[Unit]
Description=Minecraft Server: %i
After=network.target

[Service]
Type=forking
User=minecraft
Group=minecraft
WorkingDirectory=/opt/minecraft-servers/%i

Environment="PATH=/usr/bin:/usr/local/bin"

# wipe dead sessions, check for active server, start server
ExecStartPre=/bin/bash -c 'screen -wipe %i-minecraft 2>/dev/null || true'
ExecStartPre=/bin/bash -c 'if screen -list | grep -q "^\\s*[0-9]*\\.%i-minecraft\\s*(.*Attached.*|.*Detached.*)"; then echo "Server %i is already running"; exit 1; fi'
ExecStart=/usr/bin/screen -dmS %i-minecraft /opt/minecraft-servers/%i/run.sh

# send stop command, wait for server to stop
ExecStop=/bin/bash -c 'screen -S %i-minecraft -X stuff "stop\\n" 2>/dev/null || true'
ExecStop=/bin/bash -c 'while screen -list | grep -q %i-minecraft; do sleep 1; done'

# send stop command, wait for stop to complete, wipe dead sessions, start server
ExecReload=/bin/bash -c 'screen -S %i-minecraft -X stuff "stop\\n" 2>/dev/null || true'
ExecReload=/bin/bash -c 'while screen -list | grep -q %i-minecraft; do sleep 1; done'
ExecReload=/bin/bash -c 'screen -wipe %i-minecraft 2>/dev/null || true'
ExecReload=/usr/bin/screen -dmS %i-minecraft /opt/minecraft-servers/%i/run.sh

TimeoutStopSec=60

Restart=on-failure
RestartSec=10

[Install]
WantedBy=multi-user.target