class Jekyll::Commands::New

def after_install(path, options = {})
  unless options["blank"] || options["skip-bundle"]
    begin
      require "bundler"
      bundle_install path
    rescue LoadError
      Jekyll.logger.info "Could not load Bundler. Bundle install skipped."
    end
  end
  Jekyll.logger.info "New jekyll site installed in #{path.cyan}."
  Jekyll.logger.info "Bundle install skipped." if options["skip-bundle"]
end

def blank_template
  File.expand_path("../../blank_template", __dir__)
end

def bundle_install(path)
  Jekyll.logger.info "Running bundle install in #{path.cyan}..."
  Dir.chdir(path) do
    exe = Gem.bin_path("bundler", "bundle")
    process, output = Jekyll::Utils::Exec.run("ruby", exe, "install")
    output.to_s.each_line do |line|
      Jekyll.logger.info("Bundler:".green, line.strip) unless line.to_s.empty?
    end
    raise SystemExit unless process.success?
  end
end

def create_blank_site(path)
  FileUtils.cp_r blank_template + "/.", path
  FileUtils.chmod_R "u+w", path
  Dir.chdir(path) do
    FileUtils.mkdir(%w(_data _drafts _includes _posts))
  end
end

def create_sample_files(path)
  FileUtils.cp_r site_template + "/.", path
  FileUtils.chmod_R "u+w", path
  FileUtils.rm File.expand_path(scaffold_path, path)
end

def create_site(new_blog_path)
  create_sample_files new_blog_path
  File.write(File.expand_path(initialized_post_name, new_blog_path), scaffold_post_content)
  File.write(File.expand_path("Gemfile", new_blog_path), gemfile_contents)
end

def gemfile_contents
  <<~RUBY
    source "https://rubygems.org"
    # Hello! This is where you manage which Jekyll version is used to run.
    # When you want to use a different version, change it below, save the
    # file and run `bundle install`. Run Jekyll with `bundle exec`, like so:
    #
    #     bundle exec jekyll serve
    #
    # This will help ensure the proper Jekyll version is running.
    # Happy Jekylling!
    gem "jekyll", "~> #{Jekyll::VERSION}"
    # This is the default theme for new Jekyll sites. You may change this to anything you like.
    gem "minima", "~> 2.5"
    # If you want to use GitHub Pages, remove the "gem "jekyll"" above and
    # uncomment the line below. To upgrade, run `bundle update github-pages`.
    # gem "github-pages", group: :jekyll_plugins
    # If you have any plugins, put them here!
    group :jekyll_plugins do
      gem "jekyll-feed", "~> 0.12"
    end
    # Windows and JRuby does not include zoneinfo files, so bundle the tzinfo-data gem
    # and associated library.
    platforms :mingw, :x64_mingw, :mswin, :jruby do
      gem "tzinfo", ">= 1", "< 3"
      gem "tzinfo-data"
    end
    # Performance-booster for watching directories on Windows
    gem "wdm", "~> 0.1", :platforms => [:mingw, :x64_mingw, :mswin]
    # Lock `http_parser.rb` gem to `v0.6.x` on JRuby builds since newer versions of the gem
    # do not have a Java counterpart.
    gem "http_parser.rb", "~> 0.6.0", :platforms => [:jruby]
  RUBY
end

def init_with_program(prog)
  prog.command(:new) do |c|
    c.syntax "new PATH"
    c.description "Creates a new Jekyll site scaffold in PATH"
    c.option "force", "--force", "Force creation even if PATH already exists"
    c.option "blank", "--blank", "Creates scaffolding but with empty files"
    c.option "skip-bundle", "--skip-bundle", "Skip 'bundle install'"
    c.action do |args, options|
      Jekyll::Commands::New.process(args, options)
    end
  end
end

def initialized_post_name
  "_posts/#{Time.now.strftime("%Y-%m-%d")}-welcome-to-jekyll.markdown"
end

def preserve_source_location?(path, options)
  !options["force"] && !Dir["#{path}/**/*"].empty?
end

def process(args, options = {})
  raise ArgumentError, "You must specify a path." if args.empty?
  new_blog_path = File.expand_path(args.join(" "), Dir.pwd)
  FileUtils.mkdir_p new_blog_path
  if preserve_source_location?(new_blog_path, options)
    Jekyll.logger.error "Conflict:", "#{new_blog_path} exists and is not empty."
    Jekyll.logger.abort_with "", "Ensure #{new_blog_path} is empty or else try again " \
                                 "with `--force` to proceed and overwrite any files."
  end
  if options["blank"]
    create_blank_site new_blog_path
  else
    create_site new_blog_path
  end
  after_install(new_blog_path, options)
end

def scaffold_path
  "_posts/0000-00-00-welcome-to-jekyll.markdown.erb"
end

def scaffold_post_content
  ERB.new(File.read(File.expand_path(scaffold_path, site_template))).result
end

def site_template
  File.expand_path("../../site_template", __dir__)
end