#!/bin/bash
# Project Zomboid Build 42 Server Entrypoint
# Based on IndifferentBroccoli/projectzomboid-server-docker
set -e

# Configuration
INSTALL_DIR="/project-zomboid"
CONFIG_DIR="/project-zomboid-config"
STEAMCMD="/home/steam/steamcmd/steamcmd.sh"
SERVER_NAME="${SERVER_NAME:-zomboid}"
PUID="${PUID:-1000}"
PGID="${PGID:-1000}"
MIN_RAM="${MIN_RAM:-4g}"
MAX_RAM="${MAX_RAM:-8g}"

echo "=== Project Zomboid Build 42 Server ==="
echo "Server Name: ${SERVER_NAME}"
echo "RAM: ${MIN_RAM} - ${MAX_RAM}"

# Set user permissions (IndifferentBroccoli approach)
echo "=== Setting file permissions ==="
usermod -o -u "${PUID}" steam
groupmod -o -g "${PGID}" steam
chown -R steam:steam "${INSTALL_DIR}" "${CONFIG_DIR}"
# Only chown writable parts of /home/steam (not read-only mounts)
chown steam:steam /home/steam
chown -R steam:steam /home/steam/steamcmd 2>/dev/null || true
chown -R steam:steam /home/steam/Steam 2>/dev/null || true

# Create required directories
mkdir -p "${CONFIG_DIR}/Server"
mkdir -p "${CONFIG_DIR}/Saves"
mkdir -p "${CONFIG_DIR}/db"

# Update/Install PZ dedicated server with Build 42 unstable branch
if [ "${AUTO_UPDATE:-true}" = "true" ]; then
    echo "=== Updating Project Zomboid Server (Build 42 unstable) ==="
    su -c "${STEAMCMD} +runscript /home/steam/install.scmd" steam
    echo "=== Update complete ==="
fi

# Configure JVM memory settings in ProjectZomboid64.json (Build 42 uses JSON config)
configure_memory() {
    local json_file="${INSTALL_DIR}/ProjectZomboid64.json"

    if [ ! -f "$json_file" ]; then
        echo "=== ProjectZomboid64.json not found, skipping memory config ==="
        return 0
    fi

    echo "=== Configuring JVM memory: Xms=${MIN_RAM}, Xmx=${MAX_RAM} ==="

    # Update Xmx
    sed -i "s/-Xmx[0-9]*[gGmM]*/-Xmx${MAX_RAM}/g" "$json_file"

    # Update or add Xms
    if grep -q "\-Xms" "$json_file"; then
        sed -i "s/-Xms[0-9]*[gGmM]*/-Xms${MIN_RAM}/g" "$json_file"
    else
        # Insert -Xms before -Xmx
        sed -i "s/\"-Xmx/\"-Xms${MIN_RAM}\",\n\t\t\"-Xmx/g" "$json_file"
    fi

    echo "=== Memory configuration complete ==="
}
configure_memory

# Check if first run (no admin DB)
ADMIN_DB="${CONFIG_DIR}/db/${SERVER_NAME}.db"

# Build server arguments
# Note: -modfolders is NOT used - mods are configured via INI only
# Reference: IndifferentBroccoli/projectzomboid-server-docker
SERVER_ARGS="-cachedir=${CONFIG_DIR} -servername ${SERVER_NAME}"

# Add admin password for first run
if [ ! -f "${ADMIN_DB}" ] && [ -n "${ADMIN_PASSWORD}" ]; then
    echo "=== First run: setting admin password ==="
    SERVER_ARGS="${SERVER_ARGS} -adminpassword ${ADMIN_PASSWORD}"
fi

# Note: Server password is set via INI file, not command line args

# Start server
cd "${INSTALL_DIR}"
echo "=== Starting Project Zomboid Server ==="
echo "Connect to: home.bdebyl.net:16261"

exec su -c "export LD_LIBRARY_PATH=${INSTALL_DIR}/jre64/lib:\${LD_LIBRARY_PATH} && ./start-server.sh ${SERVER_ARGS}" steam