package workflow

import (
	"errors"
	"time"

	"cloud.o-forge.io/core/oc-lib/models/collaborative_area/shallow_collaborative_area"
	"cloud.o-forge.io/core/oc-lib/models/common"
	"cloud.o-forge.io/core/oc-lib/models/common/pricing"
	"cloud.o-forge.io/core/oc-lib/models/peer"
	"cloud.o-forge.io/core/oc-lib/models/resources"
	"cloud.o-forge.io/core/oc-lib/models/utils"
	"cloud.o-forge.io/core/oc-lib/models/workflow/graph"
	"cloud.o-forge.io/core/oc-lib/tools"
)

/*
* Workflow is a struct that represents a workflow
* it defines the native workflow
 */
type Workflow struct {
	utils.AbstractObject // AbstractObject contains the basic fields of an object (id, name)
	resources.ResourceSet
	Graph          *graph.Graph `bson:"graph,omitempty" json:"graph,omitempty"` // Graph UI & logic representation of the workflow
	ScheduleActive bool         `json:"schedule_active" bson:"schedule_active"` // ScheduleActive is a flag that indicates if the schedule is active, if not the workflow is not scheduled and no execution or booking will be set
	// Schedule       *WorkflowSchedule `bson:"schedule,omitempty" json:"schedule,omitempty"` // Schedule is the schedule of the workflow
	Shared []string `json:"shared,omitempty" bson:"shared,omitempty"` // Shared is the ID of the shared workflow     // AbstractWorkflow contains the basic fields of a workflow
}

func (d *Workflow) GetAccessor(request *tools.APIRequest) utils.Accessor {
	return NewAccessor(request) // Create a new instance of the accessor
}

func (w *Workflow) GetGraphItems(f func(item graph.GraphItem) bool) (list_datas []graph.GraphItem) {
	for _, item := range w.Graph.Items {
		if f(item) {
			list_datas = append(list_datas, item)
		}
	}
	return
}

func (w *Workflow) GetPricedItem(f func(item graph.GraphItem) bool, request *tools.APIRequest) map[string]pricing.PricedItemITF {
	list_datas := map[string]pricing.PricedItemITF{}
	for _, item := range w.Graph.Items {
		if f(item) {
			dt, res := item.GetResource()
			ord := res.ConvertToPricedResource(dt, request)
			list_datas[res.GetID()] = ord
		}
	}
	return list_datas
}

func (w *Workflow) GetByRelatedProcessing(processingID string, g func(item graph.GraphItem) bool) []resources.ResourceInterface {
	storages := []resources.ResourceInterface{}
	for _, link := range w.Graph.Links {
		nodeID := link.Destination.ID
		var node resources.ResourceInterface
		if g(w.Graph.Items[link.Source.ID]) {
			item := w.Graph.Items[link.Source.ID]
			_, node = item.GetResource()
		}
		if node == nil && g(w.Graph.Items[link.Destination.ID]) { // if the source is not a storage, we consider that the destination is the storage
			nodeID = link.Source.ID
			item := w.Graph.Items[link.Destination.ID] // and the processing is the source
			_, node = item.GetResource()               // we are looking for the storage as destination
		}
		if processingID == nodeID && node != nil { // if the storage is linked to the processing
			storages = append(storages, node)
		}
	}
	return storages
}

func (ao *Workflow) VerifyAuth(request *tools.APIRequest) bool {
	isAuthorized := false
	if len(ao.Shared) > 0 {
		for _, shared := range ao.Shared {
			shared, code, _ := shallow_collaborative_area.NewAccessor(request).LoadOne(shared)
			if code != 200 || shared == nil {
				isAuthorized = false
			}
			isAuthorized = shared.VerifyAuth(request)
		}
	}
	return ao.AbstractObject.VerifyAuth(request) || isAuthorized
}

/*
* CheckBooking is a function that checks the booking of the workflow on peers (even ourselves)
 */
func (wfa *Workflow) CheckBooking(caller *tools.HTTPCaller) (bool, error) {
	// check if
	if wfa.Graph == nil { // no graph no booking
		return false, nil
	}
	accessor := (&resources.ComputeResource{}).GetAccessor(&tools.APIRequest{Caller: caller})
	for _, link := range wfa.Graph.Links {
		if ok, compute_id := link.IsComputeLink(*wfa.Graph); ok { // check if the link is a link between a compute and a resource
			compute, code, _ := accessor.LoadOne(compute_id)
			if code != 200 {
				continue
			}
			// CHECK BOOKING ON PEER, compute could be a remote one
			peerID := compute.(*resources.ComputeResource).CreatorID
			if peerID == "" {
				return false, errors.New("no peer id")
			} // no peer id no booking, we need to know where to book
			_, err := (&peer.Peer{}).LaunchPeerExecution(peerID, compute_id, tools.BOOKING, tools.GET, nil, caller)
			if err != nil {
				return false, err
			}
		}
	}
	return true, nil
}

func (wf *Workflow) Planify(start time.Time, end *time.Time, request *tools.APIRequest) (float64, map[tools.DataType][]pricing.PricedItemITF, *Workflow, error) {
	priceds := map[tools.DataType][]pricing.PricedItemITF{}
	ps, priceds, err := plan[*resources.ProcessingResource](tools.PROCESSING_RESOURCE, wf, priceds, request, wf.Graph.IsProcessing,
		func(res resources.ResourceInterface, priced pricing.PricedItemITF) (time.Time, float64) {
			return start.Add(time.Duration(wf.Graph.GetAverageTimeProcessingBeforeStart(0, res.GetID(), request)) * time.Second), priced.GetExplicitDurationInS()
		}, func(started time.Time, duration float64) time.Time {
			return started.Add(time.Duration(duration))
		})
	if err != nil {
		return 0, priceds, nil, err
	}
	if _, priceds, err = plan[resources.ResourceInterface](tools.DATA_RESOURCE, wf, priceds, request, wf.Graph.IsData,
		func(res resources.ResourceInterface, priced pricing.PricedItemITF) (time.Time, float64) {
			return start, 0
		}, func(started time.Time, duration float64) time.Time {
			return *end
		}); err != nil {
		return 0, priceds, nil, err
	}
	for k, f := range map[tools.DataType]func(graph.GraphItem) bool{tools.STORAGE_RESOURCE: wf.Graph.IsStorage, tools.COMPUTE_RESOURCE: wf.Graph.IsCompute} {
		if _, priceds, err = plan[resources.ResourceInterface](k, wf, priceds, request, f,
			func(res resources.ResourceInterface, priced pricing.PricedItemITF) (time.Time, float64) {
				nearestStart, longestDuration := wf.Graph.GetAverageTimeRelatedToProcessingActivity(start, ps, res, func(i graph.GraphItem) (r resources.ResourceInterface) {
					if f(i) {
						_, r = i.GetResource()
					}
					return r
				}, request)
				return start.Add(time.Duration(nearestStart) * time.Second), longestDuration
			}, func(started time.Time, duration float64) time.Time {
				return started.Add(time.Duration(duration))
			}); err != nil {
			return 0, priceds, nil, err
		}
	}
	longest := common.GetPlannerLongestTime(end, priceds, request)
	if _, priceds, err = plan[resources.ResourceInterface](tools.WORKFLOW_RESOURCE, wf, priceds, request, wf.Graph.IsWorkflow,
		func(res resources.ResourceInterface, priced pricing.PricedItemITF) (time.Time, float64) {
			start := start.Add(time.Duration(common.GetPlannerNearestStart(start, priceds, request)) * time.Second)
			longest := float64(-1)
			r, code, err := res.GetAccessor(request).LoadOne(res.GetID())
			if code != 200 || err != nil {
				return start, longest
			}
			if neoLongest, _, _, err := r.(*Workflow).Planify(start, end, request); err != nil {
				return start, longest
			} else if neoLongest > longest {
				longest = neoLongest
			}
			return start.Add(time.Duration(common.GetPlannerNearestStart(start, priceds, request)) * time.Second), longest
		}, func(start time.Time, longest float64) time.Time {
			return start.Add(time.Duration(longest) * time.Second)
		}); err != nil {
		return 0, priceds, nil, err
	}
	return longest, priceds, wf, nil
}

func plan[T resources.ResourceInterface](dt tools.DataType, wf *Workflow, priceds map[tools.DataType][]pricing.PricedItemITF, request *tools.APIRequest,
	f func(graph.GraphItem) bool, start func(resources.ResourceInterface, pricing.PricedItemITF) (time.Time, float64), end func(time.Time, float64) time.Time) ([]T, map[tools.DataType][]pricing.PricedItemITF, error) {
	resources := []T{}
	for _, item := range wf.GetGraphItems(f) {
		if priceds[dt] == nil {
			priceds[dt] = []pricing.PricedItemITF{}
		}
		dt, realItem := item.GetResource()
		if realItem == nil {
			return resources, priceds, errors.New("could not load the processing resource")
		}
		priced := realItem.ConvertToPricedResource(dt, request)
		started, duration := start(realItem, priced)
		priced.SetLocationStart(started)
		if duration >= 0 {
			priced.SetLocationEnd(end(started, duration))
		}
		priced.SetLocationEnd(end(started, priced.GetExplicitDurationInS()))
		resources = append(resources, realItem.(T))
		priceds[dt] = append(priceds[dt], priced)
	}
	return resources, priceds, nil
}