#!/usr/bin/env nix-shell
#! nix-shell -i bash --pure
#! nix-shell -p javaPackages.compiler.openjdk17
#! nix-shell -p miniupnpc
#! nix-shell -I nixpkgs=https://github.com/NixOS/nixpkgs/tarball/nixos-25.11

PACK_AFTER=0
UPNP=0
for arg in "$@"; do
    [[ "$arg" == "--pack-after" ]] && PACK_AFTER=1
    [[ "$arg" == "--upnp" ]]       && UPNP=1
done

source /home/h3lp/mineserver/minecraft.env

if [[ "$UPNP" == 1 ]]; then
    SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
    PROPERTIES="$SCRIPT_DIR/server.properties"
    if [[ -f "$PROPERTIES" ]]; then
        PORT=$(grep -oP '(?<=^server-port=)\d+' "$PROPERTIES")
    fi
    PORT="${PORT:-25565}"
    LOCAL_IP="$(upnpc -s 2>/dev/null | grep -oP '(?<=Local LAN ip address : ).*')"

    echo "Opening port $PORT/TCP via UPnP..."
    upnpc -a "$LOCAL_IP" "$PORT" "$PORT" TCP
    TCP_OK=$?
    echo "Opening port $PORT/UDP via UPnP..."
    upnpc -a "$LOCAL_IP" "$PORT" "$PORT" UDP
    UDP_OK=$?

    if [[ $TCP_OK -ne 0 || $UDP_OK -ne 0 ]]; then
        echo "Warning: One or more UPnP port mappings failed. The port may not be reachable from outside."
    fi

    cleanup() {
        echo "Removing UPnP port mappings for $PORT..."
        upnpc -d "$PORT" TCP
        upnpc -d "$PORT" UDP
    }
    trap cleanup EXIT
fi

java -Xmx${MEMORY_MAX}M -Xms${MEMORY_MIN}M -jar minecraft_server.jar nogui

if [[ "$PACK_AFTER" == 1 ]]; then
    read -rp "Pack and publish world? [y/N] " answer
    if [[ "$answer" =~ ^[Yy]$ ]]; then
        set -e
        WORLD=/home/h3lp/mineserver/world
        OUTPUT=/var/www/hostedfiles/world.tar.xz
        TMP=$(mktemp)
        tar -cJf "$TMP" -C "$WORLD" .
        mv "$TMP" "$OUTPUT"
        chmod 644 "$OUTPUT"
        echo "Done: $OUTPUT"
        set +e
    fi
fi

read -rp "Press Enter to continue..."