var actions = require("./action/index");

module.exports = function(request, response) {
    var pathname = request.pathname;
    
    if(request.method === 'OPTIONS') {
        response.end();
    }else if(actions.hasOwnProperty(pathname)) {
        if(pathname === '/file/upload') {
            response.writeHead(200, {
                "Content-Type": "application/json;charset=UTF-8"
            });

            var pr = actions[pathname](request, response);
            pr.then(data => {
                response.write(JSON.stringify({
                    code: 200,
                    success: true,
                    data: data
                }));
                response.end();
            }).catch((err) => {
                response.write(JSON.stringify({
                    code: 200,
                    success: false,
                    data: null,
                    msg: err
                }));
                response.end();
            });
        }else if(pathname === '/file/download') {
            var filename = request.query.filename;
            var arr = [];
            
            var readStream = actions[pathname](request, response);
            
            readStream.on('data', chunk => {
                arr.push(Buffer.from(chunk));
            });

            readStream.on('error', err => {
                response.writeHead(200, {
                    "Content-Type": "application/json;charset=UTF-8"
                });
                response.write(JSON.stringify({
                    code: 200,
                    success: false,
                    msg: err,
                    data: null
                }));
                response.end();
            });

            readStream.on('end', () => {
                response.writeHead(200, {
                    "Content-Type": "application/octet-stream",
                    'Content-Disposition': 'attachment; filename=' + encodeURI(filename)
                });
                response.write(Buffer.from(...arr), 'binary');//文档内容以二进制的格式写到response的输出流
                response.end();
            })
        }else {
            response.writeHead(200, {
                "Content-Type": "application/json;charset=UTF-8"
            });

            response.write(JSON.stringify({
                code: 200,
                success: true,
                data: actions[pathname](request, response)
            }));
            response.end();
        }
    }else {
        response.write(JSON.stringify({
            code: 200,
            success: false,
            msg: 'no matches.',
            data: null
        }));
        response.end();
    }
}