module API
  module V3
    class Environments < Grape::API
      include ::API::Helpers::CustomValidators
      include PaginationParams

      before { authenticate! }

      params do
        requires :id, type: String, desc: 'The project ID'
      end
      resource :projects, requirements: { id: %r{[^/]+} } do
        desc 'Get all environments of the project' do
          detail 'This feature was introduced in GitLab 8.11.'
          success Entities::Environment
        end
        params do
          use :pagination
        end
        get ':id/environments' do
          authorize! :read_environment, user_project

          present paginate(user_project.environments), with: Entities::Environment
        end

        desc 'Creates a new environment' do
          detail 'This feature was introduced in GitLab 8.11.'
          success Entities::Environment
        end
        params do
          requires :name,           type: String,   desc: 'The name of the environment to be created'
          optional :external_url,   type: String,   desc: 'URL on which this deployment is viewable'
          optional :slug, absence: { message: "is automatically generated and cannot be changed" }
        end
        post ':id/environments' do
          authorize! :create_environment, user_project

          environment = user_project.environments.create(declared_params)

          if environment.persisted?
            present environment, with: Entities::Environment
          else
            render_validation_error!(environment)
          end
        end

        desc 'Updates an existing environment' do
          detail 'This feature was introduced in GitLab 8.11.'
          success Entities::Environment
        end
        params do
          requires :environment_id, type: Integer,  desc: 'The environment ID'
          optional :name,           type: String,   desc: 'The new environment name'
          optional :external_url,   type: String,   desc: 'The new URL on which this deployment is viewable'
          optional :slug, absence: { message: "is automatically generated and cannot be changed" }
        end
        put ':id/environments/:environment_id' do
          authorize! :update_environment, user_project

          environment = user_project.environments.find(params[:environment_id])

          update_params = declared_params(include_missing: false).extract!(:name, :external_url)
          if environment.update(update_params)
            present environment, with: Entities::Environment
          else
            render_validation_error!(environment)
          end
        end

        desc 'Deletes an existing environment' do
          detail 'This feature was introduced in GitLab 8.11.'
          success Entities::Environment
        end
        params do
          requires :environment_id, type: Integer,  desc: 'The environment ID'
        end
        delete ':id/environments/:environment_id' do
          authorize! :update_environment, user_project

          environment = user_project.environments.find(params[:environment_id])

          present environment.destroy, with: Entities::Environment
        end
      end
    end
  end
end
