require "forwardable"

module Suspenders
  class AppBuilder < Rails::AppBuilder
    include Suspenders::Actions
    extend Forwardable

    def_delegators(
      :heroku_adapter,
      :create_heroku_application_manifest_file,
      :create_heroku_pipeline,
      :create_production_heroku_app,
      :create_review_apps_setup_script,
      :create_staging_heroku_app,
      :set_heroku_application_host,
      :set_heroku_backup_schedule,
      :set_heroku_honeybadger_env,
      :set_heroku_rails_secrets,
      :set_heroku_remotes,
    )

    def readme
      template 'README.md.erb', 'README.md'
    end

    def gitignore
      copy_file "suspenders_gitignore", ".gitignore"
    end

    def gemfile
      template "Gemfile.erb", "Gemfile"
    end

    def setup_rack_mini_profiler
      copy_file(
        "rack_mini_profiler.rb",
        "config/initializers/rack_mini_profiler.rb",
      )
    end

    def raise_on_missing_assets_in_test
      configure_environment "test", "config.assets.raise_runtime_errors = true"
    end

    def raise_on_delivery_errors
      replace_in_file 'config/environments/development.rb',
        'raise_delivery_errors = false', 'raise_delivery_errors = true'
    end

    def set_test_delivery_method
      inject_into_file(
        "config/environments/development.rb",
        "\n  config.action_mailer.delivery_method = :file",
        after: "config.action_mailer.raise_delivery_errors = true",
      )
    end

    def raise_on_unpermitted_parameters
      config = <<-RUBY
    config.action_controller.action_on_unpermitted_parameters = :raise
      RUBY

      inject_into_class "config/application.rb", "Application", config
    end

    def configure_quiet_assets
      config = <<-RUBY
    config.assets.quiet = true
      RUBY

      inject_into_class "config/application.rb", "Application", config
    end

    def provide_setup_script
      template "bin_setup", "bin/setup", force: true
      run "chmod a+x bin/setup"
    end

    def configure_generators
      config = <<-RUBY

    config.generators do |generate|
      generate.helper false
      generate.javascripts false
      generate.request_specs false
      generate.routing_specs false
      generate.stylesheets false
      generate.test_framework :rspec
      generate.view_specs false
    end

      RUBY

      inject_into_class 'config/application.rb', 'Application', config
    end

    def configure_local_mail
      copy_file "email.rb", "config/initializers/email.rb"
    end

    def enable_rack_canonical_host
      config = <<-RUBY

  if ENV.fetch("HEROKU_APP_NAME", "").include?("staging-pr-")
    ENV["APPLICATION_HOST"] = ENV["HEROKU_APP_NAME"] + ".herokuapp.com"
  end

  config.middleware.use Rack::CanonicalHost, ENV.fetch("APPLICATION_HOST")
      RUBY

      configure_environment "production", config
    end

    def enable_rack_deflater
      configure_environment "production", "config.middleware.use Rack::Deflater"
    end

    def setup_asset_host
      replace_in_file 'config/environments/production.rb',
        "# config.action_controller.asset_host = 'http://assets.example.com'",
        'config.action_controller.asset_host = ENV.fetch("ASSET_HOST", ENV.fetch("APPLICATION_HOST"))'

      if File.exist?("config/initializers/assets.rb")
        replace_in_file 'config/initializers/assets.rb',
          "config.assets.version = '1.0'",
          'config.assets.version = (ENV["ASSETS_VERSION"] || "1.0")'
      end

      config = <<-EOD
config.public_file_server.headers = {
    "Cache-Control" => "public, max-age=31557600",
  }
      EOD

      configure_environment("production", config)
    end

    def setup_secret_token
      template 'secrets.yml', 'config/secrets.yml', force: true
    end

    def disallow_wrapping_parameters
      remove_file "config/initializers/wrap_parameters.rb"
    end

    def use_postgres_config_template
      template 'postgresql_database.yml.erb', 'config/database.yml',
        force: true
    end

    def create_database
      bundle_command "exec rails db:create db:migrate"
    end

    def replace_gemfile(path)
      template 'Gemfile.erb', 'Gemfile', force: true do |content|
        if path
          content.gsub(%r{gem .suspenders.}) { |s| %{#{s}, path: "#{path}"} }
        else
          content
        end
      end
    end

    def ruby_version
      create_file '.ruby-version', "#{Suspenders::RUBY_VERSION}\n"
    end

    def configure_i18n_for_missing_translations
      raise_on_missing_translations_in("development")
      raise_on_missing_translations_in("test")
    end

    def configure_action_mailer_in_specs
      copy_file 'action_mailer.rb', 'spec/support/action_mailer.rb'
    end

    def configure_time_formats
      remove_file "config/locales/en.yml"
      template "config_locales_en.yml.erb", "config/locales/en.yml"
    end

    def configure_action_mailer
      action_mailer_host "development", %{"localhost:3000"}
      action_mailer_asset_host "development", %{"http://localhost:3000"}
      action_mailer_host "test", %{"www.example.com"}
      action_mailer_asset_host "test", %{"http://www.example.com"}
      action_mailer_host "production", %{ENV.fetch("APPLICATION_HOST")}
      action_mailer_asset_host(
        "production",
        %{ENV.fetch("ASSET_HOST", ENV.fetch("APPLICATION_HOST"))},
      )
    end

    def replace_default_puma_configuration
      copy_file "puma.rb", "config/puma.rb", force: true
    end

    def set_up_forego
      copy_file "Procfile", "Procfile"
    end

    def setup_default_directories
      [
        'app/views/pages',
        'spec/lib',
        'spec/controllers',
        'spec/helpers',
        'spec/support/matchers',
        'spec/support/mixins',
        'spec/support/shared_examples'
      ].each do |dir|
        empty_directory_with_keep_file dir
      end
    end

    def copy_dotfiles
      directory("dotfiles", ".")
    end

    def create_heroku_apps(flags)
      create_staging_heroku_app(flags)
      create_production_heroku_app(flags)
    end

    def create_deploy_script
      copy_file "bin_deploy", "bin/deploy"

      instructions = <<-MARKDOWN

## Deploying

If you have previously run the `./bin/setup` script,
you can deploy to staging and production with:

    % ./bin/deploy staging
    % ./bin/deploy production
      MARKDOWN

      append_file "README.md", instructions
      run "chmod a+x bin/deploy"
    end

    def configure_automatic_deployment
      deploy_command = <<-YML.strip_heredoc
      deployment:
        staging:
          branch: master
          commands:
            - bin/deploy staging
      YML

      append_file "circle.yml", deploy_command
    end

    def create_github_repo(repo_name)
      run "hub create #{repo_name}"
    end

    def setup_bundler_audit
      copy_file "bundler_audit.rake", "lib/tasks/bundler_audit.rake"
      append_file "Rakefile", %{\ntask default: "bundle:audit"\n}
    end

    def setup_spring
      bundle_command "exec spring binstub --all"
    end

    def copy_miscellaneous_files
      copy_file "browserslist", "browserslist"
      copy_file "errors.rb", "config/initializers/errors.rb"
      copy_file "json_encoding.rb", "config/initializers/json_encoding.rb"
    end

    def customize_error_pages
      meta_tags =<<-EOS
  <meta charset="utf-8" />
  <meta name="ROBOTS" content="NOODP" />
  <meta name="viewport" content="initial-scale=1" />
      EOS

      %w(500 404 422).each do |page|
        path = "public/#{page}.html"
        if File.exist?(path)
          inject_into_file path, meta_tags, after: "<head>\n"
          replace_in_file path, /<!--.+-->\n/, ''
        end
      end
    end

    def remove_config_comment_lines
      config_files = [
        "application.rb",
        "environment.rb",
        "environments/development.rb",
        "environments/production.rb",
        "environments/test.rb",
      ]

      config_files.each do |config_file|
        path = File.join(destination_root, "config/#{config_file}")

        accepted_content = File.readlines(path).reject do |line|
          line =~ /^.*#.*$/ || line =~ /^$\n/
        end

        File.open(path, "w") do |file|
          accepted_content.each { |line| file.puts line }
        end
      end
    end

    def remove_routes_comment_lines
      replace_in_file 'config/routes.rb',
        /Rails\.application\.routes\.draw do.*end/m,
        "Rails.application.routes.draw do\nend"
    end

    def setup_default_rake_task
      append_file 'Rakefile' do
        <<-EOS
task(:default).clear
task default: [:spec]

if defined? RSpec
  task(:spec).clear
  RSpec::Core::RakeTask.new(:spec) do |t|
    t.verbose = false
  end
end
        EOS
      end
    end

    private

    def raise_on_missing_translations_in(environment)
      config = 'config.action_view.raise_on_missing_translations = true'

      uncomment_lines("config/environments/#{environment}.rb", config)
    end

    def heroku_adapter
      @heroku_adapter ||= Adapters::Heroku.new(self)
    end
  end
end