package telegram

import (
	"context"
	"fmt"

	"github.com/TelegramExchange/tgex-backend/tg_parser/internal/domain"
	"github.com/gotd/td/tg"
)

func (t *Telegram) GetChannelPTS(ctx context.Context, channel domain.Channel) (int, error) {
	req := []tg.InputDialogPeerClass{
		&tg.InputDialogPeer{
			Peer: &tg.InputPeerChannel{
				ChannelID:  channel.ChannelID(),
				AccessHash: channel.AccessHash,
			},
		},
	}

	dialogs, err := t.API().MessagesGetPeerDialogs(ctx, req)
	if err != nil {
		return 0, fmt.Errorf("peer dialogs: %w", err)
	}

	if len(dialogs.Dialogs) > 0 {
		if d, ok := dialogs.Dialogs[0].(*tg.Dialog); ok {
			return d.Pts, nil
		}
	}

	return 0, nil
}