#!/usr/bin/env bash
# Record the split-pane rewind demo to an MP4.
set -uo pipefail
SP="$(cd "$(dirname "$0")" && pwd)"
REPO=/home/justin/github/zerto-ai-rewind
PY="$REPO/.venv/bin/python"
VPG_ID="$(python3 -c "import json;print(json.load(open('$SP/demo.json'))['vpg_id'])")"
VPG_NAME="$(python3 -c "import json;print(json.load(open('$SP/demo.json'))['vpg_name'])")"
TAKE="${1:-take1}"
CAST="$SP/$TAKE.cast"; GIF="$SP/$TAKE.gif"; MP4="$SP/$TAKE.mp4"

tmux -L demo kill-server 2>/dev/null
tmux -L rec  kill-server 2>/dev/null
sleep 1

# demo session: driver left, journal right
tmux -L demo new-session -d -s demo -x 200 -y 50 -c "$REPO" \
  "$PY $SP/driver.py; echo; echo '  [take complete]'; sleep 3; tmux -L demo kill-server"
tmux -L demo set-option -g status off
tmux -L demo split-window -h -l 60 -t demo -c "$REPO" \
  "JOURNAL_ROWS=10 $PY $SP/journal.py $VPG_ID $VPG_NAME"
tmux -L demo select-pane -t 0

# recorder session gives asciinema a pty
tmux -L rec new-session -d -s rec -x 200 -y 50 \
  "$SP/recvenv/bin/asciinema rec '$CAST' --overwrite --quiet -c 'tmux -L demo attach -t demo'"

echo "recording -> $CAST"
for i in $(seq 1 600); do
  tmux -L rec has-session -t rec 2>/dev/null || break
  sleep 2
done
tmux -L demo kill-server 2>/dev/null
tmux -L rec kill-server 2>/dev/null
sleep 1

[ -s "$CAST" ] || { echo "NO CAST PRODUCED"; exit 1; }
echo "cast: $(du -h "$CAST" | cut -f1)  duration: $(python3 -c "
import json,sys
last=0
for l in open('$CAST'):
    l=l.strip()
    if l.startswith('['):
        last=json.loads(l)[0]
print(f'{last:.0f}s')")"

"$SP/bin/agg" --font-size 14 --fps-cap 10 --idle-time-limit 2 --theme asciinema "$CAST" "$GIF"
ffmpeg -y -loglevel error -i "$GIF" \
  -movflags +faststart -pix_fmt yuv420p -c:v libx264 -crf 20 \
  -vf "scale=trunc(iw/2)*2:trunc(ih/2)*2" "$MP4"
echo "MP4: $MP4  ($(du -h "$MP4" | cut -f1))"
ffprobe -v error -show_entries format=duration:stream=width,height -of default=nw=1 "$MP4"