#!/usr/bin/env bash
# A headless Chromium for the text-overlap sweep (tools/ci/overlap-check.mjs) on a build box, without root. The build user
# has no sudo, so Playwright's `install --with-deps` cannot add the X and GTK libraries Chromium links; this script downloads
# the same Ubuntu packages with apt-get download (no root needed), unpacks them into a sysroot and points LD_LIBRARY_PATH
# at it, plus two font packages behind a private fontconfig file (the box ships no fonts at all: fc-list is empty, and
# text with no font has no width). Idempotent; re-run after a box re-provision.
#
#   infra/build-server/overlap-browser.sh            on the box (run-from-mac.sh copies and runs it; or ssh and run by hand)
#   . /srv/builds/_bin/overlap/env.sh                 what a caller sources before `node tools/ci/overlap-check.mjs`
#
# Installed 7 October 2026 on igneum-build-2 (Ubuntu 24.04.5, node 22): playwright 1.56 with chromium 1194 (headless shell
# and full), 36 packages in the sysroot, Liberation and DejaVu fonts. A page with 20 px sans-serif text measured 23 px high
# through it, so glyphs have real metrics there.
set -euo pipefail
ROOT="${OVERLAP_ROOT:-/srv/builds/_bin/overlap}"
PW_VERSION="${PW_VERSION:-1.56}"
mkdir -p "$ROOT/debs" "$ROOT/sysroot" "$ROOT/fonts" "$ROOT/fc-cache"
cd "$ROOT"
[ -f package.json ] || npm init -y >/dev/null
if ! node -e "require('playwright')" 2>/dev/null; then npm i --no-audit --no-fund "playwright@$PW_VERSION" | tail -1; fi
# the browser download (Playwright keeps it under ~/.cache/ms-playwright; a second run finds it and does nothing)
PLAYWRIGHT_SKIP_VALIDATE_HOST_REQUIREMENTS=1 npx playwright install chromium 2>&1 | tail -1 || true
PKGS="libatk1.0-0t64 libatk-bridge2.0-0t64 libatspi2.0-0t64 libx11-6 libxcomposite1 libxdamage1 libxext6 libxfixes3 libxrandr2 libgbm1 libxcb1
      libasound2t64 libxrender1 libxau6 libxdmcp6 libwayland-server0 libwayland-client0 libcups2t64 libcairo2 libpango-1.0-0 libpangocairo-1.0-0
      libpangoft2-1.0-0 libharfbuzz0b libfribidi0 libthai0 libdatrie1 libpixman-1-0 libxcb-render0 libxcb-shm0 libavahi-client3 libavahi-common3
      libxi6 libfontconfig1 libgraphite2-3 fonts-liberation fonts-dejavu-core"
cd "$ROOT/debs"
# shellcheck disable=SC2086
apt-get download $PKGS 2>&1 | grep -v '^Get:' | tail -1 || true
for d in ./*.deb; do dpkg -x "$d" "$ROOT/sysroot"; done
find "$ROOT/sysroot" -name '*.ttf' -exec cp -n {} "$ROOT/fonts/" \;
cat >"$ROOT/fonts.conf" <<EOF
<?xml version="1.0"?><!DOCTYPE fontconfig SYSTEM "fonts.dtd">
<fontconfig><dir>$ROOT/fonts</dir><cachedir>$ROOT/fc-cache</cachedir>
<alias><family>sans-serif</family><prefer><family>Liberation Sans</family></prefer></alias>
<alias><family>serif</family><prefer><family>Liberation Serif</family></prefer></alias>
<alias><family>monospace</family><prefer><family>Liberation Mono</family></prefer></alias></fontconfig>
EOF
cat >"$ROOT/env.sh" <<EOF
export LD_LIBRARY_PATH=$ROOT/sysroot/usr/lib/x86_64-linux-gnu\${LD_LIBRARY_PATH:+:\$LD_LIBRARY_PATH}
export FONTCONFIG_FILE=$ROOT/fonts.conf
export NODE_PATH=$ROOT/node_modules\${NODE_PATH:+:\$NODE_PATH}
export IGNEUM_PLAYWRIGHT_DIR=$ROOT
EOF
# shellcheck disable=SC1091
. "$ROOT/env.sh"
SHELL_BIN="$(ls -d "$HOME"/.cache/ms-playwright/chromium_headless_shell-*/chrome-linux/headless_shell | tail -1)"
if ldd "$SHELL_BIN" | grep -q 'not found'; then echo "overlap-browser: libraries still missing:"; ldd "$SHELL_BIN" | grep 'not found'; exit 1; fi
cat >"$ROOT/smoke.cjs" <<'EOF2'
const { chromium } = require("playwright");
(async () => { const b = await chromium.launch({ args: ["--no-sandbox"] }); const p = await b.newPage();
  await p.setContent('<p id=a style="font:20px sans-serif">Hello overlap world</p>');
  const h = await p.evaluate(() => document.getElementById("a").getBoundingClientRect().height); await b.close();
  if (!(h > 15 && h < 40)) { console.error("overlap-browser: text has no metrics (height " + h + ")"); process.exit(1); }
  console.log("overlap-browser: ready at " + __dirname + " (20 px text measures " + h + " px; source " + __dirname + "/env.sh)"); })();
EOF2
cd "$ROOT" && node smoke.cjs