using System.Xml.Linq;
using JetBrains.Annotations;
using Microsoft.Extensions.Options;
using Volo.Abp;
using Volo.Abp.Caching;
using Volo.Abp.Data;
using Volo.Abp.MultiTenancy;
using Volo.Abp.MultiTenancy.ConfigurationStore;
using Volo.Abp.Uow;

namespace Yi.Framework.TenantManagement.Domain
{
    public class SqlSugarAndConfigurationTenantStore : DefaultTenantStore, ITenantStore
    {
        private ISqlSugarTenantRepository TenantRepository { get; }
        protected ICurrentTenant CurrentTenant { get; }
        protected IDistributedCache<TenantCacheItem> Cache { get; }
        private IUnitOfWorkManager _unitOfWorkManager;
        public SqlSugarAndConfigurationTenantStore(ISqlSugarTenantRepository repository,
            IDistributedCache<TenantCacheItem> cache,
        ICurrentTenant currentTenant,
        IOptionsMonitor<AbpDefaultTenantStoreOptions> options, IUnitOfWorkManager unitOfWorkManager) : base(options)
        {
            TenantRepository = repository;
            Cache = cache;
            CurrentTenant = currentTenant;
            _unitOfWorkManager = unitOfWorkManager;
        }

        public new TenantConfiguration? Find(string name)
        {
            throw new NotImplementedException("请使用异步方法");
        }

        public new TenantConfiguration? Find(Guid id)
        {
            throw new NotImplementedException("请使用异步方法");
        }

        public new async Task<TenantConfiguration?> FindAsync(string name)
        {
            var tenantFromOptions = await base.FindAsync(name);
            //如果配置文件不存在改租户
            if (tenantFromOptions is null)
            {
                return (await GetCacheItemAsync(null, name)).Value;
            }
            else
            {
                return tenantFromOptions;
            }
        }

        public new async Task<TenantConfiguration?> FindAsync(Guid id)
        {
            var tenantFromOptions = await base.FindAsync(id);
            if (tenantFromOptions is null)
            {
                return (await GetCacheItemAsync(id, null)).Value;
            }
            else
            {
                return tenantFromOptions;
            }
        }





        protected virtual async Task<TenantCacheItem> GetCacheItemAsync(Guid? id, string name)
        {
            var cacheKey = CalculateCacheKey(id, name);

            var cacheItem = await Cache.GetAsync(cacheKey, considerUow: true);
            if (cacheItem != null)
            {
                return cacheItem;
            }

            if (id.HasValue)
            {
                using (CurrentTenant.Change(null)) //TODO: No need this if we can implement to define host side (or tenant-independent) entities!
                {
                    TenantAggregateRoot tenant = null;
                    using (var uow=_unitOfWorkManager.Begin(isTransactional:false))
                    {
                         tenant = await TenantRepository.FindAsync(id.Value); 
                        await uow.CompleteAsync();
                    }
                  
                    return await SetCacheAsync(cacheKey, tenant);
                }
            }

            if (!name.IsNullOrWhiteSpace())
            {
                using (CurrentTenant.Change(null)) //TODO: No need this if we can implement to define host side (or tenant-independent) entities!
                {
                    var tenant = await TenantRepository.FindByNameAsync(name);
                    return await SetCacheAsync(cacheKey, tenant);
                }
            }
            throw new AbpException("Both id and name can't be invalid.");
        }

        protected virtual async Task<TenantCacheItem> SetCacheAsync(string cacheKey, [CanBeNull] TenantAggregateRoot tenant)
        {
            var tenantConfiguration = tenant != null ? MapToConfiguration(tenant) : null;
            var cacheItem = new TenantCacheItem(tenantConfiguration);
            await Cache.SetAsync(cacheKey, cacheItem, considerUow: true);
            return cacheItem;
        }

        private TenantConfiguration MapToConfiguration(TenantAggregateRoot tenantAggregateRoot)
        {
            var tenantConfiguration = new TenantConfiguration();
            tenantConfiguration.Id = tenantAggregateRoot.Id;
            tenantConfiguration.Name = tenantAggregateRoot.Name;
            tenantConfiguration.ConnectionStrings = MaptoString(tenantAggregateRoot.TenantConnectionString);
            tenantConfiguration.IsActive = true;
            return tenantConfiguration;
        }

        private ConnectionStrings? MaptoString(string tenantConnectionString)
        {
            var connectionStrings = new ConnectionStrings();
            connectionStrings[ConnectionStrings.DefaultConnectionStringName] = tenantConnectionString;
            return connectionStrings;
        }

        protected virtual string CalculateCacheKey(Guid? id, string name)
        {
            return TenantCacheItem.CalculateCacheKey(id, name);
        }
    }
}