require_relative 'constants'
require_relative 'package'

# Require extensions to CocoaPods' classes
require_relative 'cocoapods/pod_target'
require_relative 'cocoapods/sandbox'
require_relative 'cocoapods/target_definition'
require_relative 'cocoapods/umbrella_header_generator'
require_relative 'cocoapods/user_project_integrator'

module Expo
  class AutolinkingManager
    require 'colored2'
    include Pod

    public def initialize(podfile, target_definition, options)
      @podfile = podfile
      @target_definition = target_definition
      @options = options
      @packages = resolve()['modules'].map { |json_package| Package.new(json_package) }
    end

    public def use_expo_modules!
      if has_packages?
        return
      end

      global_flags = @options.fetch(:flags, {})
      tests_only = @options.fetch(:testsOnly, false)
      include_tests = @options.fetch(:includeTests, false)

      project_directory = Pod::Config.instance.project_root

      UI.section 'Using Expo modules' do
        @packages.each { |package|
          package.pods.each { |pod|
            # The module can already be added to the target, in which case we can just skip it.
            # This allows us to add a pod before `use_expo_modules` to provide custom flags.
            if @target_definition.dependencies.any? { |dependency| dependency.name == pod.pod_name }
              UI.message '— ' << package.name.green << ' is already added to the target'.yellow
              next
            end

            podspec_dir_path = Pathname.new(pod.podspec_dir).relative_path_from(project_directory).to_path

            # Ensure that the dependencies of packages with Swift code use modular headers, otherwise
            # `pod install` may fail if there is no `use_modular_headers!` declaration or
            # `:modular_headers => true` is not used for this particular dependency.
            # The latter require adding transitive dependencies to user's Podfile that we'd rather like to avoid.
            if package.has_swift_modules_to_link?
              podspec = get_podspec_for_pod(pod)
              use_modular_headers_for_dependencies(podspec.all_dependencies)
            end

            pod_options = {
              :path => podspec_dir_path,
              :configuration => package.debugOnly ? ['Debug'] : [] # An empty array means all configurations
            }.merge(global_flags, package.flags)

            if tests_only || include_tests
              podspec = podspec || get_podspec_for_pod(pod)
              test_specs_names = podspec.test_specs.map { |test_spec|
                test_spec.name.delete_prefix(podspec.name + "/")
              }

              # Jump to the next package when it doesn't have any test specs (except interfaces, they're required)
              # TODO: Can remove interface check once we move all the interfaces into the core.
              next if tests_only && test_specs_names.empty? && !pod.pod_name.end_with?('Interface')

              pod_options[:testspecs] = test_specs_names
            end

            # Install the pod.
            @podfile.pod(pod.pod_name, pod_options)

            # TODO: Can remove this once we move all the interfaces into the core.
            next if pod.pod_name.end_with?('Interface')

            UI.message "— #{package.name.green} (#{package.version})"
          }
        }
      end
      self
    end

    # Spawns `expo-module-autolinking generate-package-list` command.
    public def generate_package_list(target_name, target_path)
      Process.wait IO.popen(generate_package_list_command_args(target_path)).pid
    end

    # If there is any package to autolink.
    public def has_packages?
      @packages.empty?
    end

    # Filters only these packages that needs to be included in the generated modules provider.
    public def packages_to_generate
      @packages.select { |package| package.modules.any? }
    end

    # Returns the provider name which is also a name of the generated file
    public def modules_provider_name
      @options.fetch(:providerName, Constants::MODULES_PROVIDER_FILE_NAME)
    end

    # For now there is no need to generate the modules provider for testing.
    public def should_generate_modules_provider?
      return !@options.fetch(:testsOnly, false)
    end

    # privates

    private def resolve
      json = []

      IO.popen(resolve_command_args) do |data|
        while line = data.gets
          json << line
        end
      end

      begin
        JSON.parse(json.join())
      rescue => error
        raise "Couldn't parse JSON coming from `expo-modules-autolinking` command:\n#{error}"
      end
    end

    private def node_command_args(command_name)
      search_paths = @options.fetch(:searchPaths, @options.fetch(:modules_paths, nil))
      ignore_paths = @options.fetch(:ignorePaths, nil)
      exclude = @options.fetch(:exclude, [])

      args = [
        'node',
        '--eval',
        'require(\'expo-modules-autolinking\')(process.argv.slice(1))',
        command_name,
        '--platform',
        'ios'
      ]

      if !search_paths.nil? && !search_paths.empty?
        args.concat(search_paths)
      end

      if !ignore_paths.nil? && !ignore_paths.empty?
        args.concat(['--ignore-paths'], ignore_paths)
      end

      if !exclude.nil? && !exclude.empty?
        args.concat(['--exclude'], exclude)
      end

      args
    end

    private def resolve_command_args
      node_command_args('resolve').concat(['--json'])
    end

    private def generate_package_list_command_args(target_path)
      node_command_args('generate-package-list').concat([
        '--target',
        target_path
      ])
    end

    private def get_podspec_for_pod(pod)
      podspec_file_path = File.join(pod.podspec_dir, pod.pod_name + ".podspec")
      return Pod::Specification.from_file(podspec_file_path)
    end

    private def use_modular_headers_for_dependencies(dependencies)
      dependencies.each { |dependency|
        # The dependency name might be a subspec like `ReactCommon/turbomodule/core`,
        # but the modular headers need to be enabled for the entire `ReactCommon` spec anyway,
        # so we're stripping the subspec path from the dependency name.
        root_spec_name = dependency.name.partition('/').first

        unless @target_definition.build_pod_as_module?(root_spec_name)
          UI.info "[Expo] ".blue << "Enabling modular headers for pod #{root_spec_name.green}"

          # This is an equivalent to setting `:modular_headers => true` for the specific dependency.
          @target_definition.set_use_modular_headers_for_pod(root_spec_name, true)
        end
      }
    end

  end # class AutolinkingManager
end # module Expo