#!/usr/bin/env bash

SERVICE_NAME=""
SERVICE_FILE=""
SERVICE_CREATED="no"
SERVICE_MODE_ACTIVE="none"

stop_service_if_running() {
  local service_name="${1:-${SERVICE_NAME:-${CORE}_minecraft}}"

  if [[ "$INIT_SYSTEM" != "systemd" ]]; then
    return 0
  fi

  if [[ "${DRY_RUN:-no}" == "yes" ]]; then
    info "[dry-run] systemctl stop ${service_name}"
    return 0
  fi

  emit_step "service_stop" "$service_name"
  systemctl stop "$service_name" >/dev/null 2>&1 || true
}

create_service() {
  local core="$1"
  local dir="$2"
  local mode="$3"
  local start_script="$4"
  local start_script_escaped="$4"

  start_script_escaped="${start_script_escaped//\\/\\\\}"
  start_script_escaped="${start_script_escaped//\"/\\\"}"
  start_script_escaped="${start_script_escaped//%/%%}"

  SERVICE_NAME="${core}_minecraft"
  SERVICE_FILE="/etc/systemd/system/${SERVICE_NAME}.service"

  if [[ "$mode" == "none" || "$INIT_SYSTEM" != "systemd" ]]; then
    warn "$(t service_create_skipped "$mode" "$INIT_SYSTEM")"
    SERVICE_MODE_ACTIVE="none"
    return 0
  fi

  emit_step "service_create" "$core:$mode"
  if [[ "$mode" == "tmux-systemd" ]]; then
    run_cmd bash -c "cat > '$SERVICE_FILE' <<EOF
[Unit]
Description=Minecraft ${core} server (tmux)
After=network.target

[Service]
Type=forking
User=${SERVER_USER}
Group=${SERVER_USER}
WorkingDirectory=${dir}
ExecStart=/usr/bin/tmux new-session -d -s ${SERVICE_NAME} \"${start_script_escaped}\"
ExecStop=/usr/bin/tmux send-keys -t ${SERVICE_NAME} 'stop' C-m
ExecStopPost=/bin/sleep 8
Restart=on-failure
RestartSec=5

[Install]
WantedBy=multi-user.target
EOF"
  elif [[ "$mode" == "screen" ]]; then
    run_cmd bash -c "cat > '$SERVICE_FILE' <<EOF
[Unit]
Description=Minecraft ${core} server (screen)
After=network.target

[Service]
Type=forking
User=${SERVER_USER}
Group=${SERVER_USER}
WorkingDirectory=${dir}
ExecStart=/usr/bin/screen -dmS ${SERVICE_NAME} \"${start_script_escaped}\"
ExecStop=/usr/bin/screen -S ${SERVICE_NAME} -X quit
Restart=on-failure
RestartSec=5

[Install]
WantedBy=multi-user.target
EOF"
  else
    run_cmd bash -c "cat > '$SERVICE_FILE' <<EOF
[Unit]
Description=Minecraft ${core} server
After=network.target

[Service]
Type=simple
User=${SERVER_USER}
Group=${SERVER_USER}
WorkingDirectory=${dir}
ExecStart="${start_script_escaped}"
Restart=on-failure
RestartSec=5

[Install]
WantedBy=multi-user.target
EOF"
  fi

  SERVICE_CREATED="yes"
  SERVICE_MODE_ACTIVE="$mode"
  emit_step "service_reload_enable" "$SERVICE_NAME"
  run_cmd systemctl daemon-reload
  run_cmd systemctl enable "$SERVICE_NAME"
}

start_service() {
  if [[ "$SERVICE_MODE_ACTIVE" == "none" ]]; then
    info "$(t service_start_skipped "$SERVICE_MODE_ACTIVE")"
    return 0
  fi
  emit_step "service_start" "$SERVICE_NAME"
  run_cmd systemctl restart "$SERVICE_NAME"
}

remove_service_if_exists() {
  if [[ "$SERVICE_CREATED" != "yes" ]]; then
    return 0
  fi
  if [[ -n "$SERVICE_NAME" ]]; then
    run_cmd systemctl stop "$SERVICE_NAME" || true
    run_cmd systemctl disable "$SERVICE_NAME" || true
  fi
  if [[ -n "${SERVICE_FILE}" && -f "$SERVICE_FILE" ]]; then
    run_cmd rm -f "$SERVICE_FILE"
  fi
  run_cmd systemctl daemon-reload || true
}