class Pleiades::SetupGenerator < Rails::Generators::Base
  source_root File.expand_path('templates', __dir__)

  exe_user_options =
    {
      aliases: '-u',
      type: :boolean,
      desc: 'Execute generate migration:user & user_related_commands'
    }
  class_option :user_related_files, exe_user_options

  def gen_user_related_files
    return unless options['user_related_files']

    gen_user_table unless user_table_exist?
    gen_users_command unless users_command_exist?
  end

  def gen_base_command
    return if base_command_exist?

    copy_file File.basename(command_file_path), command_file_path
  end

  def gen_command_concern
    return if command_concern_exist?

    template File.basename(command_concern_path('e')), command_concern_path
  end

  def gen_controller
    return if controller_file_exist?

    generate 'controller', controller_dir

    route routes_drowing_str

    File.delete controller_file_path
    copy_file File.basename(controller_file_path), controller_file_path
  end

  private

  def method_missing(method, *_)
    method_name = /^(([a-z]+_)+)exist\?$/.match(method.to_s)
    return super unless method_name

    File.exist? method(:"#{method_name[1]}path").call
  end

  # UserModelのマイグレーションファイル生成
  def gen_user_table
    generate 'model', "user #{migration_arguments}"

    user_schemas.each_pair do |key, val|
      next unless val[:options]

      inject_into_file(
        migration_file_path,
        ", #{val[:options]}",
        after: key
      )
    end
  end

  # ユーザに関するコマンドの生成
  def gen_users_command
    dir = 'users'
    command_events = %w[follow unfollow]

    command_events.each { |event| generate 'pleiades:command', "#{event} -d #{dir} -t #{event}" }
  end

  def migration_arguments
    user_schemas
      .each_pair
      .inject('') { |str, (key, val)| "#{str}#{key}:#{val[:type]} " }
  end

  def user_schemas
    {
      line_id:          { type: :string, options: 'null: false, unique: true' },
      unsubscrided:     { type: :boolean },
      unsubscrided_at:  { type: :datetime }
    }
  end

  def user_table_path
    path = Dir.glob(migration_file_path).first
    path || migration_file_path
  end

  def migration_file_path
    'db/migrate/*_users.rb'
  end

  def users_command_path
    "#{Pleiades::Config.command.commands_path}/users/follow.rb"
  end

  def base_command_path
    "#{Pleiades::Config.command.commands_path}/base_command.rb"
  end

  def command_concern_path(add_ext = false)
    ext = add_ext ? true.to_s[3] : ''
    "#{Pleiades::Config.command.commands_path}/concerns/command_common.#{ext}rb"
  end

  def controller_file_path
    "app/controllers/#{controller_dir}_controller.rb"
  end

  def controller_dir
    'line/api'
  end

  def routes_drowing_str
    <<~ROUTE
      namespace :line do
        namespace :api do
          post '/' , action: 'callback'
        end
      end
    ROUTE
  end
end