import os
import json
from datetime import datetime
from typing import List, Dict, Any

class SimpleDB:
    def __init__(self, db_path: str = "./data/documents.json"):
        """Initialize a simple JSON-based document store"""
        self.db_path = db_path
        os.makedirs(os.path.dirname(db_path), exist_ok=True)
        
        # Create the DB file if it doesn't exist
        if not os.path.exists(db_path):
            with open(db_path, 'w') as f:
                json.dump({"documents": [], "queries": []}, f)
    
    def _read_db(self):
        """Read the database file"""
        with open(self.db_path, 'r') as f:
            return json.load(f)
    
    def _write_db(self, data):
        """Write to the database file"""
        with open(self.db_path, 'w') as f:
            json.dump(data, f, indent=2)
    
    def add_document(self, filename: str, file_path: str, file_type: str):
        """Add a document to the database"""
        db = self._read_db()
        
        # Generating a simple ID
        doc_id = len(db["documents"]) + 1
        
        # Add document
        db["documents"].append({
            "id": doc_id,
            "filename": filename,
            "file_path": file_path,
            "file_type": file_type,
            "upload_date": str(datetime.now())
        })
        
        self._write_db(db)
        return doc_id
    
    def get_document(self, doc_id: int):
        """Get document by ID"""
        db = self._read_db()
        for doc in db["documents"]:
            if doc["id"] == doc_id:
                return doc
        return None
    
    def get_all_documents(self):
        """Get all documents"""
        db = self._read_db()
        return db["documents"]
    
    def log_query(self, query_text: str, response: str = None):
        """Log a user query and its response"""
        db = self._read_db()
        
        # Generating a simple ID
        query_id = len(db["queries"]) + 1
        
        # Adding query
        db["queries"].append({
            "id": query_id,
            "query_text": query_text,
            "response": response,
            "timestamp": str(datetime.now())
        })
        
        self._write_db(db)
        return query_id