import { NextRequest, NextResponse } from 'next/server';
import { getSession } from '@/lib/session';
import { db } from '@/lib/db';
import { users, courts, bookings, metrics } from '@/lib/db/schema';
import { eq, and, gte, lte, desc, count } from 'drizzle-orm';

export async function GET(request: NextRequest) {
	try {
		const session = await getSession();
		if (!session || session.role !== 'admin') {
			return NextResponse.json({ error: 'Unauthorized' }, { status: 401 });
		}

		// Get real stats from database
		const totalUsers = await db.select({ count: count() }).from(users);
		const activeCourts = await db.select({ count: count() }).from(courts).where(eq(courts.isActive, true));

		// Get today's bookings count
		const today = new Date().toISOString().split('T')[0];
		const todaysBookings = await db
			.select({ count: count() })
			.from(bookings)
			.where(and(eq(bookings.date, today), eq(bookings.status, 'active')));

		// Get current month's bookings from metrics table
		const currentMonth = new Date().toISOString().substring(0, 7); // "2025-09"
		const monthlyBookings = await db
			.select()
			.from(metrics)
			.where(and(eq(metrics.metricType, 'monthly_bookings'), eq(metrics.period, currentMonth)))
			.limit(1);

		// Get recent bookings with user names
		const recentBookings = await db
			.select({
				id: bookings.id,
				date: bookings.date,
				startTime: bookings.startTime,
				endTime: bookings.endTime,
				courtName: courts.name,
				userName: users.name,
				userSurname: users.surname,
				status: bookings.status,
				createdAt: bookings.createdAt,
			})
			.from(bookings)
			.leftJoin(users, eq(bookings.userId, users.id))
			.leftJoin(courts, eq(bookings.courtId, courts.id))
			.orderBy(desc(bookings.createdAt))
			.limit(10);

		return NextResponse.json({
			stats: {
				totalUsers: totalUsers[0]?.count || 0,
				activeCourts: activeCourts[0]?.count || 0,
				todaysBookings: todaysBookings[0]?.count || 0,
				monthlyBookings: monthlyBookings[0]?.value || 0,
			},
			recentBookings: recentBookings.map((booking) => ({
				...booking,
				userName: `${booking.userName} ${booking.userSurname}`,
			})),
		});
	} catch (error) {
		console.error('Error fetching admin stats:', error);
		return NextResponse.json({ error: 'Internal server error' }, { status: 500 });
	}
}