import { Server, Upload } from '@repo/tus';
import { prisma } from '@repo/db';
import { getFilenameWithoutExt } from '../utils/file';
import { nanoid } from 'nanoid';
import { slugify } from 'transliteration';
import { StorageManager } from './storage.adapter';

const FILE_UPLOAD_CONFIG = {
	maxSizeBytes: 20_000_000_000, // 20GB
};

export enum QueueJobType {
	UPDATE_STATS = 'update_stats',
	FILE_PROCESS = 'file_process',
	UPDATE_POST_VISIT_COUNT = 'updatePostVisitCount',
	UPDATE_POST_STATE = 'updatePostState',
}

export enum ResourceStatus {
	UPLOADING = 'UPLOADING',
	UPLOADED = 'UPLOADED',
	PROCESS_PENDING = 'PROCESS_PENDING',
	PROCESSING = 'PROCESSING',
	PROCESSED = 'PROCESSED',
	PROCESS_FAILED = 'PROCESS_FAILED',
}

// 全局 TUS 服务器实例
let tusServer: Server | null = null;

function getFileId(uploadId: string) {
	return uploadId.replace(/\/[^/]+$/, '');
}

async function handleUploadCreate(req: any, res: any, upload: Upload, url: string) {
	try {
		const fileId = getFileId(upload.id);
		const storageManager = StorageManager.getInstance();

		await prisma.resource.create({
			data: {
				title: getFilenameWithoutExt(upload.metadata?.filename || 'untitled'),
				fileId, // 移除最后的文件名
				url: upload.id,
				meta: upload.metadata,
				status: ResourceStatus.UPLOADING,
				storageType: storageManager.getStorageType(), // 记录存储类型
			},
		});

		console.log(`Resource created for ${upload.id} using ${storageManager.getStorageType()} storage`);
	} catch (error) {
		console.error('Failed to create resource during upload', error);
	}
}

async function handleUploadFinish(req: any, res: any, upload: Upload) {
	try {
		const resource = await prisma.resource.update({
			where: { fileId: getFileId(upload.id) },
			data: { status: ResourceStatus.UPLOADED },
		});

		// TODO: 这里可以添加队列处理逻辑
		// fileQueue.add(QueueJobType.FILE_PROCESS, { resource }, { jobId: resource.id });
		console.log(`Upload finished ${resource.url} using ${StorageManager.getInstance().getStorageType()} storage`);
	} catch (error) {
		console.error('Failed to update resource after upload', error);
	}
}

function initializeTusServer() {
	if (tusServer) {
		return tusServer;
	}

	// 获取存储管理器实例
	const storageManager = StorageManager.getInstance();
	const dataStore = storageManager.getDataStore();

	tusServer = new Server({
		namingFunction(req, metadata) {
			const safeFilename = slugify(metadata?.filename || 'untitled');
			const now = new Date();
			const year = now.getFullYear();
			const month = String(now.getMonth() + 1).padStart(2, '0');
			const day = String(now.getDate()).padStart(2, '0');
			const uniqueId = nanoid(10);
			return `${year}/${month}/${day}/${uniqueId}/${safeFilename}`;
		},
		path: '/upload',
		datastore: dataStore, // 使用存储适配器
		maxSize: FILE_UPLOAD_CONFIG.maxSizeBytes,
		postReceiveInterval: 1000,
		getFileIdFromRequest: (req, lastPath) => {
			const match = req.url?.match(/\/upload\/(.+)/);
			return match ? match[1] : lastPath;
		},
	});

	// 设置事件处理器
	tusServer.on('POST_CREATE', handleUploadCreate);
	tusServer.on('POST_FINISH', handleUploadFinish);

	console.log(`TUS server initialized with ${storageManager.getStorageType()} storage`);
	return tusServer;
}

export function getTusServer() {
	return initializeTusServer();
}

export async function handleTusRequest(req: any, res: any) {
	const server = getTusServer();
	return server.handle(req, res);
}

export async function cleanupExpiredUploads() {
	try {
		const storageManager = StorageManager.getInstance();

		// 获取过期时间配置，如果设置为 0 则不自动清理
		const expirationPeriod: number = 24 * 60 * 60 * 1000;

		// Delete incomplete uploads older than expiration period
		const deletedResources = await prisma.resource.deleteMany({
			where: {
				createdAt: {
					lt: new Date(Date.now() - expirationPeriod),
				},
				status: ResourceStatus.UPLOADING,
			},
		});

		const server = getTusServer();
		const expiredUploadCount = await server.cleanUpExpiredUploads();

		console.log(
			`Cleanup complete: ${deletedResources.count} resources and ${expiredUploadCount} uploads removed from ${storageManager.getStorageType()} storage`,
		);

		return { deletedResources: deletedResources.count, expiredUploads: expiredUploadCount };
	} catch (error) {
		console.error('Expired uploads cleanup failed', error);
		throw error;
	}
}

// 获取存储信息
export function getStorageInfo() {
	const storageManager = StorageManager.getInstance();
	return storageManager.getStorageInfo();
}