/*
Copyright 2021 The KubeVela Authors.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

package common

import (
	"context"
	"encoding/json"
	"errors"
	"fmt"
	"io/ioutil"
	"os"
	"path/filepath"
	"strings"

	"github.com/oam-dev/kubevela/pkg/utils/common"

	corev1 "k8s.io/api/core/v1"

	"github.com/ghodss/yaml"
	apierrors "k8s.io/apimachinery/pkg/api/errors"
	v1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	"k8s.io/apimachinery/pkg/runtime"
	"sigs.k8s.io/controller-runtime/pkg/client"

	"github.com/oam-dev/kubevela/apis/core.oam.dev/v1beta1"
	"github.com/oam-dev/kubevela/apis/types"
	"github.com/oam-dev/kubevela/pkg/oam/discoverymapper"
	"github.com/oam-dev/kubevela/pkg/oam/util"
	"github.com/oam-dev/kubevela/pkg/utils/helm"
	"github.com/oam-dev/kubevela/pkg/utils/system"
	cmdutil "github.com/oam-dev/kubevela/pkg/utils/util"
	"github.com/oam-dev/kubevela/references/apiserver/apis"
	"github.com/oam-dev/kubevela/references/plugins"
)

// AddCapabilityCenter will add a cap center
func AddCapabilityCenter(capName, capURL, capToken string) error {
	repos, err := plugins.LoadRepos()
	if err != nil {
		return err
	}
	config := &plugins.CapCenterConfig{
		Name:    capName,
		Address: capURL,
		Token:   capToken,
	}
	var updated bool
	for idx, r := range repos {
		if r.Name == config.Name {
			repos[idx] = *config
			updated = true
			break
		}
	}
	if !updated {
		repos = append(repos, *config)
	}
	if err = plugins.StoreRepos(repos); err != nil {
		return err
	}
	return SyncCapabilityFromCenter(capName, capURL, capToken)
}

// SyncCapabilityFromCenter will sync all capabilities from center
func SyncCapabilityFromCenter(capName, capURL, capToken string) error {
	client, err := plugins.NewCenterClient(context.Background(), capName, capURL, capToken)
	if err != nil {
		return err
	}
	return client.SyncCapabilityFromCenter()
}

// AddCapabilityIntoCluster will add a capability into K8s cluster, it is equal to apply a definition yaml and run `vela workloads/traits`
func AddCapabilityIntoCluster(c client.Client, mapper discoverymapper.DiscoveryMapper, capability string) (string, error) {
	ss := strings.Split(capability, "/")
	if len(ss) < 2 {
		return "", errors.New("invalid format for " + capability + ", please follow format <center>/<name>")
	}
	repoName := ss[0]
	name := ss[1]
	ioStreams := cmdutil.IOStreams{In: os.Stdin, Out: os.Stdout, ErrOut: os.Stderr}
	if err := InstallCapability(c, mapper, repoName, name, ioStreams); err != nil {
		return "", err
	}
	return fmt.Sprintf("Successfully installed capability %s from %s", name, repoName), nil
}

// InstallCapability will add a cap into K8s cluster and install it's controller(helm charts)
func InstallCapability(client client.Client, mapper discoverymapper.DiscoveryMapper, centerName, capabilityName string, ioStreams cmdutil.IOStreams) error {
	dir, _ := system.GetCapCenterDir()
	repoDir := filepath.Join(dir, centerName)
	tp, err := GetCapabilityFromCenter(mapper, centerName, capabilityName)
	if err != nil {
		return err
	}
	tp.Source = &types.Source{RepoName: centerName}
	defDir, _ := system.GetCapabilityDir()
	switch tp.Type {
	case types.TypeComponentDefinition:
		var cd v1beta1.ComponentDefinition
		workloadData, err := ioutil.ReadFile(filepath.Clean(filepath.Join(repoDir, tp.Name+".yaml")))
		if err != nil {
			return err
		}
		if err = yaml.Unmarshal(workloadData, &cd); err != nil {
			return err
		}
		cd.Namespace = types.DefaultKubeVelaNS
		ioStreams.Info("Installing component capability " + cd.Name)
		if tp.Install != nil {
			tp.Source.ChartName = tp.Install.Helm.Name
			if err = helm.InstallHelmChart(ioStreams, tp.Install.Helm); err != nil {
				return err
			}
			err = addSourceIntoExtension(cd.Spec.Extension, tp.Source)
			if err != nil {
				return err
			}
		}
		if cd.Spec.Workload.Type == "" {
			tp.CrdInfo = &types.CRDInfo{
				APIVersion: cd.Spec.Workload.Definition.APIVersion,
				Kind:       cd.Spec.Workload.Definition.Kind,
			}
		}
		if err = client.Create(context.Background(), &cd); err != nil && !apierrors.IsAlreadyExists(err) {
			return err
		}
	case types.TypeTrait:
		var td v1beta1.TraitDefinition
		traitdata, err := ioutil.ReadFile(filepath.Clean(filepath.Join(repoDir, tp.Name+".yaml")))
		if err != nil {
			return err
		}
		if err = yaml.Unmarshal(traitdata, &td); err != nil {
			return err
		}
		td.Namespace = types.DefaultKubeVelaNS
		ioStreams.Info("Installing trait capability " + td.Name)
		if tp.Install != nil {
			tp.Source.ChartName = tp.Install.Helm.Name
			if err = helm.InstallHelmChart(ioStreams, tp.Install.Helm); err != nil {
				return err
			}
			err = addSourceIntoExtension(td.Spec.Extension, tp.Source)
			if err != nil {
				return err
			}
		}
		if err = HackForStandardTrait(tp, client); err != nil {
			return err
		}
		gvk, err := util.GetGVKFromDefinition(mapper, td.Spec.Reference)
		if err != nil {
			return err
		}
		tp.CrdInfo = &types.CRDInfo{
			APIVersion: gvk.GroupVersion().String(),
			Kind:       gvk.Kind,
		}
		if err = client.Create(context.Background(), &td); err != nil && !apierrors.IsAlreadyExists(err) {
			return err
		}
	case types.TypeScope:
		// TODO(wonderflow): support install scope here
	case types.TypeWorkload:
		return fmt.Errorf("unsupported capability type %v", types.TypeWorkload)
	}

	success := plugins.SinkTemp2Local([]types.Capability{tp}, defDir)
	if success == 1 {
		ioStreams.Infof("Successfully installed capability %s from %s\n", capabilityName, centerName)
	}
	return nil
}

// HackForStandardTrait will do some hack install for standard capability
func HackForStandardTrait(tp types.Capability, client client.Client) error {
	switch tp.Name {
	case "metrics":
		// metrics trait will rely on a Prometheus instance to be installed
		// make sure the chart is a prometheus operator
		if tp.Install == nil {
			break
		}
		if tp.Install.Helm.Namespace == "monitoring" && tp.Install.Helm.Name == "kube-prometheus-stack" {
			if err := InstallPrometheusInstance(client); err != nil {
				return err
			}
		}
	default:
	}
	return nil
}

// GetCapabilityFromCenter will list all synced capabilities from cap center and return the specified one
func GetCapabilityFromCenter(mapper discoverymapper.DiscoveryMapper, repoName, addonName string) (types.Capability, error) {
	dir, _ := system.GetCapCenterDir()
	repoDir := filepath.Join(dir, repoName)
	templates, err := plugins.LoadCapabilityFromSyncedCenter(mapper, repoDir)
	if err != nil {
		return types.Capability{}, err
	}
	for _, t := range templates {
		if t.Name == addonName {
			return t, nil
		}
	}
	return types.Capability{}, fmt.Errorf("%s/%s not exist, try 'vela cap center sync %s' to sync from remote", repoName, addonName, repoName)
}

// ListCapabilityCenters will list all capabilities from center
func ListCapabilityCenters() ([]apis.CapabilityCenterMeta, error) {
	var capabilityCenterList []apis.CapabilityCenterMeta
	centers, err := plugins.LoadRepos()
	if err != nil {
		return capabilityCenterList, err
	}
	for _, c := range centers {
		capabilityCenterList = append(capabilityCenterList, apis.CapabilityCenterMeta{
			Name: c.Name,
			URL:  c.Address,
		})
	}
	return capabilityCenterList, nil
}

// SyncCapabilityCenter will sync capabilities from center to local
func SyncCapabilityCenter(capabilityCenterName string) error {
	repos, err := plugins.LoadRepos()
	if err != nil {
		return err
	}
	if len(repos) == 0 {
		return fmt.Errorf("no capability center configured")
	}
	find := false
	if capabilityCenterName != "" {
		for idx, r := range repos {
			if r.Name == capabilityCenterName {
				repos = []plugins.CapCenterConfig{repos[idx]}
				find = true
				break
			}
		}
		if !find {
			return fmt.Errorf("%s center not exist", capabilityCenterName)
		}
	}
	ctx := context.Background()
	for _, d := range repos {
		client, err := plugins.NewCenterClient(ctx, d.Name, d.Address, d.Token)
		if err != nil {
			return err
		}
		err = client.SyncCapabilityFromCenter()
		if err != nil {
			return err
		}
	}
	return nil
}

// RemoveCapabilityFromCluster will remove a capability from cluster.
// 1. remove definition 2. uninstall chart 3. remove local files
func RemoveCapabilityFromCluster(userNamespace string, c common.Args, client client.Client, capabilityName string) (string, error) {
	ioStreams := cmdutil.IOStreams{In: os.Stdin, Out: os.Stdout, ErrOut: os.Stderr}
	if err := RemoveCapability(userNamespace, c, client, capabilityName, ioStreams); err != nil {
		return "", err
	}
	msg := fmt.Sprintf("%s removed successfully", capabilityName)
	return msg, nil
}

// RemoveCapability will remove a capability from cluster.
// 1. remove definition 2. uninstall chart 3. remove local files
func RemoveCapability(userNamespace string, c common.Args, client client.Client, capabilityName string, ioStreams cmdutil.IOStreams) error {
	// TODO(wonderflow): make sure no apps is using this capability
	caps, err := plugins.LoadAllInstalledCapability(userNamespace, c)
	if err != nil {
		return err
	}
	for _, w := range caps {
		if w.Name == capabilityName {
			return uninstallCap(client, w, ioStreams)
		}
	}
	return errors.New(capabilityName + " not exist")
}

func uninstallCap(client client.Client, cap types.Capability, ioStreams cmdutil.IOStreams) error {
	// 1. Remove WorkloadDefinition or TraitDefinition
	ctx := context.Background()
	var obj runtime.Object
	switch cap.Type {
	case types.TypeTrait:
		obj = &v1beta1.TraitDefinition{ObjectMeta: v1.ObjectMeta{Name: cap.Name, Namespace: types.DefaultKubeVelaNS}}
	case types.TypeWorkload:
		obj = &v1beta1.WorkloadDefinition{ObjectMeta: v1.ObjectMeta{Name: cap.Name, Namespace: types.DefaultKubeVelaNS}}
	case types.TypeScope:
		return fmt.Errorf("uninstall scope capability was not supported yet")
	case types.TypeComponentDefinition:
		obj = &v1beta1.ComponentDefinition{ObjectMeta: v1.ObjectMeta{Name: cap.Name, Namespace: types.DefaultKubeVelaNS}}
	}
	if err := client.Delete(ctx, obj); err != nil {
		return err
	}

	if cap.Install != nil && cap.Install.Helm.Name != "" {
		// 2. Remove Helm chart if there is
		if cap.Install.Helm.Namespace == "" {
			cap.Install.Helm.Namespace = types.DefaultKubeVelaNS
		}
		if err := helm.Uninstall(ioStreams, cap.Install.Helm.Name, cap.Install.Helm.Namespace, cap.Name); err != nil {
			return err
		}
	}

	// 3. Remove local capability file
	capdir, _ := system.GetCapabilityDir()
	switch cap.Type {
	case types.TypeTrait:
		if err := os.Remove(filepath.Join(capdir, "traits", cap.Name)); err != nil {
			return err
		}
	case types.TypeWorkload:
		if err := os.Remove(filepath.Join(capdir, "workloads", cap.Name)); err != nil {
			return err
		}
	case types.TypeScope:
		// TODO(wonderflow): add scope remove here.
	case types.TypeComponentDefinition:
		if err := os.Remove(filepath.Join(capdir, "components", cap.Name)); err != nil {
			return err
		}
	}
	ioStreams.Infof("Successfully uninstalled capability %s", cap.Name)
	return nil
}

// ListCapabilities will list all caps from specified center
func ListCapabilities(userNamespace string, c common.Args, capabilityCenterName string) ([]types.Capability, error) {
	var capabilityList []types.Capability
	dir, err := system.GetCapCenterDir()
	if err != nil {
		return capabilityList, err
	}
	if capabilityCenterName != "" {
		return listCenterCapabilities(userNamespace, c, filepath.Join(dir, capabilityCenterName))
	}
	dirs, err := ioutil.ReadDir(dir)
	if err != nil {
		return capabilityList, err
	}
	for _, dd := range dirs {
		if !dd.IsDir() {
			continue
		}
		caps, err := listCenterCapabilities(userNamespace, c, filepath.Join(dir, dd.Name()))
		if err != nil {
			return capabilityList, err
		}
		capabilityList = append(capabilityList, caps...)
	}
	return capabilityList, nil
}

func listCenterCapabilities(userNamespace string, c common.Args, repoDir string) ([]types.Capability, error) {
	dm, err := c.GetDiscoveryMapper()
	if err != nil {
		return nil, err
	}
	templates, err := plugins.LoadCapabilityFromSyncedCenter(dm, repoDir)
	if err != nil {
		return templates, err
	}
	if len(templates) < 1 {
		return templates, nil
	}
	baseDir := filepath.Base(repoDir)
	workloads := gatherComponents(userNamespace, c, templates)
	for i, p := range templates {
		status := checkInstallStatus(userNamespace, c, baseDir, p)
		convertedApplyTo := ConvertApplyTo(p.AppliesTo, workloads)
		templates[i].Center = baseDir
		templates[i].Status = status
		templates[i].AppliesTo = convertedApplyTo
	}
	return templates, nil
}

// RemoveCapabilityCenter will remove a cap center from local
func RemoveCapabilityCenter(centerName string) (string, error) {
	var message string
	var err error
	dir, _ := system.GetCapCenterDir()
	repoDir := filepath.Join(dir, centerName)
	// 1.remove capability center dir
	if _, err := os.Stat(repoDir); err != nil {
		if os.IsNotExist(err) {
			err = fmt.Errorf("%s capability center has not successfully synced", centerName)
			return message, err
		}
	}
	if err = os.RemoveAll(repoDir); err != nil {
		return message, err
	}
	// 2.remove center from capability center config
	repos, err := plugins.LoadRepos()
	if err != nil {
		return message, err
	}
	for idx, r := range repos {
		if r.Name == centerName {
			repos = append(repos[:idx], repos[idx+1:]...)
			break
		}
	}
	if err = plugins.StoreRepos(repos); err != nil {
		return message, err
	}
	message = fmt.Sprintf("%s capability center removed successfully", centerName)
	return message, err
}

func gatherComponents(userNamespace string, c common.Args, templates []types.Capability) []types.Capability {
	workloads, err := plugins.LoadInstalledCapabilityWithType(userNamespace, c, types.TypeComponentDefinition)
	if err != nil {
		workloads = make([]types.Capability, 0)
	}
	for _, t := range templates {
		if t.Type == types.TypeComponentDefinition {
			workloads = append(workloads, t)
		}
	}
	return workloads
}

func checkInstallStatus(userNamespace string, c common.Args, repoName string, tmp types.Capability) string {
	var status = "uninstalled"
	installed, _ := plugins.LoadInstalledCapabilityWithType(userNamespace, c, tmp.Type)
	for _, i := range installed {
		if i.Source != nil && i.Source.RepoName == repoName && i.Name == tmp.Name && i.CrdName == tmp.CrdName {
			return "installed"
		}
	}
	return status
}

func addSourceIntoExtension(in *runtime.RawExtension, source *types.Source) error {
	var extension map[string]interface{}
	err := json.Unmarshal(in.Raw, &extension)
	if err != nil {
		return err
	}
	extension["source"] = source
	data, err := json.Marshal(extension)
	if err != nil {
		return err
	}
	in.Raw = data
	return nil
}

// GetCapabilityConfigMap gets the ConfigMap which stores the information of a capability
func GetCapabilityConfigMap(kubeClient client.Client, capabilityName string) (corev1.ConfigMap, error) {
	cmName := fmt.Sprintf("%s%s", types.CapabilityConfigMapNamePrefix, capabilityName)
	var cm corev1.ConfigMap
	err := kubeClient.Get(context.Background(), client.ObjectKey{Namespace: types.DefaultKubeVelaNS, Name: cmName}, &cm)
	return cm, err
}