package com.iailab.framework.tenant.core.service;

import com.baomidou.dynamic.datasource.creator.DataSourceProperty;
import com.iailab.framework.common.pojo.CommonResult;
import com.iailab.framework.common.util.cache.CacheUtils;
import com.iailab.module.system.api.tenant.TenantApi;
import com.google.common.cache.CacheLoader;
import com.google.common.cache.LoadingCache;

import com.iailab.module.system.api.tenant.dto.TenantDataSourceConfigRespDTO;
import lombok.RequiredArgsConstructor;
import lombok.SneakyThrows;

import java.time.Duration;
import java.util.List;

import static com.iailab.framework.common.util.cache.CacheUtils.buildAsyncReloadingCache;

/**
 * Tenant 框架 Service 实现类
 *
 * @author iailab
 */
@RequiredArgsConstructor
public class TenantFrameworkServiceImpl implements TenantFrameworkService {

    private final TenantApi tenantApi;

    /**
     * 针对 {@link #getTenantIds()} 的缓存
     */
    private final LoadingCache<Object, List<Long>> getTenantIdsCache = buildAsyncReloadingCache(
            Duration.ofMinutes(1L), // 过期时间 1 分钟
            new CacheLoader<Object, List<Long>>() {

                @Override
                public List<Long> load(Object key) {
                    return tenantApi.getTenantIdList().getCheckedData();
                }

            });

    /**
     * 针对 {@link #validTenant(Long)} 的缓存
     */
    private final LoadingCache<Long, CommonResult<Boolean>> validTenantCache = buildAsyncReloadingCache(
            Duration.ofMinutes(1L), // 过期时间 1 分钟
            new CacheLoader<Long, CommonResult<Boolean>>() {

                @Override
                public CommonResult<Boolean> load(Long id) {
                    return tenantApi.validTenant(id);
                }

            });

    /**
     * 针对 {@link #getDataSourceProperty(Long)} 的缓存
     */
    private final LoadingCache<Long, DataSourceProperty> dataSourcePropertyCache = CacheUtils.buildAsyncReloadingCache(
            Duration.ofMinutes(1L), // 过期时间 1 分钟
            new CacheLoader<Long, DataSourceProperty>() {

                @Override
                public DataSourceProperty load(Long id) {
                    // 获得租户对应的数据源配置
                    TenantDataSourceConfigRespDTO dataSourceConfig = tenantApi.getTenantDataSourceConfig(id);
                    if (dataSourceConfig == null) {
                        return null;
                    }
                    // 转换成 dynamic-datasource 配置
//                    return new DataSourceProperty()
//                            .setPoolName(dataSourceConfig.getName()).setUrl(dataSourceConfig.getUrl())
//                            .setUsername(dataSourceConfig.getUsername()).setPassword(dataSourceConfig.getPassword());

                    DataSourceProperty ds = new DataSourceProperty();
                    ds.setPoolName(dataSourceConfig.getName());
                    ds.setUrl(dataSourceConfig.getUrl());
                    ds.setUsername(dataSourceConfig.getUsername());
                    ds.setPassword(dataSourceConfig.getPassword());
                    return ds;
                }

            });

    @Override
    @SneakyThrows
    public List<Long> getTenantIds() {
        return getTenantIdsCache.get(Boolean.TRUE);
    }

    @Override
    @SneakyThrows
    public void validTenant(Long id) {
        validTenantCache.get(id).checkError();
    }

    @Override
    @SneakyThrows
    public DataSourceProperty getDataSourceProperty(Long id) {
        return dataSourcePropertyCache.get(id);
    }
}