// A class that translates the informations held in the graph object
// via its lists of components into an argo file, using the a list of
// link ID to build the dag

package workflow_builder

import (
	"errors"
	"fmt"
	"oc-monitord/conf"
	"oc-monitord/models"
	. "oc-monitord/models"
	"os"
	"time"

	oclib "cloud.o-forge.io/core/oc-lib"
	"cloud.o-forge.io/core/oc-lib/logs"
	"cloud.o-forge.io/core/oc-lib/models/resources"
	w "cloud.o-forge.io/core/oc-lib/models/workflow"
	"github.com/nwtgck/go-fakelish"
	"github.com/rs/zerolog"
	"gopkg.in/yaml.v3"
)

var logger zerolog.Logger

type ArgoBuilder struct {
	OriginWorkflow *w.Workflow
	Workflow       *models.Workflow
	Services       []*Service
	Timeout        int
	RemotePeers    []string
}

// TODO: found on a processing instance linked to storage
// add s3, gcs, azure, etc if needed on a link between processing and storage
func (b *ArgoBuilder) CreateDAG(namespace string, write bool) (int, []string, []string, error) {
	logger = logs.GetLogger()
	logger.Info().Msg(fmt.Sprint("Creating DAG ", b.OriginWorkflow.Graph.Items))
	// handle services by checking if there is only one processing with hostname and port
	firstItems, lastItems, volumes := b.createTemplates(namespace)
	b.createVolumes(volumes)
	if b.Timeout > 0 {
		b.Workflow.Spec.Timeout = b.Timeout
	}
	b.Workflow.Spec.ServiceAccountName = "sa-" + namespace
	b.Workflow.Spec.Entrypoint = "dag"
	b.Workflow.ApiVersion = "argoproj.io/v1alpha1"
	b.Workflow.Kind = "Workflow"
	return len(b.Workflow.GetDag().Tasks), firstItems, lastItems, nil
}

func (b *ArgoBuilder) createTemplates(namespace string) ([]string, []string, []models.VolumeMount) {
	volumes := []models.VolumeMount{}
	firstItems := []string{}
	lastItems := []string{}
	items := b.OriginWorkflow.GetGraphItems(b.OriginWorkflow.Graph.IsProcessing)
	logger.Info().Msg(fmt.Sprint("Creating templates", len(items)))
	for _, item := range items {
		instance := item.Processing.GetSelectedInstance()
		logger.Info().Msg(fmt.Sprint("Creating template for", item.Processing.GetName(), instance))
		if instance == nil || instance.(*resources.ProcessingInstance).Access == nil && instance.(*resources.ProcessingInstance).Access.Container != nil {
			logger.Error().Msg("Not enough configuration setup, template can't be created : " + item.Processing.GetName())
			return firstItems, lastItems, volumes
		}
		volumes, firstItems, lastItems = b.createArgoTemplates(namespace,
			item.ID, item.Processing, volumes, firstItems, lastItems)
	}

	wfDeps := models.NewWorkflowDependancies()
	for _, workflowID := range b.OriginWorkflow.Workflows {
		b.createWorkflowArgoTemplate(workflowID, namespace, wfDeps)
	}
	wfDeps.BindRelatedTasks(b.Workflow.GetDag())
	wfDeps.BindFirstTasks(b.OriginWorkflow.GetDependencies, b.Workflow.GetDag())

	if b.Services != nil {
		dag := b.Workflow.GetDag()
		dag.Tasks = append(dag.Tasks, Task{Name: "workflow-service-pod", Template: "workflow-service-pod"})
		b.addServiceToArgo()
	}
	return firstItems, lastItems, volumes
}

func (b *ArgoBuilder) createWorkflowArgoTemplate(
	workflowID string,
	namespace string,
	wfDeps *models.WorkflowsDependancies,
) {
	realWorkflow, code, err := w.NewAccessor(nil).LoadOne(workflowID)
	if code != 200 {
		logger.Error().Msg("Error loading the workflow : " + err.Error())
		return
	}
	subBuilder := ArgoBuilder{OriginWorkflow: realWorkflow.(*w.Workflow), Workflow: &models.Workflow{}, Timeout: b.Timeout}
	_, fi, li, err := subBuilder.CreateDAG(namespace, false)
	if err != nil {
		logger.Error().Msg("Error creating the subworkflow : " + err.Error())
		return
	}
	wfDeps.FirstWfTasks[workflowID] = fi
	if depsOfIds := subBuilder.OriginWorkflow.IsDependancy(workflowID); len(depsOfIds) > 0 { // IS BEFORE
		wfDeps.LastWfTasks[workflowID] = li
		wfDeps.RelatedWfTasks[workflowID] = models.TransformDepsToArgo(depsOfIds)
	}
	subDag := subBuilder.Workflow.GetDag()
	d := b.Workflow.GetDag()
	d.Tasks = append(d.Tasks, subDag.Tasks...) // add the tasks of the subworkflow to the main workflow
	b.Workflow.Spec.Templates = append(b.Workflow.Spec.Templates, subBuilder.Workflow.Spec.Templates...)
	b.Workflow.Spec.Volumes = append(b.Workflow.Spec.Volumes, subBuilder.Workflow.Spec.Volumes...)
	b.Workflow.Spec.Arguments = append(b.Workflow.Spec.Arguments, subBuilder.Workflow.Spec.Arguments...)
	b.Services = append(b.Services, subBuilder.Services...)
}

func (b *ArgoBuilder) createArgoTemplates(
	namespace string,
	id string,
	processing *resources.ProcessingResource,
	volumes []models.VolumeMount,
	firstItems []string,
	lastItems []string,
) ([]models.VolumeMount, []string, []string) {
	_, firstItems, lastItems = NewTask(processing.Name, id).BindToArgo(b.Workflow.GetDag(), id, b.OriginWorkflow, processing, firstItems, lastItems)
	template := &Template{Name: models.GetArgoName(processing.GetName(), id)}
	logger.Info().Msg(fmt.Sprint("Creating template for", template.Name))

	template.CreateContainer(processing, b.Workflow.GetDag())
	if err := b.RepartiteProcess(*processing, id, template, namespace); err != nil {
		logger.Error().Msg(fmt.Sprint("Problem to sets up repartition expected %v", err.Error()))
		return volumes, firstItems, lastItems
	}
	// get datacenter from the processing
	if processing.IsService {
		b.CreateService(id, processing)
		template.Metadata.Labels = make(map[string]string)
		template.Metadata.Labels["app"] = "oc-service-" + processing.GetName() // Construct the template for the k8s service and add a link in graph between k8s service and processing
	}
	b.Workflow.Spec.Templates = append(b.Workflow.Spec.Templates, *template)
	return volumes, firstItems, lastItems
}

func (b *ArgoBuilder) createVolumes(volumes []models.VolumeMount) { // TODO : one think about remote volume but TG
	for _, volume := range volumes {
		volume.BindToArgo(b.Workflow)
	}
}

// Verify if a processing resource is attached to another Compute than the one hosting
// the current Open Cloud instance. If true return the peer ID to contact
func (b *ArgoBuilder) RepartiteProcess(processing resources.ProcessingResource, graphID string, template *models.Template, namespace string) error {
	computeAttached := b.OriginWorkflow.GetByRelatedProcessing(processing.GetID(), b.OriginWorkflow.Graph.IsCompute)
	if len(computeAttached) == 0 {
		return errors.New("No compute was found attached to processing " + processing.Name + " : " + processing.UUID)
	}
	// Creates an accessor srtictly for Peer Collection
	for _, related := range computeAttached {
		res := oclib.NewRequest(oclib.LibDataEnum(oclib.PEER), "", "", nil, nil).LoadOne(related.Node.GetCreatorID())
		if res.Err != "" {
			return errors.New(res.Err)
		}

		peer := *res.ToPeer()

		isNotReparted := peer.State == 1
		logger.Info().Msg(fmt.Sprint("Result IsMySelf for ", peer.UUID, " : ", isNotReparted))
		if !(isNotReparted) {
			logger.Debug().Msg("Reparted processing, on " + peer.UUID)
			b.RemotePeers = append(b.RemotePeers, peer.UUID)
			template.AddAdmiraltyAnnotations(peer.UUID, namespace)
		}
	}
	return nil
}

// Execute the last actions once the YAML file for the Argo Workflow is created
func (b *ArgoBuilder) CompleteBuild(namespace string) (string, error) {
	logger.Info().Msg("DEV :: Completing build")
	setter := AdmiraltySetter{Id: namespace}
	// Setup admiralty for each node
	for _, peer := range b.RemotePeers {
		logger.Info().Msg(fmt.Sprint("DEV :: Launching Admiralty Setup for ", peer))
		setter.InitializeAdmiralty(conf.GetConfig().PeerID, peer)
	}
	// Generate the YAML file
	random_name := fakelish.GenerateFakeWord(5, 8) + "-" + fakelish.GenerateFakeWord(5, 8)
	b.Workflow.Metadata.Name = "oc-monitor-" + random_name
	logger = oclib.GetLogger()
	yamlified, err := yaml.Marshal(b.Workflow)
	if err != nil {
		logger.Error().Msg("Could not transform object to yaml file")
		return "", err
	}
	// Give a unique name to each argo file with its timestamp DD:MM:YYYY_hhmmss
	current_timestamp := time.Now().Format("02_01_2006_150405")
	file_name := random_name + "_" + current_timestamp + ".yml"
	workflows_dir := "./argo_workflows/"
	err = os.WriteFile(workflows_dir+file_name, []byte(yamlified), 0660)

	if err != nil {
		logger.Error().Msg("Could not write the yaml file")
		return "", err
	}

	return workflows_dir + file_name, nil
}