getting suggested amount and getting charities

app/controllers/donor/index.js

@@ -0,0 +1,5 @@
+module.exports = {
+	donor: require('./donor.controller'),
+	grant: require('./grant.controller'),
+	organization: require('./organization.controller')
+};

app/controllers/donor/organization.controller.js

@@ -0,0 +1,53 @@
+const db = require('../../config/db.config.js'),
+	errorMaker = require('../../helpers/error.maker');
+
+const { Grant, Cause, Region, Organization } = db;
+
+const log10 = val => {
+	return Math.log(val) / Math.log(10);
+};
+
+// GET suggested organizations based on chosen causes + regions
+exports.findSuggested = (req, res, next) => {
+	const { amount, causes, regions } = req.body;
+
+	// formula for max amount of organizations to choose
+	const max_orgs = Math.floor(1.5 * log10(amount));
+
+	const QUERY =
+		'SELECT * from organizations ' +
+		'WHERE primary_cause IN (:causes) and primary_region IN (:regions) ' +
+		'LIMIT :max_orgs';
+	db.sequelize
+		.query(QUERY, {
+			replacements: { causes, regions, max_orgs },
+			type: db.Sequelize.QueryTypes.SELECT
+		})
+		.then(orgs => {
+			res.status(200).json({
+				orgs,
+				num_items: orgs.length,
+				max_orgs,
+				distribution: amount / orgs.length
+			});
+		})
+		.catch(error => next(error));
+};
+
+// GET min and optimal amounts for the chosen causes + regions
+exports.findAmounts = (req, res, next) => {
+	const { num_causes, num_regions } = req.body;
+
+	const feature_factor = parseInt(num_causes) + parseFloat(num_regions / 2);
+
+	// calculate min amount for chosen causes and regions
+	const min_amount = Math.ceil(feature_factor * 15);
+
+	// calculate optimal for chosen causes and regions
+	const optimal_amount = Math.ceil(Math.pow(5, feature_factor));
+
+	res.status(200).json({
+		min_amount,
+		optimal_amount
+	});
+};

app/routes/donor.route.js

@@ -2,27 +2,41 @@ const express = require('express'),
 	router = express.Router(),
 	checkAuth = require('../middleware/check-auth');
 
-const donor = require('../controllers/donor/donor.controller.js');
-const grant = require('../controllers/donor/grant.controller.js');
+const controllers = require('../controllers/donor');
 
-// Signup route
-router.post('/', donor.create);
+// POST Signup route
+router.post('/', controllers.donor.create);
 
-// Retrieve all Donors
-router.get('/', checkAuth, donor.findAll);
+// GET Retrieve all Donors
+router.get('/', checkAuth, controllers.donor.findAll);
 
-// Retrieve grants with causes and regions and charities details by donor_id
-router.get('/grants/:donor_id', checkAuth, grant.findByDonorId);
+// GET Retrieve grants with causes and regions and charities details by donor_id
+router.get('/grants/:donor_id', checkAuth, controllers.grant.findByDonorId);
 
-/** Create grants with following body:
+/** POST Create grants with following body:
  * - list of id's of selected causes and regions
  * - FINAL list of id's of selected organizations
  * - donor_id
  * */
-router.post('/grants/:donor_id', checkAuth, grant.create);
+router.post('/grants/:donor_id', checkAuth, controllers.grant.create);
 
-// Delete a grant of a donor
-router.delete('/grants/:grant_id', checkAuth, grant.delete);
+// DELECT a grant of a donor
+router.delete('/grants/:grant_id', checkAuth, controllers.grant.delete);
+
+// GET suggested organizations to distribute to
+// running "the algorithm"
+router.get(
+	'/organizations/',
+	checkAuth,
+	controllers.organization.findSuggested
+);
+
+// GET min and optimal amount to choose
+router.get(
+	'/organizations/amounts',
+	checkAuth,
+	controllers.organization.findAmounts
+);
 
 // // Retrieve a single Donor by Id
 // router.get('/:donor_id', donor.findById);