# frozen_string_literal: true

module API
  class ProjectClusters < ::API::Base
    include PaginationParams

    before do
      authenticate!
      ensure_feature_enabled!
    end

    feature_category :kubernetes_management
    urgency :low

    params do
      requires :id, types: [String, Integer], desc: 'The ID or URL-encoded path of the project'
    end
    resource :projects, requirements: API::NAMESPACE_OR_PROJECT_REQUIREMENTS do
      desc 'Get all clusters from the project' do
        detail 'This feature was introduced in GitLab 11.7.'
        success Entities::Cluster
      end
      params do
        use :pagination
      end
      get ':id/clusters' do
        authorize! :read_cluster, user_project

        present paginate(clusters_for_current_user), with: Entities::Cluster
      end

      desc 'Get specific cluster for the project' do
        detail 'This feature was introduced in GitLab 11.7.'
        success Entities::ClusterProject
      end
      params do
        requires :cluster_id, type: Integer, desc: 'The cluster ID'
      end
      get ':id/clusters/:cluster_id' do
        authorize! :read_cluster, cluster

        present cluster, with: Entities::ClusterProject
      end

      desc 'Adds an existing cluster' do
        detail 'This feature was introduced in GitLab 11.7.'
        success Entities::ClusterProject
      end
      params do
        requires :name, type: String, desc: 'Cluster name'
        optional :enabled, type: Boolean, default: true, desc: 'Determines if cluster is active or not, defaults to true'
        optional :domain, type: String, desc: 'Cluster base domain'
        optional :environment_scope, default: '*', type: String, desc: 'The associated environment to the cluster'
        optional :namespace_per_environment, default: true, type: Boolean, desc: 'Deploy each environment to a separate Kubernetes namespace'
        optional :management_project_id, type: Integer, desc: 'The ID of the management project'
        optional :managed, type: Boolean, default: true, desc: 'Determines if GitLab will manage namespaces and service accounts for this cluster, defaults to true'
        requires :platform_kubernetes_attributes, type: Hash, desc: %q(Platform Kubernetes data) do
          requires :api_url, type: String, allow_blank: false, desc: 'URL to access the Kubernetes API'
          requires :token, type: String, desc: 'Token to authenticate against Kubernetes'
          optional :ca_cert, type: String, desc: 'TLS certificate (needed if API is using a self-signed TLS certificate)'
          optional :namespace, type: String, desc: 'Unique namespace related to Project'
          optional :authorization_type, type: String, values: ::Clusters::Platforms::Kubernetes.authorization_types.keys, default: 'rbac', desc: 'Cluster authorization type, defaults to RBAC'
        end
      end
      post ':id/clusters/user' do
        authorize! :add_cluster, user_project

        user_cluster = ::Clusters::CreateService
          .new(current_user, create_cluster_user_params)
          .execute

        if user_cluster.persisted?
          present user_cluster, with: Entities::ClusterProject
        else
          render_validation_error!(user_cluster)
        end
      end

      desc 'Update an existing cluster' do
        detail 'This feature was introduced in GitLab 11.7.'
        success Entities::ClusterProject
      end
      params do
        requires :cluster_id, type: Integer, desc: 'The cluster ID'
        optional :name, type: String, desc: 'Cluster name'
        optional :domain, type: String, desc: 'Cluster base domain'
        optional :environment_scope, type: String, desc: 'The associated environment to the cluster'
        optional :namespace_per_environment, default: true, type: Boolean, desc: 'Deploy each environment to a separate Kubernetes namespace'
        optional :management_project_id, type: Integer, desc: 'The ID of the management project'
        optional :enabled, type: Boolean, desc: 'Determines if cluster is active or not'
        optional :managed, type: Boolean, desc: 'Determines if GitLab will manage namespaces and service accounts for this cluster'
        optional :platform_kubernetes_attributes, type: Hash, desc: %q(Platform Kubernetes data) do
          optional :api_url, type: String, desc: 'URL to access the Kubernetes API'
          optional :token, type: String, desc: 'Token to authenticate against Kubernetes'
          optional :ca_cert, type: String, desc: 'TLS certificate (needed if API is using a self-signed TLS certificate)'
          optional :namespace, type: String, desc: 'Unique namespace related to Project'
        end
      end
      put ':id/clusters/:cluster_id' do
        authorize! :update_cluster, cluster

        update_service = ::Clusters::UpdateService.new(current_user, update_cluster_params)

        if update_service.execute(cluster)
          present cluster, with: Entities::ClusterProject
        else
          render_validation_error!(cluster)
        end
      end

      desc 'Remove a cluster' do
        detail 'This feature was introduced in GitLab 11.7.'
        success Entities::ClusterProject
      end
      params do
        requires :cluster_id, type: Integer, desc: 'The Cluster ID'
      end
      delete ':id/clusters/:cluster_id' do
        authorize! :admin_cluster, cluster

        destroy_conditionally!(cluster)
      end
    end

    helpers do
      def clusters_for_current_user
        @clusters_for_current_user ||= ClustersFinder.new(user_project, current_user, :all).execute
      end

      def cluster
        @cluster ||= clusters_for_current_user.find(params[:cluster_id])
      end

      def create_cluster_user_params
        declared_params.merge({
          provider_type: :user,
          platform_type: :kubernetes,
          clusterable: user_project
        })
      end

      def update_cluster_params
        declared_params(include_missing: false).without(:cluster_id)
      end

      def ensure_feature_enabled!
        namespace = user_project.namespace

        not_found! unless namespace.certificate_based_clusters_enabled?
      end
    end
  end
end