package store

import (
	"context"
)

// MessageHit is a search result: a message scoped to the member's
// conversations, with its conversation context.
type MessageHit struct {
	Message
	ConversationType string
	ConversationName string
}

// SearchMessages finds messages matching query in conversations the user
// belongs to, newest first. ILIKE substring matching keeps the search
// dependency-free at family scale; pg_trgm is the documented scaling path.
func (s *Store) SearchMessages(ctx context.Context, userID int64, query string, limit int) ([]MessageHit, error) {
	if query == "" {
		return nil, nil
	}
	pattern := "%" + query + "%"
	rows, err := s.pool.Query(ctx, `
       SELECT m.id, m.conversation_id, m.sender_id, m.body, m.media_id, m.created_at, m.edited_at, m.deleted_at,
              c.type, c.name
       FROM messages m
       JOIN conversation_members cm ON cm.conversation_id = m.conversation_id AND cm.user_id = $1
       JOIN conversations c ON c.id = m.conversation_id
       WHERE m.body ILIKE $2
       ORDER BY m.id DESC
       LIMIT $3
   `, userID, pattern, limit)
	if err != nil {
		return nil, err
	}
	defer rows.Close()

	var hits []MessageHit
	for rows.Next() {
		var h MessageHit
		if err := rows.Scan(
			&h.ID, &h.ConversationID, &h.SenderID, &h.Body, &h.MediaID, &h.CreatedAt, &h.EditedAt, &h.DeletedAt,
			&h.ConversationType, &h.ConversationName,
		); err != nil {
			return nil, err
		}
		hits = append(hits, h)
	}
	return hits, nil
}