app.js

const mongoose = require("mongoose");
const express = require("express");
const bodyParser = require("body-parser");
const passport = require("passport");
const db = require("./config/keys").mongoURI;
const users = require("./routes/api/users");
const playlists = require("./routes/api/playlists");
const songs = require('./routes/api/songs');
const follows = require('./routes/api/follows');
const answers = require('./routes/api/answers');
const posts = require('./routes/api/posts');
const seedDb = require('./seeds');

require("./config/passport")(passport);

const app = express();

const path = require('path');

if (process.env.NODE_ENV === 'production') {
  app.use(express.static('frontend/build'));
  app.get('/', (req, res) => {
    res.sendFile(path.resolve(__dirname, 'frontend', 'build', 'index.html'));
  })
}

const questions = require("./routes/api/questions");


let gfs;


mongoose
  .connect(db, { useNewUrlParser: true })
  .then(() =>{
      // seedDb();
      console.log("Connected to MongoDB successfully")
    })
  .catch((err) => console.log(err));

const conn = mongoose.connection;
conn.once("open", function () {
    gfs = new mongoose.mongo.GridFSBucket(conn.db, {
      bucketName: 'photos'
    });
});

// allows for postman tests
app.use(bodyParser.urlencoded({ extended: false }));
// tells app to only respond to json
app.use(bodyParser.json());


// to display single file object
app.get("/api/file/:filename", (req, res) => {
  gfs.files.findOne({ filename: req.params.filename }, (err, file) => {
    if (!file || file.length === 0) {
      return res.status(404).json({
        err: 'No file exists'
      });
    }

    return res.json(file);
  })
});

// to render the image 
app.get("/api/image/:filename", (req, res) => {
  gfs.find({ filename: req.params.filename }).toArray((err, files) => {
    if (!files[0] || files.length === 0) {
        return res.status(200).json({
            success: false,
            message: 'No files available',
        });
    }

    if (files[0].contentType === 'image/jpeg' || files[0].contentType === 'image/png' || files[0].contentType === 'image/svg+xml') {
        // render image to browser
        gfs.openDownloadStreamByName(req.params.filename).pipe(res);
    } else {
        res.status(404).json({
            err: 'Not an image',
        });
    }
  });
});


app.use(passport.initialize());
// Routes
app.use("/api/spotify/songs", require("./routes/api/spotify/songs"));
app.use("/api/spotify/login", require("./routes/api/spotify/login"))
app.use("/api/spotify/playlists", require("./routes/api/spotify/playlists"))
app.use("/api/users", users);
app.use('/api/songs', songs);
app.use('/api/answers', answers);
app.use('/api/playlists', playlists);
app.use('/api/questions', questions);
app.use('/api/follows', follows);
app.use('/api/posts', posts);


const port = process.env.PORT || 5000;

app.listen(port, () => console.log(`Server is running on port ${port}`));