#!/usr/bin/env ruby

require 'erb'
require 'ostruct'

require 'active_support/version'
if ActiveSupport::VERSION::STRING >= '7.1'
  require 'active_support/deprecation'
  require 'active_support/deprecator'
end
require 'active_support/core_ext/string'

require 'saddle'


# Creation options
# TODO: read via CLI
settings = {
  service_name: 'Example',
  author_name: 'Mike Lewis',
  author_email: 'mike.lewis@airbnb.com',
  github_account: 'airbnb',
}


# This holds the project settings and realizes templates
class ProjectGenerator
  attr_reader :settings

  # Expected settings:
  #   service_name
  #   author_name
  #   author_email
  #   github_account
  def initialize(settings)
    settings[:project_name] = "#{settings[:service_name].underscore}-client"
    settings[:root_module] = settings[:service_name].split('_').map(&:capitalize).join('')
    settings[:saddle_version] = Saddle::VERSION
    @settings = OpenStruct.new(settings)

    @template_dir = File.join(File.dirname(__FILE__), 'template')
    @output_dir = '.'
  end

  # Transform a template file into the output directory
  def transform_template(in_file, out_file=nil)
    out_file = in_file if out_file.nil?
    puts "Processing: #{out_file}"

    # Ensure the directory is there
    FileUtils.mkdir_p(File.dirname(out_file))
    # Write the processed template
    #puts File.read(File.join(@template_dir, in_file), 'r')
    File.open(File.join(@output_dir, out_file), 'w') do |output|
      output.puts(
        ERB.new(
          File.read(File.join(@template_dir, in_file))
        ).result(
          @settings.instance_eval { binding }
        )
      )
    end
  end
end

pg = ProjectGenerator.new(settings)
# /lib
# Create the contents of the gem directory in the correctly named directory
%w(
  endpoints/status.rb
  middleware/exception_raiser.rb
  exceptions.rb
  stub.rb
  version.rb
).each do |tmpl|
  pg.transform_template("lib/saddle-client/#{tmpl}", "lib/#{pg.settings.project_name}/#{tmpl}")
end
pg.transform_template('lib/saddle-client.rb', "lib/#{pg.settings.project_name}.rb")
# /spec
pg.transform_template('spec/integration/status_spec.rb')
pg.transform_template('spec/middleware/exception_raiser_spec.rb')
pg.transform_template('spec/stub/stub_spec.rb')
pg.transform_template('spec/spec_helper.rb')
# /
pg.transform_template('.gitignore')
pg.transform_template('.rspec')
pg.transform_template('Gemfile')
pg.transform_template('LICENSE')
pg.transform_template('README.md')
pg.transform_template('saddle-client.gemspec', "#{pg.settings.project_name}.gemspec")