package com.doumee.config;

import com.doumee.core.exception.BusinessException;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.io.buffer.DataBufferFactory;
import org.springframework.core.io.buffer.DataBufferUtils;
import org.springframework.http.HttpStatus;
import org.springframework.http.MediaType;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

import java.nio.charset.StandardCharsets;

public class GlobalErrorFilter implements GlobalFilter {

    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        return chain.filter(exchange).onErrorResume(throwable -> {
            ServerHttpResponse response = exchange.getResponse();
            response.setStatusCode(HttpStatus.INTERNAL_SERVER_ERROR);

            response.getHeaders().setContentType(MediaType.APPLICATION_JSON);

            String errorMessage = "{\"message\": \"" + throwable.getMessage() + "\"}";
            byte[] bytes = errorMessage.getBytes(StandardCharsets.UTF_8);
            DataBufferFactory bufferFactory = response.bufferFactory();
            response.setStatusCode(HttpStatus.INTERNAL_SERVER_ERROR);
            response.getHeaders().setContentType(MediaType.APPLICATION_JSON);
            return response.writeWith(Mono.just(bufferFactory.wrap(bytes)));
        });
    }
}