import pandas as pd
import streamlit as st
from my_model.gen_utilities import free_gpu_resources
from my_model.KBVQA import KBVQA, prepare_kbvqa_model


class StateManager:
    def __init__(self):
        self.initialize_state()

    def initialize_state(self):
        if 'images_data' not in st.session_state:
            st.session_state['images_data'] = {}
        if 'model_settings' not in st.session_state:
            st.session_state['model_settings'] = {'detection_model': None, 'confidence_level': None}
        if 'kbvqa' not in st.session_state:
            st.session_state['kbvqa'] = None
        if 'selected_method' not in st.session_state:
            st.session_state['selected_method'] = None

    def update_model_settings(self, detection_model=None, confidence_level=None, selected_method=None):
        if detection_model is not None:
            st.session_state['model_settings']['detection_model'] = detection_model
        if confidence_level is not None:
            st.session_state['model_settings']['confidence_level'] = confidence_level
        if selected_method is not None:
            st.session_state['selected_method'] = selected_method

    def check_settings_changed(self, current_selected_method, current_detection_model, current_confidence_level):
        return (st.session_state['model_settings']['detection_model'] != current_detection_model or
                st.session_state['model_settings']['confidence_level'] != current_confidence_level or
                st.session_state['selected_method'] != current_selected_method)

    def display_model_settings(self):
        st.write("### Current Model Settings:")
        st.table(pd.DataFrame(st.session_state['model_settings'], index=[0]))

    def display_session_state(self):
        st.write("### Current Session State:")
        data = [{'Key': key, 'Value': str(value)} for key, value in st.session_state.items()]
        df = pd.DataFrame(data)
        st.table(df)

    def load_model(self, detection_model, confidence_level):
        """Load the KBVQA model with specified settings."""
        try:
            free_gpu_resources()
            st.text("Loading the model, please wait...")
            st.session_state['kbvqa'] = prepare_kbvqa_model(detection_model)
            st.session_state['kbvqa'].detection_confidence = confidence_level
            self.update_model_settings(detection_model, confidence_level)
            st.write("Model is ready for inference.")
            free_gpu_resources()
        except Exception as e:
            st.error(f"Error loading model: {e}")    

    def get_model(self):
        """Retrieve the KBVQA model from the session state."""
        return st.session_state.get('kbvqa', None)

    def is_model_loaded(self):
        return 'kbvqa' in st.session_state and st.session_state['kbvqa'] is not None

    def reload_detection_model(self, detection_model, confidence_level):
        try:
            free_gpu_resources()
            if self.is_model_loaded():
                prepare_kbvqa_model(detection_model, only_reload_detection_model=True)
                st.session_state['kbvqa'].detection_confidence = confidence_level
                self.update_model_settings(detection_model, confidence_level)
            free_gpu_resources()
        except Exception as e:
            st.error(f"Error reloading detection model: {e}")

    # New methods to be added
    def process_new_image(self, image_key, image, kbvqa):
        if image_key not in st.session_state['images_data']:
            st.session_state['images_data'][image_key] = {
                'image': image,
                'caption': '',
                'detected_objects_str': '',
                'qa_history': [],
                'analysis_done': False
            }

    def analyze_image(self, image, kbvqa):
        img = copy.deepcopy(image)
        caption = kbvqa.get_caption(img)
        image_with_boxes, detected_objects_str = kbvqa.detect_objects(img)
        return caption, detected_objects_str, image_with_boxes

    def add_to_qa_history(self, image_key, question, answer):
        if image_key in st.session_state['images_data']:
            st.session_state['images_data'][image_key]['qa_history'].append((question, answer))

    def get_images_data(self):
        return st.session_state['images_data']

    def update_image_data(self, image_key, caption, detected_objects_str, analysis_done):
        if image_key in st.session_state['images_data']:
            st.session_state['images_data'][image_key].update({
                'caption': caption,
                'detected_objects_str': detected_objects_str,
                'analysis_done': analysis_done
            })