# typed: strict
# frozen_string_literal: true

require "download_strategy"
require "utils/github"

module GitHub
  # Download an artifact from GitHub Actions and unpack it into the current working directory.
  #
  # @param url [String] URL to download from
  # @param artifact_id [String] a value that uniquely identifies the downloaded artifact
  sig { params(url: String, artifact_id: String).void }
  def self.download_artifact(url, artifact_id)
    token = API.credentials
    raise API::MissingAuthenticationError if token.blank?

    # We use a download strategy here to leverage the Homebrew cache
    # to avoid repeated downloads of (possibly large) bottles.
    downloader = GitHubArtifactDownloadStrategy.new(url, artifact_id, token:)
    downloader.fetch
    downloader.stage
  end
end

# Strategy for downloading an artifact from GitHub Actions.
class GitHubArtifactDownloadStrategy < AbstractFileDownloadStrategy
  sig { params(url: String, artifact_id: String, token: String).void }
  def initialize(url, artifact_id, token:)
    super(url, "artifact", artifact_id)
    @cache = T.let(HOMEBREW_CACHE/"gh-actions-artifact", Pathname)
    @token = T.let(token, String)
  end

  sig { override.params(timeout: T.any(Float, Integer, NilClass)).void }
  def fetch(timeout: nil)
    ohai "Downloading #{url}"
    if cached_location.exist?
      puts "Already downloaded: #{cached_location}"
    else
      begin
        Utils::Curl.curl("--location", "--create-dirs", "--output", temporary_path.to_s, url,
                         "--header", "Authorization: token #{@token}",
                         secrets: [@token],
                         timeout:)
      rescue ErrorDuringExecution
        raise CurlDownloadStrategyError, url
      end
      cached_location.dirname.mkpath
      temporary_path.rename(cached_location.to_s)
    end

    symlink_location.dirname.mkpath
    FileUtils.ln_s cached_location.relative_path_from(symlink_location.dirname), symlink_location, force: true
  end

  private

  sig { returns(String) }
  def resolved_basename
    "artifact.zip"
  end
end