/*
 * Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
 * SPDX-License-Identifier: MIT-0
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of this
 * software and associated documentation files (the "Software"), to deal in the Software
 * without restriction, including without limitation the rights to use, copy, modify,
 * merge, publish, distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
 * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
 * PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
 * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
package com.amazon.sample.appconfig.quarkus;

import org.eclipse.microprofile.config.inject.ConfigProperty;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.inject.Provider;
import javax.ws.rs.Consumes;
import javax.ws.rs.POST;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.Response;

import static java.lang.Math.pow;

@Path("loan")
@Produces(MediaType.APPLICATION_JSON)
@Consumes(MediaType.APPLICATION_JSON)
public class LoanResource {

  private static final Logger LOGGER = LoggerFactory.getLogger(LoanResource.class);

  @ConfigProperty(name = "interestRate", defaultValue = "0.05")
  Provider<Double> interestRate;

  @Path("annuity")
  @POST
  public Response calculate(LoanCalculationRequest req) {

    var terms = req.getDurationInYears();
    var amount = req.getAmountInEur();
    var iRate = interestRate.get();

    LOGGER.info("Using interestRate = {}", iRate);

    var annuity =
        amount * (pow(1 + iRate, terms) * iRate / (pow(1 + iRate, terms) - 1));
    var res = new LoanCalculationResponse();
    res.setAnnuity(annuity);

    return Response.ok().entity(res).build();
  }
}