"""Render invoice HTML to PDF with a headless Chromium-family browser through Playwright.

PDF_BROWSER picks the browser: an installed `msedge` (default) or `chrome`, or `chromium` — Playwright's own
build, after `playwright install chromium`."""
from playwright.sync_api import sync_playwright

from app import config

BROWSER = config.get("PDF_BROWSER", "msedge")


def render(html):
    """The A4 PDF of a full-bleed HTML page, as bytes."""
    with sync_playwright() as p:
        browser = p.chromium.launch(channel=BROWSER)
        try:
            page = browser.new_page()
            page.set_content(html, wait_until="load")
            # Full-bleed: the template's @page/.sheet own every margin, so the sheet maps 1:1 to the A4 page
            # and the address can be placed by physical millimetres (window-envelope position). Any margin
            # here would re-inset (and scale) the 210mm sheet and throw those millimetres off.
            return page.pdf(format="A4", print_background=True, prefer_css_page_size=True,
                            margin={"top": "0", "bottom": "0", "left": "0", "right": "0"})
        finally:
            browser.close()