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

		const allTimeSlots = await db
			.select()
			.from(timeSlots)
			.orderBy(timeSlots.dayOfWeek, timeSlots.startTime);

		return NextResponse.json({
			timeSlots: allTimeSlots,
		});
	} catch (error) {
		console.error('Error fetching time slots:', error);
		return NextResponse.json({ error: 'Internal server error' }, { status: 500 });
	}
}

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

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

		if (dayOfWeek === undefined || !startTime || !endTime) {
			return NextResponse.json(
				{ error: 'Missing required fields: dayOfWeek, startTime, endTime' },
				{ status: 400 }
			);
		}

		// Validate day of week (0-6)
		if (dayOfWeek < 0 || dayOfWeek > 6) {
			return NextResponse.json(
				{ error: 'dayOfWeek must be between 0 (Sunday) and 6 (Saturday)' },
				{ status: 400 }
			);
		}

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

		const newTimeSlot = await db
			.insert(timeSlots)
			.values({
				id: crypto.randomUUID(),
				dayOfWeek,
				startTime,
				endTime,
				isActive,
				createdAt: new Date(),
				updatedAt: new Date(),
			})
			.returning();

		await logActivity({
			userId: session.userId,
			action: ACTIONS.TIME_SLOT_CREATE,
			entityType: ENTITY_TYPES.TIME_SLOT,
			entityId: newTimeSlot[0].id,
			details: { dayOfWeek, startTime, endTime },
		});

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