#!/usr/bin/env nix-shell
#!nix-shell -i bash -p gh
# shellcheck shell=bash
# Bash 3 compatible for Darwin

if [ -z "${GITHUB_TOKEN}" ]; then
  echo >&2 "usage: GITHUB_TOKEN=… ./update.sh"
  exit 1
fi

# Version of Pulumi from
# https://www.pulumi.com/docs/get-started/install/versions/
VERSION="3.28.0"

# An array of plugin names. The respective repository inside Pulumi's
# Github organization is called pulumi-$name by convention.

declare -a pulumi_repos
pulumi_repos=(
  "aiven"
  "akamai"
  "alicloud"
  "artifactory"
  "auth0"
  "aws"
  "azure"
  "azuread"
  "azuredevops"
  "cloudflare"
  "consul"
  "datadog"
  "digitalocean"
  "docker"
  "equinix-metal"
  "fastly"
  "gcp"
  "github"
  "gitlab"
  "google-native"
  "hcloud"
  "kubernetes"
  "linode"
  "mailgun"
  "mysql"
  "openstack"
  "postgresql"
  "random"
  "snowflake"
  "spotinst"
  "sumologic"
  "tailscale"
  "tls"
  "vault"
  "venafi"
  "vsphere"
  "wavefront"
  "yandex"
)

# Contains latest release ${VERSION} from
# https://github.com/pulumi/pulumi-${NAME}/releases

# Dynamically builds the plugin array, using the GitHub API for getting the
# latest version.
plugin_num=1
plugins=()
for key in "${pulumi_repos[@]}"; do
  plugin="${key}=$(gh api "repos/pulumi/pulumi-${key}/releases/latest" --jq '.tag_name | sub("^v"; "")')"
  printf "%20s: %s of %s\r" "${plugin}" "${plugin_num}" "${#pulumi_repos[@]}"
  plugins+=("${plugin}")
  sleep 1
  ((++plugin_num))
done
printf "\n"

function genMainSrc() {
  local url="https://get.pulumi.com/releases/sdk/pulumi-v${VERSION}-${1}-${2}.tar.gz"
  local sha256
  sha256=$(nix-prefetch-url "$url")
  echo "      {"
  echo "        url = \"${url}\";"
  echo "        sha256 = \"$sha256\";"
  echo "      }"
}

function genSrc() {
  local url="${1}"
  local plug="${2}"
  local tmpdir="${3}"

  local sha256
  sha256=$(nix-prefetch-url "$url")

  {
    if [ -n "$sha256" ]; then # file exists
      echo "      {"
      echo "        url = \"${url}\";"
      echo "        sha256 = \"$sha256\";"
      echo "      }"
    else
      echo "      # pulumi-resource-${plug} skipped (does not exist on remote)"
    fi
  } > "${tmpdir}/${plug}.nix"
}

function genSrcs() {
  local tmpdir
  tmpdir="$(mktemp -d)"

  local i=0

  for plugVers in "${plugins[@]}"; do
    local plug=${plugVers%=*}
    local version=${plugVers#*=}
    # url as defined here
    # https://github.com/pulumi/pulumi/blob/06d4dde8898b2a0de2c3c7ff8e45f97495b89d82/pkg/workspace/plugins.go#L197
    local url="https://api.pulumi.com/releases/plugins/pulumi-resource-${plug}-v${version}-${1}-${2}.tar.gz"
    genSrc "${url}" "${plug}" "${tmpdir}" &
    ((++i))
  done

  wait

  find "${tmpdir}" -name '*.nix' -print0 | sort -z | xargs -r0 cat
  rm -r "${tmpdir}"
}

{
  cat << EOF
# DO NOT EDIT! This file is generated automatically by update.sh
{ }:
{
  version = "${VERSION}";
  pulumiPkgs = {
EOF

  echo "    x86_64-linux = ["
  genMainSrc "linux" "x64"
  genSrcs "linux" "amd64"
  echo "    ];"

  echo "    x86_64-darwin = ["
  genMainSrc "darwin" "x64"
  genSrcs "darwin" "amd64"
  echo "    ];"

  echo "    aarch64-linux = ["
  genMainSrc "linux" "arm64"
  genSrcs "linux" "arm64"
  echo "    ];"

  echo "    aarch64-darwin = ["
  genMainSrc "darwin" "arm64"
  genSrcs "darwin" "arm64"
  echo "    ];"

  echo "  };"
  echo "}"

} > data.nix