import { count, sql } from 'drizzle-orm';
export const countDistinct = async function countDistinct({ column, db, joins, tableName, where }) {
    // When we don't have any joins - use a simple COUNT(*) query.
    if (joins.length === 0) {
        const countResult = await db.select({
            count: column ? count(sql`DISTINCT ${column}`) : count()
        }).from(this.tables[tableName]).where(where);
        return Number(countResult?.[0]?.count ?? 0);
    }
    let query = db.select({
        count: sql`COUNT(1) OVER()`
    }).from(this.tables[tableName]).where(where).groupBy(column ?? this.tables[tableName].id).limit(1).$dynamic();
    joins.forEach(({ type, condition, table })=>{
        query = query[type ?? 'leftJoin'](table, condition);
    });
    // When we have any joins, we need to count each individual ID only once.
    // COUNT(*) doesn't work for this well in this case, as it also counts joined tables.
    // SELECT (COUNT DISTINCT id) has a very slow performance on large tables.
    // Instead, COUNT (GROUP BY id) can be used which is still slower than COUNT(*) but acceptable.
    const countResult = await query;
    return Number(countResult?.[0]?.count ?? 0);
};

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