/*
Copyright 2021 The Dapr 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 kubernetes

import (
	"context"
	"fmt"
	"os"
	"path/filepath"
	"strings"
	"time"

	helm "helm.sh/helm/v3/pkg/action"
	"helm.sh/helm/v3/pkg/chart"
	"helm.sh/helm/v3/pkg/chart/loader"
	"helm.sh/helm/v3/pkg/cli"
	v1 "k8s.io/api/core/v1"
	meta_v1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	"k8s.io/cli-runtime/pkg/genericclioptions"
	"k8s.io/helm/pkg/strvals"

	"github.com/dapr/cli/pkg/print"
	cli_ver "github.com/dapr/cli/pkg/version"
	"github.com/dapr/cli/utils"
)

const (
	daprReleaseName      = "dapr"
	dashboardReleaseName = "dapr-dashboard"
	daprHelmRepo         = "https://dapr.github.io/helm-charts"
	latestVersion        = "latest"
)

type InitConfiguration struct {
	Version                   string
	DashboardVersion          string
	Namespace                 string
	EnableMTLS                bool
	EnableHA                  bool
	Args                      []string
	Wait                      bool
	Timeout                   uint
	ImageRegistryURI          string
	ImageVariant              string
	RootCertificateFilePath   string
	IssuerCertificateFilePath string
	IssuerPrivateKeyFilePath  string
}

// Init deploys the Dapr operator using the supplied runtime version.
func Init(config InitConfiguration) error {
	err := installWithConsole(daprReleaseName, config.Version, "Dapr control plane", config)
	if err != nil {
		return err
	}

	for _, dashboardClusterRole := range []string{"dashboard-reader", "dapr-dashboard"} {
		// Detect Dapr Dashboard using a cluster-level resource (not dependent on namespace).
		_, err = utils.RunCmdAndWait("kubectl", "describe", "clusterrole", dashboardClusterRole)
		if err == nil {
			// No need to install Dashboard since it is already present.
			// Charts for versions < 1.11 contain Dashboard already.
			return nil
		}
	}

	err = installWithConsole(dashboardReleaseName, config.DashboardVersion, "Dapr dashboard", config)
	if err != nil {
		return err
	}

	return nil
}

func installWithConsole(releaseName string, releaseVersion string, prettyName string, config InitConfiguration) error {
	installSpinning := print.Spinner(os.Stdout, "Deploying the "+prettyName+" with "+releaseVersion+" version to your cluster...")
	defer installSpinning(print.Failure)

	err := install(releaseName, releaseVersion, config)
	if err != nil {
		return err
	}
	installSpinning(print.Success)

	return nil
}

func createNamespace(namespace string) error {
	_, client, err := GetKubeConfigClient()
	if err != nil {
		return fmt.Errorf("can't connect to a Kubernetes cluster: %w", err)
	}

	ns := &v1.Namespace{
		ObjectMeta: meta_v1.ObjectMeta{
			Name: namespace,
		},
	}
	// try to create the namespace if it doesn't exist. ok to ignore error.
	client.CoreV1().Namespaces().Create(context.TODO(), ns, meta_v1.CreateOptions{})
	return nil
}

func helmConfig(namespace string) (*helm.Configuration, error) {
	ac := helm.Configuration{}
	flags := &genericclioptions.ConfigFlags{
		Namespace: &namespace,
	}
	err := ac.Init(flags, namespace, "secret", debugLogf)
	return &ac, err
}

func getVersion(releaseName string, version string) (string, error) {
	actualVersion := version
	if version == latestVersion {
		var err error
		if releaseName == daprReleaseName {
			actualVersion, err = cli_ver.GetDaprVersion()
		} else if releaseName == dashboardReleaseName {
			actualVersion, err = cli_ver.GetDashboardVersion()
		} else {
			return "", fmt.Errorf("cannot get latest version for unknown chart: %s", releaseName)
		}
		if err != nil {
			return "", fmt.Errorf("cannot get the latest release version: %w", err)
		}
		actualVersion = strings.TrimPrefix(actualVersion, "v")
	}
	return actualVersion, nil
}

func createTempDir() (string, error) {
	dir, err := os.MkdirTemp("", "dapr")
	if err != nil {
		return "", fmt.Errorf("error creating temp dir: %w", err)
	}
	return dir, nil
}

func locateChartFile(dirPath string) (string, error) {
	files, err := os.ReadDir(dirPath)
	if err != nil {
		return "", err
	}
	return filepath.Join(dirPath, files[0].Name()), nil
}

func daprChart(version string, releaseName string, config *helm.Configuration) (*chart.Chart, error) {
	pull := helm.NewPullWithOpts(helm.WithConfig(config))
	pull.RepoURL = utils.GetEnv("DAPR_HELM_REPO_URL", daprHelmRepo)
	pull.Username = utils.GetEnv("DAPR_HELM_REPO_USERNAME", "")
	pull.Password = utils.GetEnv("DAPR_HELM_REPO_PASSWORD", "")

	pull.Settings = &cli.EnvSettings{}

	if version != latestVersion && releaseName == daprReleaseName {
		pull.Version = chartVersion(version)
	}

	dir, err := createTempDir()
	if err != nil {
		return nil, err
	}
	defer os.RemoveAll(dir)

	pull.DestDir = dir

	_, err = pull.Run(releaseName)
	if err != nil {
		return nil, err
	}

	chartPath, err := locateChartFile(dir)
	if err != nil {
		return nil, err
	}
	return loader.Load(chartPath)
}

func chartValues(config InitConfiguration, version string) (map[string]interface{}, error) {
	chartVals := map[string]interface{}{}
	err := utils.ValidateImageVariant(config.ImageVariant)
	if err != nil {
		return nil, err
	}
	helmVals := []string{
		fmt.Sprintf("global.ha.enabled=%t", config.EnableHA),
		fmt.Sprintf("global.mtls.enabled=%t", config.EnableMTLS),
		fmt.Sprintf("global.tag=%s", utils.GetVariantVersion(version, config.ImageVariant)),
	}
	if len(config.ImageRegistryURI) != 0 {
		helmVals = append(helmVals, fmt.Sprintf("global.registry=%s", config.ImageRegistryURI))
	}
	helmVals = append(helmVals, config.Args...)

	if config.RootCertificateFilePath != "" && config.IssuerCertificateFilePath != "" && config.IssuerPrivateKeyFilePath != "" {
		rootCertBytes, issuerCertBytes, issuerKeyBytes, err := parseCertificateFiles(
			config.RootCertificateFilePath,
			config.IssuerCertificateFilePath,
			config.IssuerPrivateKeyFilePath,
		)
		if err != nil {
			return nil, err
		}
		helmVals = append(helmVals, fmt.Sprintf("dapr_sentry.tls.root.certPEM=%s", string(rootCertBytes)),
			fmt.Sprintf("dapr_sentry.tls.issuer.certPEM=%s", string(issuerCertBytes)),
			fmt.Sprintf("dapr_sentry.tls.issuer.keyPEM=%s", string(issuerKeyBytes)),
		)
	}

	for _, v := range helmVals {
		if err := strvals.ParseInto(v, chartVals); err != nil {
			return nil, err
		}
	}
	return chartVals, nil
}

func install(releaseName string, releaseVersion string, config InitConfiguration) error {
	err := createNamespace(config.Namespace)
	if err != nil {
		return err
	}

	helmConf, err := helmConfig(config.Namespace)
	if err != nil {
		return err
	}

	daprChart, err := daprChart(releaseVersion, releaseName, helmConf)
	if err != nil {
		return err
	}

	version, err := getVersion(releaseName, releaseVersion)
	if err != nil {
		return err
	}

	if releaseName == daprReleaseName {
		err = applyCRDs(fmt.Sprintf("v%s", version))
		if err != nil {
			return err
		}
	}

	installClient := helm.NewInstall(helmConf)
	installClient.ReleaseName = releaseName
	installClient.Namespace = config.Namespace
	installClient.Wait = config.Wait
	installClient.Timeout = time.Duration(config.Timeout) * time.Second

	values, err := chartValues(config, version)
	if err != nil {
		return err
	}

	if _, err = installClient.Run(daprChart, values); err != nil {
		return err
	}

	return nil
}

func debugLogf(format string, v ...interface{}) {
}

func confirmExist(cfg *helm.Configuration) (bool, error) {
	client := helm.NewGet(cfg)
	release, err := client.Run(daprReleaseName)

	if release == nil {
		return false, nil
	}

	if err != nil {
		return false, err
	}

	return true, nil
}