stocks-be/src/main/java/com/danielbohry/stocks/service/ExchangeService.java

package com.danielbohry.stocks.service;

import com.danielbohry.stocks.client.ExchangeRateClient;
import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
import com.fasterxml.jackson.annotation.JsonProperty;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.cache.annotation.Cacheable;
import org.springframework.stereotype.Service;

import java.math.BigDecimal;
import java.util.Map;

@Slf4j
@Service
public class ExchangeService {

    private final ExchangeRateClient client;
    private final String key;

    public ExchangeService(ExchangeRateClient client, @Value("${clients.exchange.key}") String key) {
        this.client = client;
        this.key = key;
    }

    @Cacheable(value = "exchangeRates", key = "#currency")
    public ExchangeRateResponse getCurrentRate(String currency) {
        return client.getRate(currency, key);
    }

    @Data
    @AllArgsConstructor
    @NoArgsConstructor
    @JsonIgnoreProperties(ignoreUnknown = true)
    public static class ExchangeRateResponse {
        @JsonProperty("result")
        private String result;
        @JsonProperty("base_code")
        private String code;
        @JsonProperty("conversion_rates")
        private Map<String, BigDecimal> conversionRates;
    }

}