import { NextRequest, NextResponse } from 'next/server';
import { db } from '@/lib/db';
import { courtBlocks, courts, users, announcements } from '@/lib/db/schema';
import { eq, gte, asc } 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 || session.role !== 'admin') {
			return NextResponse.json({ error: 'Unauthorized' }, { status: 401 });
		}

		const { searchParams } = new URL(request.url);
		const includeExpired = searchParams.get('includeExpired') === 'true';

		// Get today's date
		const today = new Date().toISOString().split('T')[0];

		// Fetch blocks with court and creator info
		let query = db
			.select({
				id: courtBlocks.id,
				courtId: courtBlocks.courtId,
				date: courtBlocks.date,
				startTime: courtBlocks.startTime,
				endTime: courtBlocks.endTime,
				reason: courtBlocks.reason,
				createdBy: courtBlocks.createdBy,
				createdAt: courtBlocks.createdAt,
				court: {
					id: courts.id,
					name: courts.name,
				},
				creator: {
					id: users.id,
					name: users.name,
					surname: users.surname,
				},
			})
			.from(courtBlocks)
			.leftJoin(courts, eq(courtBlocks.courtId, courts.id))
			.innerJoin(users, eq(courtBlocks.createdBy, users.id));

		const rawBlocks = includeExpired
			? await query.orderBy(asc(courtBlocks.date), asc(courtBlocks.startTime))
			: await query
					.where(gte(courtBlocks.date, today))
					.orderBy(asc(courtBlocks.date), asc(courtBlocks.startTime));

		// Transform to flat structure for frontend
		const blocks = rawBlocks.map((block) => ({
			id: block.id,
			courtId: block.courtId,
			courtName: block.court?.name || null,
			date: block.date,
			startTime: block.startTime,
			endTime: block.endTime,
			reason: block.reason,
			createdBy: block.createdBy,
			creatorName: block.creator ? `${block.creator.name} ${block.creator.surname}` : 'Unknown',
			createdAt: block.createdAt,
		}));

		return NextResponse.json({ blocks });
	} catch (error) {
		console.error('Error fetching blocks:', 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 { courtId, date, startTime, endTime, reason, createAnnouncement } = await request.json();

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

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

		if (blockDate < today) {
			return NextResponse.json({ error: 'Cannot create blocks for past dates' }, { status: 400 });
		}

		// Get court name if courtId is provided
		let courtName = 'All Courts';
		if (courtId) {
			const court = await db.select().from(courts).where(eq(courts.id, courtId)).limit(1);
			if (court.length === 0) {
				return NextResponse.json({ error: 'Court not found' }, { status: 400 });
			}
			courtName = court[0].name;
		}

		// Create the block
		const blockId = crypto.randomUUID();
		const [newBlock] = await db
			.insert(courtBlocks)
			.values({
				id: blockId,
				courtId: courtId || null, // null means all courts
				date,
				startTime,
				endTime,
				reason,
				createdBy: session.userId,
				createdAt: new Date(),
			})
			.returning();

		// Log activity
		await logActivity({
			userId: session.userId,
			action: ACTIONS.BLOCK_CREATE,
			entityType: ENTITY_TYPES.COURT_BLOCK,
			entityId: blockId,
			details: {
				courtId: courtId || 'all',
				date,
				startTime,
				endTime,
				reason,
			},
		});

		// Optionally create an announcement that expires when the block ends
		let announcementCreated = false;
		if (createAnnouncement) {
			const formattedDate = new Date(date).toLocaleDateString('en-IE', {
				weekday: 'long',
				day: 'numeric',
				month: 'long',
				year: 'numeric',
			});

			// Set expiry to end of block day at the end time
			const expiryDate = new Date(date);
			const [endHour] = endTime.split(':').map(Number);
			expiryDate.setHours(endHour, 0, 0, 0);

			await db.insert(announcements).values({
				id: crypto.randomUUID(),
				title: `${reason} - ${formattedDate}`,
				content: `${courtName} will be unavailable on ${formattedDate} from ${startTime} to ${endTime} due to: ${reason}`,
				priority: 'high',
				expiresAt: expiryDate,
				isActive: true,
				createdAt: new Date(),
				updatedAt: new Date(),
			});
			announcementCreated = true;
		}

		return NextResponse.json({
			block: newBlock,
			announcementCreated,
			message: 'Block created successfully',
		});
	} catch (error) {
		console.error('Error creating block:', error);
		return NextResponse.json({ error: 'Internal server error' }, { status: 500 });
	}
}