import pandas as pd
import streamlit as st
from my_model.tabs.run_inference import InferenceRunner
from my_model.tabs.finetuning_evaluation import KBVQAEvaluator
from my_model.state_manager import StateManager

class UIManager():
    """Manages the user interface for the Streamlit application."""

    def __init__(self):
        """Initializes the UIManager with predefined tabs."""
        
        self.tabs = {
            "Home": self.display_home,
            "Dataset Analysis": self.display_dataset_analysis,
            "Finetuning and Evaluation Results": self.display_finetuning_evaluation,
            "Run Inference": self.display_run_inference,
            "Dissertation Report": self.display_dissertation_report,
            "Code": self.display_code,
            "More Pages will follow .. ": self.display_placeholder
        }

        state_manager = StateManager()
        state_manager.initialize_state()

    
    def add_tab(self, tab_name, display_function):
        """Adds a new tab to the UI."""
        self.tabs[tab_name] = display_function

    
    def display_sidebar(self):
        """Displays the sidebar for navigation."""
        
        st.sidebar.title("Navigation")
        selection = st.sidebar.radio("Go to", list(self.tabs.keys()), disabled=st.session_state['loading_in_progress'])
        return selection
        

    def display_selected_page(self, selection):
        """Displays the selected page based on user's choice."""
        
        if selection in self.tabs:
            self.tabs[selection]()

    
    def display_home(self):
        """Displays the Home page of the application."""
        
        st.title('MultiModal Learning for Visual Question Answering using World Knowledge')
        st.text('')
        st.header('(Knowledge-Based Visual Question Answering)')
        st.text('')
        st.text('')
        st.text('')
        st.write("""\n\n\n\nThis is an interactive application developed to demonstrate my project as part of the dissertation for Masters degree in Artificial Intelligence at the [University of Bath](https://www.bath.ac.uk/). 
                    \n\n\nDeveloped by: [Mohammed H AlHaj](https://www.linkedin.com/in/m7mdal7aj) | Dissertation Supervisor: [Andreas Theophilou](https://researchportal.bath.ac.uk/en/persons/andreas-theophilou)
                    \n\nFurther details will be updated later . .""")

    
    def display_dataset_analysis(self):
        """Displays the Dataset Analysis page."""
        
        st.title("OK-VQA Dataset Analysis")
        st.write("This is a Place Holder until the contents are uploaded.")

    
    def display_finetuning_evaluation(self):
        """Displays the Finetuning and Evaluation Results page."""
        
        st.title("Finetuning and Evaluation Results")
        st.write("This page demonstrates the fine-tuning and model evaluation results")
        st.write("\n")
        evaluator = KBVQAEvaluator()
        evaluator.run()

    
    def display_run_inference(self):
        """Displays the Run Inference page."""
        
        st.title("Run Inference")
        st.write("Please note that this is not a general purpose model, it is specifically trained on [OK-VQA Dataset](https://okvqa.allenai.org/) and desgined to give short and direct answers to the given questions about the given image.")
        st.write("\n")
        inference_runner = InferenceRunner()
        inference_runner.run_inference()

    
    def display_dissertation_report(self):
        """Displays the Dissertation Report page."""
        
        st.title("Dissertation Report")
        st.write("Click the link below to view the PDF.")
        # Error handling for file access should be considered here
        st.download_button(
            label="Download PDF",
            data=open("Files/Dissertation Report.pdf", "rb"),
            file_name="example.pdf",
            mime="application/octet-stream"
        )

    
    def display_code(self):
        """Displays the Code page with a link to the project's code repository."""
        
        st.title("Code")
        st.markdown("You can view the code for this project on HuggingFace Space files page.")
        st.markdown("[View Code](https://huggingface.co/spaces/m7mdal7aj/Mohammed_Alhaj_PlayGround/tree/main)", unsafe_allow_html=True)

    
    def display_placeholder(self):
        """Displays a placeholder for future content."""
        
        st.title("Stay Tuned")
        st.write("This is a Place Holder until the contents are uploaded.")