#!/bin/bash

# usage
# downloadgithubasset.sh mozilla/sops
# downloadgithubasset.sh mozilla/sops 3.4.0

if ! [ -x "$(command -v jq)" ]; then
        echo 'Error: jq is not installed.' >&2
        exit 1
fi

if [ -z "$1" ]; then
        echo 'No argument supplied, you must specify a github repo' >&2
        exit 1
fi

release=${2:-latest}

if [ "$release" == "latest" ]; then
        url="https://api.github.com/repos/$1/releases/$release"
else
        url="https://api.github.com/repos/$1/releases/tags/$release"
fi

details=$(curl -s "$url")

tagname=$(echo "$details" | jq -r '.tag_name')

if [ "$tagname" == "null" ]; then
        echo 'bad URL' >&2
        exit 1
fi

echo "tag: $tagname"

# -c for multi line compressed output
# -r for raw output

assets=$(echo "$details" | jq -c '.assets[]')

names=($(echo "$assets" | jq -cr '.name'))

downloads=($(echo "$assets" | jq -cr '.browser_download_url'))

select name in "${names[@]}"; do
        if [[ ! -z "$name" ]]; then
                download=$((REPLY - 1))
                wget "${downloads[download]}"
        fi
        break
done