#!/usr/bin/env bash
# Frey's servers: which one is on, which exist, and switching between them.
# The macOS twin of tools/server.ps1 — same commands, same behaviour.
#
#   tools/server.sh status          # which server is on, and is it up
#   tools/server.sh list            # every server in this repo
#   tools/server.sh switch terror   # turn "terror" on (and the current one off)
set -euo pipefail
ns=game-servers
root="$(cd "$(dirname "$0")/.." && pwd)"

active() { kubectl -n "$ns" get statefulset minecraft -o jsonpath='{.spec.template.metadata.annotations.valls\.dev/server}'; }

case "${1:-status}" in
status)
  echo "Server on now: $(active)"
  kubectl -n "$ns" get pod minecraft-0
  ;;
list)
  on=$(active)
  for d in "$root"/servers/*/; do
    n=$(basename "$d")
    [[ -f "$d/server.env" ]] || continue
    v=$(grep -E '^(TYPE|VERSION)=' "$d/server.env" | cut -d= -f2 | tr '\n' ' ')
    printf '%-20s %s%s\n' "$n" "$v" "$([[ $n == "$on" ]] && echo ' <- on now')"
  done
  ;;
switch)
  name="${2:?say which server: tools/server.sh switch <name>}"
  [[ "$name" =~ ^[a-z0-9][a-z0-9-]{0,39}$ ]] || { echo "server names are lowercase letters, digits and dashes only" >&2; exit 1; }
  git -C "$root" fetch -q origin
  git -C "$root" cat-file -e "origin/main:servers/$name/server.env" 2>/dev/null ||
    { echo "servers/$name/server.env is not pushed yet: commit and push it first" >&2; exit 1; }
  on=$(active)
  [[ "$on" == "$name" ]] && { echo "$name is already on."; exit 0; }
  kubectl -n "$ns" patch statefulset minecraft --type merge \
    -p "{\"spec\":{\"template\":{\"metadata\":{\"annotations\":{\"valls.dev/server\":\"$name\"}}}}}"
  echo "Switching $on -> $name. Waiting for it to start (a brand-new server can take up to 15 minutes)..."
  kubectl -n "$ns" rollout status statefulset/minecraft --timeout=16m ||
    { echo "It did not start. Look at: kubectl -n $ns logs minecraft-0 -c minecraft --tail=100" >&2; exit 1; }
  echo "$name is on."
  ;;
*)
  echo "usage: tools/server.sh status | list | switch <name>" >&2
  exit 1
  ;;
esac