package internal

import (
	"context"

	"github.com/gotd/td/tg"
	"github.com/pkg/errors"
	"github.com/spf13/cobra"
)

var (
	channelID    int64
	modeHistory  bool
	channelAlias string
)

func ExportCmd() *cobra.Command {
	cmd := &cobra.Command{
		Use:   "export",
		Short: "export channels",
		RunE:  wrapE(exportCmd),
	}

	cmd.Flags().Int64Var(&channelID, "channel", 0, "channel id")
	cmd.Flags().BoolVar(&modeHistory, "history", false, "history mode")
	cmd.Flags().StringVar(&channelAlias, "alias", "", "channel alias")

	return cmd
}

func exportCmd(ctx context.Context) error {
	if channelID == 0 && channelAlias == "" {
		return errors.New("channel id or alias is required")
	}

	var channel *tg.Channel
	var err error
	if channelAlias != "" {
		channel, err = client.ChannelInfoByAlias(ctx, channelAlias)
		if err != nil {
			return err
		}
	} else {
		channel, err = client.ChannelInfoByID(ctx, channelID)
		if err != nil {
			return err
		}
	}

	cfg := NewChannelConfig(channel.ID)
	if err := cfg.Read(ctx); err != nil {
		return err
	}

	// https://t.me/yunpanshare/37426
	return client.Channel(ctx, channel, cfg, modeHistory)
}