#!/bin/bash

# Get the script's real directory, whether we're being called directly or via a symlink
if [ -L "$0" ]; then
    export SCRIPT_DIR=$(dirname $(readlink "$0"))
else
    export SCRIPT_DIR=$(dirname "$0")
fi

# Load all scriptlets
cd "$SCRIPT_DIR"
for lib in lib/*.sh; do
    . $lib
done

TRAINER_IMAGE="preparevms_prepare-vms"

DEPENDENCIES="
    aws
    ssh
    curl
    jq
    pssh
    wkhtmltopdf
    man
    "

ENVVARS="
    AWS_ACCESS_KEY_ID
    AWS_SECRET_ACCESS_KEY
    AWS_DEFAULT_REGION
    SSH_AUTH_SOCK
    "

check_envvars() {
    status=0
    for envvar in $ENVVARS; do
        if [ -z "${!envvar}" ]; then
            error "Environment variable $envvar is not set."
            if [ "$envvar" = "SSH_AUTH_SOCK" ]; then
                error "Hint: run '\$(ssh-agent) ; ssh-add' and try again?"
            fi
            status=1
        fi
    done
    return $status
}

check_dependencies() {
    status=0
    for dependency in $DEPENDENCIES; do
        if ! command -v $dependency >/dev/null; then
            warning "Dependency $dependency could not be found."
            status=1
        fi
    done
    return $status
}

check_image() {
    docker inspect $TRAINER_IMAGE >/dev/null 2>&1
}

check_envvars \
    || die "Please set all required environment variables."

check_dependencies \
    || warning "At least one dependency is missing. Install it or try the image wrapper."

# Now check which command was invoked and execute it
if [ "$1" ]; then
    cmd="$1"
    shift
else
    cmd=help
fi
fun=_cmd_$cmd
type -t $fun | grep -q function || die "Invalid command: $cmd"
$fun "$@"

#    export SSH_AUTH_DIRNAME=$(dirname $SSH_AUTH_SOCK)
#    docker-compose run prepare-vms "$@"