package graph

import (
	"time"

	"cloud.o-forge.io/core/oc-lib/models/common/pricing"
	"cloud.o-forge.io/core/oc-lib/models/resources"
	"cloud.o-forge.io/core/oc-lib/tools"
)

// Graph is a struct that represents a graph
type Graph struct {
	Zoom  float64              `bson:"zoom" json:"zoom" default:"1"`                        // Zoom is the graphical zoom of the graph
	Items map[string]GraphItem `bson:"items" json:"items" default:"{}" validate:"required"` // Items is the list of elements in the graph
	Links []GraphLink          `bson:"links" json:"links" default:"{}" validate:"required"` // Links is the list of links between elements in the graph
}

func (g *Graph) GetAverageTimeRelatedToProcessingActivity(start time.Time, processings []*resources.CustomizedProcessingResource, resource resources.ShallowResourceInterface, f func(GraphItem) resources.ShallowResourceInterface) (float64, float64) {
	nearestStart := float64(10000000000)
	oneIsInfinite := false
	longestDuration := float64(0)
	for _, link := range g.Links {
		for _, processing := range processings {
			var source string                                                                                                                             // source is the source of the link
			if link.Destination.ID == processing.GetID() && f(g.Items[link.Source.ID]) != nil && f(g.Items[link.Source.ID]).GetID() == resource.GetID() { // if the destination is the processing and the source is not a compute
				source = link.Source.ID
			} else if link.Source.ID == processing.GetID() && f(g.Items[link.Source.ID]) != nil && f(g.Items[link.Source.ID]).GetID() == resource.GetID() { // if the source is the processing and the destination is not a compute
				source = link.Destination.ID
			}
			if source != "" {
				if processing.UsageStart != nil {
					near := float64(processing.UsageStart.Sub(start).Seconds())
					if near < nearestStart {
						nearestStart = near
					}

				}
				if processing.UsageEnd != nil {
					duration := float64(processing.UsageEnd.Sub(*processing.UsageStart).Seconds())
					if longestDuration < duration {
						longestDuration = duration
					}
				} else {
					oneIsInfinite = true
				}
			}
		}
	}
	if oneIsInfinite {
		return nearestStart, -1
	}
	return nearestStart, longestDuration
}

func (g *Graph) SetItemStartUsage(graphItemID string, start time.Time) {
	g.Items[graphItemID].SetItemStartUsage(start)
}

func (g *Graph) SetItemEndUsage(graphItemID string, end time.Time) {
	g.Items[graphItemID].SetItemEndUsage(end)
}

/*
* GetAverageTimeBeforeStart is a function that returns the average time before the start of a processing
 */
func (g *Graph) GetAverageTimeProcessingBeforeStart(average float64, processingID string) float64 {
	currents := []float64{}        // list of current time
	for _, link := range g.Links { // for each link
		var source string                                                                     // source is the source of the link
		if link.Destination.ID == processingID && g.Items[link.Source.ID].Processing == nil { // if the destination is the processing and the source is not a compute
			source = link.Source.ID
		} else if link.Source.ID == processingID && g.Items[link.Source.ID].Processing == nil { // if the source is the processing and the destination is not a compute
			source = link.Destination.ID
		}
		if source == "" { // if source is empty, continue
			continue
		}
		_, item := g.GetResource(source)         // get the resource of the source
		current := item.GetExplicitDurationInS() // get the explicit duration of the item
		if current < 0 {                         // if current is negative, its means that duration of a before could be infinite continue
			return current
		}
		current += g.GetAverageTimeProcessingBeforeStart(current, source) // get the average time before start of the source
		currents = append(currents, current)                              // append the current to the currents
	}
	var max float64 // get the max time to wait dependancies to finish
	for _, current := range currents {
		if current > max {
			max = current
		}
	}
	return max
}

func (g *Graph) GetResource(id string) (string, resources.ShallowResourceInterface) {
	if item, ok := g.Items[id]; ok {
		if item.Data != nil {
			return tools.DATA_RESOURCE.String(), item.Data
		} else if item.Compute != nil {
			return tools.COMPUTE_RESOURCE.String(), item.Compute
		} else if item.Workflow != nil {
			return tools.WORKFLOW_RESOURCE.String(), item.Workflow
		} else if item.Processing != nil {
			return tools.PROCESSING_RESOURCE.String(), item.Processing
		} else if item.Storage != nil {
			return tools.STORAGE_RESOURCE.String(), item.Storage
		}
	}
	return "", nil
}

// GraphItem is a struct that represents an item in a graph
type GraphItem struct {
	ID                               string   `bson:"id" json:"id" validate:"required"`             // ID is the unique identifier of the item
	Width                            float64  `bson:"width" json:"width" validate:"required"`       // Width is the graphical width of the item
	Height                           float64  `bson:"height" json:"height" validate:"required"`     // Height is the graphical height of the item
	Position                         Position `bson:"position" json:"position" validate:"required"` // Position is the graphical position of the item
	*resources.ItemExploitedResource          // ItemResource is the resource of the item affected to the item
}

func (g *GraphItem) GetResource() resources.ShallowResourceInterface {
	if g.Data != nil {
		return g.Data
	} else if g.Compute != nil {
		return g.Compute
	} else if g.Workflow != nil {
		return g.Workflow
	} else if g.Processing != nil {
		return g.Processing
	} else if g.Storage != nil {
		return g.Storage
	}
	return nil
}

func (g *GraphItem) GetPricedItem() pricing.PricedItemITF {
	if g.Data != nil {
		return g.Data
	} else if g.Compute != nil {
		return g.Compute
	} else if g.Workflow != nil {
		return g.Workflow
	} else if g.Processing != nil {
		return g.Processing
	} else if g.Storage != nil {
		return g.Storage
	}
	return nil
}

// GraphLink is a struct that represents a link between two items in a graph
type GraphLink struct {
	Source      Position        `bson:"source" json:"source" validate:"required"`           // Source is the source graphical position of the link
	Destination Position        `bson:"destination" json:"destination" validate:"required"` // Destination is the destination graphical position of the link
	Style       *GraphLinkStyle `bson:"style,omitempty" json:"style,omitempty"`             // Style is the graphical style of the link
}

// tool function to check if a link is a link between a compute and a resource
func (l *GraphLink) IsComputeLink(g Graph) (bool, string) {
	if g.Items == nil {
		return false, ""
	}
	if d, ok := g.Items[l.Source.ID]; ok && d.Compute != nil {
		return true, d.Compute.UUID
	}
	if d, ok := g.Items[l.Destination.ID]; ok && d.Compute != nil {
		return true, d.Compute.UUID
	}
	return false, ""
}

// GraphLinkStyle is a struct that represents the style of a link in a graph
type GraphLinkStyle struct {
	Color           int64    `bson:"color" json:"color"`                         // Color is the graphical color of the link (int description of a color, can be transpose as hex)
	Stroke          float64  `bson:"stroke" json:"stroke"`                       // Stroke is the graphical stroke of the link
	Tension         float64  `bson:"tension" json:"tension"`                     // Tension is the graphical tension of the link
	HeadRadius      float64  `bson:"head_radius" json:"head_radius"`             // graphical pin radius
	DashWidth       float64  `bson:"dash_width" json:"dash_width"`               // DashWidth is the graphical dash width of the link
	DashSpace       float64  `bson:"dash_space" json:"dash_space"`               // DashSpace is the graphical dash space of the link
	EndArrow        Position `bson:"end_arrow" json:"end_arrow"`                 // EndArrow is the graphical end arrow of the link
	StartArrow      Position `bson:"start_arrow" json:"start_arrow"`             // StartArrow is the graphical start arrow of the link
	ArrowStyle      int64    `bson:"arrow_style" json:"arrow_style"`             // ArrowStyle is the graphical arrow style of the link (enum foundable in UI)
	ArrowDirection  int64    `bson:"arrow_direction" json:"arrow_direction"`     // ArrowDirection is the graphical arrow direction of the link (enum foundable in UI)
	StartArrowWidth float64  `bson:"start_arrow_width" json:"start_arrow_width"` // StartArrowWidth is the graphical start arrow width of the link
	EndArrowWidth   float64  `bson:"end_arrow_width" json:"end_arrow_width"`     // EndArrowWidth is the graphical end arrow width of the link
}

// Position is a struct that represents a graphical position
type Position struct {
	ID string  `json:"id" bson:"id"`                   // ID reprents ItemID (optionnal)
	X  float64 `json:"x" bson:"x" validate:"required"` // X is the graphical x position
	Y  float64 `json:"y" bson:"y" validate:"required"` // Y is the graphical y position
}