package store

import (
	"spider/internal/model"
	"strings"

	"gorm.io/gorm"
)

// UpsertChannel inserts or updates a channel by username.
func (s *Store) UpsertChannel(ch *model.Channel) error {
	ch.Username = strings.TrimPrefix(strings.TrimSpace(ch.Username), "@")
	if ch.Username == "" {
		return nil
	}

	var existing model.Channel
	err := s.DB.Where("username = ?", ch.Username).First(&existing).Error
	if err == gorm.ErrRecordNotFound {
		return s.DB.Create(ch).Error
	}
	if err != nil {
		return err
	}
	// already exists, skip
	return nil
}

// ListPendingChannels returns channels with status=pending, up to limit.
func (s *Store) ListPendingChannels(limit int) ([]model.Channel, error) {
	var channels []model.Channel
	q := s.DB.Where("status = ?", "pending")
	if limit > 0 {
		q = q.Limit(limit)
	}
	err := q.Find(&channels).Error
	return channels, err
}

// UpdateChannelStatus sets the status and optionally last_message_id.
func (s *Store) UpdateChannelStatus(id uint, status string, lastMessageID int) error {
	updates := map[string]any{"status": status}
	if lastMessageID > 0 {
		updates["last_message_id"] = lastMessageID
	}
	return s.DB.Model(&model.Channel{}).Where("id = ?", id).Updates(updates).Error
}

// UpdateChannelEntity caches the TG entity IDs for a channel.
func (s *Store) UpdateChannelEntity(id uint, channelID, accessHash int64) error {
	return s.DB.Model(&model.Channel{}).Where("id = ?", id).
		Updates(map[string]any{"channel_id": channelID, "access_hash": accessHash}).Error
}

// IncrementMerchantsFound increments the merchants_found counter.
func (s *Store) IncrementMerchantsFound(id uint) error {
	return s.DB.Model(&model.Channel{}).Where("id = ?", id).
		Update("merchants_found", gorm.Expr("merchants_found + 1")).Error
}