package telegram

import (
	"context"
	"fmt"
	"time"

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

func (t *Telegram) GetChannelHistory(ctx context.Context, channel domain.Channel, limit int) ([]domain.Post, error) {
	log.Info().Msg(channel.String())

	req := &tg.MessagesGetHistoryRequest{
		Peer: &tg.InputPeerChannel{
			ChannelID:  channel.ChannelID(),
			AccessHash: channel.AccessHash,
		},
		Limit: limit,
	}

	resp, err := t.API().MessagesGetHistory(ctx, req)
	if err != nil {
		return nil, fmt.Errorf("resp: %w", err)
	}

	messages, ok := resp.(*tg.MessagesChannelMessages)
	if !ok {
		return nil, nil
	}

	posts := make([]domain.Post, 0, len(messages.Messages))

	for _, raw := range messages.Messages {
		m, ok := raw.(*tg.Message)
		if !ok {
			continue
		}

		text := messageToHTML(m.Message, m.Entities)
		publishedAt := time.Unix(int64(m.Date), 0).UTC()
		p := domain.NewPost(channel, m.ID, text, m.Views, publishedAt)
		posts = append(posts, p)
	}

	return posts, nil
}