'use client';

import { useState, useRef, useCallback } from 'react';
import * as tus from 'tus-js-client';
import { useAuth } from '@/components/providers/auth-provider';

/**
 * 上传状态
 */
export interface TusUploadState {
    /** 当前上传的文件 */
    file: File | null;
    /** 上传进度 (0-100) */
    progress: number;
    /** 上传状态 */
    status: 'idle' | 'uploading' | 'success' | 'error' | 'paused';
    /** 错误信息 */
    error?: string;
    /** 成功后的文件URL */
    uploadUrl?: string;
    /** 已上传的字节数 */
    bytesUploaded?: number;
    /** 文件总字节数 */
    bytesTotal?: number;
}

/**
 * 上传元数据接口
 */
export interface UploadMetadata {
    /** 用户ID */
    authorId?: string;
    /** 父目录ID */
    parentId?: string;
    /** 组织ID */
    organizationId?: string;
    /** 文件描述 */
    description?: string;
    /** 自定义标签 */
    tags?: string[];
    /** 自定义元数据 */
    [key: string]: any;
}

/**
 * TUS 上传钩子
 */
export function useTusUpload(defaultMetadata: UploadMetadata = {}) {
    const { user } = useAuth();
    const [state, setState] = useState<TusUploadState>({
        file: null,
        progress: 0,
        status: 'idle',
    });

    const uploadRef = useRef<tus.Upload | null>(null);
    const retryDelays = [1000, 3000, 5000]; // 重试延迟

    /**
     * 构建TUS元数据
     */
    const buildTusMetadata = useCallback((file: File, customMetadata: UploadMetadata = {}) => {
        const metadata: Record<string, string> = {
            filename: file.name,
            filetype: file.type || 'application/octet-stream',
            filesize: file.size.toString(),
        };

        // 添加用户信息
        if (user?.id) {
            metadata.authorId = user.id;
        }
        if (user?.organizationId) {
            metadata.organizationId = user.organizationId;
        }

        // 添加默认元数据
        Object.entries(defaultMetadata).forEach(([key, value]) => {
            if (value !== undefined && value !== null) {
                if (typeof value === 'object') {
                    metadata[key] = JSON.stringify(value);
                } else {
                    metadata[key] = String(value);
                }
            }
        });

        // 添加自定义元数据
        Object.entries(customMetadata).forEach(([key, value]) => {
            if (value !== undefined && value !== null) {
                if (typeof value === 'object') {
                    metadata[key] = JSON.stringify(value);
                } else {
                    metadata[key] = String(value);
                }
            }
        });

        return metadata;
    }, [user, defaultMetadata]);

    /**
     * 开始上传文件
     */
    const uploadFile = useCallback((file: File, metadata: UploadMetadata = {}) => {
        // 构建元数据
        const tusMetadata = buildTusMetadata(file, metadata);

        // 创建上传实例
        const upload = new tus.Upload(file, {
            endpoint: `${process.env.NEXT_PUBLIC_API_URL || 'http://localhost:3000'}/files/`,
            retryDelays,
            metadata: tusMetadata,
            chunkSize: 1024 * 1024, // 1MB 分块大小
            onError: (error: Error) => {
                console.error('上传失败:', error);
                console.error('错误详情:', error);
                setState((prev) => ({
                    ...prev,
                    status: 'error',
                    error: error.message,
                }));
            },
            onProgress: (bytesUploaded: number, bytesTotal: number) => {
                const progress = Math.round((bytesUploaded / bytesTotal) * 100);
                setState((prev) => ({
                    ...prev,
                    progress,
                    bytesUploaded,
                    bytesTotal,
                }));
            },
            onSuccess: () => {
                setState((prev) => ({
                    ...prev,
                    status: 'success',
                    uploadUrl: upload.url || undefined,
                    progress: 100,
                }));
            },
            onShouldRetry: (err: Error, retryAttempt: number) => {
                // TUS错误对象可能包含额外属性
                const tusError = err as any;
                const status = tusError.originalResponse ? tusError.originalResponse.getStatus() : 0;

                // 不重试认证错误、权限错误等
                if (status === 401 || status === 403 || status === 413) {
                    return false;
                }

                // 如果超过最大重试次数，不再重试
                if (retryAttempt >= retryDelays.length) {
                    return false;
                }

                return true;
            },
        });

        // 保存上传实例引用
        uploadRef.current = upload;

        // 设置初始状态
        setState({
            file,
            progress: 0,
            status: 'uploading',
            error: undefined,
            uploadUrl: undefined,
            bytesUploaded: 0,
            bytesTotal: file.size,
        });

        // 开始上传
        upload.start();
    }, [buildTusMetadata, retryDelays]);

    /**
     * 批量上传文件
     */
    const uploadFiles = useCallback(async (files: File[], metadata: UploadMetadata = {}) => {
        const results: Array<{ file: File; success: boolean; error?: string; uploadUrl?: string }> = [];

        for (const file of files) {
            try {
                await new Promise<void>((resolve, reject) => {
                    const tusMetadata = buildTusMetadata(file, metadata);

                    const upload = new tus.Upload(file, {
                        endpoint: `${process.env.NEXT_PUBLIC_API_URL || 'http://localhost:3000'}/files/`,
                        retryDelays,
                        metadata: tusMetadata,
                        onError: reject,
                        onSuccess: () => {
                            results.push({
                                file,
                                success: true,
                                uploadUrl: upload.url || undefined,
                            });
                            resolve();
                        },
                        onShouldRetry: (err: Error, retryAttempt: number) => {
                            const tusError = err as any;
                            const status = tusError.originalResponse ? tusError.originalResponse.getStatus() : 0;

                            if (status === 401 || status === 403 || status === 413) {
                                return false;
                            }

                            if (retryAttempt >= retryDelays.length) {
                                return false;
                            }

                            return true;
                        },
                    });

                    upload.start();
                });
            } catch (error) {
                results.push({
                    file,
                    success: false,
                    error: error instanceof Error ? error.message : '上传失败',
                });
            }
        }

        return results;
    }, [buildTusMetadata, retryDelays]);

    /**
     * 暂停上传
     */
    const pauseUpload = useCallback(() => {
        if (uploadRef.current) {
            uploadRef.current.abort();
            setState((prev) => ({
                ...prev,
                status: 'paused',
            }));
        }
    }, []);

    /**
     * 恢复上传
     */
    const resumeUpload = useCallback(() => {
        if (uploadRef.current) {
            uploadRef.current.start();
            setState((prev) => ({
                ...prev,
                status: 'uploading',
                error: undefined,
            }));
        }
    }, []);

    /**
     * 取消上传
     */
    const cancelUpload = useCallback(() => {
        if (uploadRef.current) {
            uploadRef.current.abort();
            uploadRef.current = null;
        }
        setState({
            file: null,
            progress: 0,
            status: 'idle',
        });
    }, []);

    /**
     * 重置状态
     */
    const reset = useCallback(() => {
        setState({
            file: null,
            progress: 0,
            status: 'idle',
        });
    }, []);

    return {
        state,
        uploadFile,
        uploadFiles,
        pauseUpload,
        resumeUpload,
        cancelUpload,
        reset,
        // 便利方法
        isUploading: state.status === 'uploading',
        isSuccess: state.status === 'success',
        isError: state.status === 'error',
        isPaused: state.status === 'paused',
        canResume: state.status === 'paused',
        canPause: state.status === 'uploading',
    };
}