var express = require('express');
var router = express.Router();
var debug = require('debug')('admin')

const Sequelize = require('sequelize')
const Op = Sequelize.Op;

const { v4: uuidv4 } = require('uuid');

// usage:  GET '/users'
//
// Returns: 
//    { users: <list of users }
router.get(
  "/users",
  auth,
  ah(async (req, res) => {
    var users = await knex
      .select('username', 'email', 'sms', 'verified', knex.raw('LEFT(createdAt,10) as created_at'))
      .from('users')
      
    // Alternative Sequelize query syntax
    //   await db.User.findAll({
    //   attributes: ['username', 'email', 'sms', 'verified', 'createdAt']
    // })

    debug('users: ' + JSON.stringify(users))
    return res.send({users: users})
  })
);

// usage:  GET '/referrals'
//
// Returns: 
//    { referrals: <list of referral tokens> }
router.get(
  "/referrals",
  auth,
  ah(async (req, res) => {
    var referrals = await knex
      .select(
        'token', 
        'users.username as user', 
        'sponsor.username as sponsor', 
        knex.raw('LEFT(created_at, 10) as created_at'), 
        'referrals.status'
      )
      .from('referrals')
      .leftJoin('users', 'users.id', 'referrals.user_id')
      .leftJoin('users as sponsor', 'sponsor.id', 'referrals.sponsor_id')

    // Alternative Sequelize query syntax (returns sub-tables as hash)
    // var referrals = await db.Referral.findAll({
    //   include: [ 
    //     {model: db.User, as: 'user', attributes: [['username', 'user']]},
    //     {model: db.User, as: 'sponsor', attributes: [['username', 'sponsor']]}
    //   ]
    // })


    debug('Referrals: ' + JSON.stringify(referrals))
    return res.send({referrals: referrals})
  })
);

// usage:  GET '/accounts'
//
// Returns: 
//    { referrals: <list of referral tokens> }
router.get(
  "/accounts",
  auth,
  ah(async (req, res) => {
    const {nonZero} = req.query

    var accounts = knex
      .select('username', 'accounts.id as account_id', 'ticker', 'balance', knex.raw('LEFT(accounts.createdAt, 10) as created_at'))
      .from('accounts')
      .leftJoin('users', 'users.id', 'accounts.user_id')

    if (nonZero) {
      accounts = accounts
        .where('balance', '>', 0)
    }
    var found = await accounts

    debug('accounts: ' + JSON.stringify(found))
    return res.send({accounts: found})
  })
);

// usage:  GET '/user/transactions'
//
// Returns: 
//    { users: [
//         <user attributes>, 
//         Invoices: 
//           <invoice attributes>, 
//         Payments: 
//           <invoice attributes>, 
//         Orders: 
//           <invoice attributes>, 
//       ], ...
//    }
router.get(
  "/user_transactions",
  auth,
  ah(async (req, res) => {
    var transactions = knex
      .select(
        'username',
        'email',
        knex.raw('COUNT(invoices.id) as invoices'),
        knex.raw('COUNT(payments.id) as payments'),
        knex.raw('COUNT(orders.id) as orders')
      )
      .from('users')
      .leftJoin('accounts', 'users.id', 'accounts.user_id')
      .leftJoin('invoices', 'invoices.account_id', 'accounts.id')
      .leftJoin('payments', 'payments.account_id', 'accounts.id')
      .leftJoin('orders', 'orders.user_id', 'users.id')
      .groupBy('users.id')

    // Alternative Sequelize query syntax (returns sub-tables as hash)
    // var referrals = await db.Referral.findAll({
    //   include: [ 
    //     {model: db.User, as: 'user', attributes: [['username', 'user']]},
    //     {model: db.User, as: 'sponsor', attributes: [['username', 'sponsor']]}
    //   ]
    // })

    // var transactions = await db.User.findAll({
    //   include: [
    //     { model: db.Invoice, as: 'invoices' },
    //     { model: db.Payment, as: 'payments' },
    //     { model: db.Order, as: 'orders'}
    //   ]
    // })

    var found = await transactions
    debug('transactions: ' + JSON.stringify(found))
    return res.send({transactions: found})
  })
);

// usage:  GET '/user_kyc'
//
// Returns: 
//    { 
//  users: [
//    <list of user attributes>,
//    kyc: <list of kyc attributes for this user>
//  ] 
router.get(
  "/user_kyc",
  auth,
  ah(async (req, res) => {
    
    var kyc = { details: 'Not yet defined' }
    debug('kyc: ' + JSON.stringify(kyc))
    return res.send({users: kyc})
  })
);

module.exports = router;