"""Font resolution helpers for PDF rendering."""

from __future__ import annotations

from dataclasses import dataclass
from pathlib import Path


@dataclass(frozen=True)
class QuartoFonts:
    main_font: str
    sans_font: str
    requires_system_fonts: bool


def resolve_quarto_fonts(fonts_dir: Path) -> QuartoFonts:
    """Resolve Quarto font names.

    Quarto/xelatex currently uses installed font family names. We still accept
    fonts_dir so callers can validate/report environment state consistently.
    """
    expected = [
        fonts_dir / "SourceHanSerifSC-Regular.otf",
        fonts_dir / "SourceHanSansSC-Bold.otf",
    ]
    requires_system_fonts = not all(path.exists() for path in expected)
    return QuartoFonts(
        main_font="Source Han Serif CN",
        sans_font="Source Han Sans CN",
        requires_system_fonts=requires_system_fonts,
    )