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import streamlit as st
from tantivy_search_agent import TantivySearchAgent
from agent_workflow import SearchAgent
import os
from typing import Optional, List
from dotenv import load_dotenv
import gdown

# Load environment variables
load_dotenv()

class SearchAgentUI:
    def __init__(self):
        self.tantivy_agent: Optional[TantivySearchAgent] = None
        self.agent: Optional[SearchAgent] = None
        self.index_path ="./index" # os.getenv("INDEX_PATH", "./index")
        # Google Drive folder ID for the index
        self.gdrive_index_id = os.getenv("GDRIVE_INDEX_ID", "1lpbBCPimwcNfC0VZOlQueA4SHNGIp5_t")

    def download_index_from_gdrive(self) -> bool:
        """Download index folder from Google Drive"""
        try:
            # Create a temporary zip file path
            zip_path = "index.zip"
            # Download the folder as a zip file
            url = f"https://drive.google.com/uc?id={self.gdrive_index_id}"
            
            # Create a progress bar and status text
            progress_text = st.empty()
            progress_bar = st.progress(0)
            
            def progress_callback(progress):
                progress_bar.progress(progress)
                progress_text.text(f"מוריד... {progress:.1f}%")
            
            # Download with progress callback
            gdown.download(url, zip_path, quiet=False, callback=progress_callback)
            
            # Update status for extraction
            progress_text.text("מחלץ קבצים...")
            progress_bar.progress(100)
            
            # Extract the zip file
            import zipfile
            with zipfile.ZipFile(zip_path, 'r') as zip_ref:
                zip_ref.extractall(".")
            
            # Remove the zip file
            os.remove(zip_path)
            
            # Clear the progress indicators
            progress_text.empty()
            progress_bar.empty()
            
            return True
        except Exception as e:
            st.error(f"Failed to download index: {str(e)}")
            return False

    def get_available_providers(self) -> List[str]:
        """Get available providers without creating a SearchAgent instance"""
        temp_tantivy = TantivySearchAgent(self.index_path)
        temp_agent = SearchAgent(temp_tantivy)
        return temp_agent.get_available_providers()

    def initialize_system(self):
        try:
            # Check if index folder exists
            if not os.path.exists(self.index_path):
                st.warning("Index folder not found. Attempting to download from Google Drive...")
                if not self.download_index_from_gdrive():
                    return False, "שגיאה: לא ניתן להוריד את האינדקס", []
                st.success("Index downloaded successfully!")

            self.tantivy_agent = TantivySearchAgent(self.index_path)
            if self.tantivy_agent.validate_index():
                available_providers = self.get_available_providers()
                self.agent = SearchAgent(
                    self.tantivy_agent,
                    provider_name=st.session_state.get('provider', available_providers[0])
                )
                return True, "המערכת מוכנה לחיפוש", available_providers
            else:
                return False, "שגיאה: אינדקס לא תקין", []
        except Exception as ex:
            return False, f"שגיאה באתחול המערכת: {str(ex)}", []

    def main(self):
        st.set_page_config(
            page_title="איתוריא",
            layout="wide",
            initial_sidebar_state="collapsed"
        )

        # Enhanced RTL support and styling
        st.markdown("""

        <style>

            .stApp {

                direction: rtl;

            }

            .stTextInput > div > div > input {

                direction: rtl;

            }

            .stSelectbox > div > div > div {

                direction: rtl;

            }

            .stNumberInput > div > div > input {

                direction: rtl;

            }

            .search-step {

                border: 1px solid #e0e0e0;

                border-radius: 5px;

                padding: 10px;

                margin: 5px 0;

                background-color: #f8f9fa;

            }

            .document-group {

                border: 1px solid #e3f2fd;

                border-radius: 5px;

                padding: 10px;

                margin: 5px 0;

                background-color: #f5f9ff;

            }

            .document-item {

                border: 1px solid #e0e0e0;

                border-radius: 5px;

                padding: 10px;

                margin: 5px 0;

                background-color: white;

            }

        </style>

        """, unsafe_allow_html=True)

        # Initialize system
        success, status_msg, available_providers = self.initialize_system()

        # Header layout
        col1, col2, col3 = st.columns([2,1,1])

        with col1:
            if success:
                st.success(status_msg)
            else:
                st.error(status_msg)

        with col2:
            if 'provider' not in st.session_state:
                st.session_state.provider = available_providers[0] if available_providers else None
            
            if available_providers:
                provider = st.selectbox(
                    "ספק בינה מלאכותית",
                    options=available_providers,
                    key='provider'
                )
                if self.agent:
                    self.agent.set_provider(provider)

        with col3:
            col3_1, col3_2 = st.columns(2)
            with col3_1:
                max_iterations = st.number_input(
                    "מספר נסיונות מקסימלי",
                    min_value=1,
                    value=3,
                    key='max_iterations'
                )
            with col3_2:
                results_per_search = st.number_input(
                    "תוצאות לכל חיפוש",
                    min_value=1,
                    value=5,
                    key='results_per_search'
                )

        # Search input
        query = st.text_input(
            "הכנס שאילתת חיפוש",
            disabled=not success,
            placeholder="הקלד את שאילתת החיפוש שלך כאן...",
            key='search_query'
        )

        # Search button
        if (st.button('חפש', disabled=not success) or query) and query!="" and self.agent:          
                try:
                    if 'steps' not in st.session_state:
                        st.session_state.steps = []
                    
                    steps_container = st.container()
                    answer_container = st.container()
                    sources_container = st.container()

                    with steps_container:
                        st.subheader("צעדי תהליך החיפוש")

                    def handle_step_update(step):
                        if 'final_result' in step:
                            final_result = step['final_result']
                            
                            with answer_container:
                                st.subheader("תשובה סופית")
                                st.info(final_result['answer'])

                            if final_result['sources']:
                                with sources_container:
                                    st.subheader("מסמכי מקור")
                                    st.markdown(f"נמצאו {len(final_result['sources'])} תוצאות")
                                    
                                    for i, source in enumerate(final_result['sources']):
                                        with st.expander(f"תוצאה {i+1}: {source['reference']} (ציון: {source['score']:.2f})"):
                                            st.write(source['text'])
 
                        else:
                            with steps_container:
                                step_number = len(st.session_state.steps) + 1
                                st.markdown(f"""

                                <div class='search-step'>

                                    <strong>צעד {step_number}. {step['action']}</strong>

                                </div>

                                """, unsafe_allow_html=True)
                                st.markdown(f"**{step['description']}**")
                                
                                if 'results' in step:
                                    documents = []
                                    
                                    for r in step['results']:
                                        if r['type'] == 'query':
                                            st.markdown("**שאילתת חיפוש:**")
                                            st.code(r['content'])
                                        
                                        elif r['type'] == 'document':
                                            documents.append(r['content'])
                                        
                                        elif r['type'] == 'evaluation':
                                            content = r['content']
                                            status = "✓" if content['status'] == 'accepted' else "↻"
                                            confidence = f"ביטחון: {content['confidence']}"
                                            if content['status'] == 'accepted':
                                                st.success(f"{status} {confidence}")
                                            else:
                                                st.warning(f"{status} {confidence}")
                                            if content['explanation']:
                                                st.info(content['explanation'])
                                        
                                        elif r['type'] == 'new_query':
                                            st.markdown("**ניסיון הבא:**")
                                            st.code(r['content'])
                                    
                                    # Display documents if any were found
                                    if documents:
                                        for i, doc in enumerate(documents):
                                            with st.expander(f"{doc['reference']} (ציון: {doc['score']:.2f})"):
                                                st.write(doc['highlights'][0])
                                    
                                st.markdown("---")
                            st.session_state.steps.append(step)

                    # Clear previous steps before starting new search
                    st.session_state.steps = []
                    
                    # Start the search process
                    self.agent.search_and_answer(
                        query=query,
                        num_results=results_per_search,
                        max_iterations=max_iterations,
                        on_step=handle_step_update
                    )

                except Exception as ex:
                    st.error(f"שגיאת חיפוש: {str(ex)}")

if __name__ == "__main__":
    app = SearchAgentUI()
    app.main()