from __future__ import annotations

import re
from functools import cache
from pathlib import Path

from .html_utils import SafeHtml, attr, trusted

_ICON_DIR = Path(__file__).parents[1] / "assets" / "lucide"
_ICON_FILES = {
    "blog": "newspaper",
    "business": "briefcase",
    "docs": "book-open",
    "github": "code",
    "more": "ellipsis-vertical",
    "privacy": "shield-check",
}


def _svg_icon(name: str, css_class: str = "copy-icon") -> SafeHtml:
    path = _lucide_body(name)
    safe_class = attr(f"lucide-icon {css_class}")
    return trusted(
        f'<svg class="{safe_class}" aria-hidden="true" focusable="false" width="16" height="16" viewBox="0 0 24 24" '
        f'fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" '
        f'stroke-linejoin="round">{path}</svg>'
    )


@cache
def _lucide_body(name: str) -> str:
    file_stem = _ICON_FILES.get(name, name)
    raw = (_ICON_DIR / f"{file_stem}.svg").read_text(encoding="utf-8")
    match = re.search(r"<svg\b[^>]*>(.*?)</svg>", raw, flags=re.DOTALL)
    if not match:
        raise ValueError(f"Invalid Lucide SVG: {file_stem}")
    return re.sub(r"\s+", " ", match.group(1).strip())