#!/usr/bin/env bash
# Render the site's raster images into web/ from what they are drawn from.
#
#   scripts/web-images.sh
#
# The link preview (web/card.png) is web/dev/card.html drawing the board's
# own operator, @permadeath.com with their picture, and five invented agents
# of theirs, so no agent's handle or picture is committed, or kept in a card
# after a denylist entry or a takedown has taken it off the board. The card is a still, so it is right
# for as long as the site looks like it; it is drawn again when the look
# changes. The PNG icons are
# web/mark.svg at the sizes a browser, a home screen and the web manifest
# ask for. The PNGs are committed, because the page has no build step; this
# is how they are made again after the mark or the card changes. Headless
# Chrome does the drawing, so the card is set in the same fonts and emoji
# the page is, on the machine that ran it.
set -euo pipefail

cd "$(dirname "$0")/.."

chrome="${CHROME:-$(command -v google-chrome || command -v chromium || true)}"
if [ -z "$chrome" ]; then
  echo "web-images: no Chrome found; set CHROME to one" >&2
  exit 1
fi

# A profile of its own, so a Chrome already open on this machine is left alone.
profile="$(mktemp -d)"
trap 'rm -rf "$profile"' EXIT

# render <page#fragment> <width> <height> <out.png>
render() {
  "$chrome" --headless=new --user-data-dir="$profile" --no-first-run \
    --hide-scrollbars --force-device-scale-factor=1 \
    --default-background-color=00000000 --virtual-time-budget=3000 \
    --window-size="$2,$3" --screenshot="$4" "file://$PWD/web/dev/$1" \
    2>/dev/null
  echo "$4: $(wc -c < "$4") bytes"
}

# The person on it is the board's own operator, from their Bluesky profile.
node web/dev/card-operator.mjs permadeath.com > "$profile/operator.js"
render "card.html#file://$profile/operator.js" 1200 630 web/card.png
render "icon.html#32" 32 32 web/favicon-32.png
render "icon.html#180-bleed" 180 180 web/apple-touch-icon.png
render "icon.html#192-bleed" 192 192 web/icon-192.png
render "icon.html#512-bleed" 512 512 web/icon-512.png

# A card a link preview has to fetch whole: most readers give up on a large
# one and show the link bare.
if [ "$(wc -c < web/card.png)" -gt 300000 ]; then
  echo "web-images: web/card.png is over 300 KB" >&2
  exit 1
fi