#!/usr/bin/env bash
# Shared environment. Point JAVA_HOME at a JDK 25 (or newer) installation.
: "${JAVA_HOME:?set JAVA_HOME to a JDK 25+ installation}"
export PATH="$JAVA_HOME/bin:$PATH"
MVN="${MVN:-mvn}"
JAR="target/transactions-1.0.0.jar"
APP_PORT="${APP_PORT:-8081}"
LOG="${LOG:-/tmp/transactions-demo.log}"

# Strip machine-specific noise from committed transcripts.
clean() { grep -v "Picked up JAVA_TOOL_OPTIONS" | grep -v "^OpenJDK 64-Bit Server VM warning"; }

# Reduce a Spring log line to its message, so transcripts diff cleanly between runs.
tidy() { sed -E 's/^[0-9T:.-]+Z +//; s/^[A-Z]+ +[0-9]+ --- \[[^]]*\] \[[^]]*\] +//; s/ +: /: /'; }

# Start detached and block until it answers. Deliberately NOT setsid: setsid forks when it is
# not already a process-group leader, so $! would name a process that exits immediately and
# the JVM would survive every later stop_app -- holding the port, so the next scenario fails
# to bind and curl answers from the previous one. That reads exactly like the configuration
# under test having had no effect.
start_app() {
  stop_app
  mkdir -p target
  nohup java -jar "$JAR" "$@" > "$LOG" 2>&1 < /dev/null &
  echo $! > target/app.pid
  for _ in $(seq 1 60); do
    curl -s -o /dev/null "http://127.0.0.1:${APP_PORT}/tx/silent" 2>/dev/null && return 0
    kill -0 "$(cat target/app.pid)" 2>/dev/null || { echo "JVM exited during startup:"
      tail -20 "$LOG"; return 1; }
    sleep 1
  done
  echo "application did not answer"; tail -20 "$LOG"; return 1
}

# Stop by recorded PID. Never by pattern: `ps | grep transactions` also matches the shell
# running this script, because that string is on its own command line.
stop_app() {
  if [ -f target/app.pid ]; then
    pid=$(cat target/app.pid)
    if [ -n "$pid" ] && grep -qa "transactions" "/proc/$pid/cmdline" 2>/dev/null; then
      kill -9 "$pid" 2>/dev/null || true
      wait "$pid" 2>/dev/null || true
    fi
    rm -f target/app.pid
  fi
  for _ in $(seq 1 40); do
    if ! (exec 3<>/dev/tcp/127.0.0.1/"${APP_PORT}") 2>/dev/null; then break; fi
    sleep 0.25
  done
  exec 3<&- 2>/dev/null || true
}