#!/usr/bin/env bash

set -euxo pipefail

IMAGE_TYPE="${1:-ubuntu}"
PACKER_IMAGE_NAME="bladerunner/packer:latest"
PACKER_BUILD_FILE=

errmsg () {
    echo "$@" > /dev/stderr
}

preflight () {
    case "${IMAGE_TYPE}" in 
    ubuntu) PACKER_BUILD_FILE="boards/raspberry-pi-4/ubuntu_server_20.04_arm64.json" ;;
    raspbian) PACKER_BUILD_FILE="boards/raspberry-pi/raspios-lite-arm.json" ;;
    custom)
        PACKER_BUILD_FILE="${2:-}"
        if [ -z "${PACKER_BUILD_FILE}" ]
        then
            errmsg "[!] custom board requires a board file path"
            exit 1
        fi
        ;;
    *)
        errmsg "[!] invalid image type ${IMAGE_TYPE}."
        errmsg "[!] valid image types are"
        errmsg "    - raspbian"
        errmsg "    - ubuntu"
        errmsg "    - custom path/to/board/file"
        exit 1
        ;;
    esac

    if [ -z "$(docker image ls -q ${PACKER_IMAGE_NAME})" ]
    then
        docker image build -t "${PACKER_IMAGE_NAME}" .
    fi

}

run_image () {
    # privileged is required for loopback devices
    docker run --privileged=true -i -t -v build:/packer/build -v /dev:/dev ${PACKER_IMAGE_NAME} -c "packer build ${PACKER_BUILD_FILE}"
}

preflight
run_image