"""
Chart viewer component for displaying candlestick charts.
"""

from pathlib import Path
from typing import Optional

import gradio as gr


def create_chart_viewer() -> gr.Image:
    """
    Create chart viewer component.

    Returns:
        Gradio Image component for displaying charts
    """
    return gr.Image(
        label="Candlestick Chart",
        type="filepath",
        interactive=False,
        show_label=True,
    )


def display_chart(chart_path: Optional[str]) -> Optional[str]:
    """
    Prepare chart for display.

    Args:
        chart_path: Path to chart image

    Returns:
        Chart path if exists, None otherwise
    """
    if not chart_path:
        return None

    chart_file = Path(chart_path)

    if not chart_file.exists():
        return None

    return str(chart_file)


def create_placeholder_message() -> str:
    """
    Create placeholder message when no chart is available.

    Returns:
        Placeholder text
    """
    return "Chart will appear here after analysis completes..."