"use server";

import { db } from "@/lib/db";
import {
    users,
    youtubeVideos,
    detectedObjects,
    interestPledges,
    productRequests,
    affiliateProposals,
} from "@/lib/db/schema";
import { count, eq, sql } from "drizzle-orm";
import { auth } from "@/lib/auth";
import { headers } from "next/headers";
import { redirect } from "next/navigation";

/**
 * Ensures the user is an authorized admin.
 * Uses ADMIN_EMAILS from environment variables.
 */
async function ensureAdmin() {
    const session = await auth.api.getSession({
        headers: await headers()
    });

    const adminEmails = process.env.ADMIN_EMAILS?.split(",") || [];
    if (!session?.user?.email || !adminEmails.includes(session.user.email)) {
        throw new Error("Unauthorized");
    }
}

export async function getAdminStats() {
    await ensureAdmin();

    const [userCount] = await db.select({ count: count() }).from(users);
    const [pendingAnalysis] = await db.select({ count: count() }).from(youtubeVideos).where(eq(youtubeVideos.scanStatus, 'pending_analysis'));
    const [awaitingApproval] = await db.select({ count: count() }).from(youtubeVideos).where(eq(youtubeVideos.scanStatus, 'awaiting_approval'));
    const [totalProducts] = await db.select({ count: count() }).from(detectedObjects);

    // Interest Items: Detections with 1+ "I want this" requests
    const interestCount = await db
        .select({ count: sql<number>`count(distinct ${detectedObjects.id})` })
        .from(detectedObjects)
        .innerJoin(interestPledges, eq(detectedObjects.id, interestPledges.detectedObjectId))
        .groupBy(detectedObjects.id)
        .having(sql`count(${interestPledges.id}) >= 1`);

    // Pending Community Requests
    const [pendingRequests] = await db.select({ count: count() })
        .from(productRequests)
        .where(eq(productRequests.status, 'PENDING'));

    // Pending Affiliate Proposals
    const [pendingProposals] = await db.select({ count: count() })
        .from(affiliateProposals)
        .where(eq(affiliateProposals.status, 'PENDING'));

    return {
        totalUsers: Number(userCount.count),
        pendingAnalysis: Number(pendingAnalysis.count),
        awaitingApproval: Number(awaitingApproval.count),
        totalProducts: Number(totalProducts.count),
        highInterestItems: interestCount.length,
        pendingRequests: Number(pendingRequests.count),
        pendingProposals: Number(pendingProposals.count),
    };
}