services:
  mc:
    image: itzg/minecraft-server:java17
    container_name: mc_forge_server
    restart: unless-stopped
    ports:
      - "25565:25565"
      - "24454:24454/udp"
    environment:
      EULA: "TRUE"
      TYPE: "FORGE"
      VERSION: "1.20.1"
      MEMORY: "12G"

      # Server Properties Mapping
      VIEW_DISTANCE: "8"
      SIMULATION_DISTANCE: "6"
      NETWORK_COMPRESSION_THRESHOLD: "256"
      MAX_TICK_TIME: "120000"       # Prevents watchdog crashes during heavy worldgen
      PLAYER_IDLE_TIMEOUT: "0"      # Prevents auto-kicking AFK players
      ALLOW_FLIGHT: "TRUE"          # Prevents kicks when using Ad Astra rockets/ships
      SYNC_CHUNK_WRITES: "FALSE"
      ENABLE_STATUS: "TRUE"
      MOTD: "MC SotoHome!"
      MAX_PLAYERS: "15"
      DIFFICULTY: "hard"
      ONLINE_MODE: "FALSE"

      # JVM Garbage Collection & Network Flags
      JVM_OPTS: >-
        -Dfml.readTimeout=180
        -Dfml.loginTimeout=180
        -XX:+UnlockExperimentalVMOptions
        -XX:+UseG1GC
        -XX:MaxGCPauseMillis=50
        -XX:G1HeapRegionSize=8M
        -XX:G1ReservePercent=15
        -XX:InitiatingHeapOccupancyPercent=45
        -XX:G1MixedGCCountTarget=4
        -XX:G1HeapWastePercent=5
        -XX:G1NewSizePercent=30
        -XX:G1MaxNewSizePercent=40
        -XX:SurvivorRatio=8
        -XX:MaxTenuringThreshold=1
        -XX:+DisableExplicitGC
        -XX:+AlwaysPreTouch
    volumes:
      - ./data:/data