# Shared support for the runnable MongoDB scripts.
# This file is sourced and should not itself be executed.

gs_mongodb_die()
{
    echo "Error: $*" >&2
    exit 1
}

gs_mongodb_require_cwd()
{
    script_dir=$(CDPATH= cd -- "$(dirname -- "$0")" && pwd)
    if [ "$PWD" != "$script_dir" ]; then
        echo "This script must be run from its own directory." >&2
        echo "Expected current directory: $script_dir" >&2
        echo "Actual current directory:   $PWD" >&2
        exit 1
    fi
}

gs_mongodb_require_command()
{
    command -v "$1" >/dev/null 2>&1 ||
        gs_mongodb_die "$1 is not in PATH. Run ./INSTALL.sh and source ./SETUP.bash."
}

gs_mongodb_pid_is_running()
{
    pid_file=$1
    [ -f "$pid_file" ] || return 1

    pid=$(cat "$pid_file" 2>/dev/null) || return 1
    case "$pid" in
        ''|*[!0-9]*) return 1 ;;
    esac

    kill -0 "$pid" 2>/dev/null
}

gs_mongodb_start_guard()
{
    description=$1
    pid_file=$2

    if gs_mongodb_pid_is_running "$pid_file"; then
        echo "$description is already running with PID $(cat "$pid_file")."
        exit 0
    fi

    if [ -f "$pid_file" ]; then
        echo "Removing stale PID file: $pid_file"
        rm -f "$pid_file"
    fi
}

gs_mongodb_stop_pidfile()
{
    description=$1
    pid_file=$2
    timeout=${3:-60}

    if ! gs_mongodb_pid_is_running "$pid_file"; then
        echo "$description is not running."
        rm -f "$pid_file"
        return 0
    fi

    pid=$(cat "$pid_file")
    echo "Stopping $description (PID $pid) ..."
    kill -TERM "$pid"

    elapsed=0
    while kill -0 "$pid" 2>/dev/null; do
        if [ "$elapsed" -ge "$timeout" ]; then
            echo "$description did not stop within ${timeout}s." >&2
            echo "PID $pid has been left running; SIGKILL was not sent." >&2
            return 1
        fi
        sleep 1
        elapsed=$((elapsed + 1))
    done

    rm -f "$pid_file"
    echo "$description stopped."
}

gs_mongodb_require_cwd

GS_MONGODB_SETUP_QUIET_PREVIOUS=${GS_MONGODB_SETUP_QUIET-__unset__}
GS_MONGODB_SETUP_QUIET=1
. ./SETUP.bash
if [ "$GS_MONGODB_SETUP_QUIET_PREVIOUS" = "__unset__" ]; then
    unset GS_MONGODB_SETUP_QUIET
else
    GS_MONGODB_SETUP_QUIET=$GS_MONGODB_SETUP_QUIET_PREVIOUS
fi
unset GS_MONGODB_SETUP_QUIET_PREVIOUS