const { app } = require('@azure/functions');

app.http('simple-interest', {
    methods: ['GET', 'POST'],
    authLevel: 'anonymous',
    handler: async (request, context) => {
        //Try parsing query strings as nums
        const principal = parseFloat(request.query.get('principal'));
        const rate = parseFloat(request.query.get('rate'));
        const term = parseFloat(request.query.get('term'));

        //Output values to console for debugging
        context.log(principal);
        context.log(rate);
        context.log(term);

        //If any of the query strings aren't nums then return 400 error
        if ([principal, rate, term].some(isNaN)) {
            //Return 400 status
            return {
                status: 400,
                body: "Please supply principal, rate, and term in the query string"
            };
        }

        //Calculate the interest
        const interest = principal * rate * term;

        //Return 200 status
        return { body: interest };
    }
});