package jnpf.fileStorage;

import jakarta.annotation.PostConstruct;
import jakarta.annotation.PreDestroy;
import lombok.RequiredArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.dromara.x.file.storage.core.FileStorageService;
import org.dromara.x.file.storage.core.platform.FileStorage;
import org.dromara.x.file.storage.core.platform.MinioFileStorage;
import org.dromara.x.file.storage.core.platform.MinioFileStorageClientFactory;
import org.springframework.stereotype.Component;

import java.util.ArrayList;
import java.util.List;

@Slf4j
@Component
@RequiredArgsConstructor
public class SeaweedFsStorageRegistrar {
    private final SeaweedFsStorageProperties properties;
    private final FileStorageService fileStorageService;
    private final List<MinioFileStorage> registeredStorages = new ArrayList<>();

    @PostConstruct
    void register() {
        for (SeaweedFsStorageProperties.SeaweedFsConfig config : properties.getSeaweedfs()) {
            if (!Boolean.TRUE.equals(config.getEnableStorage())) {
                continue;
            }
            validate(config);
            synchronized (fileStorageService.getFileStorageList()) {
                ensureUnique(config.getPlatform());
                MinioFileStorageClientFactory clientFactory = new MinioFileStorageClientFactory(config);
                MinioFileStorage storage = new MinioFileStorage(config, clientFactory);
                fileStorageService.getFileStorageList().add(storage);
                registeredStorages.add(storage);
            }
            log.info("SeaweedFS 存储平台已注册: platform={}, bucket={}",
                    config.getPlatform(), config.getBucketName());
        }
    }

    @PreDestroy
    void unregister() {
        for (MinioFileStorage storage : registeredStorages) {
            fileStorageService.getFileStorageList().remove(storage);
            storage.close();
        }
        registeredStorages.clear();
    }

    private void ensureUnique(String platform) {
        for (FileStorage storage : fileStorageService.getFileStorageList()) {
            if (platform.equals(storage.getPlatform())) {
                throw new IllegalStateException("文件存储平台标识重复: " + platform);
            }
        }
    }

    private void validate(SeaweedFsStorageProperties.SeaweedFsConfig config) {
        requireText(config.getPlatform(), "platform");
        if (!config.getPlatform().startsWith("seaweedfs-")) {
            throw new IllegalStateException("SeaweedFS 平台标识必须以 seaweedfs- 开头");
        }
        requireText(config.getAccessKey(), "access-key");
        requireText(config.getSecretKey(), "secret-key");
        requireText(config.getEndPoint(), "end-point");
        requireText(config.getBucketName(), "bucket-name");
    }

    private void requireText(String value, String field) {
        if (value == null || value.trim().isEmpty()) {
            throw new IllegalStateException("SeaweedFS 配置缺少 " + field);
        }
    }
}