import { getSetting, registerSetting, newMutation, editMutation, Collections, runCallbacks, runCallbacksAsync } from 'meteor/vulcan:core';
import express from 'express';
import Stripe from 'stripe';
import { Picker } from 'meteor/meteorhacks:picker';
import bodyParser from 'body-parser';
import Charges from '../../modules/charges/collection.js';
import Users from 'meteor/vulcan:users';
import { Products } from '../../modules/products.js';

registerSetting('stripe', null, 'Stripe settings');

const stripeSettings = getSetting('stripe');

// initialize Stripe
const keySecret = Meteor.isDevelopment ? stripeSettings.secretKeyTest : stripeSettings.secretKey;
const stripe = new Stripe(keySecret);

const sampleProduct = {
  amount: 10000,
  name: 'My Cool Product',
  description: 'This product is awesome.',
  currency: 'USD',
}

/*

Create new Stripe charge
(returns a promise)

*/
export const performAction = async (args) => {
  
  let collection, document, returnDocument = {};

  const {token, userId, productKey, associatedCollection, associatedId, properties } = args;

  if (!stripeSettings) {
    throw new Error('Please fill in your Stripe settings');
  }

  // if an associated collection name and document id have been provided, 
  // get the associated collection and document
  if (associatedCollection && associatedId) {
    collection = _.findWhere(Collections, {_name: associatedCollection});
    document = collection.findOne(associatedId);
  }

  // get the product from Products (either object or function applied to doc)
  // or default to sample product
  const definedProduct = Products[productKey];
  const product = typeof definedProduct === 'function' ? definedProduct(document) : definedProduct || sampleProduct;

  // get the user performing the transaction
  const user = Users.findOne(userId);

  let customer;

  if (user.stripeCustomerId) {
    // if user has a stripe id already, retrieve customer from Stripe
    customer = await stripe.customers.retrieve(user.stripeCustomerId);
  } else {
    // else create new Stripe customer
    customer = await stripe.customers.create({
      email: token.email,
      source: token.id
    });

    // add stripe customer id to user object
    await editMutation({
      collection: Users,
      documentId: user._id,
      set: {stripeCustomerId: customer.id},
      validate: false
    });
  }

  // create metadata object
  const metadata = {
    userId: userId,
    userName: Users.getDisplayName(user),
    userProfile: Users.getProfileUrl(user, true),
    productKey,
    ...properties
  }

  if (associatedCollection && associatedId) {
    metadata.associatedCollection = associatedCollection;
    metadata.associatedId = associatedId;
  }

  if (product.plan) {
    // if product has a plan, subscribe user to it
    returnDocument = await subscribeUser({user, customer, product, collection, document, metadata, args});
  } else {
    // else, perform charge
    returnDocument = await createCharge({user, customer, product, collection, document, metadata, args});
  }

  return returnDocument;
}

/*

Create one-time charge. 

*/
export const createCharge = async ({user, customer, product, collection, document, metadata, args}) => {
  
  const {token, userId, productKey, associatedId, properties, coupon } = args;

  let amount = product.amount;

  // apply discount coupon and add it to metadata, if there is one
  if (coupon && product.coupons && product.coupons[coupon]) {
    amount -= product.coupons[coupon];
    metadata.coupon = coupon;
    metadata.discountAmount = product.coupons[coupon];
  }

  // gather charge data
  const chargeData = {
    amount,
    description: product.description,
    currency: product.currency,
    customer: customer.id,
    metadata
  }

  // create Stripe charge
  const charge = await stripe.charges.create(chargeData);

  return processCharge({collection, document, charge, args})

}

/*

Process charge on Vulcan's side

*/
export const processCharge = async ({collection, document, charge, args}) => {
 
  let returnDocument = {};

  const {token, userId, productKey, associatedCollection, associatedId, properties, livemode } = args;

  // create charge document for storing in our own Charges collection
  const chargeDoc = {
    createdAt: new Date(),
    userId,
    type: 'stripe',
    test: !livemode,
    data: charge,
    associatedCollection,
    associatedId,
    properties,
    productKey,
  }

  if (token) {
    chargeDoc.tokenId = token.id;
    chargeDoc.test = !token.livemode; // get livemode from token if provided
    chargeDoc.ip = token.client_ip;
  }
  // insert
  const chargeSaved = newMutation({
    collection: Charges,
    document: chargeDoc, 
    validate: false,
  });

  // if an associated collection and id have been provided, 
  // update the associated document
  if (collection && document) {
    
    // note: assume a single document can have multiple successive charges associated to it
    const chargeIds = document.chargeIds ? [...document.chargeIds, chargeSaved._id] : [chargeSaved._id];

    let modifier = {
      $set: {chargeIds},
      $unset: {}
    }

    // run collection.charge.sync callbacks
    modifier = runCallbacks(`${collection._name}.charge.sync`, modifier, document, chargeDoc);

    returnDocument = await editMutation({
      collection,
      documentId: associatedId,
      set: modifier.$set,
      unset: modifier.$unset,
      validate: false
    });

    returnDocument.__typename = collection.typeName;

  }

  runCallbacksAsync(`${collection._name}.charge.async`, returnDocument, chargeDoc);

  return returnDocument;
}

/*

Create new subscription plan

*/
export const createPlan = async (options) => {
  try {
    await stripe.plans.create(options);
  } catch (error) {
    console.log('// Stripe createPlan error')
    console.log(error)
  }
}

/*

Subscribe a user to a Stripe plan

*/
export const subscribeUser = async ({user, customer, product, collection, document, metadata, args }) => {

  console.log('////////////// subscribeUser')
  console.log(product)

  try {
    const subscription = await stripe.subscriptions.create({
      customer: customer.id,
      items: [
        { plan: product.plan },
      ],
      metadata,
    });
    console.log(subscription)
  } catch (error) {
    console.log('// Stripe subscribeUser error')
    console.log(error)
  }
}


/*

Webhooks with Picker

*/

// const app = express()


// app.post('/stripe', function(req, res) {
//   // Retrieve the request's body and parse it as JSON
//   console.log('////////////// stripe webhook')

//   var event_json = JSON.parse(req.body);

//   console.log(event_json)

//   res.send(200);
// });

Picker.middleware(bodyParser.json());

Picker.route('/stripe', async function(params, req, res, next) {

  console.log('////////////// stripe webhook')

  const body = req.body;


   // Retrieve the request's body and parse it as JSON
   switch (body.type) {

    case 'charge.succeeded':

      console.log('////// charge body')
      console.log(body)

      const charge = body.data.object;

      try {

        // look up corresponding invoice
        const invoice = await stripe.invoices.retrieve(body.data.object.invoice);
        console.log('////// invoice')

        // look up corresponding subscription
        const subscription = await stripe.subscriptions.retrieve(invoice.subscription);
        console.log('////// subscription')
        console.log(subscription)

        const { userId, productKey, associatedCollection, associatedId } = subscription.metadata;

        if (associatedCollection && associatedId) {
          const collection = _.findWhere(Collections, {_name: associatedCollection});
          const document = collection.findOne(associatedId);

          const args = {
            userId, 
            productKey,
            associatedCollection,
            associatedId,
            livemode: subscription.livemode,
          }

          processCharge({ collection, document, charge, args});

        }      
      } catch (error) {
        console.log('// Stripe webhook error')
        console.log(error)
      }

      break;

   }

  res.statusCode = 200;
  res.end();

});