/*
Copyright (c) Edgeless Systems GmbH

SPDX-License-Identifier: AGPL-3.0-only
*/

/*
Package versions defines the supported versions of Constellation components.

Binaries and container image versions are pinned by their hashes, the generate tool can be found in the hash-generator subpackage.
*/
package versions

import (
	"fmt"
	"sort"
	"strings"

	"github.com/edgelesssys/constellation/v2/internal/compatibility"
	"github.com/edgelesssys/constellation/v2/internal/constants"
	"github.com/edgelesssys/constellation/v2/internal/versions/components"
	"golang.org/x/mod/semver"
)

// SupportedK8sVersions returns a list (sorted) of supported Kubernetes versions.
func SupportedK8sVersions() []string {
	validVersions := make([]string, len(VersionConfigs))
	i := 0
	for _, conf := range VersionConfigs {
		validVersions[i] = compatibility.EnsurePrefixV(conf.ClusterVersion)
		i++
	}
	validVersionsSorted := semver.ByVersion(validVersions)
	sort.Sort(validVersionsSorted)

	return validVersionsSorted
}

// ValidK8sVersion represents any of the three currently supported k8s versions.
type ValidK8sVersion string

// NewValidK8sVersion validates the given string and produces a new ValidK8sVersion object.
// It accepts a full version (e.g. 1.26.7) and validates it.
// Returns an empty string if the given version is invalid.
// strict controls whether the patch version is checked or not.
// If strict is false, the patch version validation is skipped.
func NewValidK8sVersion(k8sVersion string, strict bool) (ValidK8sVersion, error) {
	prefixedVersion := compatibility.EnsurePrefixV(k8sVersion)
	var supported bool
	if strict {
		supported = isSupportedK8sVersionStrict(prefixedVersion)
	} else {
		supported = isSupportedK8sVersion(prefixedVersion)
	}
	if !supported {
		return "", fmt.Errorf("invalid Kubernetes version: %s; supported versions are %v", prefixedVersion, SupportedK8sVersions())
	}
	return ValidK8sVersion(prefixedVersion), nil
}

// UnmarshalYAML implements the yaml.Unmarshaler interface.
func (v *ValidK8sVersion) UnmarshalYAML(unmarshal func(interface{}) error) error {
	var version string
	if err := unmarshal(&version); err != nil {
		return err
	}
	if !hasPatchVersion(version) {
		return fmt.Errorf("Kubernetes version %s does not specify a patch, supported versions are %s", version, strings.Join(SupportedK8sVersions(), ", "))
	}
	valid, err := NewValidK8sVersion(version, false) // allow any patch version to not force K8s patch upgrades
	if err != nil {
		return fmt.Errorf("unsupported Kubernetes version %s, supported versions are %s", version, strings.Join(SupportedK8sVersions(), ", "))
	}
	*v = valid
	return nil
}

// ResolveK8sPatchVersion transforms a MAJOR.MINOR definition into a supported
// MAJOR.MINOR.PATCH release.
func ResolveK8sPatchVersion(k8sVersion string) (string, error) {
	k8sVersion = compatibility.EnsurePrefixV(k8sVersion)
	if !semver.IsValid(k8sVersion) {
		return "", fmt.Errorf("Kubernetes version does not specify a valid semantic version: %s", k8sVersion)
	}
	if hasPatchVersion(k8sVersion) {
		return k8sVersion, nil
	}
	extendedVersion := k8sVersionFromMajorMinor(k8sVersion)
	if extendedVersion == "" {
		return "", fmt.Errorf("Kubernetes version %s is not valid. Supported versions: %s",
			strings.TrimPrefix(k8sVersion, "v"), supportedVersions())
	}

	return extendedVersion, nil
}

// k8sVersionFromMajorMinor takes a semver in format MAJOR.MINOR
// and returns the version in format MAJOR.MINOR.PATCH with the
// supported patch version as PATCH.
func k8sVersionFromMajorMinor(version string) string {
	switch version {
	case semver.MajorMinor(string(V1_26)):
		return string(V1_26)
	case semver.MajorMinor(string(V1_27)):
		return string(V1_27)
	case semver.MajorMinor(string(V1_28)):
		return string(V1_28)
	default:
		return ""
	}
}

// supportedVersions prints the supported version without v prefix and without patch version.
// Should only be used when accepting Kubernetes versions from --kubernetes.
func supportedVersions() string {
	builder := strings.Builder{}
	for i, version := range SupportedK8sVersions() {
		if i > 0 {
			builder.WriteString(" ")
		}
		builder.WriteString(strings.TrimPrefix(semver.MajorMinor(version), "v"))
	}
	return builder.String()
}

// IsSupportedK8sVersion checks if a given Kubernetes minor version is supported by Constellation.
// Note: the patch version is not checked!
func isSupportedK8sVersion(version string) bool {
	for _, valid := range SupportedK8sVersions() {
		if semver.MajorMinor(valid) == semver.MajorMinor(version) {
			return true
		}
	}
	return false
}

// IsSupportedK8sVersion checks if a given Kubernetes version is supported by Constellation.
func isSupportedK8sVersionStrict(version string) bool {
	for _, valid := range SupportedK8sVersions() {
		if valid == version {
			return true
		}
	}
	return false
}

// IsPreviewK8sVersion checks if a given Kubernetes version is still in preview and not fully supported.
func IsPreviewK8sVersion(_ ValidK8sVersion) bool {
	return false
}

// hasPatchVersion returns if the given version has specified a patch version.
func hasPatchVersion(version string) bool {
	return semver.MajorMinor(version) != version
}

const (
	//
	// Constellation images.
	// These images are built in a way that they support all versions currently listed in VersionConfigs.
	//

	// KonnectivityAgentImage agent image for konnectivity service.
	KonnectivityAgentImage = "registry.k8s.io/kas-network-proxy/proxy-agent:v0.1.2@sha256:cd3046d253d26ffb5907c625e0d0c2be05c5693c90e12116980851739fc0ead8" // renovate:container
	// KonnectivityServerImage server image for konnectivity service.
	KonnectivityServerImage = "registry.k8s.io/kas-network-proxy/proxy-server:v0.1.2@sha256:79933c3779bc30e33bb7509dff913e70f6ba78ad441f4827f0f3e840ce5f3ddb" // renovate:container
	// GcpGuestImage image for GCP guest agent.
	// Check for new versions at https://github.com/GoogleCloudPlatform/guest-agent/releases and update in /.github/workflows/build-gcp-guest-agent.yml.
	GcpGuestImage = "ghcr.io/edgelesssys/gcp-guest-agent:v20230811.0.0@sha256:c05d6273a1574af2564835a9cc989bed36ec3f76899f51908987263df5b0f231" // renovate:container
	// NodeMaintenanceOperatorImage is the image for the node maintenance operator.
	NodeMaintenanceOperatorImage = "quay.io/medik8s/node-maintenance-operator:v0.15.0@sha256:8cb8dad93283268282c30e75c68f4bd76b28def4b68b563d2f9db9c74225d634" // renovate:container
	// LogstashImage is the container image of logstash, used for log collection by debugd.
	LogstashImage = "ghcr.io/edgelesssys/constellation/filebeat-debugd:v2.11.0-pre.0.20230821060133-60bf770e62bc@sha256:89ea1925345922a5471f26de6bc2344a83a76f2f908a6f048230699f8b810114" // renovate:container
	// FilebeatImage is the container image of filebeat, used for log collection by debugd.
	FilebeatImage = "ghcr.io/edgelesssys/constellation/filebeat-debugd:v2.11.0-pre.0.20230821060133-60bf770e62bc@sha256:89ea1925345922a5471f26de6bc2344a83a76f2f908a6f048230699f8b810114" // renovate:container

	// currently supported versions.
	//nolint:revive
	V1_26 ValidK8sVersion = "v1.26.9" // renovate:kubernetes-release
	//nolint:revive
	V1_27 ValidK8sVersion = "v1.27.6" // renovate:kubernetes-release
	//nolint:revive
	V1_28 ValidK8sVersion = "v1.28.2" // renovate:kubernetes-release

	// Default k8s version deployed by Constellation.
	Default ValidK8sVersion = V1_27
)

// Regenerate the hashes by running go generate.
// To add another Kubernetes version, add a new entry to the VersionConfigs map below and fill the Hash field with an empty string.
//go:generate hash-generator

// VersionConfigs holds download URLs for all required kubernetes components for every supported version.
var VersionConfigs = map[ValidK8sVersion]KubernetesVersion{
	V1_26: {
		ClusterVersion: "v1.26.9", // renovate:kubernetes-release
		KubernetesComponents: components.Components{
			{
				URL:         "https://github.com/containernetworking/plugins/releases/download/v1.3.0/cni-plugins-linux-amd64-v1.3.0.tgz", // renovate:cni-plugins-release
				Hash:        "sha256:754a71ed60a4bd08726c3af705a7d55ee3df03122b12e389fdba4bea35d7dd7e",
				InstallPath: constants.CniPluginsDir,
				Extract:     true,
			},
			{
				URL:         "https://github.com/kubernetes-sigs/cri-tools/releases/download/v1.28.0/crictl-v1.28.0-linux-amd64.tar.gz", // renovate:crictl-release
				Hash:        "sha256:8dc78774f7cbeaf787994d386eec663f0a3cf24de1ea4893598096cb39ef2508",
				InstallPath: constants.BinDir,
				Extract:     true,
			},
			{
				URL:         "https://storage.googleapis.com/kubernetes-release/release/v1.26.9/bin/linux/amd64/kubelet", // renovate:kubernetes-release
				Hash:        "sha256:baa2b021ab2f90c342518e2b8981a18de7e1e6b33f11c57e3ff23d40364877a8",
				InstallPath: constants.KubeletPath,
				Extract:     false,
			},
			{
				URL:         "https://storage.googleapis.com/kubernetes-release/release/v1.26.9/bin/linux/amd64/kubeadm", // renovate:kubernetes-release
				Hash:        "sha256:73e128821dd1f799a75c922218d12f6c4618b8e29cc7dae2a7390fb80092d3d9",
				InstallPath: constants.KubeadmPath,
				Extract:     false,
			},
			{
				URL:         "https://storage.googleapis.com/kubernetes-release/release/v1.26.9/bin/linux/amd64/kubectl", // renovate:kubernetes-release
				Hash:        "sha256:98ea4a13895e54ba24f57e0d369ff6be0d3906895305d5390197069b1da12ae2",
				InstallPath: constants.KubectlPath,
				Extract:     false,
			},
		},
		// CloudControllerManagerImageAWS is the CCM image used on AWS.
		CloudControllerManagerImageAWS: "registry.k8s.io/provider-aws/cloud-controller-manager:v1.26.6@sha256:33445ab57f48938fe989ffe311dacee0044b82f2bd23cb7f7b563275926f0ce9", // renovate:container
		// CloudControllerManagerImageAzure is the CCM image used on Azure.
		// Check for newer versions at https://github.com/kubernetes-sigs/cloud-provider-azure/blob/master/README.md.
		CloudControllerManagerImageAzure: "mcr.microsoft.com/oss/kubernetes/azure-cloud-controller-manager:v1.26.13@sha256:d44cd3490d3ab7a4bf11faa4c8b918864be041f8b183dcedc75caf6fb9d1fdf1", // renovate:container
		// CloudNodeManagerImageAzure is the cloud-node-manager image used on Azure.
		// Check for newer versions at https://github.com/kubernetes-sigs/cloud-provider-azure/blob/master/README.md.
		CloudNodeManagerImageAzure: "mcr.microsoft.com/oss/kubernetes/azure-cloud-node-manager:v1.26.13@sha256:ba8c73fc49495ed69d4242eee3068609ff2752d4c3f51de740385b05a4c303f1", // renovate:container
		// CloudControllerManagerImageGCP is the CCM image used on GCP.
		// TODO(3u13r): use newer "cloud-provider-gcp" from https://github.com/kubernetes/cloud-provider-gcp when newer releases are available.
		CloudControllerManagerImageGCP: "ghcr.io/edgelesssys/cloud-provider-gcp:v26.4.0@sha256:dbe983cceabb3df98112b083d844229c85a1bbdfef2060c79f4cd49afe2a07f3", // renovate:container
		// CloudControllerManagerImageOpenStack is the CCM image used on OpenStack.
		CloudControllerManagerImageOpenStack: "docker.io/k8scloudprovider/openstack-cloud-controller-manager:v1.26.3@sha256:65f0945ea9fc17e64812befbf3fc52b06c13df1c3407cb8022e8110a2fe08a4a", // renovate:container
		// External service image. Depends on k8s version.
		// Check for new versions at https://github.com/kubernetes/autoscaler/releases.
		ClusterAutoscalerImage: "registry.k8s.io/autoscaling/cluster-autoscaler:v1.26.4@sha256:f771284ff54ecfedf40c7af70c5450600786c98989aeb69cdcf7e7bb7ac5a20d", // renovate:container
	},
	V1_27: {
		ClusterVersion: "v1.27.6", // renovate:kubernetes-release
		KubernetesComponents: components.Components{
			{
				URL:         "https://github.com/containernetworking/plugins/releases/download/v1.3.0/cni-plugins-linux-amd64-v1.3.0.tgz", // renovate:cni-plugins-release
				Hash:        "sha256:754a71ed60a4bd08726c3af705a7d55ee3df03122b12e389fdba4bea35d7dd7e",
				InstallPath: constants.CniPluginsDir,
				Extract:     true,
			},
			{
				URL:         "https://github.com/kubernetes-sigs/cri-tools/releases/download/v1.28.0/crictl-v1.28.0-linux-amd64.tar.gz", // renovate:crictl-release
				Hash:        "sha256:8dc78774f7cbeaf787994d386eec663f0a3cf24de1ea4893598096cb39ef2508",
				InstallPath: constants.BinDir,
				Extract:     true,
			},
			{
				URL:         "https://storage.googleapis.com/kubernetes-release/release/v1.27.6/bin/linux/amd64/kubelet", // renovate:kubernetes-release
				Hash:        "sha256:daa42f9b6f5e2176bbce0d24d89a05613000630bcddec1fafd2a8d42a523ce9d",
				InstallPath: constants.KubeletPath,
				Extract:     false,
			},
			{
				URL:         "https://storage.googleapis.com/kubernetes-release/release/v1.27.6/bin/linux/amd64/kubeadm", // renovate:kubernetes-release
				Hash:        "sha256:2bcdd68957ec25d0689bb56f32b4ec86e38463d2691d5ea21cd109c7afa3aa7c",
				InstallPath: constants.KubeadmPath,
				Extract:     false,
			},
			{
				URL:         "https://storage.googleapis.com/kubernetes-release/release/v1.27.6/bin/linux/amd64/kubectl", // renovate:kubernetes-release
				Hash:        "sha256:2b7adb71c8630904da1b94e262c8c3c477e9609b3c0ed8ae1213a1e156ae38dd",
				InstallPath: constants.KubectlPath,
				Extract:     false,
			},
		},
		// CloudControllerManagerImageAWS is the CCM image used on AWS.
		CloudControllerManagerImageAWS: "registry.k8s.io/provider-aws/cloud-controller-manager:v1.27.2@sha256:42be09a2b13b4e69b42905639d6b005ebe1ca490aabefad427256abf2cc892c7", // renovate:container
		// CloudControllerManagerImageAzure is the CCM image used on Azure.
		// Check for newer versions at https://github.com/kubernetes-sigs/cloud-provider-azure/blob/master/README.md.
		CloudControllerManagerImageAzure: "mcr.microsoft.com/oss/kubernetes/azure-cloud-controller-manager:v1.27.7@sha256:e27c4ddc8b9efdac8509a2f681eaa98152309f6b2f08d14230b11c60a9b8b87f", // renovate:container
		// CloudNodeManagerImageAzure is the cloud-node-manager image used on Azure.
		// Check for newer versions at https://github.com/kubernetes-sigs/cloud-provider-azure/blob/master/README.md.
		CloudNodeManagerImageAzure: "mcr.microsoft.com/oss/kubernetes/azure-cloud-node-manager:v1.27.7@sha256:998453989b03ac6c24e53aabbf271fa181e054b3a061fe6caa565186ae79bd0c", // renovate:container
		// CloudControllerManagerImageGCP is the CCM image used on GCP.
		// TODO(3u13r): use newer "cloud-provider-gcp" from https://github.com/kubernetes/cloud-provider-gcp when newer releases are available.
		CloudControllerManagerImageGCP: "ghcr.io/edgelesssys/cloud-provider-gcp:v27.1.6@sha256:b097b4e5382ea1987db5996a9eaffb94fa224639b3464876f0b1b17f64509ac4", // renovate:container
		// CloudControllerManagerImageOpenStack is the CCM image used on OpenStack.
		CloudControllerManagerImageOpenStack: "docker.io/k8scloudprovider/openstack-cloud-controller-manager:v1.26.3@sha256:65f0945ea9fc17e64812befbf3fc52b06c13df1c3407cb8022e8110a2fe08a4a", // renovate:container
		// External service image. Depends on k8s version.
		// Check for new versions at https://github.com/kubernetes/autoscaler/releases.
		ClusterAutoscalerImage: "registry.k8s.io/autoscaling/cluster-autoscaler:v1.27.3@sha256:0e1ab1bfeb1beaa82f59356ef36364503df22aeb8f8d0d7383bac449b4e808fb", // renovate:container
	},
	V1_28: {
		ClusterVersion: "v1.28.2", // renovate:kubernetes-release
		KubernetesComponents: components.Components{
			{
				URL:         "https://github.com/containernetworking/plugins/releases/download/v1.3.0/cni-plugins-linux-amd64-v1.3.0.tgz", // renovate:cni-plugins-release
				Hash:        "sha256:754a71ed60a4bd08726c3af705a7d55ee3df03122b12e389fdba4bea35d7dd7e",
				InstallPath: constants.CniPluginsDir,
				Extract:     true,
			},
			{
				URL:         "https://github.com/kubernetes-sigs/cri-tools/releases/download/v1.28.0/crictl-v1.28.0-linux-amd64.tar.gz", // renovate:crictl-release
				Hash:        "sha256:8dc78774f7cbeaf787994d386eec663f0a3cf24de1ea4893598096cb39ef2508",
				InstallPath: constants.BinDir,
				Extract:     true,
			},
			{
				URL:         "https://storage.googleapis.com/kubernetes-release/release/v1.28.2/bin/linux/amd64/kubelet", // renovate:kubernetes-release
				Hash:        "sha256:17edb866636f14eceaad58c56eab12af7ab3be3c78400aff9680635d927f1185",
				InstallPath: constants.KubeletPath,
				Extract:     false,
			},
			{
				URL:         "https://storage.googleapis.com/kubernetes-release/release/v1.28.2/bin/linux/amd64/kubeadm", // renovate:kubernetes-release
				Hash:        "sha256:6a4808230661c69431143db2e200ea2d021c7f1b1085e6353583075471310d00",
				InstallPath: constants.KubeadmPath,
				Extract:     false,
			},
			{
				URL:         "https://storage.googleapis.com/kubernetes-release/release/v1.28.2/bin/linux/amd64/kubectl", // renovate:kubernetes-release
				Hash:        "sha256:c922440b043e5de1afa3c1382f8c663a25f055978cbc6e8423493ec157579ec5",
				InstallPath: constants.KubectlPath,
				Extract:     false,
			},
		},
		// CloudControllerManagerImageAWS is the CCM image used on AWS.
		CloudControllerManagerImageAWS: "registry.k8s.io/provider-aws/cloud-controller-manager:v1.28.0@sha256:47eb1c1e6a3bd6d0fb44ac4992885b6218f1448ea339de778d8b703df463c06f", // renovate:container
		// CloudControllerManagerImageAzure is the CCM image used on Azure.
		// Check for newer versions at https://github.com/kubernetes-sigs/cloud-provider-azure/blob/master/README.md.
		CloudControllerManagerImageAzure: "mcr.microsoft.com/oss/kubernetes/azure-cloud-controller-manager:v1.27.7@sha256:e27c4ddc8b9efdac8509a2f681eaa98152309f6b2f08d14230b11c60a9b8b87f", // renovate:container
		// CloudNodeManagerImageAzure is the cloud-node-manager image used on Azure.
		// Check for newer versions at https://github.com/kubernetes-sigs/cloud-provider-azure/blob/master/README.md.
		CloudNodeManagerImageAzure: "mcr.microsoft.com/oss/kubernetes/azure-cloud-node-manager:v1.27.7@sha256:998453989b03ac6c24e53aabbf271fa181e054b3a061fe6caa565186ae79bd0c", // renovate:container
		// CloudControllerManagerImageGCP is the CCM image used on GCP.
		// TODO(3u13r): use newer "cloud-provider-gcp" from https://github.com/kubernetes/cloud-provider-gcp when newer releases are available.
		CloudControllerManagerImageGCP: "ghcr.io/edgelesssys/cloud-provider-gcp:v27.1.6@sha256:b097b4e5382ea1987db5996a9eaffb94fa224639b3464876f0b1b17f64509ac4", // renovate:container
		// CloudControllerManagerImageOpenStack is the CCM image used on OpenStack.
		CloudControllerManagerImageOpenStack: "docker.io/k8scloudprovider/openstack-cloud-controller-manager:v1.26.3@sha256:65f0945ea9fc17e64812befbf3fc52b06c13df1c3407cb8022e8110a2fe08a4a", // renovate:container
		// External service image. Depends on k8s version.
		// Check for new versions at https://github.com/kubernetes/autoscaler/releases.
		ClusterAutoscalerImage: "registry.k8s.io/autoscaling/cluster-autoscaler:v1.27.3@sha256:0e1ab1bfeb1beaa82f59356ef36364503df22aeb8f8d0d7383bac449b4e808fb", // renovate:container
	},
}

// KubernetesVersion bundles download URLs to all version-releated binaries necessary for installing/deploying a particular Kubernetes version.
type KubernetesVersion struct {
	ClusterVersion                       string
	KubernetesComponents                 components.Components
	CloudControllerManagerImageAWS       string // k8s version dependency.
	CloudControllerManagerImageAzure     string // k8s version dependency.
	CloudControllerManagerImageGCP       string // Using self-built image until resolved: https://github.com/kubernetes/cloud-provider-gcp/issues/289
	CloudControllerManagerImageOpenStack string // k8s version dependency.
	CloudNodeManagerImageAzure           string // k8s version dependency. Same version as above.
	ClusterAutoscalerImage               string // Matches k8s versioning scheme.
}

// versionFromDockerImage returns the version tag from the image name, e.g. "v1.22.2" from "foocr.io/org/repo:v1.22.2@sha256:3009fj0...".
func versionFromDockerImage(imageName string) string {
	beforeAt, _, _ := strings.Cut(imageName, "@")
	_, version, ok := strings.Cut(beforeAt, ":")
	if !ok {
		panic(fmt.Errorf("failed to extract version from image name, no ':' found in %s", imageName))
	}
	return version
}