class RubyLsp::DependencyDetector

def dependencies
  @dependencies ||= T.let(
    begin
      Bundler.with_original_env { Bundler.default_gemfile }
      Bundler.locked_gems.dependencies.keys + gemspec_dependencies
    rescue Bundler::GemfileNotFound
      []
    end,
    T.nilable(T::Array[String]),
  )
end

def detect_formatter
  # NOTE: Intentionally no $ at end, since we want to match rubocop-shopify, etc.
  if direct_dependency?(/^rubocop/)
    "rubocop"
  elsif direct_dependency?(/^syntax_tree$/)
    "syntax_tree"
  else
    "none"
  end
end

def detect_test_library
  # A Rails app may have a dependency on minitest, but we would instead want to use the Rails test runner provided
  # by ruby-lsp-rails.
  if direct_dependency?(/^rails$/)
    "rails"
  # NOTE: Intentionally ends with $ to avoid mis-matching minitest-reporters, etc. in a Rails app.
  elsif direct_dependency?(/^minitest$/)
    "minitest"
  elsif direct_dependency?(/^test-unit/)
    "test-unit"
  elsif direct_dependency?(/^rspec/)
    "rspec"
  else
    "unknown"
  end
end

def detect_typechecker
  return false if ENV["RUBY_LSP_BYPASS_TYPECHECKER"]
  Bundler.with_original_env do
    Bundler.locked_gems.specs.any? { |spec| spec.name == "sorbet-static" }
  end
rescue Bundler::GemfileNotFound
  false
end

def direct_dependency?(gem_pattern)
  dependencies.any?(gem_pattern)
end

def gemspec_dependencies
  Bundler.locked_gems.sources
    .grep(Bundler::Source::Gemspec)
    .flat_map { _1.gemspec&.dependencies&.map(&:name) }
end

def initialize
  @detected_formatter = T.let(detect_formatter, String)
  @detected_test_library = T.let(detect_test_library, String)
  @typechecker = T.let(detect_typechecker, T::Boolean)
end