app.py

import os
import sys
import gradio as gr
from dotenv import load_dotenv
import tempfile
import pandas as pd
import sqlite3
from langchain_core.prompts import ChatPromptTemplate
from langchain_groq import ChatGroq
import plotly.express as px
import time
import plotly.io as pio
import traceback
import base64
from io import BytesIO
# I am commenting out voice libraries because we are not using them right now
# import speech_recognition as sr
# from gtts import gTTS
import re
import importlib.util

# Load environment variables
load_dotenv()

# Add parent directory to path to import backend modules
sys.path.append(os.path.dirname(os.path.dirname(os.path.abspath(__file__))))

from backend.main import DocumentAssistant

# Initialize the document assistant
document_assistant = DocumentAssistant()

# Initialize the LLM using the llama3-8b-8192 model from Groq
llm = ChatGroq(
    model="llama3-8b-8192",
    temperature=0,
    max_tokens=None,
    timeout=None,
    max_retries=2,
    verbose=True,
    api_key=os.getenv("GROQ_API_KEY")
)

# Database path for CSV data
DB_PATH = os.path.join(os.path.dirname(os.path.abspath(__file__)), "data", "csv_data.db")
os.makedirs(os.path.dirname(DB_PATH), exist_ok=True)

# Current context to track what we're working with
current_context = {
    "file_type": None,
    "file_name": None,
    "table_name": None
}

# Add a global variable to store the current plot
current_plot = None

# Define the prompt with examples for SQL query generation
query_prompt = ChatPromptTemplate.from_template("""
You are a SQL expert. Given a question about data in a table, write a SQLite-compatible SQL query to answer the question.

Important guidelines:
1. Use SQLite syntax (not PostgreSQL or MySQL)
2. For date functions, use strftime() instead of EXTRACT
   - Example: strftime('%Y', date_column) instead of EXTRACT(YEAR FROM date_column)
3. SQLite doesn't have TRUNCATE function, use CAST((column / bin_size) AS INT) * bin_size instead
4. For percentiles, use window functions or approximate methods
5. Keep queries efficient and focused on answering the specific question
6. Always use 'data_tab' as the table name
7. IMPORTANT: Return ONLY the SQL query without any markdown formatting, explanations, or code blocks

Question: {question}
""")

# Define the prompt for interpreting the SQL query result
interpret_prompt = ChatPromptTemplate.from_messages(
    [
        ("system", "You are an experienced data analyst. Provide a concise, natural language answer based on the given data summary. If relevant, give key statistics, trends, or patterns."),
        ("human", "Question: {question}\nSQL Query: {sql_query}\nData Summary:\n{data_summary}")
    ]
)

# Add this after the query_prompt definition
visualization_prompt = ChatPromptTemplate.from_template("""
You are a data visualization expert. Given a question about visualizing data, write a SQLite-compatible SQL query that will retrieve the appropriate data for the visualization.

Important guidelines for SQLite syntax:
1. Use strftime() for date functions:
   - Year: strftime('%Y', date_column)
   - Month: strftime('%m', date_column)
   - Day: strftime('%d', date_column)
   - Hour: strftime('%H', date_column)

2. For histograms and binning:
   - Use: CAST((column / bin_size) AS INT) * bin_size
   - Example: CAST((trip_distance / 0.5) AS INT) * 0.5 AS distance_bin

3. For box plots:
   - SQLite doesn't support PERCENTILE_CONT or window functions
   - Simply return the raw data column: SELECT column_name FROM data_tab
   - The application will calculate quartiles and outliers

4. For heatmaps:
   - Return raw data for correlation analysis
   - Example: SELECT numeric_col1, numeric_col2, numeric_col3 FROM data_tab

5. Always use 'data_tab' as the table name

6. IMPORTANT: Return ONLY the SQL query without any markdown formatting, explanations, or code blocks

Question: {question}
Visualization type: {viz_type}
""")

# Add this helper function to clean SQL queries
def clean_sql_query(query_text):
    """Clean SQL query text by removing markdown formatting and comments"""
    # Check if input is None or empty
    if not query_text:
        return "SELECT * FROM data_tab LIMIT 10;"
    
    # Remove markdown code blocks
    if "```" in query_text:
        # Extract content between code blocks
        pattern = r"```(?:sql)?(.*?)```"
        matches = re.findall(pattern, query_text, re.DOTALL)
        if matches:
            query_text = matches[0].strip()
    
    # Remove any "Here is the SQL query" text that might precede the query
    prefixes = [
        "here is the sql query",
        "here is the sqlite query",
        "here is a query",
        "here's the sql query",
        "the sql query is",
        "sql query:"
    ]
    
    for prefix in prefixes:
        if query_text.lower().startswith(prefix):
            # Find the first occurrence of "SELECT", "WITH", etc.
            sql_keywords = ["select", "with", "create", "insert", "update", "delete"]
            positions = [query_text.lower().find(keyword) for keyword in sql_keywords]
            positions = [pos for pos in positions if pos != -1]
            
            if positions:
                start_pos = min(positions)
                query_text = query_text[start_pos:]
    
    # Remove SQL comments
    query_text = re.sub(r'--.*?(\n|$)', ' ', query_text)
    
    # Remove trailing semicolon if present
    query_text = query_text.strip().rstrip(';')
    
    # Ensure the query is not empty
    if not query_text.strip():
        return "SELECT * FROM data_tab LIMIT 10;"
    
    return query_text

def process_text_query(query, history):
    """Process a text query and update chat history"""
    if not query:
        return "", history
    
    # Add the user's query to history
    history.append({"role": "user", "content": query})
    
    start_time = time.time()
    
    # Define visualization keywords at the beginning
    viz_keywords = {
        'bar': ['bar chart', 'bar graph', 'bar plot', 'barchart', 'bargraph'],
        'line': ['line chart', 'line graph', 'line plot', 'linechart', 'trend', 'trends', 'time series'],
        'pie': ['pie chart', 'pie graph', 'pie plot', 'piechart', 'distribution', 'proportion'],
        'histogram': ['histogram', 'distribution of', 'frequency distribution'],
        'box': ['box plot', 'boxplot', 'box and whisker', 'outliers', 'quartiles'],
        'heatmap': ['heatmap', 'heat map', 'correlation matrix', 'correlation heatmap'],
        'scatter': ['scatter', 'scatter plot', 'relationship between', 'correlation between']
    }
    
    # Check if this is a visualization request
    is_visualization = any(word in query.lower() for word in ['plot', 'graph', 'chart', 'visualize', 'visualization', 'trend', 'show me'])
    
    # Determine visualization type from query
    viz_type = None
    if is_visualization:
        for vtype, keywords in viz_keywords.items():
            if any(keyword in query.lower() for keyword in keywords):
                viz_type = vtype
                break
    
    # Check if we're in CSV context
    if current_context["file_type"] == "csv" and current_context["table_name"]:
        try:
            # Connect to the database
            conn = sqlite3.connect(DB_PATH)
            
            # Get column information for context
            cursor = conn.cursor()
            cursor.execute(f"PRAGMA table_info({current_context['table_name']});")
            columns = [info[1] for info in cursor.fetchall()]
            columns_str = ", ".join(columns)
            
            # Create question with context
            question_with_context = f"The table 'data_tab' has columns: {columns_str}. {query}"
            
            # Special handling for visualization types that need raw data
            if is_visualization and viz_type in ['box', 'heatmap']:
                # For box plots and heatmaps, we need raw data
                if viz_type == 'box':
                    # For box plots, we need a single numeric column
                    numeric_cols_query = "SELECT name FROM pragma_table_info('data_tab') WHERE type LIKE '%INT%' OR type LIKE '%REAL%' OR type LIKE '%FLOA%' OR type LIKE '%NUM%';"
                    cursor = conn.cursor()
                    cursor.execute(numeric_cols_query)
                    numeric_cols = [row[0] for row in cursor.fetchall()]
                    
                    if numeric_cols:
                        # Find the relevant numeric column based on the query
                        target_col = None
                        for col in numeric_cols:
                            if col.lower() in query.lower():
                                target_col = col
                                break
                        
                        # If no specific column is mentioned, use the first numeric column
                        if not target_col and numeric_cols:
                            target_col = numeric_cols[0]
                        
                        # Generate a simple query to get the raw data
                        sql_query = f"SELECT {target_col} FROM data_tab WHERE {target_col} IS NOT NULL;"
                    else:
                        # No numeric columns found
                        sql_query = "SELECT * FROM data_tab LIMIT 10;"
                
                elif viz_type == 'heatmap':
                    # For heatmaps, we need multiple numeric columns
                    numeric_cols_query = "SELECT name FROM pragma_table_info('data_tab') WHERE type LIKE '%INT%' OR type LIKE '%REAL%' OR type LIKE '%FLOA%' OR type LIKE '%NUM%';"
                    cursor = conn.cursor()
                    cursor.execute(numeric_cols_query)
                    numeric_cols = [row[0] for row in cursor.fetchall()]
                    
                    if len(numeric_cols) >= 2:
                        # Use all numeric columns (up to a reasonable limit)
                        cols_to_use = numeric_cols[:10]  # Limit to 10 columns for performance
                        cols_str = ", ".join(cols_to_use)
                        sql_query = f"SELECT {cols_str} FROM data_tab WHERE {numeric_cols[0]} IS NOT NULL LIMIT 1000;"
                    else:
                        # Not enough numeric columns
                        sql_query = "SELECT * FROM data_tab LIMIT 10;"
            else:
                # Generate SQL query using LLM
                ai_msg = query_prompt | llm
                raw_sql_query = ai_msg.invoke({"question": question_with_context}).content.strip()
                
                # Clean the SQL query
                sql_query = clean_sql_query(raw_sql_query)
            
            print(f"Generated SQL Query: {sql_query}")
            
            try:
                # Execute the query
                result_df = pd.read_sql_query(sql_query, conn)
                
                # Generate data summary
                if not result_df.empty:
                    data_summary = result_df.describe(include='all').to_string()
                    
                    # For small result sets, include the actual data
                    if len(result_df) <= 10:
                        data_summary += f"\n\nFull Results:\n{result_df.to_string()}"
                    else:
                        data_summary += f"\n\nFirst 5 rows:\n{result_df.head(5).to_string()}"
                else:
                    data_summary = "No relevant data found."
                
                # Generate interpretation
                answer_chain = interpret_prompt | llm
                interpretation = answer_chain.invoke({
                    "question": query,
                    "sql_query": sql_query,
                    "data_summary": data_summary
                }).content.strip()
                
                # Create the response
                response = f"**SQL Query:**\n```sql\n{sql_query}\n```\n\n"
                
                if not result_df.empty:
                    if len(result_df) > 10:
                        response += f"**Results (first 5 of {len(result_df)} rows):**\n```\n{result_df.head(5).to_string()}\n```\n\n"
                    else:
                        response += f"**Results:**\n```\n{result_df.to_string()}\n```\n\n"
                else:
                    response += "**No results found.**\n\n"
                
                response += f"**Analysis:**\n{interpretation}"
                
                # Add visualization if requested
                if is_visualization and not result_df.empty:
                    try:
                        # Generate visualization
                        viz_html = generate_visualization(result_df, query)
                        
                        if viz_html:
                            # Add the visualization to the response
                            response += f"\n\n{viz_html}"
                            
                            # Add note about visualization
                            response += "\n\n**A visualization has been generated and is displayed above.**"
                        else:
                            response += "\n\n**Could not generate visualization due to an error.**"
                        
                    except Exception as viz_error:
                        print(f"Visualization error: {str(viz_error)}")
                        import traceback
                        traceback.print_exc()
            
            except Exception as e:
                response = f"**SQL Query:**\n```sql\n{sql_query}\n```\n\n**Error executing query:** {str(e)}"
            
            conn.close()
            
        except Exception as e:
            response = f"Error processing query: {str(e)}"
    
    else:
        # For non-CSV queries, use the document assistant
        try:
            response = document_assistant.process_query(query)
        except Exception as e:
            response = f"Error processing document query: {str(e)}"
    
    # Calculate processing time
    processing_time = time.time() - start_time
    response += f"\n\n(Query processed in {processing_time:.2f} seconds)"
    
    # Add the response to history
    history.append({"role": "assistant", "content": response})
    
    return "", history

def process_file_upload(files):
    """Process uploaded files and index them"""
    if not files:
        return "No files uploaded"
    
    global current_context
    
    # Clear existing context
    current_context = {
        "file_type": None,
        "file_name": None,
        "table_name": None
    }
    
    file_info = []
    for file in files:
        file_path = file.name
        file_name = os.path.basename(file_path)
        file_ext = os.path.splitext(file_name)[1].lower()
        
        if file_ext == '.csv':
            try:
                # Create table name from filename
                table_name = os.path.splitext(file_name)[0].replace(' ', '_').lower()
                
                # Load CSV into SQLite
                conn = sqlite3.connect(DB_PATH)
                
                # Configure SQLite for faster imports
                conn.execute("PRAGMA synchronous = OFF")
                conn.execute("PRAGMA journal_mode = MEMORY")
                
                # Read the CSV and load it into SQLite
                df = pd.read_csv(file_path)
                df.to_sql('data_tab', conn, if_exists='replace', index=False)
                
                # Update current context
                current_context = {
                    "file_type": "csv",
                    "file_name": file_name,
                    "table_name": "data_tab"  # Always use data_tab as the table name
                }
                
                # Get column info
                cursor = conn.cursor()
                cursor.execute("PRAGMA table_info(data_tab);")
                columns = [f"{col[1]} ({col[2]})" for col in cursor.fetchall()]
                
                # Get row count
                cursor.execute("SELECT COUNT(*) FROM data_tab;")
                row_count = cursor.fetchone()[0]
                
                conn.close()
                
                file_info.append("✅ CSV File Successfully Loaded")
                file_info.append(f"📊 Table Name: data_tab")
                file_info.append(f"📄 Source File: {file_name}")
                file_info.append(f"📈 Total Rows: {row_count:,}")
                file_info.append(f"📋 Columns: {', '.join(columns)}")
                
            except Exception as e:
                file_info.append(f"❌ Error loading CSV {file_name}: {str(e)}")
        
        else:
            # Process PDF or other document types
            try:
                result = document_assistant.upload_document(file_path)
                
                # Update current context
                current_context = {
                    "file_type": "pdf",
                    "file_name": file_name,
                    "table_name": None
                }
                
                file_info.append("✅ Document Successfully Processed")
                file_info.append(f"📄 File: {file_name}")
                file_info.append(f"📚 Chunks: {result['chunks']}")
                file_info.append(result['message'])
            except Exception as e:
                file_info.append(f"❌ Error processing document {file_name}: {str(e)}")
    
    return "\n".join(file_info)

def list_documents():
    """List all indexed documents"""
    try:
        docs = document_assistant.get_all_documents()
        if not docs:
            return "No documents indexed yet."
        
        result = "Indexed Documents:\n\n"
        for doc in docs:
            result += f"- {doc['filename']} ({doc['file_type']})\n"
        
        return result
    except Exception as e:
        return f"Error listing documents: {str(e)}"

def clear_context():
    """Clear the current context"""
    global current_context
    
    try:
        # Reset the context
        current_context = {
            "file_type": None,
            "file_name": None,
            "table_name": None
        }
        
        return [{"role": "assistant", "content": "Context cleared. You can now upload new documents or CSV files."}]
    except Exception as e:
        return [{"role": "assistant", "content": f"Error clearing context: {str(e)}"}]

# I am making a function for voice input but we are not using it in this version(still in development phase)
"""
def process_voice_input(audio_path):
    # I am checking if there is audio
    if audio_path is None:
        return "No audio recorded"
    
    try:
        # I am making a recognizer for the voice
        r = sr.Recognizer()
        
        # I am loading the audio file
        with sr.AudioFile(audio_path) as source:
            # I am reading the audio data
            audio_data = r.record(source)
            
            # I am recognizing speech using Google
            text = r.recognize_google(audio_data)
            
            return text
    except sr.UnknownValueError:
        return "Could not understand audio"
    except sr.RequestError as e:
        return f"Error with speech recognition service: {e}"
    except Exception as e:
        return f"Error processing audio: {str(e)}"
"""

#  a function for text to speech 
"""
def text_to_speech_output(text):
    # I am checking if there is text
    if not text or len(text) == 0:
        return None
    
    # I am finding the last message from assistant
    last_message = None
    for msg in reversed(text):
        if msg["role"] == "assistant":
            last_message = msg["content"]
            break
    
    if not last_message:
        return None
    
    try:
        # I am cleaning the text
        clean_text = re.sub(r'<.*?>', '', last_message)  # I am removing HTML tags
        clean_text = re.sub(r'\*\*(.*?)\*\*', r'\1', clean_text)  # I am removing bold markdown
        clean_text = re.sub(r'\n\n', ' ', clean_text)  # I am replacing double newlines with space
        clean_text = re.sub(r'```.*?```', 'Code block removed for speech.', clean_text, flags=re.DOTALL)  # I am replacing code blocks
        
        # I am creating a temporary file
        temp_file = tempfile.NamedTemporaryFile(delete=False, suffix=".mp3")
        temp_file.close()
        
        # I am generating speech
        tts = gTTS(text=clean_text, lang='en', slow=False)
        tts.save(temp_file.name)
        
        return temp_file.name
    except Exception as e:
        print(f"Error generating speech: {str(e)}")
        return None
"""

def create_test_visualization():
    """Create a test visualization to verify plotting works"""
    try:
        # Create sample data
        data = pd.DataFrame({
            'Month': ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun'],
            'Value': [10, 15, 13, 17, 20, 25]
        })
        
        # Create a simple bar chart
        fig = px.bar(data, x='Month', y='Value', title='Test Visualization')
        
        # Configure the figure
        fig.update_layout(
            autosize=True,
            width=800,
            height=500
        )
        
        return fig
    except Exception as e:
        print(f"Error creating test visualization: {str(e)}")
        return None

def create_test_html_visualization():
    """Create a test HTML visualization to verify plotting works"""
    try:
        # Create sample data
        data = pd.DataFrame({
            'Month': ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun'],
            'Value': [10, 15, 13, 17, 20, 25]
        })
        
        # Create a simple bar chart
        fig = px.bar(data, x='Month', y='Value', title='Test Visualization')
        
        # Convert to HTML
        html = pio.to_html(fig, full_html=False)
        
        return html
    except Exception as e:
        print(f"Error creating test HTML visualization: {str(e)}")
        return None

def flush_databases():
    """Flush ChromaDB and SQLite databases"""
    global document_assistant
    global current_context
    result = []
    
    # Flush SQLite database
    try:
        conn = sqlite3.connect(DB_PATH)
        cursor = conn.cursor()
        
        # Get all tables
        cursor.execute("SELECT name FROM sqlite_master WHERE type='table';")
        tables = cursor.fetchall()
        
        # Drop all tables
        for table in tables:
            cursor.execute(f"DROP TABLE IF EXISTS {table[0]};")
        
        conn.commit()
        conn.close()
        
        result.append("✅ SQLite database cleared successfully")
    except Exception as e:
        result.append(f"❌ Error clearing SQLite database: {str(e)}")
    
    # Flush ChromaDB by resetting the document assistant
    try:
        success = document_assistant.reset_database()
        if success:
            result.append("✅ ChromaDB cleared successfully")
        else:
            # Even if reset fails, we can still reinitialize the document assistant
            # This is a workaround that creates a fresh instance
            document_assistant = DocumentAssistant()
            result.append("⚠️ ChromaDB reset partially completed - created new instance")
    except Exception as e:
        result.append(f"❌ Error clearing ChromaDB: {str(e)}")
    
    # Reset current context
    current_context = {
        "file_type": None,
        "file_name": None,
        "table_name": None
    }
    
    return "\n".join(result)

# At the beginning of app.py, after the imports
# Add this code to monkey patch the vector_db module
try:
    from backend.vector_db import ChromaVectorDB
except NameError as e:
    if "response" in str(e):
        # If the error is about 'response' not being defined, fix the module
        import backend.vector_db
        
        # Remove the problematic code
        if hasattr(backend.vector_db, 'response'):
            delattr(backend.vector_db, 'response')
        
        # Reload the module
        importlib.reload(backend.vector_db)
        from backend.vector_db import ChromaVectorDB

# Add this function to app.py
def generate_visualization(result_df, query):
    """Generate a visualization based on the query and data"""
    try:
        print("Visualization requested, attempting to create plot...")
        
        # Set common figure parameters
        fig_width = 900  # Adjusted for a more square shape
        fig_height = 800  # Increased to make it more square
        
        # Determine visualization type from query
        viz_type = 'bar'  # Default
        
        if any(word in query.lower() for word in ['pie', 'distribution', 'proportion']):
            viz_type = 'pie'
        elif any(word in query.lower() for word in ['line', 'trend', 'time series']):
            viz_type = 'line'
        elif any(word in query.lower() for word in ['scatter', 'relationship']):
            viz_type = 'scatter'
        elif any(word in query.lower() for word in ['histogram', 'distribution of']):
            viz_type = 'histogram'
        elif any(word in query.lower() for word in ['box', 'boxplot', 'outliers']):
            viz_type = 'box'
        elif any(word in query.lower() for word in ['heatmap', 'correlation']):
            viz_type = 'heatmap'
        
        print(f"Creating {viz_type} visualization...")
        
        # Find numeric columns
        numeric_cols = result_df.select_dtypes(include=['number']).columns.tolist()
        
        # Create basic visualization based on type
        if viz_type == 'pie' and len(result_df) <= 20:
            # Simple pie chart
            labels = result_df.iloc[:, 0].tolist()
            values = result_df.iloc[:, 1].tolist() if len(result_df.columns) > 1 else [1] * len(result_df)
            
            import plotly.graph_objects as go
            fig = go.Figure(data=[go.Pie(labels=labels, values=values)])
            fig.update_layout(title_text='Pie Chart')
            
        elif viz_type == 'histogram' and len(numeric_cols) > 0:
            # Simple histogram
            import plotly.express as px
            fig = px.histogram(result_df, x=numeric_cols[0])
            fig.update_layout(title_text=f'Histogram of {numeric_cols[0]}')
            
        elif viz_type == 'box' and len(numeric_cols) > 0:
            # Simple box plot
            import plotly.express as px
            fig = px.box(result_df, y=numeric_cols[0])
            fig.update_layout(title_text=f'Box Plot of {numeric_cols[0]}')
            
        elif viz_type == 'heatmap' and len(numeric_cols) >= 2:
            # Simple heatmap
            import plotly.express as px
            # Create correlation matrix
            corr_df = result_df[numeric_cols].corr()
            fig = px.imshow(corr_df, text_auto=True)
            fig.update_layout(title_text='Correlation Heatmap')
            
        elif viz_type == 'scatter' and len(numeric_cols) >= 2:
            # Simple scatter plot
            import plotly.express as px
            fig = px.scatter(result_df, x=numeric_cols[0], y=numeric_cols[1])
            fig.update_layout(title_text=f'Scatter Plot of {numeric_cols[0]} vs {numeric_cols[1]}')
            
        elif viz_type == 'line':
            # Simple line chart
            import plotly.express as px
            x_col = result_df.columns[0]
            y_cols = numeric_cols if numeric_cols else [result_df.columns[1]] if len(result_df.columns) > 1 else None
            
            if y_cols:
                fig = px.line(result_df, x=x_col, y=y_cols[0])
                fig.update_layout(
                    title_text=f'Line Chart of {y_cols[0]} over {x_col}',
                    xaxis=dict(
                        tickangle=-45,
                        tickmode='auto',
                        nticks=20
                    )
                )
            else:
                # Fallback to bar chart
                viz_type = 'bar'
                
        if viz_type == 'bar' or 'fig' not in locals():
            # Simple bar chart (default)
            import plotly.express as px
            x_col = result_df.columns[0]
            y_col = numeric_cols[0] if numeric_cols else result_df.columns[1] if len(result_df.columns) > 1 else None
            
            # Check if we have many categories (more than 10)
            if len(result_df) > 10:
                # Use horizontal bar chart for many categories
                if y_col:
                    fig = px.bar(
                        result_df, 
                        y=x_col,  # Swap x and y for horizontal orientation
                        x=y_col,
                        orientation='h',  # Horizontal orientation
                        title=f'Bar Chart of {y_col} by {x_col}'
                    )
                else:
                    fig = px.bar(
                        result_df,
                        y=x_col,  # Swap x and y for horizontal orientation
                        orientation='h',  # Horizontal orientation
                        title=f'Bar Chart of {x_col}'
                    )
            else:
                # Use vertical bar chart for fewer categories
                if y_col:
                    fig = px.bar(
                        result_df,
                        x=x_col,
                        y=y_col,
                        title=f'Bar Chart of {y_col} by {x_col}',
                        width=900,
                        height=800
                    )
                else:
                    fig = px.bar(
                        result_df,
                        x=x_col,
                        title=f'Bar Chart of {x_col}',
                        width=900,
                        height=800
                    )
            
            # Improve bar chart layout
            fig.update_layout(
                bargap=0.2,  # Increase gap between bars
                uniformtext_minsize=8,  # Minimum text size
                uniformtext_mode='hide'  # Hide text if it doesn't fit
            )
        
        # Set common layout properties
        fig.update_layout(
            width=fig_width,
            height=fig_height,
            template="plotly_white",
            margin=dict(l=40, r=40, t=80, b=80, pad=4),  # Balanced margins
            autosize=True,  # Allow the plot to resize with the container
            plot_bgcolor='rgba(240,240,240,0.2)',  # Light gray background
            paper_bgcolor='white'
        )
        
        print(f"Created figure with width={fig_width}, height={fig_height}")
        
        # Convert to image
        print("Converting figure to image...")
        img_bytes = pio.to_image(fig, format="png", width=fig_width, height=fig_height, scale=2)
        print("Image conversion successful")
        
        # Encode as base64
        import base64
        encoded = base64.b64encode(img_bytes).decode("ascii")
        img_src = f"data:image/png;base64,{encoded}"
        
        print("HTML conversion successful")
        
        # Return the HTML img tag
        return f"<img src='{img_src}' width='100%' style='max-width:900px; height:800px; object-fit:contain; display:block; margin:0 auto;' />"
        
    except Exception as e:
        import traceback
        print(f"Error generating visualization: {str(e)}")
        traceback.print_exc()
        return None

# Create Gradio interface
with gr.Blocks(title="LLM Powered Database Chatbot") as demo:
    gr.Markdown("# 🤖 LLM Powered Database Chatbot")
    gr.Markdown("Upload documents, ask questions, and get AI-powered responses!")
    
    with gr.Tab("Chat"):
        # Use a custom CSS to ensure images are displayed properly
        gr.HTML("""
        <style>
        .chatbot-container img {
            max-width: 100%;
            height: auto;
            display: block;
            margin: 10px 0;
        }
        </style>
        """)
        
        chatbot = gr.Chatbot(height=500, type="messages", elem_classes="chatbot-container")
        
        # Add information about capabilities
        gr.Markdown("""
        ### Capabilities:
        - **Data Analysis**: Ask questions about your data and get detailed responses
        - **Visualization**: Request and view graphs and charts of your data
        - **Multiple File Types**: Upload PDFs, TXT, DOCX, CSV, and XLSX files for analysis
        - **Natural Language Queries**: Ask questions in plain English about your documents
        """)
        
        with gr.Row():
            with gr.Column(scale=8):
                msg = gr.Textbox(
                    placeholder="Ask a question about your documents...",
                    show_label=False
                )
            with gr.Column(scale=1):
                # I am commenting out the voice button because we are not using it
                # voice_btn = gr.Button("🎤")
                pass  # I am using pass so the code still works
        
        with gr.Row():
            submit_btn = gr.Button("Submit")
            clear_btn = gr.Button("Clear")
            clear_context_btn = gr.Button("Clear Context")
        
        # I am commenting out audio output because we are not using it
        # audio_output = gr.Audio(label="Voice Response", type="filepath")
        
        # I am commenting out voice input because we are not using it
        """
        voice_input = gr.Audio(
            label="Voice Input", 
            type="filepath",
            visible=False
        )
        """
        
        # Event handlers
        submit_btn.click(
            process_text_query, 
            inputs=[msg, chatbot], 
            outputs=[msg, chatbot]
        )
        
        msg.submit(
            process_text_query, 
            inputs=[msg, chatbot], 
            outputs=[msg, chatbot]
        )
        
        clear_btn.click(lambda: None, None, [chatbot], queue=False)
        clear_context_btn.click(clear_context, inputs=[], outputs=[chatbot])
        
        # I am commenting out voice button click because it is still in development phase
        """
        voice_btn.click(
            lambda: gr.update(visible=True),
            None,
            voice_input
        )
        """
        
        # I am commenting out voice input change because it is still in development phase
        """
        voice_input.change(
            process_voice_input,
            inputs=[voice_input],
            outputs=[msg]
        )
        """
        
        # I am commenting out TTS button because it is still in development phase
        """
        tts_btn = gr.Button("🔊 Speak Response")
        tts_btn.click(
            text_to_speech_output,
            inputs=[chatbot],
            outputs=[audio_output]
        )
        """
    
    with gr.Tab("Document Upload"):
        file_upload = gr.File(
            label="Upload Documents",
            file_types=[".pdf", ".txt", ".docx", ".csv", ".xlsx"],
            file_count="multiple"
        )
        
        with gr.Row():
            upload_button = gr.Button("Process & Index Documents", scale=2)
            flush_db_btn_doc = gr.Button("🗑️ Flush All Databases", variant="stop", scale=1)
        
        upload_output = gr.Textbox(label="Upload Status")
        
        upload_button.click(
            process_file_upload,
            inputs=[file_upload],
            outputs=[upload_output]
        )
        
        flush_db_btn_doc.click(
            flush_databases,
            inputs=[],
            outputs=[upload_output]
        )
        
        list_docs_button = gr.Button("List Indexed Documents")
        docs_output = gr.Textbox(label="Indexed Documents")
        
        list_docs_button.click(
            list_documents,
            inputs=[],
            outputs=[docs_output]
        )
    
    with gr.Tab("Settings"):
        with gr.Row():
            gr.Markdown("## Database Management")
            flush_db_btn = gr.Button("🗑️ Flush All Databases", variant="stop", scale=1)
        
        flush_result = gr.Textbox(label="Flush Result")
        
        flush_db_btn.click(
            flush_databases,
            inputs=[],
            outputs=[flush_result]
        )
        
        gr.Markdown("## System Settings")
        api_key = gr.Textbox(
            label="Groq API Key",
            placeholder="Enter your Groq API key",
            type="password",
            value=os.getenv("GROQ_API_KEY", "")
        )
        save_btn = gr.Button("Save Settings")
        
        def save_settings(key):
            try:
                os.environ["GROQ_API_KEY"] = key
                return "Settings saved!"
            except Exception as e:
                return f"Error saving settings: {str(e)}"
        
        save_btn.click(
            save_settings,
            inputs=[api_key],
            outputs=[gr.Textbox(label="Status")]
        )
        
        gr.Markdown("## Debugging")
        test_viz_btn = gr.Button("Test Visualization")
        test_viz_output = gr.HTML(label="Test Visualization")
        
        test_viz_btn.click(
            create_test_html_visualization,
            inputs=[],
            outputs=[test_viz_output]
        )

# Launch the app
if __name__ == "__main__":
    demo.launch()