package chat

import (
	"context"
	"log/slog"

	"github.com/ayn2op/discordo/internal/http"
	"github.com/ayn2op/discordo/internal/notifications"
	"github.com/ayn2op/tview"
	"github.com/diamondburned/arikawa/v3/gateway"
	"github.com/diamondburned/arikawa/v3/session"
	"github.com/diamondburned/arikawa/v3/state"
	"github.com/diamondburned/arikawa/v3/state/store/defaultstore"
	"github.com/diamondburned/arikawa/v3/utils/handler"
	"github.com/diamondburned/arikawa/v3/utils/httputil"
	"github.com/diamondburned/arikawa/v3/utils/httputil/httpdriver"
	"github.com/diamondburned/arikawa/v3/utils/ws"
	"github.com/diamondburned/ningen/v3"
)

func (v *View) OpenState(token string) error {
	identifyProps := http.IdentifyProperties()
	gateway.DefaultIdentity = identifyProps
	gateway.DefaultPresence = &gateway.UpdatePresenceCommand{
		Status: v.cfg.Status,
	}

	id := gateway.DefaultIdentifier(token)
	id.Compress = false

	session := session.NewCustom(id, http.NewClient(token), handler.New())
	state := state.NewFromSession(session, defaultstore.New())
	v.state = ningen.FromState(state)

	// Handlers
	v.state.AddHandler(v.onRaw)
	v.state.AddHandler(v.onReady)
	v.state.AddHandler(v.onMessageCreate)
	v.state.AddHandler(v.onMessageUpdate)
	v.state.AddHandler(v.onMessageDelete)
	v.state.AddHandler(v.onReadUpdate)
	v.state.AddHandler(v.onGuildMembersChunk)
	v.state.AddHandler(v.onGuildMemberRemove)

	if v.cfg.TypingIndicator.Receive {
		v.state.AddHandler(v.onTypingStart)
	}

	v.state.StateLog = func(err error) {
		slog.Error("state log", "err", err)
	}

	v.state.OnRequest = append(v.state.OnRequest, httputil.WithHeaders(http.Headers()), v.onRequest)
	return v.state.Open(context.TODO())
}

func (v *View) CloseState() error {
	if v.state == nil {
		return nil
	}
	return v.state.Close()
}

func (v *View) onRequest(r httpdriver.Request) error {
	if req, ok := r.(*httpdriver.DefaultRequest); ok {
		slog.Debug("new HTTP request", "method", req.Method, "url", req.URL)
	}

	return nil
}

func (v *View) onRaw(event *ws.RawEvent) {
	slog.Debug(
		"new raw event",
		"code", event.OriginalCode,
		"type", event.OriginalType,
		// "data", event.Raw,
	)
}

func (v *View) onReady(r *gateway.ReadyEvent) {
	dmNode := tview.NewTreeNode("Direct Messages")
	root := v.guildsTree.
		GetRoot().
		ClearChildren().
		AddChild(dmNode)

	for _, folder := range r.UserSettings.GuildFolders {
		if folder.ID == 0 && len(folder.GuildIDs) == 1 {
			guild, err := v.state.Cabinet.Guild(folder.GuildIDs[0])
			if err != nil {
				slog.Error(
					"failed to get guild from state",
					"guild_id",
					folder.GuildIDs[0],
					"err",
					err,
				)
				continue
			}

			v.guildsTree.createGuildNode(root, *guild)
		} else {
			v.guildsTree.createFolderNode(folder)
		}
	}

	v.guildsTree.SetCurrentNode(root)
	v.app.SetFocus(v.guildsTree)
	v.app.Draw()
}

func (v *View) onMessageCreate(message *gateway.MessageCreateEvent) {
	selectedChannel := v.SelectedChannel()
	if selectedChannel != nil && selectedChannel.ID == message.ChannelID {
		v.removeTyper(message.Author.ID)
		v.messagesList.drawMessage(v.messagesList, message.Message)
		v.app.Draw()
	} else {
		if err := notifications.Notify(v.state, message, v.cfg); err != nil {
			slog.Error("failed to notify", "err", err, "channel_id", message.ChannelID, "message_id", message.ID)
		}
	}
}

func (v *View) onMessageUpdate(message *gateway.MessageUpdateEvent) {
	if selected := v.SelectedChannel(); selected != nil && selected.ID == message.ChannelID {
		v.onMessageDelete(&gateway.MessageDeleteEvent{ID: message.ID, ChannelID: message.ChannelID, GuildID: message.GuildID})
	}
}

func (v *View) onMessageDelete(message *gateway.MessageDeleteEvent) {
	if selected := v.SelectedChannel(); selected != nil && selected.ID == message.ChannelID {
		messages, err := v.state.Cabinet.Messages(message.ChannelID)
		if err != nil {
			slog.Error("failed to get messages from state", "err", err, "channel_id", message.ChannelID)
			return
		}

		v.messagesList.reset()
		v.messagesList.drawMessages(messages)
		v.app.Draw()
	}
}

func (v *View) onGuildMembersChunk(event *gateway.GuildMembersChunkEvent) {
	v.messagesList.setFetchingChunk(false, uint(len(event.Members)))
}

func (v *View) onGuildMemberRemove(event *gateway.GuildMemberRemoveEvent) {
	v.messageInput.cache.Invalidate(event.GuildID.String()+" "+event.User.Username, v.state.MemberState.SearchLimit)
}

func (v *View) onTypingStart(event *gateway.TypingStartEvent) {
	selectedChannel := v.SelectedChannel()
	if selectedChannel == nil {
		return
	}

	if selectedChannel.ID != event.ChannelID {
		return
	}

	me, err := v.state.Cabinet.Me()
	if err != nil {
		slog.Error("failed to get me from state", "err", err)
		return
	}

	if event.UserID == me.ID {
		return
	}

	v.addTyper(event.UserID)
}