"""Componente para renderizar diffs unificados con coloreado básico."""

from __future__ import annotations

import streamlit as st


def render_unified_diff(diff_text: str) -> None:
    if not diff_text.strip():
        st.info("Sin diferencias entre las versiones seleccionadas.")
        return
    lines: list[str] = []
    for line in diff_text.splitlines():
        if line.startswith("+") and not line.startswith("+++"):
            lines.append(f'<span style="color:#22c55e">{line}</span>')
        elif line.startswith("-") and not line.startswith("---"):
            lines.append(f'<span style="color:#ef4444">{line}</span>')
        elif line.startswith("@@"):
            lines.append(f'<span style="color:#3b82f6;font-weight:bold">{line}</span>')
        else:
            lines.append(line)
    html = (
        "<pre style='background:#0f172a;color:#e2e8f0;padding:12px;border-radius:6px;"
        "font-size:12px;overflow:auto'>" + "\n".join(lines) + "</pre>"
    )
    st.markdown(html, unsafe_allow_html=True)