#!/bin/sh

set -e
IFS=$'\n\t'

function print_golang_args() {
    GOLANG_VERSION=$1

    case "$GOLANG_VERSION" in
        1.8)
            GOLANG_DOWNLOAD_SHA256=253ab94104ee3923e228a2cb2116e5e462ad3ebaeea06ff04463479d7f12d27ca
            ;;
        *) echo "Unknown golang version $1"; exit 1;
    esac

    printf -- "--build-arg GOLANG_VERSION=%s " "$GOLANG_VERSION"
    printf -- "--build-arg GOLANG_DOWNLOAD_SHA256=%s " "$GOLANG_DOWNLOAD_SHA256"
}

function print_chrome_args() {
    case "$1" in
        60|60.0) CHROME_VERSION=60.0.3112.90-1 ;;
        61|61.0) CHROME_VERSION=61.0.3163.91-1 ;;
        *) echo "Unknown chrome version $1"; exit 1;
    esac
    printf -- "--build-arg CHROME_VERSION=%s " "$CHROME_VERSION"
}

function print_git_args() {
    case "$1" in
        2.7)
            # Code-debt: When the build refers to "git 2.7" its actually "default" git.
            # so don't actually install a git 2.7 as a default copy is already installed
            return
            ;;
        2.8|2.8.4)
            GIT_VERSION=2.8.4
            GIT_DOWNLOAD_SHA256=626e319f8a24fc0866167ea5f6bf3e2f38f69d6cb2e59e150f13709ca3ebf301
            ;;
        2.13)
            GIT_VERSION=2.13.0
            GIT_DOWNLOAD_SHA256=9f2fa8040ebafc0c2caae4a9e2cb385c6f16c0525bcb0fbd84938bc796372e80
            ;;
        *) echo "Unknown git version $1"; exit 1;
    esac

    printf -- "--build-arg GIT_VERSION=%s " "$GIT_VERSION"
    printf -- "--build-arg GIT_DOWNLOAD_SHA256=%s " "$GIT_DOWNLOAD_SHA256"
}

function print_phantomjs_args() {
    case "$1" in
        2.1) PHANTOMJS_VERSION=2.1.1 ;;
        *) echo "Unknown phantomjs version $1"; exit 1;
    esac
    printf -- "--build-arg PHANTOMJS_VERSION=%s " "$PHANTOMJS_VERSION"
}

function print_node_args() {
    case "$1" in
        7.1) NODE_VERSION=7.x ;;
        *) echo "Unknown node version $1"; exit 1;
    esac
    printf -- "--build-arg NODE_VERSION=%s " "$NODE_VERSION"
}

function print_postgres_args() {
    printf -- "--build-arg POSTGRES_VERSION=%s " "$1"
}

function parse_arguments() {
    read base
    read base_version
    printf -- "-f Dockerfile.custom " "$base"
    printf -- "--build-arg CUSTOM_IMAGE_NAME=%s " "$base"
    printf -- "--build-arg CUSTOM_IMAGE_VERSION=%s " "$base_version"
    while read image; do
        read version
        case "$image" in
            golang) print_golang_args $version ;;
            chrome) print_chrome_args $version ;;
            git) print_git_args $version ;;
            phantomjs) print_phantomjs_args $version ;;
            node) print_node_args $version ;;
            postgresql) print_postgres_args $version ;;
            *) exit 1;;
        esac
    done
}

function generate_command() {
    buildimage_name=$1; shift;

    printf -- "docker build "
    echo $buildimage_name | tr '-' '\n' | parse_arguments

    for i in "$@"
    do
        printf -- "%s " "$i"
    done
    printf -- ".\\n"
}

docker_command=$(generate_command $@)
echo "$1: executing $docker_command"
eval $docker_command