"""
Helper functions for the Computer Vision Journey presentation.
"""

import os
import streamlit as st


def check_asset_exists(filename):
    """
    Check if an asset file exists and return the path if it does, otherwise return None.

    Args:
        filename (str): The filename to check in the assets directory

    Returns:
        str or None: The full path to the asset if it exists, None otherwise
    """
    assets_dir = os.path.join(os.path.dirname(os.path.dirname(__file__)), "assets")
    filepath = os.path.join(assets_dir, filename)

    if os.path.exists(filepath):
        return filepath
    else:
        return None


def display_asset_or_placeholder(
    filename, asset_type="image", caption=None, use_column_width=True
):
    """
    Display an asset or a placeholder if the asset doesn't exist.

    Args:
        filename (str): The filename of the asset
        asset_type (str): The type of asset ('image' or 'video')
        caption (str, optional): Caption for the asset
        use_column_width (bool, optional): Whether to use the full column width
    """
    filepath = check_asset_exists(filename)

    if filepath:
        if asset_type == "image":
            st.image(filepath, caption=caption, use_container_width=use_column_width)
        elif asset_type == "video":
            st.video(filepath)
    else:
        if asset_type == "image":
            st.warning(
                f"Place '{filename}' in the assets directory to display the {caption or 'image'}"
            )
        elif asset_type == "video":
            st.warning(
                f"Place '{filename}' in the assets directory to display the {caption or 'video'}"
            )


def display_iframe_or_link(url, height=500):
    """
    Display an iframe to an external URL or a link if iframe loading fails.

    Args:
        url (str): The URL to embed
        height (int, optional): Height of the iframe
    """
    try:
        st.components.v1.iframe(url, height=height)
    except Exception:
        st.warning(f"Unable to load iframe. Please visit the link directly: {url}")
        st.markdown(f"[Open in new tab]({url})")


def get_project_tabs():
    """
    Return a list of project tab names for consistent naming across pages.

    Returns:
        list: List of project tab names
    """
    return ["Black Bee Drones", "Asimov Foundation", "CafeDL", "Tech4Humans"]