package k8sapi

import (
	"github.com/edgelesssys/constellation/coordinator/kubernetes/k8sapi/resources"
	v1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	kubeletconf "k8s.io/kubelet/config/v1beta1"
	kubeadm "k8s.io/kubernetes/cmd/kubeadm/app/apis/kubeadm/v1beta3"
)

// Uses types defined here: https://kubernetes.io/docs/reference/config-api/kubeadm-config.v1beta3/
// Slimmed down to the fields we require

const (
	bindPort = 6443
)

type CoreOSConfiguration struct{}

func (c *CoreOSConfiguration) InitConfiguration() KubeadmInitYAML {
	return KubeadmInitYAML{
		InitConfiguration: kubeadm.InitConfiguration{
			TypeMeta: v1.TypeMeta{
				APIVersion: kubeadm.SchemeGroupVersion.String(),
				Kind:       "InitConfiguration",
			},
			NodeRegistration: kubeadm.NodeRegistrationOptions{
				CRISocket: "/run/containerd/containerd.sock",
				KubeletExtraArgs: map[string]string{
					"cloud-provider": "external",
					"network-plugin": "cni",
				},
			},
			// AdvertiseAddress will be overwritten later
			LocalAPIEndpoint: kubeadm.APIEndpoint{
				BindPort: bindPort,
			},
		},
		ClusterConfiguration: kubeadm.ClusterConfiguration{
			TypeMeta: v1.TypeMeta{
				Kind:       "ClusterConfiguration",
				APIVersion: kubeadm.SchemeGroupVersion.String(),
			},
			// necessary to be able to access the kubeapi server through localhost
			APIServer: kubeadm.APIServer{
				CertSANs: []string{"127.0.0.1", "10.118.0.1"},
			},
			ControllerManager: kubeadm.ControlPlaneComponent{
				ExtraArgs: map[string]string{
					"flex-volume-plugin-dir": "/opt/libexec/kubernetes/kubelet-plugins/volume/exec/",
					"cloud-provider":         "external",
					"configure-cloud-routes": "false",
				},
			},
			ControlPlaneEndpoint: "127.0.0.1:16443",
		},
		// warning: this config is applied to every node in the cluster!
		KubeletConfiguration: kubeletconf.KubeletConfiguration{
			TypeMeta: v1.TypeMeta{
				APIVersion: kubeletconf.SchemeGroupVersion.String(),
				Kind:       "KubeletConfiguration",
			},
		},
	}
}

func (c *CoreOSConfiguration) JoinConfiguration() KubeadmJoinYAML {
	return KubeadmJoinYAML{
		JoinConfiguration: kubeadm.JoinConfiguration{
			TypeMeta: v1.TypeMeta{
				APIVersion: kubeadm.SchemeGroupVersion.String(),
				Kind:       "JoinConfiguration",
			},
			NodeRegistration: kubeadm.NodeRegistrationOptions{
				CRISocket: "/run/containerd/containerd.sock",
				KubeletExtraArgs: map[string]string{
					"cloud-provider": "external",
				},
			},
			Discovery: kubeadm.Discovery{
				BootstrapToken: &kubeadm.BootstrapTokenDiscovery{},
			},
		},
		KubeletConfiguration: kubeletconf.KubeletConfiguration{
			TypeMeta: v1.TypeMeta{
				APIVersion: kubeletconf.SchemeGroupVersion.String(),
				Kind:       "KubeletConfiguration",
			},
		},
	}
}

type AWSConfiguration struct{}

func (a *AWSConfiguration) InitConfiguration() KubeadmInitYAML {
	return KubeadmInitYAML{
		InitConfiguration: kubeadm.InitConfiguration{
			TypeMeta: v1.TypeMeta{
				APIVersion: kubeadm.SchemeGroupVersion.String(),
				Kind:       "InitConfiguration",
			},
			NodeRegistration: kubeadm.NodeRegistrationOptions{
				CRISocket:             "/run/containerd/containerd.sock",
				IgnorePreflightErrors: []string{"SystemVerification"},
			},
			LocalAPIEndpoint: kubeadm.APIEndpoint{BindPort: bindPort},
		},
		ClusterConfiguration: kubeadm.ClusterConfiguration{
			TypeMeta: v1.TypeMeta{
				APIVersion: kubeadm.SchemeGroupVersion.String(),
				Kind:       "ClusterConfiguration",
			},
			APIServer: kubeadm.APIServer{
				CertSANs: []string{"10.118.0.1"},
			},
		},
		KubeletConfiguration: kubeletconf.KubeletConfiguration{
			TypeMeta: v1.TypeMeta{
				APIVersion: kubeletconf.SchemeGroupVersion.String(),
				Kind:       "KubeletConfiguration",
			},
		},
	}
}

func (a *AWSConfiguration) JoinConfiguration() KubeadmJoinYAML {
	return KubeadmJoinYAML{
		JoinConfiguration: kubeadm.JoinConfiguration{
			TypeMeta: v1.TypeMeta{
				APIVersion: kubeadm.SchemeGroupVersion.String(),
				Kind:       "JoinConfiguration",
			},
			NodeRegistration: kubeadm.NodeRegistrationOptions{
				CRISocket:             "/run/containerd/containerd.sock",
				IgnorePreflightErrors: []string{"SystemVerification"},
			},
			Discovery: kubeadm.Discovery{
				BootstrapToken: &kubeadm.BootstrapTokenDiscovery{},
			},
		},
		KubeletConfiguration: kubeletconf.KubeletConfiguration{
			TypeMeta: v1.TypeMeta{
				APIVersion: kubeletconf.SchemeGroupVersion.String(),
				Kind:       "KubeletConfiguration",
			},
		},
	}
}

type KubeadmJoinYAML struct {
	JoinConfiguration    kubeadm.JoinConfiguration
	KubeletConfiguration kubeletconf.KubeletConfiguration
}

func (k *KubeadmJoinYAML) SetNodeName(nodeName string) {
	k.JoinConfiguration.NodeRegistration.Name = nodeName
}

func (k *KubeadmJoinYAML) SetApiServerEndpoint(apiServerEndpoint string) {
	k.JoinConfiguration.Discovery.BootstrapToken.APIServerEndpoint = apiServerEndpoint
}

func (k *KubeadmJoinYAML) SetToken(token string) {
	k.JoinConfiguration.Discovery.BootstrapToken.Token = token
}

func (k *KubeadmJoinYAML) AppendDiscoveryTokenCaCertHash(discoveryTokenCaCertHash string) {
	k.JoinConfiguration.Discovery.BootstrapToken.CACertHashes = append(k.JoinConfiguration.Discovery.BootstrapToken.CACertHashes, discoveryTokenCaCertHash)
}

func (k *KubeadmJoinYAML) SetNodeIP(nodeIP string) {
	if k.JoinConfiguration.NodeRegistration.KubeletExtraArgs == nil {
		k.JoinConfiguration.NodeRegistration.KubeletExtraArgs = map[string]string{"node-ip": nodeIP}
	} else {
		k.JoinConfiguration.NodeRegistration.KubeletExtraArgs["node-ip"] = nodeIP
	}
}

func (k *KubeadmJoinYAML) SetProviderID(providerID string) {
	k.KubeletConfiguration.ProviderID = providerID
}

func (k *KubeadmJoinYAML) Marshal() ([]byte, error) {
	return resources.MarshalK8SResources(k)
}

func (k *KubeadmJoinYAML) Unmarshal(yamlData []byte) (KubeadmJoinYAML, error) {
	var tmp KubeadmJoinYAML
	return tmp, resources.UnmarshalK8SResources(yamlData, &tmp)
}

type KubeadmInitYAML struct {
	InitConfiguration    kubeadm.InitConfiguration
	ClusterConfiguration kubeadm.ClusterConfiguration
	KubeletConfiguration kubeletconf.KubeletConfiguration
}

func (k *KubeadmInitYAML) SetNodeName(nodeName string) {
	k.InitConfiguration.NodeRegistration.Name = nodeName
}

func (k *KubeadmInitYAML) SetApiServerAdvertiseAddress(apiServerAdvertiseAddress string) {
	k.InitConfiguration.LocalAPIEndpoint.AdvertiseAddress = apiServerAdvertiseAddress
}

func (k *KubeadmInitYAML) SetServiceCIDR(serviceCIDR string) {
	k.ClusterConfiguration.Networking.ServiceSubnet = serviceCIDR
}

func (k *KubeadmInitYAML) SetPodNetworkCIDR(podNetworkCIDR string) {
	k.ClusterConfiguration.Networking.PodSubnet = podNetworkCIDR
}

func (k *KubeadmInitYAML) SetServiceDNSDomain(serviceDNSDomain string) {
	k.ClusterConfiguration.Networking.DNSDomain = serviceDNSDomain
}

func (k *KubeadmInitYAML) SetNodeIP(nodeIP string) {
	if k.InitConfiguration.NodeRegistration.KubeletExtraArgs == nil {
		k.InitConfiguration.NodeRegistration.KubeletExtraArgs = map[string]string{"node-ip": nodeIP}
	} else {
		k.InitConfiguration.NodeRegistration.KubeletExtraArgs["node-ip"] = nodeIP
	}
}

func (k *KubeadmInitYAML) SetProviderID(providerID string) {
	if k.InitConfiguration.NodeRegistration.KubeletExtraArgs == nil {
		k.InitConfiguration.NodeRegistration.KubeletExtraArgs = map[string]string{"provider-id": providerID}
	} else {
		k.InitConfiguration.NodeRegistration.KubeletExtraArgs["provider-id"] = providerID
	}
}

func (k *KubeadmInitYAML) Marshal() ([]byte, error) {
	return resources.MarshalK8SResources(k)
}

func (k *KubeadmInitYAML) Unmarshal(yamlData []byte) (KubeadmInitYAML, error) {
	var tmp KubeadmInitYAML
	return tmp, resources.UnmarshalK8SResources(yamlData, &tmp)
}