package resources

import (
	"fmt"
	"net/url"
	"path"

	"github.com/dgraph-io/badger/v3"
	"github.com/go-fed/activity/streams"
)

func RenderOutboxPage(name, domain string, db *badger.DB) (map[string]interface{}, error) {
	id, err := url.Parse(path.Join("https://", domain, "actors", name, "outbox") + "?page=true")
	if err != nil {
		return nil, fmt.Errorf("could not partse url: %w", err)
	}

	partOf, err := url.Parse(path.Join("https://", domain, "actors", name, "outbox"))
	if err != nil {
		return nil, fmt.Errorf("could not partse url: %w", err)
	}

	oc := streams.NewActivityStreamsOrderedCollectionPage()

	idProp := streams.NewJSONLDIdProperty()
	idProp.Set(id)
	oc.SetJSONLDId(idProp)

	partOfProp := streams.NewActivityStreamsPartOfProperty()
	partOfProp.SetIRI(partOf)
	oc.SetActivityStreamsPartOf(partOfProp)

	itemsProp := streams.NewActivityStreamsOrderedItemsProperty()

	err = db.View(func(txn *badger.Txn) error {
		opts := badger.DefaultIteratorOptions
		opts.PrefetchValues = false
		it := txn.NewIterator(opts)
		defer it.Close()
		prefix := []byte("outbox:sample") // TODO
		for it.Seek(prefix); it.ValidForPrefix(prefix); it.Next() {
			item := it.Item()
			err := item.Value(func(v []byte) error {
				crea := streams.NewActivityStreamsCreate()
				obj := streams.NewActivityStreamsObjectProperty()
				crea.SetActivityStreamsObject(obj)

				note := streams.NewActivityStreamsNote()
				contentProp := streams.NewActivityStreamsContentProperty()
				contentProp.AppendXMLSchemaString(string(v))
				note.SetActivityStreamsContent(contentProp)
				obj.AppendActivityStreamsNote(note)

				itemsProp.AppendActivityStreamsCreate(crea)
				return nil
			})
			if err != nil {
				return err
			}
		}
		return nil
	})
	if err != nil {
		return nil, err
	}

	oc.SetActivityStreamsOrderedItems(itemsProp)
	return streams.Serialize(oc)
}

func RenderOutbox(name, domain string, db *badger.DB) (map[string]interface{}, error) {
	id, err := url.Parse(path.Join("https://", domain, "actors", name, "outbox") + "?page=true")

	if err != nil {
		return nil, fmt.Errorf("could not partse url: %w", err)
	}

	first, err := url.Parse(path.Join("https://", domain, "actors", name, "outbox") + "?page=true")
	if err != nil {
		return nil, fmt.Errorf("could not partse url: %w", err)
	}

	oc := streams.NewActivityStreamsOrderedCollection()

	idProp := streams.NewJSONLDIdProperty()
	idProp.Set(id)
	oc.SetJSONLDId(idProp)

	var i int
	err = db.View(func(txn *badger.Txn) error {
		opts := badger.DefaultIteratorOptions
		opts.PrefetchValues = false
		it := txn.NewIterator(opts)
		defer it.Close()
		prefix := []byte("outbox:sample") // TODO
		for it.Seek(prefix); it.ValidForPrefix(prefix); it.Next() {
			i++
		}
		return nil
	})
	if err != nil {
		return nil, err
	}

	itemsProp := streams.NewActivityStreamsTotalItemsProperty()
	itemsProp.Set(i)
	oc.SetActivityStreamsTotalItems(itemsProp)

	ocProp := streams.NewActivityStreamsFirstProperty()
	ocProp.SetIRI(first)
	oc.SetActivityStreamsFirst(ocProp)

	return streams.Serialize(oc)
}