import { useState } from 'react';
import { useTusUpload } from './useTusUpload';

interface DownloadProgress {
	loaded: number;
	total: number;
	percentage: number;
}

export function useFileDownload() {
	const { getFileUrlByFileId, serverUrl } = useTusUpload();
	const [downloadProgress, setDownloadProgress] = useState<DownloadProgress | null>(null);
	const [isDownloading, setIsDownloading] = useState(false);
	const [downloadError, setDownloadError] = useState<string | null>(null);

	// 直接下载文件（浏览器处理）
	const downloadFile = (fileId: string, filename?: string) => {
		const url = getFileUrlByFileId(fileId);
		const link = document.createElement('a');
		link.href = url;
		if (filename) {
			link.download = filename;
		}
		link.target = '_blank';
		document.body.appendChild(link);
		link.click();
		document.body.removeChild(link);
	};

	// 带进度的文件下载
	const downloadFileWithProgress = async (
		fileId: string,
		filename?: string,
		onProgress?: (progress: DownloadProgress) => void,
	): Promise<Blob> => {
		return new Promise(async (resolve, reject) => {
			setIsDownloading(true);
			setDownloadError(null);
			setDownloadProgress(null);

			try {
				const url = getFileUrlByFileId(fileId);
				const response = await fetch(url);

				if (!response.ok) {
					throw new Error(`HTTP error! status: ${response.status}`);
				}

				const contentLength = response.headers.get('Content-Length');
				const total = contentLength ? parseInt(contentLength, 10) : 0;
				let loaded = 0;

				const reader = response.body?.getReader();
				if (!reader) {
					throw new Error('Failed to get response reader');
				}

				const chunks: Uint8Array[] = [];

				while (true) {
					const { done, value } = await reader.read();

					if (done) break;

					if (value) {
						chunks.push(value);
						loaded += value.length;

						const progress = {
							loaded,
							total,
							percentage: total > 0 ? Math.round((loaded / total) * 100) : 0,
						};

						setDownloadProgress(progress);
						onProgress?.(progress);
					}
				}

				// 创建 Blob
				const blob = new Blob(chunks);

				// 如果提供了文件名，自动下载
				if (filename) {
					const downloadUrl = URL.createObjectURL(blob);
					const link = document.createElement('a');
					link.href = downloadUrl;
					link.download = filename;
					document.body.appendChild(link);
					link.click();
					document.body.removeChild(link);
					URL.revokeObjectURL(downloadUrl);
				}

				setIsDownloading(false);
				setDownloadProgress(null);
				resolve(blob);
			} catch (error) {
				const errorMessage = error instanceof Error ? error.message : 'Download failed';
				setDownloadError(errorMessage);
				setIsDownloading(false);
				setDownloadProgress(null);
				reject(new Error(errorMessage));
			}
		});
	};

	// 预览文件（在新窗口打开）
	const previewFile = (fileId: string) => {
		const url = getFileUrlByFileId(fileId);
		window.open(url, '_blank', 'noopener,noreferrer');
	};

	// 获取文件的 Blob URL（用于预览）
	const getFileBlobUrl = async (fileId: string): Promise<string> => {
		try {
			const blob = await downloadFileWithProgress(fileId);
			return URL.createObjectURL(blob);
		} catch (error) {
			throw new Error('Failed to create blob URL');
		}
	};

	// 复制文件链接到剪贴板
	const copyFileLink = async (fileId: string): Promise<void> => {
		try {
			const url = getFileUrlByFileId(fileId);
			await navigator.clipboard.writeText(url);
		} catch (error) {
			throw new Error('Failed to copy link');
		}
	};

	// 检查文件是否可以预览（基于 MIME 类型）
	const canPreview = (mimeType: string): boolean => {
		const previewableTypes = [
			'image/', // 所有图片
			'application/pdf',
			'text/',
			'video/',
			'audio/',
		];

		return previewableTypes.some((type) => mimeType.startsWith(type));
	};

	// 获取文件类型图标
	const getFileIcon = (mimeType: string): string => {
		if (mimeType.startsWith('image/')) return '🖼️';
		if (mimeType.startsWith('video/')) return '🎥';
		if (mimeType.startsWith('audio/')) return '🎵';
		if (mimeType === 'application/pdf') return '📄';
		if (mimeType.startsWith('text/')) return '📝';
		if (mimeType.includes('word')) return '📝';
		if (mimeType.includes('excel') || mimeType.includes('spreadsheet')) return '📊';
		if (mimeType.includes('powerpoint') || mimeType.includes('presentation')) return '📊';
		if (mimeType.includes('zip') || mimeType.includes('rar') || mimeType.includes('archive')) return '📦';
		return '📁';
	};

	return {
		// 状态
		downloadProgress,
		isDownloading,
		downloadError,

		// 方法
		downloadFile,
		downloadFileWithProgress,
		previewFile,
		getFileBlobUrl,
		copyFileLink,

		// 工具函数
		canPreview,
		getFileIcon,
		getFileUrlByFileId,
		serverUrl,
	};
}