using System.Reflection;
using System.Text;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging;
using Microsoft.Extensions.Options;
using NPin.Framework.SqlSugarCore.Abstractions;
using SqlSugar;
using Volo.Abp.Auditing;
using Volo.Abp.Data;
using Volo.Abp.DependencyInjection;
using Volo.Abp.Domain.Entities;
using Volo.Abp.Domain.Entities.Events;
using Volo.Abp.Guids;
using Volo.Abp.MultiTenancy;
using Volo.Abp.Users;

namespace NPin.Framework.SqlSugarCore;

public class SqlSugarDbContext : ISqlSugarDbContext
{
    private IAbpLazyServiceProvider LazyServiceProvider { get; }

    public ISqlSugarClient SqlSugarClient { get; private set; }
    public DbConnOptions Options => LazyServiceProvider.LazyGetRequiredService<IOptions<DbConnOptions>>().Value;

    private AbpDbConnectionOptions _connectionOptions =>
        LazyServiceProvider.LazyGetRequiredService<IOptions<AbpDbConnectionOptions>>().Value;

    public ICurrentUser CurrentUser => LazyServiceProvider.GetRequiredService<ICurrentUser>();
    public ICurrentTenant CurrentTenant => LazyServiceProvider.LazyGetRequiredService<ICurrentTenant>();
    public IDataFilter DataFilter => LazyServiceProvider.LazyGetRequiredService<IDataFilter>();

    private IGuidGenerator GuidGenerator => LazyServiceProvider.LazyGetRequiredService<IGuidGenerator>();

    protected ILoggerFactory Logger => LazyServiceProvider.LazyGetRequiredService<ILoggerFactory>();
    protected virtual bool IsMultiTenantFilterEnabled => DataFilter?.IsEnabled<IMultiTenant>() ?? false;
    protected virtual bool IsSoftDeleteFilterEnabled => DataFilter?.IsEnabled<ISoftDelete>() ?? false;

    public IEntityChangeEventHelper EntityChangeEventHelper =>
        LazyServiceProvider.LazyGetService<IEntityChangeEventHelper>(NullEntityChangeEventHelper.Instance);

    public void SetSqlSugarClient(ISqlSugarClient sqlSugarClient)
    {
        SqlSugarClient = sqlSugarClient;
    }

    public SqlSugarDbContext(IAbpLazyServiceProvider lazyServiceProvider)
    {
        LazyServiceProvider = lazyServiceProvider;
        var connectionCreator = LazyServiceProvider.LazyGetRequiredService<ISqlSugarDbConnectionCreator>();
        connectionCreator.OnSqlSugarClientConfig = OnSqlSugarClientConfig;
        connectionCreator.EntityService = EntityService;
        connectionCreator.EntityNameService = EntityNameService;
        connectionCreator.DataExecuting = DataExecuting;
        connectionCreator.DataExecuted = DataExecuted;
        connectionCreator.OnLogExecuting = OnLogExecuting;
        connectionCreator.OnLogExecuted = OnLogExecuted;
        var connStr = GetCurrentConnectionString();

        SqlSugarClient = new SqlSugarClient(connectionCreator.Build(action: opt =>
        {
            opt.ConnectionString = connStr;
        }));
        connectionCreator.SetDbAop(SqlSugarClient);
    }

    /// <summary>
    /// db切换多库支持
    /// </summary>
    /// <returns></returns>
    protected virtual string GetCurrentConnectionString()
    {
        var defaultUrl = Options.Url ??
                         _connectionOptions.GetConnectionStringOrNull(ConnectionStrings.DefaultConnectionStringName);
        // 如果未开启多租户，返回db url 或者 默认连接字符串
        if (!Options.EnabledSaasMultiTenancy)
        {
            return defaultUrl;
        }

        // 开启多租户
        var connectionStringResolver = LazyServiceProvider.LazyGetRequiredService<IConnectionStringResolver>();
        var connectionString = connectionStringResolver.ResolveAsync().Result;

        // 没有检测到使用多租户功能，默认使用默认库即可
        if (string.IsNullOrWhiteSpace(connectionString))
        {
            Volo.Abp.Check.NotNull(Options.Url, "租户默认库Default未找到");
            connectionString = defaultUrl;
        }

        return connectionString!;
    }

    /// <summary>
    /// 上下文对象扩展
    /// </summary>
    /// <param name="sqlSugarClient"></param>
    protected virtual void OnSqlSugarClientConfig(ISqlSugarClient sqlSugarClient)
    {
        //需自定义扩展
        if (IsSoftDeleteFilterEnabled)
        {
            sqlSugarClient.QueryFilter.AddTableFilter<ISoftDelete>(u => u.IsDeleted == false);
        }

        if (IsMultiTenantFilterEnabled)
        {
            sqlSugarClient.QueryFilter.AddTableFilter<IMultiTenant>(u => u.TenantId == CurrentTenant.Id);
        }

        // 自定义其它Filter
        CustomDataFilter(sqlSugarClient);
    }

    protected virtual void CustomDataFilter(ISqlSugarClient sqlSugarClient)
    {
    }

    protected virtual void DataExecuted(object oldValue, DataAfterModel entityInfo)
    {
    }

    protected virtual void DataExecuting(object? oldValue, DataFilterModel entityInfo)
    {
        // 审计日志
        switch (entityInfo.OperationType)
        {
            case DataFilterType.UpdateByObject:
                if (entityInfo.PropertyName.Equals(nameof(IAuditedObject.LastModificationTime)))
                {
                    if (!DateTime.MinValue.Equals(oldValue))
                    {
                        entityInfo.SetValue(DateTime.Now);
                    }
                }

                if (entityInfo.PropertyName.Equals(nameof(IAuditedObject.LastModifierId)))
                {
                    if (CurrentUser.Id != null)
                    {
                        entityInfo.SetValue(CurrentUser.Id);
                    }
                }

                break;
            case DataFilterType.InsertByObject:
                if (entityInfo.PropertyName.Equals(nameof(IEntity<Guid>.Id)))
                {
                    //主键为空或者为默认最小值
                    if (Guid.Empty.Equals(oldValue))
                    {
                        entityInfo.SetValue(GuidGenerator.Create());
                    }
                }

                if (entityInfo.PropertyName.Equals(nameof(IAuditedObject.CreationTime)))
                {
                    //为空或者为默认最小值
                    if (oldValue is null || DateTime.MinValue.Equals(oldValue))
                    {
                        entityInfo.SetValue(DateTime.Now);
                    }
                }

                if (entityInfo.PropertyName.Equals(nameof(IAuditedObject.CreatorId)))
                {
                    if (CurrentUser.Id != null)
                    {
                        entityInfo.SetValue(CurrentUser.Id);
                    }
                }

                //插入时，需要租户id,先预留
                if (entityInfo.PropertyName.Equals(nameof(IMultiTenant.TenantId)))
                {
                    if (CurrentTenant is not null)
                    {
                        entityInfo.SetValue(CurrentTenant.Id);
                    }
                }

                break;
        }


        //领域事件
        switch (entityInfo.OperationType)
        {
            case DataFilterType.InsertByObject:
                if (entityInfo.PropertyName == nameof(IEntity<object>.Id))
                {
                    EntityChangeEventHelper.PublishEntityCreatedEvent(entityInfo.EntityValue);
                }

                break;
            case DataFilterType.UpdateByObject:
                if (entityInfo.PropertyName == nameof(IEntity<object>.Id))
                {
                    //软删除，发布的是删除事件
                    if (entityInfo.EntityValue is ISoftDelete softDelete)
                    {
                        if (softDelete.IsDeleted)
                        {
                            EntityChangeEventHelper.PublishEntityDeletedEvent(entityInfo.EntityValue);
                        }
                    }
                    else
                    {
                        EntityChangeEventHelper.PublishEntityUpdatedEvent(entityInfo.EntityValue);
                    }
                }

                break;
            case DataFilterType.DeleteByObject:
                if (entityInfo.PropertyName == nameof(IEntity<object>.Id))
                {
                    EntityChangeEventHelper.PublishEntityDeletedEvent(entityInfo.EntityValue);
                }

                break;
        }
    }

    protected virtual void OnLogExecuting(string sql, SugarParameter[] pars)
    {
    }

    protected virtual void OnLogExecuted(string sql, SugarParameter[] pars)
    {
        if (Options.EnabledSqlLog)
        {
            var log = Logger.CreateLogger<SqlSugarDbContext>();

            var sb = new StringBuilder();
            sb.AppendLine();
            sb.AppendLine("==========NPin-SQL==========");
            sb.AppendLine(UtilMethods.GetNativeSql(sql, pars));
            sb.AppendLine($"Count: {SqlSugarClient.Ado.SqlExecuteCount}");
            sb.AppendLine($"耗时 {SqlSugarClient.Ado.SqlExecutionTime.TotalMilliseconds} 毫秒");
            log.LogDebug(sb.ToString());
        }
    }

    /// <summary>
    /// 实体配置
    /// 自动 Nullable
    /// 自动主键
    /// 自动Ignore关联配置（导航）
    /// 开启下划线
    /// </summary>
    /// <param name="property"></param>
    /// <param name="column"></param>
    protected virtual void EntityService(PropertyInfo property, EntityColumnInfo column)
    {
        // 自动 Nullable
        if (new NullabilityInfoContext().Create(property).WriteState is NullabilityState.Nullable)
        {
            column.IsNullable = true;
        }

        if (property.Name == "ConcurrencyStamp")
        {
            column.IsIgnore = true;
        }
        if (property.PropertyType == typeof(ExtraPropertyDictionary))
        {
            column.IsIgnore = true;
        }

        if (property.Name == nameof(Entity<object>.Id))
        {
            column.IsPrimarykey = true;
        }

        column.DbColumnName = UtilMethods.ToUnderLine(column.DbColumnName);
    }

    /// <summary>
    /// EntityName 配置
    /// 开启下划线
    /// </summary>
    /// <param name="type"></param>
    /// <param name="entity"></param>
    protected virtual void EntityNameService(Type type, EntityInfo entity)
    {
        // 开启下划线
        entity.DbTableName = UtilMethods.ToUnderLine(entity.DbTableName);
    }

    public void Backup()
    {
        string directoryName = "database_backup";
        string fileName = $"{SqlSugarClient.Ado.Connection.Database}_" + DateTime.Now.ToString("yyyyMMdd_HHmmss");
        if (!Directory.Exists(directoryName))
        {
            Directory.CreateDirectory(directoryName);
        }

        switch (Options.DbType)
        {
            case DbType.MySql:
                // mysql 只支持.net core
                SqlSugarClient.DbMaintenance.BackupDataBase(SqlSugarClient.Ado.Connection.Database,
                    $"{Path.Combine(directoryName, fileName)}.sql");
                break;
            case DbType.Sqlite:
                // sqlite 只支持.net core
                SqlSugarClient.DbMaintenance.BackupDataBase(null, $"{fileName}.db");
                break;
            case DbType.SqlServer:
                // 第一个参数库名
                SqlSugarClient.DbMaintenance.BackupDataBase(SqlSugarClient.Ado.Connection.Database,
                    $"{Path.Combine(directoryName, fileName)}.bak");
                break;
            default:
                throw new NotImplementedException("其他数据库备份未实现");
        }
    }
}