# ui/chatbot_tab.py

import gradio as gr
from app.functions.database_handling import list_databases
from utils.helpers import extract_text_from_files
from app.llm_handling import answer_question

def create_chatbot_tab():
    """Crea il tab 'Chatbot' dell'interfaccia Gradio."""
    
    def chat_upload_and_respond(files, chat_history, db_name):
        """Gestisce il caricamento dei file e aggiorna la chat con il contenuto."""
        if chat_history is None:
            chat_history = []
        
        text = extract_text_from_files(files)
        
        chat_history.append({
            "role": "assistant",
            "content": f"📄 Contenuto dei documenti caricati:\n{text}"
        })
        
        return chat_history

    def respond(message, chat_history, db_name):
        """Genera una risposta alla domanda dell'utente e aggiorna la chat."""
        if chat_history is None:
            chat_history = []

        new_messages = answer_question(message, db_name)
        chat_history.extend(new_messages)

        return "", chat_history

    def clear_chat():
        """Pulisce la cronologia della chat."""
        return [], []

    # Ottieni la lista aggiornata dei database
    databases = list_databases()

    with gr.Tab("Chatbot"):
        with gr.Row():
            with gr.Column(scale=2):
                # Dropdown per selezionare il database
                db_name_chat = gr.Dropdown(
                    choices=databases,
                    label="Seleziona Database",
                    value="default_db"
                )

                # Componente Chatbot
                chatbot = gr.Chatbot(label="Conversazione", type="messages")
                
                # Input per la domanda
                question_input = gr.Textbox(
                    label="Fai una domanda",
                    placeholder="Scrivi qui la tua domanda...",
                    lines=2
                )
                
                # Bottoni per azioni
                with gr.Row():
                    ask_button = gr.Button("Invia")
                    clear_button = gr.Button("Pulisci Chat") 
                
                # Upload file con dimensioni ridotte
                with gr.Row():
                    file_input = gr.File(
                        label="Carica PDF/Docx/TXT per la conversazione", 
                        file_types=[".pdf", ".docx", ".txt"], 
                        file_count="multiple",
                        height="100px",
                        scale=3
                    )
                    upload_button = gr.Button("Carica Documenti", scale=1)
        
        # Stato della chat
        chat_state = gr.State([])

        # Eventi per i bottoni
        upload_button.click(
            fn=chat_upload_and_respond,
            inputs=[file_input, chat_state, db_name_chat],
            outputs=chatbot
        )

        ask_button.click(
            fn=respond,
            inputs=[question_input, chat_state, db_name_chat],
            outputs=[question_input, chatbot]
        )

        clear_button.click(
            fn=clear_chat,
            outputs=[chatbot, chat_state]
        )

    return