe_password = quote(self.password, safe="")
        safe_username = quote(self.username, safe="")
        full_url = f"{self.url.split('://')[0]}://{safe_username}:{safe_password}@{self.url.split('://')[1]}"
        
        self.server = couchdb.Server(full_url)
        self.db = self.server[self.db_name]
        print(f"✅ Connected to CouchDB: {self.db_name}")
        
    def get_all_docs_dict(self):
        """Fetch all documents into a dictionary for efficient lookup"""
        all_docs = {}
        for row in self.db.view('_all_docs', include_docs=True):
            doc = row.doc
            if not doc['_id'].startswith("_design"):
                all_docs[doc['_id']] = doc
        return all_docs
        
    def write_file_to_disk(self, doc_id, all_docs):
        """Reconstruct and write a single file to disk"""
        doc = all_docs.get(doc_id)
        if not doc:
            print(f"⚠️  Document {doc_id} not found")
            return False
            
        # Check if this is a file metadata document
        if "children" not in doc or not isinstance(doc.get("children"), list):
            # This might be a chunk or other document type - skip
            return False
            
        relative_path = doc.get("path", doc_id)
        safe_path = relative_path.replace(":", "-").replace("|", "-")
        full_local_path = os.path.join(self.target_folder, safe_path)
        
        # Reconstruct content from chunks
        full_content = []
        is_encrypted = False
        
        for chunk_id in doc["children"]:
            chunk = all_docs.get(chunk_id)
            if not chunk:
                print(f"⚠️  Chunk {chunk_id} not found for {relative_path}")
                continue
                
            chunk_data = chunk.get("data") or chunk.get("content") or ""
            
            # Check if encrypted
            if str(chunk_data).startswith("%") or chunk.get("e_"):
                is_encrypted = True
                break
                
            full_content.append(str(chunk_data))
        
        if is_encrypted:
            print(f"🔒 Skipping encrypted file: {relative_path}")
            return False
        
        note_text = "".join(full_content)
        
        # Create parent directory if needed
        os.makedirs(os.path.dirname(full_local_path), exist_ok=True)
        
        # Write file
        with open(full_local_path, "w", encoding="utf-8") as f:
            f.write(note_text)
        
        print(f"📝 Wrote: {relative_path}")
        return True
        
    def handle_change(self, change, all_docs):
        """Handle a single change notification"""
        doc_id = change['id']
        is_deleted = change.get('deleted', False)
        
        if is_deleted:
            print(f"🗑️  Deleted: {doc_id}")
            # TODO: Could implement file deletion here
            return
            
        # Try to write the file
        self.write_file_to_disk(doc_id, all_docs)
        
    def initial_sync(self):
        """Perform initial full sync"""
        print("🔄 Starting initial sync...")
        all_docs = self.get_all_docs_dict()
        
        count = 0
        for doc_id, doc in all_docs.items():
            if "children" in doc and isinstance(doc.get("children"), list):
                if self.write_file_to_disk(doc_id, all_docs):
                    count += 1
                    if count % 10 == 0:
                        print(f"   Synced {count} files...")
        
        print(f"✅ Initial sync complete: {count} files")
        return count
        
    def watch_changes(self):
        """Watch for changes and sync in real-time"""
        print("👀 Watching for changes...")
        
        # Get current sequence
        since = self.db.info()['update_seq']
        
        while True:
            try:
                # Use longpoll to wait for changes
                changes = self.db.changes(since=since, feed='longpoll', timeout=30000, include_docs=True)
                since = changes['last_seq']
                
                if changes['results']:
                    # Fetch all docs for chunk lookup
                    all_docs = self.get_all_docs_dict()
                    
                    for change in changes['results']:
                        self.handle_change(change, all_docs)
                
                time.sleep(0.5)
                
            except KeyboardInterrupt:
                print("\n⛔ Stopping sync daemon...")
                break
            except Exception as e:
                print(f"❌ Error: {e}")
                print("   Retrying in 5 seconds...")
                time.sleep(5)
                try:
                    self.connect()  # Reconnect
                except Exception as reconnect_error:
                    print(f"❌ Reconnection failed: {reconnect_error}")

def main():
    # Ensure target folder exists
    os.makedirs(TARGET_FOLDER, exist_ok=True)
    
    print("=" * 60)
    print("CouchDB → Filesystem Sync Daemon")
    print("=" * 60)
    print(f"Database: {DB_NAME}")
    print(f"Target: {TARGET_FOLDER}")
    print("=" * 60)
    
    # Build URL
    url = f"http://{IP_ADDRESS}:{PORT}/"
    
    # Create daemon
    daemon = CouchDBSyncDaemon(url, USER, PASSWORD, DB_NAME, TARGET_FOLDER)
    
    # Connect
    daemon.connect()
    
    # Initial sync
    daemon.initial_sync()
    
    # Watch for changes
    daemon.watch_changes()

if __name__ == "__main__":
    main()