class Rails::Generators::AppBase

def self.add_shared_options_for(name)
  class_option :template,           type: :string, aliases: '-m',
                                    desc: "Path to some #{name} template (can be a filesystem path or URL)"
  class_option :database,           type: :string, aliases: '-d', default: 'sqlite3',
                                    desc: "Preconfigure for selected database (options: #{DATABASES.join('/')})"
  class_option :javascript,         type: :string, aliases: '-j', default: 'jquery',
                                    desc: 'Preconfigure for selected JavaScript library'
  class_option :skip_gemfile,       type: :boolean, default: false,
                                    desc: "Don't create a Gemfile"
  class_option :skip_bundle,        type: :boolean, aliases: '-B', default: false,
                                    desc: "Don't run bundle install"
  class_option :skip_git,           type: :boolean, aliases: '-G', default: false,
                                    desc: 'Skip .gitignore file'
  class_option :skip_keeps,         type: :boolean, default: false,
                                    desc: 'Skip source control .keep files'
  class_option :skip_action_mailer, type: :boolean, aliases: "-M",
                                    default: false,
                                    desc: "Skip Action Mailer files"
  class_option :skip_active_record, type: :boolean, aliases: '-O', default: false,
                                    desc: 'Skip Active Record files'
  class_option :skip_puma,          type: :boolean, aliases: '-P', default: false,
                                    desc: 'Skip Puma related files'
  class_option :skip_action_cable,  type: :boolean, aliases: '-C', default: false,
                                    desc: 'Skip Action Cable files'
  class_option :skip_sprockets,     type: :boolean, aliases: '-S', default: false,
                                    desc: 'Skip Sprockets files'
  class_option :skip_spring,        type: :boolean, default: false,
                                    desc: "Don't install Spring application preloader"
  class_option :skip_listen,        type: :boolean, default: false,
                                    desc: "Don't generate configuration that depends on the listen gem"
  class_option :skip_javascript,    type: :boolean, aliases: '-J', default: false,
                                    desc: 'Skip JavaScript files'
  class_option :skip_turbolinks,    type: :boolean, default: false,
                                    desc: 'Skip turbolinks gem'
  class_option :skip_test,          type: :boolean, aliases: '-T', default: false,
                                    desc: 'Skip test files'
  class_option :dev,                type: :boolean, default: false,
                                    desc: "Setup the #{name} with Gemfile pointing to your Rails checkout"
  class_option :edge,               type: :boolean, default: false,
                                    desc: "Setup the #{name} with Gemfile pointing to Rails repository"
  class_option :rc,                 type: :string, default: nil,
                                    desc: "Path to file containing extra configuration options for rails command"
  class_option :no_rc,              type: :boolean, default: false,
                                    desc: 'Skip loading of extra configuration options from .railsrc file'
  class_option :help,               type: :boolean, aliases: '-h', group: :rails,
                                    desc: 'Show this help message and quit'
end

def self.strict_args_position
  false
end

def add_gem_entry_filter
  @gem_filter = lambda { |next_filter, entry|
    yield(entry) && next_filter.call(entry)
  }.curry[@gem_filter]
end

def apply_rails_template
  apply rails_template if rails_template
rescue Thor::Error, LoadError, Errno::ENOENT => e
  raise Error, "The template [#{rails_template}] could not be loaded. Error: #{e}"
end

def assets_gemfile_entry
  return [] if options[:skip_sprockets]
  gems = []
  gems << GemfileEntry.version('sass-rails', '~> 5.0',
                               'Use SCSS for stylesheets')
  gems << GemfileEntry.version('uglifier',
                             '>= 1.3.0',
                             'Use Uglifier as compressor for JavaScript assets')
  gems
end

def build(meth, *args)
  builder.send(meth, *args) if builder.respond_to?(meth)
end

def builder
  @builder ||= begin
    builder_class = get_builder_class
    builder_class.include(ActionMethods)
    builder_class.new(self)
  end
end

def bundle_command(command)
  say_status :run, "bundle #{command}"
  # We are going to shell out rather than invoking Bundler::CLI.new(command)
  # because `rails new` loads the Thor gem and on the other hand bundler uses
  # its own vendored Thor, which could be a different version. Running both
  # things in the same process is a recipe for a night with paracetamol.
  #
  # We unset temporary bundler variables to load proper bundler and Gemfile.
  #
  # Thanks to James Tucker for the Gem tricks involved in this call.
  _bundle_command = Gem.bin_path('bundler', 'bundle')
  require 'bundler'
  Bundler.with_clean_env do
    full_command = %Q["#{Gem.ruby}" "#{_bundle_command}" #{command}]
    if options[:quiet]
      system(full_command, out: File::NULL)
    else
      system(full_command)
    end
  end
end

def bundle_install?
  !(options[:skip_gemfile] || options[:skip_bundle] || options[:pretend])
end

def cable_gemfile_entry
  return [] if options[:skip_action_cable]
  comment = 'Use Redis adapter to run Action Cable in production'
  gems = []
  gems << GemfileEntry.new("redis", '~> 3.0', comment, {}, true)
  gems
end

def coffee_gemfile_entry
  GemfileEntry.version 'coffee-rails', '~> 4.2', 'Use CoffeeScript for .coffee assets and views'
end

def comment_if(value)
  options[value] ? '# ' : ''
end

def convert_database_option_for_jruby
  if defined?(JRUBY_VERSION)
    case options[:database]
    when "oracle"     then options[:database].replace "jdbc"
    when "postgresql" then options[:database].replace "jdbcpostgresql"
    when "mysql"      then options[:database].replace "jdbcmysql"
    when "sqlite3"    then options[:database].replace "jdbcsqlite3"
    end
  end
end

def create_root
  valid_const?
  empty_directory '.'
  FileUtils.cd(destination_root) unless options[:pretend]
end

def database_gemfile_entry
  return [] if options[:skip_active_record]
  gem_name, gem_version = gem_for_database
  GemfileEntry.version gem_name, gem_version,
                      "Use #{options[:database]} as the database for Active Record"
end

def depend_on_listen?
  !options[:skip_listen] && os_supports_listen_out_of_the_box?
end

def empty_directory_with_keep_file(destination, config = {})
  empty_directory(destination, config)
  keep_file(destination)
end

def gem_for_database
  # %w( mysql oracle postgresql sqlite3 frontbase ibm_db sqlserver jdbcmysql jdbcsqlite3 jdbcpostgresql )
  case options[:database]
  when "oracle"         then ["ruby-oci8", nil]
  when "postgresql"     then ["pg", ["~> 0.18"]]
  when "frontbase"      then ["ruby-frontbase", nil]
  when "mysql"          then ["mysql2", [">= 0.3.18", "< 0.5"]]
  when "sqlserver"      then ["activerecord-sqlserver-adapter", nil]
  when "jdbcmysql"      then ["activerecord-jdbcmysql-adapter", nil]
  when "jdbcsqlite3"    then ["activerecord-jdbcsqlite3-adapter", nil]
  when "jdbcpostgresql" then ["activerecord-jdbcpostgresql-adapter", nil]
  when "jdbc"           then ["activerecord-jdbc-adapter", nil]
  else [options[:database], nil]
  end
end

def gemfile_entries
  [rails_gemfile_entry,
   database_gemfile_entry,
   webserver_gemfile_entry,
   assets_gemfile_entry,
   javascript_gemfile_entry,
   jbuilder_gemfile_entry,
   psych_gemfile_entry,
   cable_gemfile_entry,
   @extra_entries].flatten.find_all(&@gem_filter)
end

def gemfile_entry(name, *args)
  options = args.extract_options!
  version = args.first
  github = options[:github]
  path   = options[:path]
  if github
    @extra_entries << GemfileEntry.github(name, github)
  elsif path
    @extra_entries << GemfileEntry.path(name, path)
  else
    @extra_entries << GemfileEntry.version(name, version)
  end
  self
end

def generate_spring_binstubs
  if bundle_install? && spring_install?
    bundle_command("exec spring binstub --all")
  end
end

def include_all_railties?
  options.values_at(:skip_active_record, :skip_action_mailer, :skip_test, :skip_sprockets, :skip_action_cable).none?
end

def initialize(*args)
  @gem_filter    = lambda { |gem| true }
  @extra_entries = []
  super
  convert_database_option_for_jruby
end

def javascript_gemfile_entry
  if options[:skip_javascript] || options[:skip_sprockets]
    []
  else
    gems = [coffee_gemfile_entry, javascript_runtime_gemfile_entry]
    gems << GemfileEntry.version("#{options[:javascript]}-rails", nil,
                                 "Use #{options[:javascript]} as the JavaScript library")
    unless options[:skip_turbolinks]
      gems << GemfileEntry.version("turbolinks", "~> 5",
       "Turbolinks makes navigating your web application faster. Read more: https://github.com/turbolinks/turbolinks")
    end
    gems
  end
end

def javascript_runtime_gemfile_entry
  comment = 'See https://github.com/rails/execjs#readme for more supported runtimes'
  if defined?(JRUBY_VERSION)
    GemfileEntry.version 'therubyrhino', nil, comment
  else
    GemfileEntry.new 'therubyracer', nil, comment, { platforms: :ruby }, true
  end
end

def jbuilder_gemfile_entry
  comment = 'Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder'
  GemfileEntry.new 'jbuilder', '~> 2.5', comment, {}, options[:api]
end

def keep_file(destination)
  create_file("#{destination}/.keep") if keeps?
end

def keeps?
  !options[:skip_keeps]
end

def os_supports_listen_out_of_the_box?
  RbConfig::CONFIG['host_os'] =~ /darwin|linux/
end

def psych_gemfile_entry
  return [] unless defined?(Rubinius)
  comment = 'Use Psych as the YAML engine, instead of Syck, so serialized ' \
            'data can be read safely from different rubies (see http://git.io/uuLVag)'
  GemfileEntry.new('psych', '~> 2.0', comment, platforms: :rbx)
end

def rails_gemfile_entry
  dev_edge_common = [
  ]
  if options.dev?
    [
      GemfileEntry.path('rails', Rails::Generators::RAILS_DEV_PATH)
    ] + dev_edge_common
  elsif options.edge?
    [
      GemfileEntry.github('rails', 'rails/rails', '5-0-stable')
    ] + dev_edge_common
  else
    [GemfileEntry.version('rails',
                      rails_version_specifier,
                      "Bundle edge Rails instead: gem 'rails', github: 'rails/rails'")]
  end
end

def rails_version_specifier(gem_version = Rails.gem_version)
  if gem_version.prerelease?
    next_series = gem_version
    next_series = next_series.bump while next_series.segments.size > 2
    [">= #{gem_version}", "< #{next_series}"]
  elsif gem_version.segments.size == 3
    "~> #{gem_version}"
  else
    patch = gem_version.segments[0, 3].join(".")
    ["~> #{patch}", ">= #{gem_version}"]
  end
end

def run_bundle
  bundle_command('install') if bundle_install?
end

def set_default_accessors!
  self.destination_root = File.expand_path(app_path, destination_root)
  self.rails_template = case options[:template]
    when /^https?:\/\//
      options[:template]
    when String
      File.expand_path(options[:template], Dir.pwd)
    else
      options[:template]
  end
end

def spring_install?
  !options[:skip_spring] && !options.dev? && Process.respond_to?(:fork) && !RUBY_PLATFORM.include?("cygwin")
end

def sqlite3?
  !options[:skip_active_record] && options[:database] == 'sqlite3'
end

def webserver_gemfile_entry
  return [] if options[:skip_puma]
  comment = 'Use Puma as the app server'
  GemfileEntry.new('puma', '~> 3.0', comment)
end