"""kdc preview command — standalone preview rendering."""

from __future__ import annotations

from pathlib import Path

import typer
from rich.console import Console
from rich.progress import track

from app.utils.container import Container
from app.utils.file import iter_pdfs

app = typer.Typer(help="Render page preview images from PDFs.")
console = Console()


@app.command()
def run(
    ctx: typer.Context,
    pdf_dir: Path = typer.Option(Path("pdf"), "--pdf-dir", help="PDF directory."),
) -> None:
    """Render page preview images for all PDFs in PDF_DIR."""
    container: Container = ctx.obj
    renderer = container.renderer
    if not renderer:
        console.print("[red]Renderer service not available.[/red]")
        raise typer.Exit(1)

    pdf_dir = pdf_dir.resolve()
    pdfs = iter_pdfs(pdf_dir)
    if not pdfs:
        console.print(f"[yellow]No PDFs found in {pdf_dir}[/yellow]")
        raise typer.Exit()

    rendered = 0
    for pdf in track(pdfs, description="Rendering previews..."):
        try:
            renderer.render(pdf)
            rendered += 1
        except Exception as exc:
            console.print(f"[red]Failed {pdf.name}: {exc}[/red]")

    console.print(f"[green]✓ Rendered preview images for {rendered} PDF(s).[/green]")