module API
  class Templates < Grape::API
    GLOBAL_TEMPLATE_TYPES = {
      gitignores: {
        klass: Gitlab::Template::GitignoreTemplate,
        gitlab_version: 8.8
      },
      gitlab_ci_ymls: {
        klass: Gitlab::Template::GitlabCiYmlTemplate,
        gitlab_version: 8.9
      },
      dockerfiles: {
        klass: Gitlab::Template::DockerfileTemplate,
        gitlab_version: 8.15
      }
    }.freeze
    PROJECT_TEMPLATE_REGEX =
      /[\<\{\[]
        (project|description|
        one\sline\s.+\swhat\sit\sdoes\.) # matching the start and end is enough here
      [\>\}\]]/xi.freeze
    YEAR_TEMPLATE_REGEX = /[<{\[](year|yyyy)[>}\]]/i.freeze
    FULLNAME_TEMPLATE_REGEX =
      /[\<\{\[]
        (fullname|name\sof\s(author|copyright\sowner))
      [\>\}\]]/xi.freeze
    DEPRECATION_MESSAGE = ' This endpoint is deprecated and will be removed in GitLab 9.0.'.freeze

    helpers do
      def parsed_license_template
        # We create a fresh Licensee::License object since we'll modify its
        # content in place below.
        template = Licensee::License.new(params[:name])

        template.content.gsub!(YEAR_TEMPLATE_REGEX, Time.now.year.to_s)
        template.content.gsub!(PROJECT_TEMPLATE_REGEX, params[:project]) if params[:project].present?

        fullname = params[:fullname].presence || current_user.try(:name)
        template.content.gsub!(FULLNAME_TEMPLATE_REGEX, fullname) if fullname
        template
      end

      def render_response(template_type, template)
        not_found!(template_type.to_s.singularize) unless template
        present template, with: Entities::Template
      end
    end

    { "licenses" => :deprecated, "templates/licenses" => :ok }.each do |route, status|
      desc 'Get the list of the available license template' do
        detailed_desc = 'This feature was introduced in GitLab 8.7.'
        detailed_desc << DEPRECATION_MESSAGE unless status == :ok
        detail detailed_desc
        success Entities::RepoLicense
      end
      params do
        optional :popular, type: Boolean, desc: 'If passed, returns only popular licenses'
      end
      get route do
        options = {
          featured: declared(params).popular.present? ? true : nil
        }
        present Licensee::License.all(options), with: Entities::RepoLicense
      end
    end

    { "licenses/:name" => :deprecated, "templates/licenses/:name" => :ok }.each do |route, status|
      desc 'Get the text for a specific license' do
        detailed_desc = 'This feature was introduced in GitLab 8.7.'
        detailed_desc << DEPRECATION_MESSAGE unless status == :ok
        detail detailed_desc
        success Entities::RepoLicense
      end
      params do
        requires :name, type: String, desc: 'The name of the template'
      end
      get route, requirements: { name: /[\w\.-]+/ } do
        not_found!('License') unless Licensee::License.find(declared(params).name)

        template = parsed_license_template

        present template, with: Entities::RepoLicense
      end
    end

    GLOBAL_TEMPLATE_TYPES.each do |template_type, properties|
      klass = properties[:klass]
      gitlab_version = properties[:gitlab_version]

      { template_type => :deprecated, "templates/#{template_type}" => :ok }.each do |route, status|
        desc 'Get the list of the available template' do
          detailed_desc = "This feature was introduced in GitLab #{gitlab_version}."
          detailed_desc << DEPRECATION_MESSAGE unless status == :ok
          detail detailed_desc
          success Entities::TemplatesList
        end
        get route do
          present klass.all, with: Entities::TemplatesList
        end
      end

      { "#{template_type}/:name" => :deprecated, "templates/#{template_type}/:name" => :ok }.each do |route, status|
        desc 'Get the text for a specific template present in local filesystem' do
          detailed_desc = "This feature was introduced in GitLab #{gitlab_version}."
          detailed_desc << DEPRECATION_MESSAGE unless status == :ok
          detail detailed_desc
          success Entities::Template
        end
        params do
          requires :name, type: String, desc: 'The name of the template'
        end
        get route do
          new_template = klass.find(declared(params).name)

          render_response(template_type, new_template)
        end
      end
    end
  end
end