package com.xuqm.tenant.service;

import com.xuqm.common.exception.BusinessException;
import com.xuqm.tenant.entity.FeatureServiceEntity;
import com.xuqm.tenant.entity.ServiceActivationRequestEntity;
import com.xuqm.tenant.entity.ServiceActivationRequestEntity.Status;
import com.xuqm.tenant.repository.FeatureServiceRepository;
import com.xuqm.tenant.repository.ServiceActivationRequestRepository;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.time.LocalDateTime;
import java.util.List;
import java.util.UUID;

@Service
public class FeatureServiceManager {

    private final FeatureServiceRepository repository;
    private final ServiceActivationRequestRepository requestRepository;

    public FeatureServiceManager(FeatureServiceRepository repository,
                                 ServiceActivationRequestRepository requestRepository) {
        this.repository = repository;
        this.requestRepository = requestRepository;
    }

    public List<FeatureServiceEntity> listByApp(String appId) {
        return repository.findByAppId(appId);
    }

    /**
     * Submit an activation request. Disabling is immediate; enabling requires ops approval.
     */
    @Transactional
    public ServiceActivationRequestEntity submitActivationRequest(
            String appId,
            FeatureServiceEntity.Platform platform,
            FeatureServiceEntity.ServiceType serviceType,
            String applyReason) {

        // Check if there's already a pending request
        requestRepository.findFirstByAppIdAndPlatformAndServiceTypeOrderByCreatedAtDesc(appId, platform, serviceType)
                .ifPresent(req -> {
                    if (req.getStatus() == Status.PENDING) {
                        throw new BusinessException(400, "已有待审核的开通申请，请等待运营人员处理");
                    }
                });

        ServiceActivationRequestEntity req = new ServiceActivationRequestEntity();
        req.setId(UUID.randomUUID().toString());
        req.setAppId(appId);
        req.setPlatform(platform);
        req.setServiceType(serviceType);
        req.setStatus(Status.PENDING);
        req.setApplyReason(applyReason);
        req.setCreatedAt(LocalDateTime.now());
        return requestRepository.save(req);
    }

    /**
     * Disable a service immediately (no approval needed).
     */
    @Transactional
    public FeatureServiceEntity disable(String appId, FeatureServiceEntity.Platform platform,
                                        FeatureServiceEntity.ServiceType serviceType) {
        FeatureServiceEntity entity = repository
                .findByAppIdAndPlatformAndServiceType(appId, platform, serviceType)
                .orElseThrow(() -> new BusinessException(404, "服务未开通"));
        entity.setEnabled(false);
        return repository.save(entity);
    }

    /**
     * Called by ops when approving an activation request.
     */
    @Transactional
    public ServiceActivationRequestEntity approveRequest(String requestId, String reviewNote) {
        ServiceActivationRequestEntity req = requestRepository.findById(requestId)
                .orElseThrow(() -> new BusinessException(404, "申请不存在"));
        if (req.getStatus() != Status.PENDING) {
            throw new BusinessException(400, "申请已处理");
        }
        req.setStatus(Status.APPROVED);
        req.setReviewNote(reviewNote);
        req.setReviewedAt(LocalDateTime.now());
        requestRepository.save(req);

        // Activate the service
        FeatureServiceEntity entity = repository
                .findByAppIdAndPlatformAndServiceType(req.getAppId(), req.getPlatform(), req.getServiceType())
                .orElseGet(() -> {
                    FeatureServiceEntity e = new FeatureServiceEntity();
                    e.setId(UUID.randomUUID().toString());
                    e.setAppId(req.getAppId());
                    e.setPlatform(req.getPlatform());
                    e.setServiceType(req.getServiceType());
                    e.setCreatedAt(LocalDateTime.now());
                    return e;
                });
        entity.setEnabled(true);
        repository.save(entity);
        return req;
    }

    /**
     * Called by ops when rejecting an activation request.
     */
    @Transactional
    public ServiceActivationRequestEntity rejectRequest(String requestId, String reviewNote) {
        ServiceActivationRequestEntity req = requestRepository.findById(requestId)
                .orElseThrow(() -> new BusinessException(404, "申请不存在"));
        if (req.getStatus() != Status.PENDING) {
            throw new BusinessException(400, "申请已处理");
        }
        req.setStatus(Status.REJECTED);
        req.setReviewNote(reviewNote);
        req.setReviewedAt(LocalDateTime.now());
        return requestRepository.save(req);
    }

    public List<ServiceActivationRequestEntity> listRequestsByApp(String appId) {
        return requestRepository.findByAppIdOrderByCreatedAtDesc(appId);
    }

    public FeatureServiceEntity getOrFail(String appId, FeatureServiceEntity.Platform platform,
                                          FeatureServiceEntity.ServiceType serviceType) {
        return repository.findByAppIdAndPlatformAndServiceType(appId, platform, serviceType)
                .orElseThrow(() -> new BusinessException(404, "服务未配置"));
    }

}