package com.xuqm.push.service;

import com.xuqm.push.entity.DeviceTokenEntity;
import com.xuqm.push.repository.DeviceTokenRepository;
import com.xuqm.push.service.provider.PushProvider;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.scheduling.annotation.Async;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;
import java.util.Map;
import java.util.Optional;
import java.util.UUID;
import java.util.stream.Collectors;

@Service
public class PushDispatcher {

    private static final Logger log = LoggerFactory.getLogger(PushDispatcher.class);

    private final DeviceTokenRepository tokenRepository;
    private final Map<String, PushProvider> providers;

    public PushDispatcher(DeviceTokenRepository tokenRepository, List<PushProvider> providerList) {
        this.tokenRepository = tokenRepository;
        this.providers = providerList.stream()
                .collect(Collectors.toMap(PushProvider::vendorName, p -> p));
    }

    @Async
    public void pushToUser(String appId, String userId, String title, String body, String payload) {
        List<DeviceTokenEntity> tokens = tokenRepository.findByAppIdAndUserId(appId, userId);
        for (DeviceTokenEntity t : tokens) {
            PushProvider provider = providers.get(t.getVendor().name());
            if (provider != null) {
                boolean ok = provider.send(t.getToken(), title, body, payload);
                log.info("Push to {}@{} via {}: {}", userId, appId, t.getVendor(), ok ? "OK" : "FAIL");
            }
        }
    }

    public void registerToken(String appId, String userId, DeviceTokenEntity.Vendor vendor, String token) {
        Optional<DeviceTokenEntity> existing = tokenRepository.findByAppIdAndUserIdAndVendor(appId, userId, vendor);
        DeviceTokenEntity entity = existing.orElseGet(() -> {
            DeviceTokenEntity e = new DeviceTokenEntity();
            e.setId(UUID.randomUUID().toString());
            e.setAppId(appId);
            e.setUserId(userId);
            e.setVendor(vendor);
            e.setCreatedAt(LocalDateTime.now());
            return e;
        });
        entity.setToken(token);
        entity.setUpdatedAt(LocalDateTime.now());
        tokenRepository.save(entity);
    }
}