package pubsub

import (
	"context"
	"encoding/json"
	"oc-discovery/models"
	"strings"
	"sync"

	oclib "cloud.o-forge.io/core/oc-lib"
	"cloud.o-forge.io/core/oc-lib/dbs"
	"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/tools"
	pubsub "github.com/libp2p/go-libp2p-pubsub"
)

type PubSubService struct {
	PS           *pubsub.PubSub
	Subscription []string
	mutex        sync.RWMutex
}

var pubsubSingleton *PubSubService

func Init(ctx context.Context, ps *pubsub.PubSub) {
	pubsubSingleton = &PubSubService{
		PS:           ps,
		Subscription: []string{},
	}
	pubsubSingleton.initSubscribeEvents(ctx)
}

func GetPubSubService() *PubSubService {
	return pubsubSingleton
}

func (ps *PubSubService) getTopicName(topicName string) tools.PubSubAction {
	ns := strings.Split(topicName, ".")
	if len(ns) > 0 {
		return tools.GetActionString(ns[0])
	}
	return tools.NONE
}

func (abs *PubSubService) retrieveResponse(ctx context.Context, p *peer.Peer, event models.Event) error {
	res, err := resources.ToResource(int(event.DataType), event.Payload)
	if err != nil || res == nil {
		return nil
	}
	b, err := json.Marshal(res.Serialize(res))
	tools.NewNATSCaller().SetNATSPub(tools.CATALOG_SEARCH_EVENT, tools.NATSResponse{
		FromApp:  "oc-discovery",
		Datatype: tools.DataType(event.DataType),
		Method:   int(tools.CATALOG_SEARCH_EVENT),
		Payload:  b,
	})
	return nil
}

func (abs *PubSubService) sendResponse(ctx context.Context, p *peer.Peer, event models.Event) error {
	dts := []oclib.LibDataEnum{oclib.LibDataEnum(event.DataType)}
	if event.DataType == -1 { // expect all resources
		dts = []oclib.LibDataEnum{oclib.LibDataEnum(oclib.COMPUTE_RESOURCE), oclib.LibDataEnum(oclib.STORAGE_RESOURCE),
			oclib.LibDataEnum(oclib.PROCESSING_RESOURCE), oclib.LibDataEnum(oclib.DATA_RESOURCE), oclib.LibDataEnum(oclib.WORKFLOW_RESOURCE)}
	}
	var m map[string]string
	err := json.Unmarshal(event.Payload, &m)
	if err != nil {
		return err
	}
	for _, dt := range dts {
		access := oclib.NewRequestAdmin(oclib.LibDataEnum(event.DataType), nil)
		peerID := p.GetID()
		searched := access.Search(abs.filterPeer(peerID, m["search"]), "", false)
		for _, ss := range searched.Data {
			if j, err := json.Marshal(ss); err == nil {
				if event.DataType != -1 {
					ndt := tools.DataType(dt.EnumIndex())
					abs.publishEvent(ctx, &ndt, tools.PB_SEARCH_RESPONSE, event.User, peerID, j, true)
				} else {
					abs.publishEvent(ctx, nil, tools.PB_SEARCH_RESPONSE, event.User, peerID, j, true)
				}
			}
		}
	}
	return nil
}

func (abs *PubSubService) filterPeer(peerID string, search string) *dbs.Filters {
	id, err := oclib.GetMySelf()
	if err != nil {
		return nil
	}
	filter := map[string][]dbs.Filter{
		"creator_id": {{Operator: dbs.EQUAL.String(), Value: id}}, // is my resource...
		"": {{Operator: dbs.OR.String(), Value: &dbs.Filters{
			Or: map[string][]dbs.Filter{
				"abstractobject.access_mode": {{Operator: dbs.EQUAL.String(), Value: 1}}, // if public
				"abstractinstanciatedresource.instances": {{Operator: dbs.ELEMMATCH.String(), Value: &dbs.Filters{ // or got a partners instances
					And: map[string][]dbs.Filter{
						"resourceinstance.partnerships": {{Operator: dbs.ELEMMATCH.String(), Value: &dbs.Filters{
							And: map[string][]dbs.Filter{
								"resourcepartnership.peer_groups." + peerID: {{Operator: dbs.EXISTS.String(), Value: true}},
							},
						}}},
					},
				}}},
			},
		}}},
	}
	if search != "" {
		filter[" "] = []dbs.Filter{{Operator: dbs.OR.String(), Value: &dbs.Filters{
			Or: map[string][]dbs.Filter{ // filter by like name, short_description, description, owner, url if no filters are provided
				"abstractintanciatedresource.abstractresource.abstractobject.name":       {{Operator: dbs.LIKE.String(), Value: search}},
				"abstractintanciatedresource.abstractresource.type":                      {{Operator: dbs.LIKE.String(), Value: search}},
				"abstractintanciatedresource.abstractresource.short_description":         {{Operator: dbs.LIKE.String(), Value: search}},
				"abstractintanciatedresource.abstractresource.description":               {{Operator: dbs.LIKE.String(), Value: search}},
				"abstractintanciatedresource.abstractresource.owners.name":               {{Operator: dbs.LIKE.String(), Value: search}},
				"abstractintanciatedresource.abstractresource.abstractobject.creator_id": {{Operator: dbs.EQUAL.String(), Value: search}},
			},
		}}}
	}
	return &dbs.Filters{
		And: filter,
	}
}