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path: root/lib/api/milestones.rb
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module API
  # Milestones API
  class Milestones < Grape::API
    before { authenticate! }

    helpers do
      def filter_milestones_state(milestones, state)
        case state
        when 'active' then milestones.active
        when 'closed' then milestones.closed
        else milestones
        end
      end

      params :optional_params do
        optional :description, type: String, desc: 'The description of the milestone'
        optional :due_date, type: String, desc: 'The due date of the milestone. The ISO 8601 date format (%Y-%m-%d)'
        optional :start_date, type: String, desc: 'The start date of the milestone. The ISO 8601 date format (%Y-%m-%d)'
      end
    end

    params do
      requires :id, type: String, desc: 'The ID of a project'
    end
    resource :projects do
      desc 'Get a list of project milestones' do
        success Entities::Milestone
      end
      params do
        optional :state, type: String, values: %w[active closed all], default: 'all',
                         desc: 'Return "active", "closed", or "all" milestones'
        optional :iid, type: Array[Integer], desc: 'The IID of the milestone'
      end
      get ":id/milestones" do
        authorize! :read_milestone, user_project

        milestones = user_project.milestones
        milestones = filter_milestones_state(milestones, params[:state])
        milestones = filter_by_iid(milestones, params[:iid]) if params[:iid].present?

        present paginate(milestones), with: Entities::Milestone
      end

      desc 'Get a single project milestone' do
        success Entities::Milestone
      end
      params do
        requires :milestone_id, type: Integer, desc: 'The ID of a project milestone'
      end
      get ":id/milestones/:milestone_id" do
        authorize! :read_milestone, user_project

        milestone = user_project.milestones.find(params[:milestone_id])
        present milestone, with: Entities::Milestone
      end

      desc 'Create a new project milestone' do
        success Entities::Milestone
      end
      params do
        requires :title, type: String, desc: 'The title of the milestone'
        use :optional_params
      end
      post ":id/milestones" do
        authorize! :admin_milestone, user_project

        milestone = ::Milestones::CreateService.new(user_project, current_user, declared_params).execute

        if milestone.valid?
          present milestone, with: Entities::Milestone
        else
          render_api_error!("Failed to create milestone #{milestone.errors.messages}", 400)
        end
      end

      desc 'Update an existing project milestone' do
        success Entities::Milestone
      end
      params do
        requires :milestone_id, type: Integer, desc: 'The ID of a project milestone'
        optional :title, type: String, desc: 'The title of the milestone'
        optional :state_event, type: String, values: %w[close activate],
                               desc: 'The state event of the milestone '
        use :optional_params
        at_least_one_of :title, :description, :due_date, :state_event
      end
      put ":id/milestones/:milestone_id" do
        authorize! :admin_milestone, user_project
        milestone = user_project.milestones.find(params.delete(:milestone_id))

        milestone_params = declared_params(include_missing: false)
        milestone = ::Milestones::UpdateService.new(user_project, current_user, milestone_params).execute(milestone)

        if milestone.valid?
          present milestone, with: Entities::Milestone
        else
          render_api_error!("Failed to update milestone #{milestone.errors.messages}", 400)
        end
      end

      desc 'Get all issues for a single project milestone' do
        success Entities::Issue
      end
      params do
        requires :milestone_id, type: Integer, desc: 'The ID of a project milestone'
      end
      get ":id/milestones/:milestone_id/issues" do
        authorize! :read_milestone, user_project

        milestone = user_project.milestones.find(params[:milestone_id])

        finder_params = {
          project_id: user_project.id,
          milestone_title: milestone.title
        }

        issues = IssuesFinder.new(current_user, finder_params).execute
        present paginate(issues), with: Entities::Issue, current_user: current_user, project: user_project
      end
    end
  end
end