// Copyright (c) Microsoft Corporation.
// Licensed under the MIT License.

package main

import (
	"context"
	"flag"
	"os"
	"time"

	"github.com/Azure/Orkestra/pkg/utils"
	"github.com/Azure/Orkestra/pkg/workflow"

	"github.com/Azure/Orkestra/pkg/registry"
	"k8s.io/apimachinery/pkg/runtime"
	clientgoscheme "k8s.io/client-go/kubernetes/scheme"
	_ "k8s.io/client-go/plugin/pkg/client/auth/gcp"
	ctrl "sigs.k8s.io/controller-runtime"
	"sigs.k8s.io/controller-runtime/pkg/log/zap"

	orkestrav1alpha1 "github.com/Azure/Orkestra/api/v1alpha1"
	"github.com/Azure/Orkestra/controllers"
	v1alpha13 "github.com/argoproj/argo-workflows/v3/pkg/apis/workflow/v1alpha1"
	fluxhelmv2beta1 "github.com/fluxcd/helm-controller/api/v2beta1"
	// +kubebuilder:scaffold:imports
)

const (
	stagingRepoURLEnv = "STAGING_REPO_URL"
)

var (
	scheme   = runtime.NewScheme()
	setupLog = ctrl.Log.WithName("setup")
)

func init() {
	_ = clientgoscheme.AddToScheme(scheme)

	_ = orkestrav1alpha1.AddToScheme(scheme)
	// +kubebuilder:scaffold:scheme

	// Add Argo Workflow scheme to operator
	_ = v1alpha13.AddToScheme(scheme)

	// Add HelmRelease scheme to operator
	_ = fluxhelmv2beta1.AddToScheme(scheme)
}

func main() {
	var (
		metricsAddr             string
		enableLeaderElection    bool
		configPath              string
		stagingRepoURL          string
		tempChartStoreTargetDir string
		disableRemediation      bool
		cleanupDownloadedCharts bool
		debug                   bool
		workflowParallelism     int64
		logLevel                int
		enableZapLogDevMode     bool
	)

	flag.StringVar(&metricsAddr, "metrics-addr", ":8081", "The address the metric endpoint binds to.")
	flag.BoolVar(&enableLeaderElection, "enable-leader-election", false,
		"Enable leader election for controller manager. "+
			"Enabling this will ensure there is only one active controller manager.")
	flag.StringVar(&configPath, "config", "", "The path to the controller config file")
	flag.StringVar(&stagingRepoURL, "staging-repo-url", "", "The URL for the helm registry used for staging artifacts (ENV - STAGING_REPO_URL). NOTE: Flag overrides env value")
	flag.StringVar(&tempChartStoreTargetDir, "chart-store-path", "", "The temporary storage path for the downloaded and staged chart artifacts")
	flag.BoolVar(&disableRemediation, "disable-remediation", false, "Disable the remediation (delete/rollback) of the workflow on failure (useful if you wish to debug failures in the workflow/executor container")
	flag.BoolVar(&cleanupDownloadedCharts, "cleanup-downloaded-charts", false, "Enable/disable the cleanup of the charts downloaded to the chart-store-path")
	flag.BoolVar(&debug, "debug", false, "Enable debug run of the appgroup controller")
	flag.Int64Var(&workflowParallelism, "workflow-parallelism", 10, "Specifies the max number of workflow pods that can be executed in parallel")
	flag.IntVar(&logLevel, "log-level", 0, "Log Level")
	flag.Parse()

	if logLevel < 0 {
		enableZapLogDevMode = true
	}
	ctrl.SetLogger(zap.New(zap.UseDevMode(enableZapLogDevMode)))

	// Start the probe at the very beginning
	probe, err := utils.ProbeHandler(stagingRepoURL, "health")
	if err != nil {
		setupLog.Error(err, "unable to start readiness/liveness probes", "controller", "ApplicationGroup")
		os.Exit(1)
	}

	probe.Start("8086")

	ctrl.Log.V(logLevel)

	mgr, err := ctrl.NewManager(ctrl.GetConfigOrDie(), ctrl.Options{
		Scheme:             scheme,
		MetricsBindAddress: metricsAddr,
		Port:               9443,
		LeaderElection:     enableLeaderElection,
		LeaderElectionID:   "fdcf4a0d.azure.microsoft.com",
	})
	if err != nil {
		setupLog.Error(err, "unable to start manager")
		os.Exit(1)
	}

	// Grabbing the values based on the passed helm flags, these values change if we run in debug mode
	stagingHelmURL, workflowHelmURL, tempChartStoreTargetDir := getValues(stagingRepoURL, tempChartStoreTargetDir, debug)

	if stagingHelmURL == "" {
		s := os.Getenv(stagingRepoURLEnv)
		if s == "" {
			setupLog.Error(err, "staging repo URL must be set")
			os.Exit(1)
		}
		stagingHelmURL = s
	}

	rc, err := registry.NewClient(
		ctrl.Log,
		registry.TargetDir(tempChartStoreTargetDir),
	)
	if err != nil {
		setupLog.Error(err, "unable to create new registry client", "controller", "registry-client")
		os.Exit(1)
	}

	// Register the staging helm repository/registry
	// We perform retry on this so that we don't go into a crash loop backoff
	retryChan := make(chan bool)
	retryCtx, cancel := context.WithTimeout(context.Background(), time.Minute*5)
	go func() {
		for {
			err = rc.AddRepo(&registry.Config{
				Name: "staging",
				URL:  stagingHelmURL,
			})
			if err != nil {
				setupLog.Error(err, "failed to add staging helm repo, retrying...")
				time.Sleep(time.Second * 5)
			} else {
				retryChan <- true
				break
			}
		}
	}()
	select {
	case <-retryChan:
		cancel()
		close(retryChan)
		setupLog.Info("successfully set-up the local chartmuseum helm repository")
	case <-retryCtx.Done():
		cancel()
		close(retryChan)
		setupLog.Error(err, "pod timed out while trying to setup the helm chart museum...")
		os.Exit(1)
	}

	baseLogger := ctrl.Log.WithName("controllers").WithName("ApplicationGroup")

	if err = (&controllers.ApplicationGroupReconciler{
		Client:                  mgr.GetClient(),
		Log:                     baseLogger,
		Scheme:                  mgr.GetScheme(),
		RegistryClient:          rc,
		StagingRepoName:         "staging",
		WorkflowClientBuilder:   workflow.NewBuilder(mgr.GetClient(), baseLogger).WithStagingRepo(workflowHelmURL).WithParallelism(workflowParallelism).InNamespace(workflow.GetNamespace()),
		TargetDir:               tempChartStoreTargetDir,
		Recorder:                mgr.GetEventRecorderFor("appgroup-controller"),
		DisableRemediation:      disableRemediation,
		CleanupDownloadedCharts: cleanupDownloadedCharts,
	}).SetupWithManager(mgr); err != nil {
		setupLog.Error(err, "unable to create controller", "controller", "ApplicationGroup")
		os.Exit(1)
	}

	if err = (&controllers.WorkflowStatusReconciler{
		Client:                mgr.GetClient(),
		Log:                   baseLogger,
		Scheme:                mgr.GetScheme(),
		WorkflowClientBuilder: workflow.NewBuilder(mgr.GetClient(), baseLogger).WithStagingRepo(workflowHelmURL).WithParallelism(workflowParallelism).InNamespace(workflow.GetNamespace()),
		Recorder:              mgr.GetEventRecorderFor("appgroup-controller"),
	}).SetupWithManager(mgr); err != nil {
		setupLog.Error(err, "unable to create controller", "controller", "WorkflowStatus")
		os.Exit(1)
	}

	// +kubebuilder:scaffold:builder

	setupLog.Info("starting manager")
	if err := mgr.Start(ctrl.SetupSignalHandler()); err != nil {
		setupLog.Error(err, "problem running manager")
		os.Exit(1)
	}
}

// getValues returns the stagingRepoUrl unless the appGroup controller
// is run in a debug mode, then it returns the port forwarded url
func getValues(stagingHelmURL, tempChartStoreTargetDir string, debug bool) (string, string, string) {
	if debug {
		return "http://127.0.0.1:8080", "http://orkestra-chartmuseum.orkestra:8080", os.TempDir()
	}
	return stagingHelmURL, stagingHelmURL, tempChartStoreTargetDir
}