const Koa = require('koa');
const mongoose = require('@south-paw/koa-mongoose');

const app = new Koa();

// middleware config
const config = {
  host: 'localhost',
  port: '27017',
  user: '',
  pass: '',
  db: 'test',
  mongoOptions: {
    // these are the default middleware options, see https://mongoosejs.com/docs/connections.html#options
    useNewUrlParser: true,
    useCreateIndex: true,
    useUnifiedTopology: true,
    reconnectTries: Number.MAX_SAFE_INTEGER, // Never stop trying to reconnect
    reconnectInterval: 500, // Reconnect every 500ms
    poolSize: 10, // Maintain up to 10 socket connections
    bufferMaxEntries: 0, // If not connected, return errors immediately rather than waiting for reconnect
    connectTimeoutMS: 10000, // Give up initial connection after 10 seconds
    socketTimeoutMS: 45000, // Close sockets after 45 seconds of inactivity
  },
  schemas: {
    // schemas recieve the middleware's mongoose instance, see https://mongoosejs.com/docs/schematypes.html
    users: ({ Schema }) =>
      new Schema(
        {
          name: { type: String },
          pets: [Schema.Types.ObjectId],
        },
        { collection: 'users' },
      ),
    pets: ({ Schema }) =>
      new Schema(
        {
          type: { type: String },
          name: { type: String },
        },
        { collection: 'pets' },
      ),
  },
  events: {
    // see https://mongoosejs.com/docs/api.html#connection_Connection-readyState
    error: () => console.error('mongoose: error'),
    connected: () => console.log('mongoose: connected'),
    connecting: () => console.log('mongoose: connecting'),
    disconnecting: () => console.log('mongoose: disconnecting'),
    disconnected: () => console.log('mongoose: disconnected'),
  },
  useDefaultErrorHandler: false, // enable or disable the default error handler
};

// apply the middleware
app.use(mongoose(config));

// and you can now use the middleware via the ctx with
// `ctx.model(modelName)` and `ctx.document(modelName, document)`