package models

import (
	"net"
	"time"

	"cloud.o-forge.io/core/oc-catalog/models/rtype"
	"cloud.o-forge.io/core/oc-catalog/services"
	"github.com/beego/beego/v2/core/logs"
	"go.mongodb.org/mongo-driver/bson/primitive"
)

type DatacenterCpuModel struct {
	Cores         uint   `json:"cores" required:"true"` //TODO: validate
	Architecture  string `json:"architecture"`          //TOOD: enum
	Shared        bool   `json:"shared"`
	MinimumMemory uint   `json:"minimum_memory"`
	Platform      string `json:"platform"`
}

type DatacenterMemoryModel struct {
	Size uint `json:"size" description:"Units in MB"`
	Ecc  bool `json:"ecc"`
}

type DatacenterGpuModel struct {
	CudaCores   uint   `json:"cuda_cores"`
	Model       string `json:"model"`
	Memory      uint   `json:"memory" description:"Units in MB"`
	TensorCores uint   `json:"tensor_cores"`
}

type DatacenterNEWModel struct {
	Name             string   `json:"name" required:"true"`
	Type             string   `json:"type,omitempty" required:"true"`
	Acronym          string   `json:"acronym" required:"true" description:"id of the DC"`
	Hosts            []string `json:"hosts" required:"true" description:"list of host:port"`
	Description      string   `json:"description" required:"true"`
	ShortDescription string   `json:"short_description" required:"true" validate:"required"`
	Logo             string   `json:"logo" required:"true" validate:"required"`

	CPU DatacenterCpuModel    `json:"cpu" required:"true"`
	RAM DatacenterMemoryModel `json:"ram" required:"true"`
	GPU []DatacenterGpuModel  `json:"gpu" required:"true"`

	Owner        string `json:"owner" `
	BookingPrice int    `json:"bookingPrice" `
}

type DatacenterModel struct {
	ID                 string `json:"ID" bson:"_id" required:"true"`
	DatacenterNEWModel `bson:",inline"`
}

func GetDatacenterFromAcronym(DC_name string) (retObj *DatacenterModel) {
	// TODO: This call should get the data from the peers, since it could be a different
	// host in the future
	res := services.MngoCollDatacenter.FindOne(services.MngoCtx, primitive.M{"acronym": DC_name})

	if res.Err() != nil {
		logs.Error(res)
		return
	}

	var ret DatacenterModel
	res.Decode(&ret)

	return &ret
}

func (obj DatacenterModel) GetTotalCPUs() uint {
	return obj.CPU.Cores
}

func (obj DatacenterModel) GetTotalGPUs() uint {
	return uint(len(obj.GPU))
}

func (obj DatacenterModel) GetTotalRAM() uint {
	return obj.RAM.Size
}

func (obj DatacenterModel) getRtype() rtype.Rtype {
	return rtype.DATACENTER
}

func (model DatacenterModel) getName() string {
	return model.Name
}

type DatacenterObject struct {
	ReferenceID primitive.ObjectID `json:"referenceID" description:"Data model ID"`
}

func (obj *DatacenterObject) setReference(rID primitive.ObjectID) {
	obj.ReferenceID = rID
}

func (obj DatacenterObject) getModel() (ret ResourceModel, err error) {
	var ret2 DatacenterModel
	res := services.MngoCollDatacenter.FindOne(services.MngoCtx,
		primitive.M{"_id": obj.ReferenceID},
	)

	if err = res.Err(); err != nil {
		return
	}

	err = res.Decode(&ret2)
	return ret2, err
}

func (obj DatacenterObject) getReference() primitive.ObjectID {
	return obj.ReferenceID
}

// Return a reachable host. If no one is reachable, return the first entry
func (obj DatacenterObject) getHost() (host *string) {
	res := services.MngoCollDatacenter.FindOne(services.MngoCtx, primitive.M{"_id": obj.ReferenceID})

	if res.Err() != nil {
		logs.Error(res)
		return nil
	}

	var ret DatacenterModel

	err := res.Decode(&ret)
	if err != nil {
		logs.Error(res)
		return nil
	}

	host = GetHost(ret.Hosts)
	return
}

func GetHost(hosts []string) (host *string) {
	// Return the first one if we can't reach any server
	host = &hosts[0]

	for _, singleHost := range hosts {
		conn, err := net.DialTimeout("tcp", singleHost, time.Duration(3)*time.Second) //FIXME: longer wait for connection in the future?

		if err != nil {
			continue
		}

		if conn != nil {
			//bingo
			host = &singleHost
			conn.Close()
			return
		}
	}
	return
}

func (obj DatacenterObject) getRtype() rtype.Rtype {
	return rtype.DATACENTER
}

func (obj DatacenterObject) getName() (name *string) {

	res := services.MngoCollDatacenter.FindOne(services.MngoCtx, primitive.M{"_id": obj.ReferenceID})

	if res.Err() != nil {
		logs.Error(res)
		return
	}

	var ret DatacenterModel
	res.Decode(&ret)

	return &ret.Name
}

func (obj DatacenterObject) isLinked(rID string) LinkingState {
	return NO_LINK
}

func (obj *DatacenterObject) addLink(direction LinkingState, rObjID string) {

}

func PostOneDatacenter(obj DatacenterNEWModel) (string, error) {
	return postOneResource(obj, rtype.DATACENTER)
}

func GetMultipleDatacenter(IDs []string) (object *[]DatacenterModel, err error) {
	objArray, err := getMultipleResourceByIDs(IDs, rtype.DATACENTER)

	if err != nil {
		return nil, err
	}

	object = objArray.(*[]DatacenterModel)

	return object, err
}

func GetOneDatacenter(ID string) (object *DatacenterModel, err error) {
	obj, err := getOneResourceByID(ID, rtype.DATACENTER)

	if err != nil {
		return object, err
	}

	object = obj.(*DatacenterModel) //TODO: fix a possible segfault in this model and the others

	return object, err
}