#!/usr/bin/env bash
# The screenshots in Linux, in Playwright's image of the harness's version.
# The shots workflow runs this; `just shots-linux` runs it in Docker, from
# any machine.
#
#   bash harness/shots/linux.sh [playwright args]
#
# The pages are compared with their base's (shots/compare.mjs): each that
# moved, or is new, is left in $KNOTLESS_RUN_OUTPUTS, when set, as
# pictures named for the page and project: `1 before`, `2 after` and
# `3 difference`, as WebP small enough to keep (shots/outputs.mjs), or as
# the PNG should that fail. It fails on one the change does not name.
#
# Node, the packages and the build: shots/node.sh.

set -euo pipefail
cd "$(dirname "$0")/../.."

# The base's pages come out of git.
command -v git >/dev/null || { apt-get update -qq && apt-get install -y -qq git >/dev/null; }
source harness/shots/node.sh

status=0
node harness/shots/compare.mjs "$@" || status=$?
results=target/shots/results
if [ -n "${KNOTLESS_RUN_OUTPUTS:-}" ] && [ -d $results ]; then
  outputs=$PWD/harness/shots/outputs.mjs
  cd $results
  for shot in */; do
    [ -d "$shot" ] || continue
    page=${shot%/}
    page=${page#views-}
    for png in "$shot"*.png; do
      kind=$(basename "$png" .png)
      case ${kind##*-} in
        expected) kind="1 before" ;;
        actual) kind="2 after" ;;
        diff) kind="3 difference" ;;
        *) continue ;;
      esac
      # As WebP (outputs.mjs), or else as the PNG, saying so.
      out="$KNOTLESS_RUN_OUTPUTS/$page $kind"
      node "$outputs" "$png" "$out" "${kind#* }" && continue
      echo "==> $page $kind.png: kept as PNG, being no WebP"
      cp "$png" "$out.png"
    done
  done
fi
exit $status