import { type Db } from '../../server-impl';

export type GetActiveUsers = () => Promise<{
    last7: number;
    last30: number;
    last60: number;
    last90: number;
}>;

export const createGetActiveUsers =
    (db: Db): GetActiveUsers =>
    async () => {
        const combinedQuery = db
            .select('id as user_id', 'seen_at')
            .from('users')
            .unionAll(
                db.select('user_id', 'seen_at').from('personal_access_tokens'),
            );

        const result = await db
            .with('Combined', combinedQuery)
            .select({
                last_week: db.raw(
                    "COUNT(DISTINCT CASE WHEN seen_at > NOW() - INTERVAL '1 week' THEN user_id END)",
                ),
                last_month: db.raw(
                    "COUNT(DISTINCT CASE WHEN seen_at > NOW() - INTERVAL '1 month' THEN user_id END)",
                ),
                last_two_months: db.raw(
                    "COUNT(DISTINCT CASE WHEN seen_at > NOW() - INTERVAL '2 months' THEN user_id END)",
                ),
                last_quarter: db.raw(
                    "COUNT(DISTINCT CASE WHEN seen_at > NOW() - INTERVAL '3 months' THEN user_id END)",
                ),
            })
            .from('Combined');

        return {
            last7: parseInt(result?.[0]?.last_week || '0', 10),
            last30: parseInt(result?.[0]?.last_month || '0', 10),
            last60: parseInt(result?.[0]?.last_two_months || '0', 10),
            last90: parseInt(result?.[0]?.last_quarter || '0', 10),
        };
    };

export const createFakeGetActiveUsers =
    (
        activeUsers: Awaited<ReturnType<GetActiveUsers>> = {
            last7: 0,
            last30: 0,
            last60: 0,
            last90: 0,
        },
    ): GetActiveUsers =>
    () =>
        Promise.resolve(activeUsers);