"""Small PDF builder for the metadata and fetch tests (needs reportlab, which the CI unit-test step installs)."""
from reportlab.lib.pagesizes import letter
from reportlab.pdfgen import canvas


def make_pdf(path, pages, title=None, author=None):
    """pages: list of lists of text lines; an empty list = a page with only a picture-like box (no text layer)."""
    c = canvas.Canvas(path, pagesize=letter)
    if title:
        c.setTitle(title)
    if author:
        c.setAuthor(author)
    for lines in pages:
        y = 700
        if not lines:
            c.rect(100, 100, 300, 400, fill=1)
        for ln in lines:
            if ln == "":
                y -= 30
                continue
            c.setFont("Helvetica", 18)
            c.drawString(100, y, ln)
            y -= 24
        c.showPage()
    c.save()
    return path