package models

import (
	"bytes"
	"encoding/json"
	"fmt"
	"time"

	"git.capotej.com/capotej/communique/config"
	"github.com/dgraph-io/badger/v3"
	"github.com/go-fed/activity/streams/vocab"
	"github.com/segmentio/ksuid"
)

// ActivityStreamsObject is our internal model for storing activity streams objects
// For every object we receive, we create 2+N copies of it in Badger:
//   - the original object
//   - a copy for dedupe with an optional TTL (specified by handler response) TODO
//   - a temporary copy for every subscriber until it is delivered TODO
type ActivityStreamsObject struct {
	wrappedObject vocab.ActivityStreamsNote // OPTIONAL, not always wrapped (think .count)
	handler       config.Handler
}

func NewActivityStreamsObject(obj vocab.ActivityStreamsNote, h config.Handler) *ActivityStreamsObject {
	aso := &ActivityStreamsObject{wrappedObject: obj, handler: h}
	return aso
}

func (a *ActivityStreamsObject) keyName() []byte {
	k, _ := ksuid.NewRandomWithTime(time.Now())
	key := fmt.Sprintf("%s:%s", a.Keybase(), k.String())
	return []byte(key)
}

func (a *ActivityStreamsObject) Keybase() string {
	keyBase := fmt.Sprintf("outboxes:%s", a.handler.Name)
	return keyBase
}

func (a *ActivityStreamsObject) content() []byte {
	objMap, _ := a.wrappedObject.Serialize()
	buffer := &bytes.Buffer{}
	encoder := json.NewEncoder(buffer)
	encoder.SetEscapeHTML(false)
	encoder.Encode(objMap)
	return bytes.TrimRight(buffer.Bytes(), "\n")
}

func (a *ActivityStreamsObject) Save(txn *badger.Txn) error {
	content := a.content()
	e := badger.NewEntry(a.keyName(), content)
	return txn.SetEntry(e)
}