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

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

		const { id } = params;
		const { dayOfWeek, startTime, endTime, isActive } = await request.json();

		// Check if time slot exists
		const existingTimeSlot = await db.select().from(timeSlots).where(eq(timeSlots.id, id)).limit(1);
		if (existingTimeSlot.length === 0) {
			return NextResponse.json({ error: 'Time slot not found' }, { status: 404 });
		}

		// Validate inputs if provided
		if (dayOfWeek !== undefined && (dayOfWeek < 0 || dayOfWeek > 6)) {
			return NextResponse.json(
				{ error: 'dayOfWeek must be between 0 (Sunday) and 6 (Saturday)' },
				{ status: 400 }
			);
		}

		const timeRegex = /^([0-1]?[0-9]|2[0-3]):[0-5][0-9]$/;
		if (startTime && !timeRegex.test(startTime)) {
			return NextResponse.json(
				{ error: 'Invalid startTime format. Use HH:MM format' },
				{ status: 400 }
			);
		}

		if (endTime && !timeRegex.test(endTime)) {
			return NextResponse.json(
				{ error: 'Invalid endTime format. Use HH:MM format' },
				{ status: 400 }
			);
		}

		const updatedTimeSlot = await db
			.update(timeSlots)
			.set({
				...(dayOfWeek !== undefined && { dayOfWeek }),
				...(startTime && { startTime }),
				...(endTime && { endTime }),
				...(isActive !== undefined && { isActive }),
				updatedAt: new Date(),
			})
			.where(eq(timeSlots.id, id))
			.returning();

		await logActivity({
			userId: session.userId,
			action: ACTIONS.TIME_SLOT_UPDATE,
			entityType: ENTITY_TYPES.TIME_SLOT,
			entityId: id,
			details: { dayOfWeek, startTime, endTime, isActive },
		});

		return NextResponse.json({
			message: 'Time slot updated successfully',
			timeSlot: updatedTimeSlot[0],
		});
	} catch (error) {
		console.error('Error updating time slot:', error);
		return NextResponse.json({ error: 'Internal server error' }, { status: 500 });
	}
}

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

		const { id } = params;

		// Check if time slot exists
		const existingTimeSlot = await db.select().from(timeSlots).where(eq(timeSlots.id, id)).limit(1);
		if (existingTimeSlot.length === 0) {
			return NextResponse.json({ error: 'Time slot not found' }, { status: 404 });
		}

		await db.delete(timeSlots).where(eq(timeSlots.id, id));

		await logActivity({
			userId: session.userId,
			action: ACTIONS.TIME_SLOT_DELETE,
			entityType: ENTITY_TYPES.TIME_SLOT,
			entityId: id,
			details: { deleted: existingTimeSlot[0] },
		});

		return NextResponse.json({
			message: 'Time slot deleted successfully',
		});
	} catch (error) {
		console.error('Error deleting time slot:', error);
		return NextResponse.json({ error: 'Internal server error' }, { status: 500 });
	}
}