#!/usr/bin/env bash

if [[ "$(realpath "$(dirname "$(realpath -s "$0")")/../../../")" == "/" ]]; then
    . /usr/local/libexec/zio/helpers/bash.sh
else
    . "$(dirname "$(realpath -s "$0")")/../libexec/zio/helpers/bash.sh"
fi

requested_package="$1"
tmp_path_hash="$(date +%s)"

function get_install_path() {
    install_path="/usr/local/bin/$1"

    if [[ -f "$install_path" ]] && [[ "$(file "$install_path")" != *": empty" ]]; then
        chmod +x "$install_path"
    fi

    echo "$install_path"
}

function get_name() {
    package_id="$1"
    package_name=""

    case $package_id in
        "caddy") package_name="Caddy" ;;
        *) package_name="$package_id" ;;
    esac

    echo "$package_name"
}

function get_tmp_path() {
    tmp_path="/tmp/$1_${tmp_path_hash}"

    if [[ -f "$tmp_path" ]] && [[ "$(file "$tmp_path")" != *": empty" ]]; then
        chmod +x "$tmp_path"
    fi

    echo "$tmp_path"
}

function download() {
    package_id="$1"
    url="$2"

    package_name="$(get_name "$package_id")"
    package_tmp_path="$(get_tmp_path "$package_id")"

    say info "Downloading: $package_name ($package_tmp_path)"
    wget "$url" -O "$(get_tmp_path "$package_id")"
}

function install() {
    package_id="$1"
    package_version="$2"

    package_name="$(get_name "$package_id")"

    if [[ -z "$package_version" ]]; then
        say info "Installing: $package_name ($(get_install_path "$package_id"))"
        mv "$(get_tmp_path "$package_id")" "$(get_install_path "$package_id")"
    else
        if [[ "$package_version" != "v"* ]]; then
            package_version="v$package_version"
        fi

        package_id_version="$package_id-$package_version"

        say info "Installing: $package_name $package_version ($(get_install_path "$package_id_version"))"
        rm -f "$(get_install_path "$package_id")"
        mv "$(get_tmp_path "$package_id")" "$(get_install_path "$package_id_version")"

        say info "Symlinking: $(get_install_path "$package_id_version") ➔ $(get_install_path "$package_id")"
        ln -s "$(get_install_path "$package_id_version")" "$(get_install_path "$package_id")"
    fi
}

function download_caddy() {
    package_id="caddy"

    download "caddy" "https://caddyserver.com/api/download?os=linux&arch=amd64&p=github.com%2Fcaddy-dns%2Fcloudflare"

    caddy_version="$($(get_tmp_path "$package_id") version)"
    caddy_version_array=($caddy_version)
    caddy_version="${caddy_version_array[0]}"

    install "$package_id" "$caddy_version"
}

function download_generic() {
    package_id="$requested_package"
    download "$requested_package" "$1"
    install "$requested_package"
}

test_root
test_prog "wget"

case $requested_package in
    "caddy") download_caddy ;;
    *) die "Package '$requested_package' cannot be installed by this tool" ;;
esac