"""Render PDF pages without Poppler; requires PyMuPDF."""

import argparse
from pathlib import Path

import pymupdf


def convert(pdf_path, output_dir, max_dim=1600):
    if max_dim <= 0:
        raise ValueError("max_dim must be positive")
    output = Path(output_dir)
    output.mkdir(parents=True, exist_ok=True)
    with pymupdf.open(pdf_path) as document:
        for index, page in enumerate(document):
            scale = min(max_dim / page.rect.width, max_dim / page.rect.height)
            pixmap = page.get_pixmap(matrix=pymupdf.Matrix(scale, scale), alpha=False)
            target = output / f"page_{index + 1}.png"
            pixmap.save(str(target))
            print(target)


if __name__ == "__main__":
    parser = argparse.ArgumentParser(description=__doc__)
    parser.add_argument("input")
    parser.add_argument("output")
    parser.add_argument("--max-dim", type=int, default=1600)
    args = parser.parse_args()
    convert(args.input, args.output, args.max_dim)