package bill

import (
	"sync"
	"time"

	"cloud.o-forge.io/core/oc-lib/dbs"
	"cloud.o-forge.io/core/oc-lib/models/common/enum"
	"cloud.o-forge.io/core/oc-lib/models/common/pricing"
	"cloud.o-forge.io/core/oc-lib/models/order"
	"cloud.o-forge.io/core/oc-lib/models/peer"
	"cloud.o-forge.io/core/oc-lib/models/resources/purchase_resource"
	"cloud.o-forge.io/core/oc-lib/models/utils"
	"cloud.o-forge.io/core/oc-lib/tools"
)

/*
* Booking is a struct that represents a booking
 */

type Bill struct {
	utils.AbstractObject
	OrderID   string                `json:"order_id" bson:"order_id" validate:"required"`
	Status    enum.CompletionStatus `json:"status" bson:"status" default:"0"`
	SubOrders map[string]*PeerOrder `json:"sub_orders" bson:"sub_orders"`
	Total     float64               `json:"total" bson:"total" validate:"required"`
}

func DraftBill(order *order.Order, request *tools.APIRequest) (*Bill, error) {
	peers := map[string][]*PeerItemOrder{}
	for _, p := range order.Purchases {
		// TODO : if once
		if _, ok := peers[p.DestPeerID]; !ok {
			peers[p.DestPeerID] = []*PeerItemOrder{}
		}
		peers[p.DestPeerID] = append(peers[p.DestPeerID], &PeerItemOrder{
			Purchase: p,
			Item:     p.PricedItem,
			Quantity: 1,
		})
	}
	for _, b := range order.Bookings {
		// TODO : if once
		isPurchased := false
		for _, p := range order.Purchases {
			if p.ResourceID == b.ResourceID {
				isPurchased = true
				break
			}
		}
		if isPurchased {
			continue
		}
		if _, ok := peers[b.DestPeerID]; !ok {
			peers[b.DestPeerID] = []*PeerItemOrder{}
		}
		peers[b.DestPeerID] = append(peers[b.DestPeerID], &PeerItemOrder{
			Item: b.PricedItem,
		})
	}
	peerOrders := map[string]*PeerOrder{}
	for peerID, items := range peers {
		pr, _, err := peer.NewAccessor(request).LoadOne(peerID)
		if err != nil {
			return nil, err
		}
		peerOrders[peerID] = &PeerOrder{
			PeerID:         peerID,
			BillingAddress: pr.(*peer.Peer).WalletAddress,
			Items:          items,
		}
	}
	bill := &Bill{
		AbstractObject: utils.AbstractObject{
			Name:    "bill_" + request.PeerID + "_" + time.Now().UTC().Format("2006-01-02T15:04:05"),
			IsDraft: true,
		},
		OrderID:   order.UUID,
		Status:    enum.PENDING,
		SubOrders: peerOrders,
	}
	return bill.SumUpBill(request)
}

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

func (r *Bill) StoreDraftDefault() {
	r.IsDraft = true
}

func (r *Bill) CanUpdate(set utils.DBObject) (bool, utils.DBObject) {
	if !r.IsDraft && r.Status != set.(*Bill).Status {
		return true, &Bill{Status: set.(*Bill).Status} // only state can be updated
	}
	return r.IsDraft, set
}

func (r *Bill) CanDelete() bool {
	return r.IsDraft // only draft order can be deleted
}

func (d *Bill) SumUpBill(request *tools.APIRequest) (*Bill, error) {
	for _, b := range d.SubOrders {
		err := b.SumUpBill(request)
		if err != nil {
			return d, err
		}
		d.Total += b.Total
	}
	return d, nil
}

type PeerOrder struct {
	Error          string                `json:"error,omitempty" bson:"error,omitempty"`
	PeerID         string                `json:"peer_id,omitempty" bson:"peer_id,omitempty"`
	Status         enum.CompletionStatus `json:"status" bson:"status" default:"0"`
	BillingAddress string                `json:"billing_address,omitempty" bson:"billing_address,omitempty"`
	Items          []*PeerItemOrder      `json:"items,omitempty" bson:"items,omitempty"`
	Total          float64               `json:"total,omitempty" bson:"total,omitempty"`
}

func (d *PeerOrder) Pay(request *tools.APIRequest, response chan *PeerOrder, wg *sync.WaitGroup) {
	d.Status = enum.PENDING
	go func() {
		// DO SOMETHING TO PAY ON BLOCKCHAIN OR WHATEVER ON RETURN UPDATE STATUS
		d.Status = enum.PAID // TO REMOVE LATER IT'S A MOCK
		if d.Status == enum.PAID {
			for _, b := range d.Items {
				if !b.Item.IsPurchasable() {
					continue
				}
				accessor := purchase_resource.NewAccessor(request)
				accessor.StoreOne(&purchase_resource.PurchaseResource{
					ResourceID:   b.Item.GetID(),
					ResourceType: b.Item.GetType(),
					EndDate:      b.Item.GetLocationEnd(),
				})
			}
		}

		if d.Status != enum.PENDING {
			response <- d
		}
		wg.Done()
	}()
}

func (d *PeerOrder) SumUpBill(request *tools.APIRequest) error {
	for _, b := range d.Items {
		tot, err := b.GetPrice(request) // missing something
		if err != nil {
			return err
		}
		d.Total += tot
	}
	return nil
}

type PeerItemOrder struct {
	Quantity int                                 `json:"quantity,omitempty" bson:"quantity,omitempty"`
	Purchase *purchase_resource.PurchaseResource `json:"purchase,omitempty" bson:"purchase,omitempty"`
	Item     pricing.PricedItemITF               `json:"item,omitempty" bson:"item,omitempty"`
}

func (d *PeerItemOrder) GetPrice(request *tools.APIRequest) (float64, error) {
	accessor := purchase_resource.NewAccessor(request)
	search, code, _ := accessor.Search(&dbs.Filters{
		And: map[string][]dbs.Filter{
			"resource_id": {{Operator: dbs.EQUAL.String(), Value: d.Item.GetID()}},
		},
	}, "", d.Purchase.IsDraft)
	if code == 200 && len(search) > 0 {
		for _, s := range search {
			if s.(*purchase_resource.PurchaseResource).EndDate == nil || time.Now().UTC().After(*s.(*purchase_resource.PurchaseResource).EndDate) {
				return 0, nil
			}
		}
	}
	p, err := d.Item.GetPrice()
	if err != nil {
		return 0, err
	}
	return p * float64(d.Quantity), nil
}

// WTF HOW TO SELECT THE RIGHT PRICE ???
// SHOULD SET A BUYING STATUS WHEN PAYMENT IS VALIDATED