package adapter

import (
	"fmt"
	. "forge.lightcrystal.systems/lightcrystal/underbbs/models"
	"github.com/yitsushi/go-misskey"
	mkcore "github.com/yitsushi/go-misskey/core"
	mkm "github.com/yitsushi/go-misskey/models"
	n "github.com/yitsushi/go-misskey/services/notes"
	tl "github.com/yitsushi/go-misskey/services/notes/timeline"
	_ "strings"
	"time"
)

type MisskeyAdapter struct {
	data     chan SocketData
	nickname string
	server   string
	apiKey   string

	mk *misskey.Client

	// unlike the mastodon client, we have to manage combining resources
	// from different API calls instead of streaming them in a single channel

	cache map[string]time.Time

	stop chan bool
}

func (self *MisskeyAdapter) Init(settings Settings, data chan SocketData) error {
	fmt.Println("initializing misskey adapter")

	self.nickname = settings.Nickname
	self.server = *settings.Server
	self.apiKey = *settings.ApiKey
	self.data = data

	fmt.Println("getting ready to initialize internal client")

	client, err := misskey.NewClientWithOptions(
		misskey.WithAPIToken(self.apiKey),
		misskey.WithBaseURL("https", self.server, ""),
	)

	if err != nil {
		fmt.Println(err.Error())
		return err
	}
	fmt.Println("misskey client initialized")
	self.mk = client

	self.cache = make(map[string]time.Time)

	return nil
}

func (self *MisskeyAdapter) Subscribe(filter string) []error {
	// misskey streaming API is undocumented....
	// we could try to reverse engineer it by directly connecting to the websocket???
	// alternatively, we can poll timelines, mentions, etc with a cancellation channel,
	// keep a cache of IDs in memory, and send new objects on the data channel

	// TODO: decode the filter so we can send data to the mk services

	// same as in masto, we will want to close and reopen the stop channel
	if self.stop != nil {
		close(self.stop)
	}
	self.stop = make(chan bool)

	// in the background, continuously read data from these API endpoints
	// if they are newer than the cache, convert them to UnderBBS objects
	// and send them on the data channel

	go self.poll()

	return nil
}

func (self *MisskeyAdapter) poll() {

	var latest *time.Time

	notesService := self.mk.Notes()
	timelineService := notesService.Timeline()

	for {
		select {
		case _, ok := <-self.stop:
			if !ok {
				return
			}
		default:

			// TODO: we have to actually decode and pass our filter criteria
			// probe for new notes

			probenote, err := timelineService.Get(tl.GetRequest{
				Limit: 1,
			})
			if err == nil && len(probenote) > 0 && self.isNew(probenote[0]) {
				if latest == nil {
					latest = &probenote[0].CreatedAt
					// this is the first fetch of notes, we can just grab them
					notes, err := timelineService.Get(tl.GetRequest{
						Limit: 100,
					})
					// if latest is nil also get mentions history
					mentions, merr := notesService.Mentions(n.MentionsRequest{
						Limit: 100,
					})
					if err != nil {
						fmt.Println(err.Error())
					}
					if merr != nil {
						fmt.Println(merr.Error())
					}

					// check the cache for everything we just collected
					// if anything is newer or as of yet not in the cache, add it
					// and convert it to a SocketData implementation before sending on data channel
					for _, n := range notes {
						msg := self.cacheAndConvert(n)
						if msg != nil {
							self.data <- msg
						}
					}
					for _, n := range mentions {
						msg := self.cacheAndConvert(n)
						if msg != nil {
							self.data <- msg
						}
					}

				} else {
					for {
						// get notes since latest, until the probe
						notes, err := timelineService.Get(tl.GetRequest{
							SinceDate: uint64(latest.Unix()),
							UntilDate: uint64(probenote[0].CreatedAt.Unix()),
							Limit:     100,
						})
						if err != nil {
							fmt.Println(err.Error())
						}
						for _, n := range notes {
							msg := self.cacheAndConvert(n)
							if msg == nil {
								latest = &probenote[0].CreatedAt
								break
							}
							self.data <- msg
						}
						if *latest == probenote[0].CreatedAt {
							break
						}
					}
				}
			}

			time.Sleep(5 * time.Second)
		}

	}

}

func (self *MisskeyAdapter) isNew(n mkm.Note) bool {
	timestamp, exists := self.cache[n.ID]
	return !exists || timestamp.Before(n.CreatedAt)
}

func (self *MisskeyAdapter) cacheAndConvert(n mkm.Note) *Message {
	timestamp, exists := self.cache[n.ID]
	if !exists || timestamp.Before(n.CreatedAt) {
		self.cache[n.ID] = n.CreatedAt
		msg := Message{
			Datagram: Datagram{
				Id:       n.ID,
				Uri:      n.URI,
				Protocol: "misskey",
				Adapter:  self.nickname,
				Type:     "message",
			},

			Created: n.CreatedAt,

			Author:      fmt.Sprintf("%s@%s", n.User.Username, mkcore.StringValue(n.User.Host)),
			Content:     n.Text,
			Attachments: []Attachment{},
			Visibility:  n.Visibility,
			ReplyTo:     n.ReplyID,
			ReplyCount:  int(n.RepliesCount),
			Replies:     []string{},
		}

		for _, f := range n.Files {
			msg.Attachments = append(msg.Attachments, Attachment{
				Src:       f.URL,
				ThumbSrc:  f.ThumbnailURL,
				Size:      f.Size,
				Desc:      f.Comment,
				CreatedAt: f.CreatedAt,
			})
		}
		return &msg
	}
	return nil
}

func (self *MisskeyAdapter) Fetch(query string) error {
	return nil
}

func (self *MisskeyAdapter) Do(action string) error {
	return nil
}

func (self *MisskeyAdapter) DefaultSubscriptionFilter() string {
	return ""
}