#!/usr/bin/env bash
# Re-record the manual: docs/manual/README.md's pictures, from the app itself.
#
#   tools/manual/record.sh <library-folder> [scene...]
#
# Needs Xvfb, xdotool, ImageMagick's `import` and ffmpeg. Builds the desktop
# binary if it is not there, starts a private X server, opens the folder as
# a library in a throwaway profile, runs the scenes (all of them by default)
# and writes PNGs and GIFs into docs/manual/media/.
#
# The library folder is the author's demo set — seventy face-free frames,
# the twelve-frame panorama from fixtures/pano among them — and scenes.py's
# cell coordinates assume its grid. Another folder needs those looked at.
set -euo pipefail

here="$(cd "$(dirname "$0")" && pwd)"
repo="$(cd "$here/../.." && pwd)"
library="${1:?library folder}"
shift || true

export DR_HOME="${DR_HOME:-/var/tmp/dr-manual}"
export DR_DISPLAY="${DR_DISPLAY:-:7}"
export DR_BIN="${DR_BIN:-$repo/target/release/darkroom-desktop}"
media="$repo/docs/manual/media"
mkdir -p "$media" "$DR_HOME/xdg/config/darkroom" "$DR_HOME/xdg/data/darkroom"

[ -x "$DR_BIN" ] || (cd "$repo" && cargo build --release -p darkroom-desktop)

# The models and the runtime are shared with the real profile: a segmenter
# that is not there makes "Find subjects" a picture of nothing.
for d in models runtime; do
    src="${XDG_DATA_HOME:-$HOME/.local/share}/darkroom/$d"
    [ -e "$src" ] && ln -sfn "$src" "$DR_HOME/xdg/data/darkroom/$d"
done

# A folder library, chosen: no launch screen on the way in.
cat > "$DR_HOME/xdg/config/darkroom/sessions.json" <<JSON
{ "version": 0, "sessions": [ { "backend": "folder", "server": "$library",
  "login": "", "user_id": "", "root": "", "root_chosen": true,
  "formats": [], "last_scan": null } ] }
JSON

if ! DISPLAY="$DR_DISPLAY" xdpyinfo >/dev/null 2>&1; then
    Xvfb "$DR_DISPLAY" -screen 0 1920x1200x24 +extension GLX +render -noreset \
        > "$DR_HOME/xvfb.log" 2>&1 &
    echo $! > "$DR_HOME/xvfb.pid"
    sleep 2
fi

python3 "$here/drive.py" launch
sleep 12
python3 "$here/scenes.py" "$media" "${@:-all}"
python3 "$here/drive.py" stop

# GIFs for the page; the MP4s are working files and are not kept.
for mp4 in "$media"/*.mp4; do
    [ -e "$mp4" ] || continue
    "$here/gif.sh" "$mp4" "${mp4%.mp4}.gif" 960 10
    rm "$mp4"
done
optipng -quiet -o2 "$media"/*.png || true