# typed: strict
# frozen_string_literal: true

require "utils/curl"

# Repology API client.
module Repology
  HOMEBREW_CORE = "homebrew"
  HOMEBREW_CASK = "homebrew_casks"
  MAX_PAGINATION = 15
  private_constant :MAX_PAGINATION

  sig { params(last_package_in_response: T.nilable(String), repository: String).returns(T::Hash[String, T.untyped]) }
  def self.query_api(last_package_in_response = "", repository:)
    last_package_in_response += "/" if last_package_in_response.present?
    url = "https://repology.org/api/v1/projects/#{last_package_in_response}?inrepo=#{repository}&outdated=1"

    result = Utils::Curl.curl_output(
      "--silent", url.to_s,
      use_homebrew_curl: !Utils::Curl.curl_supports_tls13?
    )
    JSON.parse(result.stdout)
  rescue
    if Homebrew::EnvConfig.developer?
      $stderr.puts result&.stderr
    else
      odebug result&.stderr
    end

    raise
  end

  sig { params(name: String, repository: String).returns(T.nilable(T::Hash[String, T.untyped])) }
  def self.single_package_query(name, repository:)
    url = "https://repology.org/api/v1/project/#{name}"

    result = Utils::Curl.curl_output(
      "--location", "--silent", url.to_s,
      use_homebrew_curl: !Utils::Curl.curl_supports_tls13?
    )

    data = JSON.parse(result.stdout)
    { name => data }
  rescue => e
    require "utils/backtrace"
    error_output = [result&.stderr, "#{e.class}: #{e}", Utils::Backtrace.clean(e)].compact
    if Homebrew::EnvConfig.developer?
      $stderr.puts(*error_output)
    else
      odebug(*error_output)
    end

    nil
  end

  sig {
    params(
      limit:        T.nilable(Integer),
      last_package: T.nilable(String),
      repository:   String,
    ).returns(T::Hash[String, T.untyped])
  }
  def self.parse_api_response(limit = nil, last_package = "", repository:)
    package_term = case repository
    when HOMEBREW_CORE
      "formulae"
    when HOMEBREW_CASK
      "casks"
    else
      "packages"
    end

    ohai "Querying outdated #{package_term} from Repology"

    page_no = 1
    outdated_packages = {}

    while page_no <= MAX_PAGINATION
      odebug "Paginating Repology API page: #{page_no}"

      response = query_api(last_package, repository:)
      outdated_packages.merge!(response)
      last_package = response.keys.max

      page_no += 1
      break if (limit && outdated_packages.size >= limit) || response.size <= 1
    end

    package_term = package_term.chop if outdated_packages.size == 1
    puts "#{outdated_packages.size} outdated #{package_term} found"
    puts

    outdated_packages.sort.to_h
  end

  sig { params(repositories: T::Array[String]).returns(T.any(String, Version)) }
  def self.latest_version(repositories)
    # The status is "unique" when the package is present only in Homebrew, so
    # Repology has no way of knowing if the package is up-to-date.
    is_unique = repositories.find do |repo|
      repo["status"] == "unique"
    end.present?

    return "present only in Homebrew" if is_unique

    latest_version = repositories.find do |repo|
      repo["status"] == "newest"
    end

    # Repology cannot identify "newest" versions for packages without a version
    # scheme
    return "no latest version" if latest_version.blank?

    Version.new(T.must(latest_version["version"]))
  end
end