const http = require('http');
const fs = require('fs');
const Mime = require('./libs/Mime');//這個是處理content-type的庫

let users = [
    {
        name: 'neal',
        gender: '女',
        t: ["shcool","hospital"]
    },
    {
        name: 'shy',
        gender: '男',
        t: ['top']
    },
    {
        name: 'faker',
        gender: '男',
        t: ['wc',"micky happy house"]
    }
];

const app = http.createServer( (req, res) => {

    res.writeHead(200, http.STATUS_CODES[200], {
        'Content-Type': 'text/html;charset=utf-8'
    });
    let content = '';
    /**
     * 把動態與靜態資源進行區分：url
     *  約定：以 /static 開頭的都算是靜態，我約定把靜態檔案都放在了 /static 對應的目錄下
     */
    // console.log( req.url.startsWith('/static'))
    if ( req.url.startsWith('/static') ) {
        staticSend(__dirname + req.url);
    } else {
        //動態
        switch(req.url) {
            case '/user':
                res.writeHead(200, http.STATUS_CODES[200], {
                    'Content-Type': 'application/json;charset=utf-8'
                });
                let data = users.map( user => user.name );
                console.log(data);
                let data1=JSON.stringify(data)
                console.log(data1)
                res.end(data1);
                break;
            case '/getbaidu':
                const r = http.request({
                    host: 'www.baidu.com'
                }, function(badiuRes) {
                    let data = '';
                    badiuRes.on('data', (chunk) => {
                        data += chunk.toString();
                        //實際情況下是不能進行字串處理的
                        //因為傳過來的可能是視訊，圖片等
                        //因此要對buffer進行處理
                    });
                    badiuRes.on('end', () => {
                        // console.log('響應中已無資料。');
                        res.end(data);
                    });
                });
                r.end();
                break;
        }
    }
    function staticSend(filename, headers={'Content-Type': 'text/html;charset=utf-8'}, statusCode=200) {

        if (fs.existsSync(filename)) {
            let ext = filename.substring( filename.lastIndexOf('.') + 1 );
            if (!ext) {
                ext = 'txt';
            }
            headers['Content-Type'] = Mime.getType(ext);
            res.writeHead(statusCode, http.STATUS_CODES[statusCode], headers);
            content = fs.readFileSync(filename);
            res.end(content);
        } else {
            staticSend(__dirname + '/static/404.html', {
                'Content-Type': 'text/html;charset=utf-8'
            }, 404);
        }
    }
} );
app.listen(80, () => {
    console.log('伺服器啟動成功了');
});