#!/usr/bin/env bash
# Lockfile helper for doorbell build harness
# Source this from mise tasks

LOCKFILE="/tmp/doorbell-${BOARD:-esp32-32e-4}.lock"

acquire_lock() {
    if [ -f "$LOCKFILE" ]; then
        OLD_PID=$(cat "$LOCKFILE" 2>/dev/null)
        if [ -n "$OLD_PID" ] && kill -0 "$OLD_PID" 2>/dev/null; then
            if [ "${FORCE:-}" = "1" ]; then
                echo "Force: Killing existing process (PID: $OLD_PID)..."
                kill "$OLD_PID" 2>/dev/null
                sleep 1
                kill -9 "$OLD_PID" 2>/dev/null
                echo "Killed PID $OLD_PID"
            else
                echo "Error: Another instance is running (PID: $OLD_PID)"
                echo "Kill with: mise run kill BOARD=$BOARD"
                echo "Or force with: FORCE=1 mise run $TASK_NAME BOARD=$BOARD"
                return 1
            fi
        else
            echo "Stale lockfile found, removing..."
            rm -f "$LOCKFILE"
        fi
    fi
    trap 'rm -f "$LOCKFILE"' EXIT
    echo "$$" > "$LOCKFILE"
    echo "Acquired lock: $LOCKFILE (PID: $$)"
    return 0
}

release_lock() {
    rm -f "$LOCKFILE"
}

kill_locked() {
    if [ ! -f "$LOCKFILE" ]; then
        echo "No lockfile found: $LOCKFILE (nothing to kill)"
        return 0
    fi

    OLD_PID=$(cat "$LOCKFILE" 2>/dev/null)
    if [ -z "$OLD_PID" ]; then
        echo "Lockfile is empty, removing..."
        rm -f "$LOCKFILE"
        return 0
    fi

    if kill -0 "$OLD_PID" 2>/dev/null; then
        echo "Killing PID $OLD_PID..."
        kill "$OLD_PID" 2>/dev/null
        sleep 1
        if kill -0 "$OLD_PID" 2>/dev/null; then
            echo "Force killing PID $OLD_PID..."
            kill -9 "$OLD_PID" 2>/dev/null
        fi
        echo "Killed PID $OLD_PID"
    else
        echo "Process $OLD_PID not running (stale lockfile)"
    fi
    rm -f "$LOCKFILE"
    echo "Lockfile removed"
}