import { NextRequest, NextResponse } from 'next/server';
import { db } from '@/lib/db';
import { bookings, courts, timeSlots } from '@/lib/db/schema';
import { eq, and } from 'drizzle-orm';
import { getSession } from '@/lib/session';
import { logActivity, ACTIONS, ENTITY_TYPES } from '@/lib/activity-logger';

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

		const userBookings = await db
			.select({
				id: bookings.id,
				courtId: bookings.courtId,
				date: bookings.date,
				startTime: bookings.startTime,
				endTime: bookings.endTime,
				status: bookings.status,
				notes: bookings.notes,
				createdAt: bookings.createdAt,
				court: {
					id: courts.id,
					name: courts.name,
				},
			})
			.from(bookings)
			.innerJoin(courts, eq(bookings.courtId, courts.id))
			.where(eq(bookings.userId, session.userId));

		return NextResponse.json({ bookings: userBookings });
	} catch (error) {
		console.error('Error fetching bookings:', error);
		return NextResponse.json({ error: 'Internal server error' }, { status: 500 });
	}
}

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

		const { courtId, date, timeSlot } = await request.json();

		if (!courtId || !date || !timeSlot) {
			return NextResponse.json(
				{
					error: 'Missing required fields: courtId, date, timeSlot',
				},
				{ status: 400 }
			);
		}

		// Parse timeSlot (e.g., "14:00") to get start and end times
		const startTime = timeSlot;
		const [hours, minutes] = timeSlot.split(':').map(Number);
		const endTime = `${String(hours + 1).padStart(2, '0')}:${String(minutes).padStart(2, '0')}`;

		// Validate booking date is not in the past
		const bookingDate = new Date(date);
		const today = new Date();
		today.setHours(0, 0, 0, 0);

		if (bookingDate < today) {
			return NextResponse.json(
				{
					error: 'Cannot book dates in the past',
				},
				{ status: 400 }
			);
		}

		// Check if court exists and is active
		const court = await db.select().from(courts).where(eq(courts.id, courtId)).limit(1);
		if (court.length === 0 || !court[0].isActive) {
			return NextResponse.json(
				{
					error: 'Court not found or inactive',
				},
				{ status: 400 }
			);
		}

		// CRITICAL: Validate that booking is allowed for this day and time
		const dayOfWeek = bookingDate.getDay();
		const availableTimeSlots = await db
			.select()
			.from(timeSlots)
			.where(
				and(
					eq(timeSlots.dayOfWeek, dayOfWeek),
					eq(timeSlots.isActive, true)
				)
			);

		// Check if any time slots are configured for this day
		if (availableTimeSlots.length === 0) {
			return NextResponse.json(
				{
					error: `No bookings are allowed on ${['Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday'][dayOfWeek]}s. The facility is closed on this day.`,
				},
				{ status: 400 }
			);
		}

		// Check if the requested time slot is within any of the allowed time ranges
		const requestedHour = parseInt(startTime.split(':')[0]);
		const isTimeSlotValid = availableTimeSlots.some(slot => {
			const slotStartHour = parseInt(slot.startTime.split(':')[0]);
			const slotEndHour = parseInt(slot.endTime.split(':')[0]);
			return requestedHour >= slotStartHour && requestedHour < slotEndHour;
		});

		if (!isTimeSlotValid) {
			const allowedRanges = availableTimeSlots.map(slot => `${slot.startTime}-${slot.endTime}`).join(', ');
			return NextResponse.json(
				{
					error: `Time slot ${startTime} is not available on ${['Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday'][dayOfWeek]}s. Available times: ${allowedRanges}`,
				},
				{ status: 400 }
			);
		}

		// Check if slot is already booked
		const existingBooking = await db
			.select()
			.from(bookings)
			.where(
				and(
					eq(bookings.courtId, courtId),
					eq(bookings.date, date),
					eq(bookings.startTime, startTime),
					eq(bookings.status, 'active')
				)
			)
			.limit(1);

		if (existingBooking.length > 0) {
			return NextResponse.json(
				{
					error: 'Time slot already booked',
				},
				{ status: 400 }
			);
		}

		// Create the booking
		const [newBooking] = await db
			.insert(bookings)
			.values({
				id: crypto.randomUUID(),
				userId: session.userId,
				courtId,
				date,
				startTime,
				endTime,
				status: 'active',
				createdAt: new Date(),
				updatedAt: new Date(),
			})
			.returning();

		// Log the activity
		await logActivity({
			userId: session.userId,
			action: ACTIONS.BOOKING_CREATE,
			entityType: ENTITY_TYPES.BOOKING,
			entityId: newBooking.id,
			details: {
				courtId,
				courtName: court[0].name,
				date,
				startTime,
				endTime,
			},
			request,
		});

		return NextResponse.json({
			booking: newBooking,
			message: 'Booking created successfully',
		});
	} catch (error) {
		console.error('Error creating booking:', error);
		return NextResponse.json({ error: 'Internal server error' }, { status: 500 });
	}
}