#!/bin/sh
set -eu

JAR="/app/app.jar"

if [ ! -f "$JAR" ]; then
  echo "[ERROR] JAR file not found at /app/app.jar"
  exit 1
fi

echo "[INFO] ========================================"
echo "[INFO] \$uicide Music Bot (JMusicBot) Containerized"
echo "[INFO] ========================================"
echo "[INFO] Selected jar: $JAR"
echo "[INFO] Working directory: $(pwd)"
echo "[INFO] Running as: uid=$(id -u) gid=$(id -g)"

# The bot keeps config.txt, serversettings.json, Playlists/ and its instance
# lock in the working directory. If that is not writable the bot's own error is
# a misleading "Another instance of JMusicBot is already running", so check
# first and say what is actually wrong.
if ! touch .write-test 2>/dev/null; then
  echo "[ERROR] $(pwd) is not writable by uid $(id -u)."
  echo "[ERROR] Make the mounted data directory writable by that user, e.g."
  echo "[ERROR]   chown -R $(id -u):$(id -g) <host path mounted at /musicbot>"
  echo "[ERROR] or run the container with --user <uid>:<gid> matching the directory's owner."
  exit 1
fi
rm -f .write-test

# First run: write the default config.txt (the bot's own generate-config
# command) and stop, so there is something to edit. Headless, the bot would
# otherwise prompt for a token on a console that does not exist and exit
# without writing anything.
if [ ! -f "config.txt" ]; then
  echo "[INFO] config.txt: Not found - generating the default one"
  java -Dnogui=true --enable-native-access=ALL-UNNAMED -jar "$JAR" generate-config
  echo "[INFO] ========================================"
  echo "[INFO] Wrote $(pwd)/config.txt"
  echo "[INFO] Edit it and set, at minimum:"
  echo "[INFO]   discord.token  - your Discord bot token"
  echo "[INFO]   discord.owner  - your Discord user ID"
  echo "[INFO] then start the container again."
  echo "[INFO] ========================================"
  exit 0
fi
echo "[INFO] config.txt: Found"
echo "[INFO] ========================================"

# Default JVM options for optimal audio performance (ZGC with sub-ms pauses)
# Set JAVA_OPTS to override; add -Xms/-Xmx for heap limits if desired
: "${JAVA_OPTS:=-XX:+UseZGC -XX:+AlwaysPreTouch}"

# Build argv
set -- java -Dnogui=true --enable-native-access=ALL-UNNAMED

# Append JAVA_OPTS (either default or user-provided)
if [ -n "${JAVA_OPTS:-}" ]; then
  # shellcheck disable=SC2086
  set -- "$@" $JAVA_OPTS
fi

set -- "$@" -jar "$JAR"

exec "$@"