#! /usr/bin/bash

set -euo pipefail
IFS=$'\n\t'

STATE_DIR="$(systemd-path user-state-private)"/github-versions
mkdir --parents "${STATE_DIR}"

github_update() {
    package="$1"
    repo="$2"
    resource="$3"
    post_fetch="$4"

    response=$(curl --silent "https://api.github.com/repos/${repo}/releases/latest")
    latest_version=$(printf '%s' "${response}" | jq --raw-output .name)
    VERSION_FILE="${STATE_DIR}/${package}"

    install="false"
    if [ -f "${VERSION_FILE}" ]; then
        installed_version=$(cat "${VERSION_FILE}")
        if [ "${installed_version}" = "${latest_version}" ]; then
            echo "Latest version \"${package} ${installed_version}\" is already installed"
        else
            echo "Upgrading \"${package} ${installed_version}\" -> \"${package} ${latest_version}\"..."
            install="true"
        fi
    else
        echo "Installing \"${package} ${latest_version}\"..."
        install="true"
    fi

    if [ "${install}" = "true" ]; then
        asset=$(printf '%s' "${response}" | jq --raw-output ".assets[] | select(.name == \"${resource}\").browser_download_url")
        curl --location "${asset}" | "${post_fetch}" && \
        echo "${latest_version}" > "${VERSION_FILE}" && \
        echo "Successfully installed \"${package} ${latest_version}\""
    fi
}

PKG_DIR="$(systemd-path user-shared)"/github-versions
if [ -d "${PKG_DIR}" ]; then
    echo "Starting iteration"
    for package in "${PKG_DIR}"/*; do
        # shellcheck source=/dev/null
        . "${package}"
    done
fi