#!/usr/bin/env bash

print_usage()
{
    echo "USAGE: $0 <slim|full> [rust version] [cross version]"
    echo
    echo "Arguments:"
    echo -e "\t<slim|full>\tSlim build (without targets) or Full build (with targets)"
    echo -e "\t[rust version]\tVersion of rust (https://github.com/rust-lang/rust)"
    echo -e "\t[cross version]\tVersion of cross (https://github.com/cross-rs/cross)"
    echo
    echo "Both versions default to the latest version."
}

get_latest_release() {
  curl --silent "https://api.github.com/repos/$1/releases/latest" | # Get latest release from GitHub api
    grep '"tag_name":' |                                            # Get tag line
    sed -E 's/.*"v?([^"]+)".*/\1/'                                  # Pluck JSON value
}


if command -v podman &> /dev/null
then
    BUILDER=podman
elif command -v docker &> /dev/null
then
    BUILDER=docker
else
    echo "Prerequisite failed: either podman or docker must be installed"
    exit 1
fi

if ! command -v envsubst &> /dev/null
then
    echo "Prerequisite failed: envsubst must be installed"
    exit 1
fi

if [ $# -lt 1 ]; then
    print_usage
    exit 1
fi

case ${1} in
    full | slim)
        ;;

    *)
        echo "ERROR: The first argument mus either be 'full' or 'slim'."
        echo
        print_usage
        exit 1
        ;;
esac

set -e -o pipefail

if [ -z "$2" ]; then
    RUST_VERSION=$(get_latest_release 'rust-lang/rust')
else
    RUST_VERSION=$2
fi

if [ -z "$3" ]; then
    CROSS_VERSION=$(get_latest_release 'cross-rs/cross')
else
    CROSS_VERSION=$3
fi

echo "Creating a ${1} build with Rust ${RUST_VERSION} and cross ${CROSS_VERSION}"

export RUST_VERSION
export CROSS_VERSION

IMAGE="img.kie.rs/jjkiers/rust-dind-cross:rust${RUST_VERSION}-cross${CROSS_VERSION}-${1}"

envsubst < Dockerfile-${1} | ${BUILDER} build -f - \
    -t ${IMAGE} \
    .

echo "Built image ${IMAGE}"

${BUILDER} push ${IMAGE}

echo "Pushed image ${IMAGE}"