package vk

import (
	"context"
	"fmt"
	"log/slog"

	"github.com/SevereCloud/vksdk/v2/api"
	"github.com/SevereCloud/vksdk/v2/events"
	"github.com/SevereCloud/vksdk/v2/longpoll-bot"
)

type VK struct {
	api *api.VK
	lp  *longpoll.LongPoll
}

func New(logger *slog.Logger, api_key string, video_links chan string) (*VK, error) {
	const op = "vk.New"

	vk := api.NewVK(api_key)

	// get information about the group
	group, err := vk.GroupsGetByID(nil)
	if err != nil {
		return nil, fmt.Errorf("cannot get group info: %s: %w", op, err)
	}

	// Initializing Long Poll
	lp, err := longpoll.NewLongPoll(vk, group[0].ID)
	if err != nil {
		return nil, fmt.Errorf("%s: %w", op, err)
	}
	// New message event
	lp.MessageNew(func(_ context.Context, obj events.MessageNewObject) {
		logger.Info("Message", "peer", obj.Message.PeerID, "text", obj.Message.Text)
		for _, obj := range obj.Message.Attachments {
		objectsw:
			switch obj.Type {
			case "story":
				// fmt.Printf("Story %+v\n", obj.Story.Video.Files)
				// get video link from struct
				var videolink string
				switch {
				case obj.Story.Video.Files.Mp4_720 != "":
					videolink = obj.Story.Video.Files.Mp4_720
				case obj.Story.Video.Files.Mp4_480 != "":
					videolink = obj.Story.Video.Files.Mp4_480
				case obj.Story.Video.Files.Mp4_360 != "":
					videolink = obj.Story.Video.Files.Mp4_360
				case obj.Story.Video.Files.Mp4_240 != "":
					videolink = obj.Story.Video.Files.Mp4_240
				default:
					logger.Error("cannot find video link")
					break objectsw
				}
				// fmt.Println("Story:", videolink)
				if err != nil {
					logger.Error("vk error", "err", err)
				}
				// send video to tg
				video_links <- videolink
			case "video":
				// logger.Info("Video", "owner", obj.Video.OwnerID, "id", obj.Video.ID)
				owner := obj.Video.OwnerID
				video_id := obj.Video.ID
				videolink, err := fetchVideoURL(owner, video_id)
				if err != nil {
					logger.Error("cannot get video link", "err", err)
				}
				video_links <- videolink
			default:
				logger.Debug("Message type not found", "type", obj.Type, "obj", fmt.Sprintf("%+v", obj))
			}
		}
	})

	return &VK{
		api: vk,
		lp:  lp,
	}, nil
}

// Run starts message listening.
func (vk *VK) MustRun() {
	// Run Bots Long Poll
	if err := vk.lp.Run(); err != nil {
		panic(err)
	}
}