#!/usr/bin/env bash
set -euo pipefail

# Headless GL: start a virtual framebuffer unless a real DISPLAY is provided
# (a GPU node may pass through an X socket). CasparCG's mixer needs a GL context.
if [ -z "${DISPLAY:-}" ]; then
  echo "[entrypoint] starting Xvfb on :99"
  Xvfb :99 -screen 0 1920x1080x24 -nolisten tcp &
  export DISPLAY=:99
  # Give Xvfb a moment to create the socket.
  for i in $(seq 1 20); do
    [ -e /tmp/.X11-unix/X99 ] && break
    sleep 0.25
  done
fi

# Ensure the HLS preview directory exists before CasparCG attaches its second
# FFMPEG consumer (mam-api serves /live/<channel_id>/* from the shared volume).
if [ -n "${CHANNEL_ID:-}" ]; then
  mkdir -p "/media/live/${CHANNEL_ID}"
fi

# casparcg.config writes log/ + data/ under /media (the install dir is a symlink
# into a possibly read-only apt location), so make sure those exist + writable.
mkdir -p /media/casparcg/log /media/casparcg/data /media/templates

# Launch CasparCG Server. The 2.5 deb installs the binary on PATH (symlinked to
# /usr/local/bin/casparcg at build) and takes the config file as its first arg.
# Run from /opt/casparcg (symlink to the install dir) so any relative lookups in
# the server resolve against the install tree.
cd /opt/casparcg
CASPAR_BIN="casparcg"
command -v "$CASPAR_BIN" >/dev/null || CASPAR_BIN=/usr/bin/casparcg-server-2.5
CASPAR_CFG=/opt/casparcg/casparcg.config
echo "[entrypoint] launching CasparCG: $CASPAR_BIN $CASPAR_CFG"
"$CASPAR_BIN" "$CASPAR_CFG" &
CASPAR_PID=$!

# Forward termination to CasparCG so the channel closes cleanly.
term() {
  echo "[entrypoint] terminating CasparCG ($CASPAR_PID)"
  kill -TERM "$CASPAR_PID" 2>/dev/null || true
  wait "$CASPAR_PID" 2>/dev/null || true
  exit 0
}
trap term SIGTERM SIGINT

# Launch the Node control shim (foreground). If it exits, stop the container.
cd /app
node src/index.js &
NODE_PID=$!

wait -n "$CASPAR_PID" "$NODE_PID"
term