import { userTimers } from "@/db/schema";
import { eq, and, lt } from "drizzle-orm";
import { DrizzleClient } from "@/lib/DrizzleClient";

/**
 * The Janitor responsible for cleaning up expired ACCESS timers
 * and revoking privileges.
 */
export const schedulerService = {
    start: () => {
        console.log("🕒 Scheduler started: Janitor loop running every 60s");
        // Run immediately on start
        schedulerService.runJanitor();

        // Loop every 60 seconds
        setInterval(() => {
            schedulerService.runJanitor();
        }, 60 * 1000);
    },

    runJanitor: async () => {
        try {
            // Find all expired ACCESS timers
            // We do this in a transaction to ensure we read and delete atomically if possible,
            // though for this specific case, fetching then deleting is fine as long as we handle race conditions gracefully.

            const now = new Date();

            const expiredAccess = await DrizzleClient.query.userTimers.findMany({
                where: and(
                    eq(userTimers.type, 'ACCESS'),
                    lt(userTimers.expiresAt, now)
                )
            });

            if (expiredAccess.length === 0) return;

            console.log(`🧹 Janitor: Found ${expiredAccess.length} expired access timers.`);

            for (const timer of expiredAccess) {
                // TODO: Here we would call Discord API to remove roles/overwrites.
                const meta = timer.metadata as any;
                console.log(`🚫 Revoking access for User ${timer.userId}: Key=${timer.key} (Channel: ${meta?.channelId || 'N/A'})`);

                // Delete the timer row
                await DrizzleClient.delete(userTimers)
                    .where(and(
                        eq(userTimers.userId, timer.userId),
                        eq(userTimers.type, timer.type),
                        eq(userTimers.key, timer.key)
                    ));
            }
        } catch (error) {
            console.error("Janitor Error:", error);
        }
    }
};