# frozen_string_literal: true

module Gitlab
  module Kubernetes
    class NetworkPolicy
      def initialize(name:, namespace:, pod_selector:, ingress:, creation_timestamp: nil, policy_types: ["Ingress"], egress: nil)
        @name = name
        @namespace = namespace
        @creation_timestamp = creation_timestamp
        @pod_selector = pod_selector
        @policy_types = policy_types
        @ingress = ingress
        @egress = egress
      end

      def self.from_yaml(manifest)
        return unless manifest

        policy = YAML.safe_load(manifest, symbolize_names: true)
        return if !policy[:metadata] || !policy[:spec]

        metadata = policy[:metadata]
        spec = policy[:spec]
        self.new(
          name: metadata[:name],
          namespace: metadata[:namespace],
          pod_selector: spec[:podSelector],
          policy_types: spec[:policyTypes],
          ingress: spec[:ingress],
          egress: spec[:egress]
        )
      rescue Psych::SyntaxError, Psych::DisallowedClass
        nil
      end

      def self.from_resource(resource)
        return unless resource
        return if !resource[:metadata] || !resource[:spec]

        metadata = resource[:metadata]
        spec = resource[:spec].to_h
        self.new(
          name: metadata[:name],
          namespace: metadata[:namespace],
          creation_timestamp: metadata[:creationTimestamp],
          pod_selector: spec[:podSelector],
          policy_types: spec[:policyTypes],
          ingress: spec[:ingress],
          egress: spec[:egress]
        )
      end

      def generate
        ::Kubeclient::Resource.new.tap do |resource|
          resource.metadata = metadata
          resource.spec = spec
        end
      end

      def as_json(opts = nil)
        {
          name: name,
          namespace: namespace,
          creation_timestamp: creation_timestamp,
          manifest: manifest
        }
      end

      private

      attr_reader :name, :namespace, :creation_timestamp, :pod_selector, :policy_types, :ingress, :egress

      def metadata
        { name: name, namespace: namespace }
      end

      def spec
        {
          podSelector: pod_selector,
          policyTypes: policy_types,
          ingress: ingress,
          egress: egress
        }
      end

      def manifest
        YAML.dump({ metadata: metadata, spec: spec }.deep_stringify_keys)
      end
    end
  end
end