#!/usr/bin/env bash

# port of the server in standalone mode, aka the open port
STANDALONE_PORT=25565
# port of the server in proxy mode, aka the internal port
PROXY_PORT=25566

function main {

  # parse arguments
  velocity=false
  bungeecord=false
  standalone=false
  fetch=false
  help=false

  for arg in "@$"; do
    case "$arg" in
      "velocity")
        velocity=true
        if $bungeecord || $standalone; then
          echo "argument velocity can't be used together with bungeecord or standalone"
          exit 1
        fi
        ;;
      "benugeecord")
        bungeecord=true
        if $velocity || $standalone; then
          echo "argument bungeecord can't be used together with velocity or standalone"
          exit 1
        fi
        ;;
      "standalone")
        standalone=true
        if $bungeecord || $velocity; then
          echo "argument standalone can't be used together with bungeecord or velocity"
          exit 1
        fi
        ;;
      "--fetch")
        fetch=true
        ;;
      "--help")
        help=true
        ;;
    esac
  done

  if $help; then
    echo "Configure the server to be used with BungeeCord, Velcity or in standalone mode."
    echo ""
    echo "Usage: $0 [OPTIONS] <mode>"
    echo ""
    echo "mode:"
    echo "  velocity"
    echo "  bungeecord"
    echo "  standalone"
    echo ""
    echo "OPTIONS:"
    echo "  --fetch - print the current mode before reconfiguring the server. Nothing else will be printed."
    echo "  --help - show this message"
    exit 0
  fi

  # fetch current configuration
  if $fetch; then
    if [ "$(yq '.proxies.velocity.enabled // false' config/paper-global.yml)" = "true" ]; then
      echo "velocity"
    elif [ "$(yq '.settings.bungeecord // false' spigot.yml)" = "true" ]; then
      echo "bungeecord"
    else
      echo "standalone"
    fi
  fi

  # Do the actual configuration
  if $velocity; then
    enable_online_mode false
    set_port "$PROXY_PORT"
    enable_velocity true
    enable_bungeecord false
  elif $bungeecord; then
    enable_online_mode false
    set_port "$PROXY_PORT"
    enable_velocity false
    enable_bungeecord true
  elif $standalone; then
    enable_online_mode true
    set_port "$STANDALONE_PORT"
    enable_velocity false
    enable_bungeecord false
  fi
}

# Enables or disables online mode
#
# Usage: enable_online_mode <true|false>
function enable_online_mode {
  sed -ie "/online-mode/c\online-mode=$1" server.properties
}

# Set the port of the server
#
# Usage: set_port <port>
function set_port {
  sed -ie "/server-port/c\server-port=$1" server.properties
}

# Enables or disables velocity in the paper config.
# Does NOT configure the forwarding secret!
#
# Usage: enable_velocity <true|false>
function enable_velocity {
  yq -iy ".proxies.velocity.enabled = $1" config/paper-global.yml
}

# Enables or disables bungeecord in spigot.yml.
#
# Usage: enable_bungeecord <true|false>
function enable_bungeecord {
  yq -iy ".settings.bungeecord = $1" spigot.yml
}

main "@$"