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package cn.jiguang.sdk.codec;

import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.datatype.jsr310.JavaTimeModule;
import feign.FeignException;
import feign.Response;
import feign.codec.DecodeException;
import feign.codec.Decoder;
import feign.jackson.JacksonDecoder;

import java.io.IOException;
import java.lang.reflect.Type;

public class ApiDecoder implements Decoder {

    private final JacksonDecoder jacksonDecoder;

    public ApiDecoder() {
        ObjectMapper objectMapper = new ObjectMapper();
        objectMapper.registerModule(new JavaTimeModule());
        jacksonDecoder = new JacksonDecoder(objectMapper);
    }

    @Override
    public Object decode(Response response, Type type) throws IOException, DecodeException, FeignException {
        String contentType = response.headers().get("Content-Type").stream().findFirst().orElse(null);
        if (contentType == null) {
            return null;
        }
        if (!contentType.startsWith("application/json")) {
            return null;
        }
        return jacksonDecoder.decode(response, type);
    }

}