#!/usr/bin/env nix-shell
#! nix-shell -i oil -p jq sd nix-prefetch-github ripgrep moreutils

# TODO set to `verbose` or `extdebug` once implemented in oil
shopt --set xtrace

var directory = $(dirname $0 | xargs realpath)
var owner = "LemmyNet"
var ui_repo = "lemmy-ui"
var server_repo = "lemmy"
var latest_rev = $(curl -q https://api.github.com/repos/${owner}/${server_repo}/releases/latest | \
  jq -r '.tag_name')
var latest_version = $(echo $latest_rev)
var current_version = $(jq -r '.version' $directory/pin.json)
if ($latest_version === $current_version) {
  echo "lemmy is already up-to-date"
  return 0
} else {
  # for some strange reason, hydra fails on reading upstream package.json directly
  var source = "https://raw.githubusercontent.com/$owner/$ui_repo/$latest_version"
  var package_json = "$(curl -qf $source/package.json)"
  echo $package_json > $directory/package.json

  var server_tarball_meta = $(nix-prefetch-github $owner $server_repo --rev "$latest_rev")
  var server_tarball_hash = "sha256-$(echo $server_tarball_meta | jq -r '.sha256')"
  var ui_tarball_meta = $(nix-prefetch-github $owner $ui_repo --rev "$latest_rev")
  var ui_tarball_hash = "sha256-$(echo $ui_tarball_meta | jq -r '.sha256')"

  jq ".version = \"$latest_version\" | \
      .\"serverSha256\" = \"$server_tarball_hash\" | \
      .\"uiSha256\" = \"$ui_tarball_hash\" | \
      .\"serverCargoSha256\" = \"\" | \
      .\"uiYarnDepsSha256\" = \"\"" $directory/pin.json | sponge $directory/pin.json

  var new_cargo_sha256 = $(nix-build -A lemmy-server 2>&1 | \
    tail -n 2 | \
    head -n 1 | \
    sd '\s+got:\s+' '')

  var new_offline_cache_sha256 = $(nix-build -A lemmy-ui 2>&1 | \
    tail -n 2 | \
    head -n 1 | \
    sd '\s+got:\s+' '')

  jq ".\"serverCargoSha256\" = \"$new_cargo_sha256\" | \
      .\"uiYarnDepsSha256\" = \"$new_offline_cache_sha256\"" \
    $directory/pin.json | sponge $directory/pin.json
}