#!/bin/sh
set -e

FORMIDABLE_RELEASES_URL="https://github.com/Bornholm/formidable/releases"
FORMIDABLE_DESTDIR="."
FORMIDABLE_FILE_BASENAME="frmd"

function main {
    test -z "$FORMIDABLE_VERSION" && FORMIDABLE_VERSION="$(curl -sfL -o /dev/null -w %{url_effective} "$FORMIDABLE_RELEASES_URL/latest" |
        rev |
        cut -f1 -d'/'|
        rev)"

    # Check version variable initialization
    test -z "$FORMIDABLE_VERSION" && {
        echo "Unable to get Formidable version !" >&2
        exit 1
    }

    test -z "$FORMIDABLE_TMPDIR" && FORMIDABLE_TMPDIR="$(mktemp -d)"
    export TAR_FILE="$FORMIDABLE_TMPDIR/${FILE_BASENAME}_$(uname -s)_$(uname -m).tar.gz"

    (
        cd "$FORMIDABLE_TMPDIR"

        # Download Formidable
        echo "Downloading Formidable $FORMIDABLE_VERSION..."
        curl -sfLo "$TAR_FILE" \
            "$FORMIDABLE_RELEASES_URL/download/$FORMIDABLE_VERSION/${FORMIDABLE_FILE_BASENAME}_$(uname -s)_$(uname -m).tar.gz" ||
            ( echo  "Error while downloading Formidable !" >&2 && exit 1 )
        
        # Download checksums
        curl -sfLo "checksums.txt" "$FORMIDABLE_RELEASES_URL/download/$FORMIDABLE_VERSION/checksums.txt"
        
        echo "Verifying checksums..."
        sha256sum --ignore-missing --quiet --check checksums.txt ||
            ( echo  "Error while verifying checksums !" >&2 && exit 1 )
    )

    # Extracting archive files
    tar -xf "$TAR_FILE" -C "$FORMIDABLE_TMPDIR"

    # Moving downloaded binary to destination directory
    mv -f "$FORMIDABLE_TMPDIR/$FORMIDABLE_FILE_BASENAME" "$FORMIDABLE_DESTDIR/"
}

main $@