#!/usr/bin/env bash
# Start the mchost-hosted Fabric server (server/fabric-server-launch.jar).
#
#   ./start.sh                                  quick tunnel, random invite secret
#   SECRET=hunter2 ./start.sh                   stable invite secret (same invite format)
#   TOKEN=eyJh... PUBLIC_HOST=mc.example.com ./start.sh    named tunnel on your domain
#   MEMORY=4G ./start.sh                        JVM heap for the Minecraft server
#   ./start.sh --no-tunnel                      local only
#   ./start.sh --cloudflared /path/to/cloudflared
#
# Any extra arguments are passed straight through to mchost.
# DRY_RUN=1 ./start.sh prints the command instead of running it.
set -euo pipefail
cd "$(dirname "$0")"

MCHOST=target/release/mchost
SERVER_JAR=server/fabric-server-launch.jar

if [[ ! -x "$MCHOST" ]]; then
    echo "[start] mchost binary not found; building it with cargo..."
    cargo build --release
fi

if [[ ! -f "$SERVER_JAR" ]]; then
    echo "[start] error: $SERVER_JAR is missing." >&2
    echo "[start] Install the Fabric server first (see mod/README.md or README.md)." >&2
    exit 1
fi

# Invite secret: SECRET=... for a stable one, otherwise random per run so old
# invites stop working when you restart.
SECRET="${SECRET:-$(tr -dc 'a-z0-9' </dev/urandom | head -c 12 || true)}"

ARGS=(--eula --bridge-secret "$SECRET")
[[ -n "${MEMORY:-}" ]] && ARGS+=(-m "$MEMORY")
[[ -n "${JAVA:-}" ]] && ARGS+=(--java "$JAVA")
[[ -n "${TOKEN:-}" ]] && ARGS+=(--token "$TOKEN")
[[ -n "${PUBLIC_HOST:-}" ]] && ARGS+=(--public-host "$PUBLIC_HOST")

if [[ -n "${DRY_RUN:-}" ]]; then
    echo "$MCHOST $SERVER_JAR ${ARGS[*]} $*"
    exit 0
fi

exec "$MCHOST" "$SERVER_JAR" "${ARGS[@]}" "$@"