"""Log visualization utilities for the backend UI."""

from pathlib import Path
from typing import Union

from src.envs import NUM_LINES_VISUALIZE
from src.logging import log_file


def log_file_to_html_string(log_path: Union[str, Path] = log_file, reverse: bool = True) -> str:
    """
    Convert log file contents to HTML string for display.

    Args:
        log_path: Path to the log file
        reverse: If True, show newest entries first

    Returns:
        HTML-formatted log contents
    """
    log_path = Path(log_path)

    if not log_path.exists():
        return "<pre>No logs yet.</pre>"

    try:
        with open(log_path, "r") as f:
            lines = f.readlines()

        # Limit number of lines
        lines = lines[-NUM_LINES_VISUALIZE:]

        if reverse:
            lines = lines[::-1]

        # Escape HTML and wrap in pre tag
        content = "".join(lines)
        content = content.replace("&", "&amp;")
        content = content.replace("<", "&lt;")
        content = content.replace(">", "&gt;")

        return f"<pre style='font-size: 12px; white-space: pre-wrap;'>{content}</pre>"

    except Exception as e:
        return f"<pre>Error reading log file: {e}</pre>"