package com.snp.batch.global.config;

import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.reactive.function.client.WebClient;

/**
 * Maritime API WebClient 설정
 *
 * 목적:
 * - Maritime API 서버에 대한 WebClient Bean 등록
 * - 동일한 API 서버를 사용하는 여러 Job에서 재사용
 * - 설정 변경 시 한 곳에서만 수정
 *
 * 사용 Job:
 * - shipDataImportJob: IMO 번호 조회
 * - shipDetailImportJob: 선박 상세 정보 조회
 *
 * 다른 API 서버 추가 시:
 * - 새로운 Config 클래스 생성 (예: OtherApiWebClientConfig)
 * - Bean 이름을 다르게 지정 (예: @Bean(name = "otherApiWebClient"))
 */
@Slf4j
@Configuration
public class MaritimeApiWebClientConfig {

    @Value("${app.batch.ship-api.url}")
    private String maritimeApiUrl;

    @Value("${app.batch.ais-api.url}")
    private String maritimeAisApiUrl;

    @Value("${app.batch.webservice-api.url}")
    private String maritimeServiceApiUrl;


    @Value("${app.batch.ship-api.username}")
    private String maritimeApiUsername;

    @Value("${app.batch.ship-api.password}")
    private String maritimeApiPassword;

    /**
     * Maritime API용 WebClient Bean
     *
     * 설정:
     * - Base URL: Maritime API 서버 주소
     * - 인증: Basic Authentication
     * - 버퍼: 20MB (대용량 응답 처리)
     *
     * @return Maritime API WebClient
     */
    @Bean(name = "maritimeApiWebClient")
    public WebClient maritimeApiWebClient() {
        log.info("========================================");
        log.info("Maritime API WebClient 생성");
        log.info("Base URL: {}", maritimeApiUrl);
        log.info("========================================");

        return WebClient.builder()
                .baseUrl(maritimeApiUrl)
                .defaultHeaders(headers -> headers.setBasicAuth(maritimeApiUsername, maritimeApiPassword))
                .codecs(configurer -> configurer
                        .defaultCodecs()
                        .maxInMemorySize(100 * 1024 * 1024)) // 30MB 버퍼
                .build();
    }

    @Bean(name = "maritimeAisApiWebClient")
    public WebClient maritimeAisApiWebClient(){
        log.info("========================================");
        log.info("Maritime AIS API WebClient 생성");
        log.info("Base URL: {}", maritimeAisApiUrl);
        log.info("========================================");

        return WebClient.builder()
                .baseUrl(maritimeAisApiUrl)
                .defaultHeaders(headers -> headers.setBasicAuth(maritimeApiUsername, maritimeApiPassword))
                .codecs(configurer -> configurer
                        .defaultCodecs()
                        .maxInMemorySize(50 * 1024 * 1024)) // 50MB 버퍼 (AIS GetTargets 응답 ~20MB+)
                .build();
    }

    @Bean(name = "maritimeServiceApiWebClient")
    public WebClient maritimeServiceApiWebClient(){
        log.info("========================================");
        log.info("Maritime AIS API WebClient 생성");
        log.info("Base URL: {}", maritimeServiceApiUrl);
        log.info("========================================");

        return WebClient.builder()
                .baseUrl(maritimeServiceApiUrl)
                .defaultHeaders(headers -> headers.setBasicAuth(maritimeApiUsername, maritimeApiPassword))
                .codecs(configurer -> configurer
                        .defaultCodecs()
                        .maxInMemorySize(100 * 1024 * 1024)) // 100MB 버퍼
                .build();
    }
}


/**
 * ========================================
 * 다른 API 서버 추가 예시
 * ========================================
 *
 * 1. 새로운 Config 클래스 생성:
 *
 * @Configuration
 * public class ExternalApiWebClientConfig {
 *
 *     @Bean(name = "externalApiWebClient")
 *     public WebClient externalApiWebClient(
 *             @Value("${app.batch.external-api.url}") String url,
 *             @Value("${app.batch.external-api.token}") String token) {
 *
 *         return WebClient.builder()
 *                 .baseUrl(url)
 *                 .defaultHeader("Authorization", "Bearer " + token)
 *                 .build();
 *     }
 * }
 *
 * 2. JobConfig에서 사용:
 *
 * public ExternalJobConfig(
 *         ...,
 *         @Qualifier("externalApiWebClient") WebClient externalApiWebClient) {
 *     this.webClient = externalApiWebClient;
 * }
 *
 * 3. application.yml에 설정 추가:
 *
 * app:
 *   batch:
 *     external-api:
 *       url: https://external-api.example.com
 *       token: ${EXTERNAL_API_TOKEN}
 */