import { downloadFile, commit, listFiles, RepoType, CommitOperation } from "@huggingface/hub";

interface CommitBody {
    path: string;
    content?: string;
    message?: string;
    lfs?: boolean;
}

export const onRequest = async (context: RouteContext): Promise<Response> => {
    const request = context.request;
    const env = context.env as Env;

    // 从 Authorization header 中获取 token
    const authHeader = request.headers.get('Authorization');
    if (!authHeader || !authHeader.startsWith('Bearer ')) {
        return new Response(JSON.stringify({ error: '未提供有效的授权令牌' }), {
            status: 401,
            headers: { 'Content-Type': 'application/json' }
        });
    }
    const hfToken = authHeader.replace('Bearer ', '');

    console.log('Request URL:', request.url);
    try {
        const url = new URL(request.url);
        const pathParts = url.pathname.split('/').filter(Boolean);

        // 提取路径参数
        const owner = pathParts[2] || url.searchParams.get('owner'); // 仓库所有者
        const repo = pathParts[3] || url.searchParams.get('repo'); // 仓库名称
        const operation = pathParts[4] || url.searchParams.get('op'); // 操作类型: raw, upload, tree, delete
        const ref = pathParts[5] || url.searchParams.get('ref') || 'main';

        if (!owner || !repo) {
            return new Response(JSON.stringify({ error: '缺少仓库所有者或仓库名称' }), {
                status: 400,
                headers: { 'Content-Type': 'application/json' }
            });
        }

        const apiParams = {
            repo: {
                name: `${owner}/${repo}`,
                type: 'dataset' as RepoType
            },
            accessToken: hfToken,
            revision: ref
        };

        // 处理 GET 请求 - 获取文件内容或列出文件
        if (operation === 'raw' && request.method === 'GET') {
            const path = pathParts.length > 6 ? pathParts.slice(6).join('/') : '';
      
            try {
                const response = await downloadFile({
                    ...apiParams,
                    path: path
                });

                if (!response) {
                    return new Response(JSON.stringify({ error: '文件不存在' }), {
                        status: 404,
                        headers: { 'Content-Type': 'application/json' }
                    });
                }
                return response;
            } catch (error: any) {
                return new Response(JSON.stringify({ error: '获取文件失败', details: error.message }), {
                    status: 500,
                    headers: { 'Content-Type': 'application/json' }
                });
            }
        }

        if (operation === 'tree' && request.method === 'GET') {
            const path = pathParts.length > 6 ? pathParts.slice(6).join('/') : '';
            try {
                const cursor = listFiles({
                    ...apiParams,
                    path: path
                });

                const files = [];
                for await (const entry of cursor) {
                    files.push(entry);
                }

                return new Response(JSON.stringify(files), {
                    headers: { 'Content-Type': 'application/json' }
                });
            } catch (error: any) {
                return new Response(JSON.stringify({ error: '列出文件失败', details: error.message }), {
                    status: 500,
                    headers: { 'Content-Type': 'application/json' }
                });
            }
        }

        // 处理 POST 请求 - 上传文件
        if (operation === 'commit' && (request.method === 'POST' || request.method === 'PUT' || request.method === 'DELETE')) {
            const body = await request.json() as CommitBody;

            try {
                let operation: CommitOperation;

                if (request.method === 'DELETE') {
                    operation = {
                        operation: 'delete',
                        path: body.path
                    };
                } else {
                    const content = body.content || '';
                    let blobContent: Blob;

                    if (body.lfs === true && body.content) {
                        const binary = atob(body.content);
                        const bytes = new Uint8Array(binary.length);
                        for (let i = 0; i < binary.length; i++) {
                            bytes[i] = binary.charCodeAt(i);
                        }
                        blobContent = new Blob([bytes]);
                    } else {
                        blobContent = new Blob([content]);
                    }

                    operation = {
                        operation: 'addOrUpdate',
                        path: body.path,
                        content: blobContent
                    };
                }

                const response = await commit({
                    ...apiParams,
                    operations: [operation],
                    title: `${request.method === 'DELETE' ? 'Delete' : 'Update'} ${body.path}`,
                    description: body.message || `Changed via API`
                });

                return new Response(JSON.stringify(response), {
                    status: 200,
                    headers: { 'Content-Type': 'application/json' }
                });
            } catch (error: any) {
                return new Response(JSON.stringify({ error: '提交更改失败', details: error.message }), {
                    status: 500,
                    headers: { 'Content-Type': 'application/json' }
                });
            }
        }

        // 不支持的请求方法或路径
        return new Response(JSON.stringify({ error: '不支持的请求方法或路径' }), {
            status: 400,
            headers: { 'Content-Type': 'application/json' }
        });
    } catch (error: any) {
        console.error('Error:', error);
        return new Response(JSON.stringify({ error: '服务器内部错误', details: error.message }), {
            status: 500,
            headers: { 'Content-Type': 'application/json' }
        });
    }
};