using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;


using Amazon.DynamoDBv2;
using Amazon.DynamoDBv2.DocumentModel;
using ServerCore; using ServerBase;


namespace ServerBase;

//=============================================================================================
// DB 쿼리 ItemRequest 타입 구현 하기위한 추상 + 제네릭 클래스 이다.
//=============================================================================================
public abstract partial class QueryDbRequesterWithItemRequestBase<TDbRequestType> : IQueryDbRequester
    where TDbRequestType : AmazonDynamoDBRequest, new()
{
    private QueryBatchBase? m_query_batch;
    private readonly TDbRequestType m_db_request;

    private DynamoDbQueryExceptionNotifier m_exception_notifier = new();

    public QueryDbRequesterWithItemRequestBase()
    {
        m_db_request = new TDbRequestType();
    }

    public abstract Task<Result> doDbRequestAsync();

    public DynamoDbQueryExceptionNotifier getDynamoDbQueryExceptionNotifier() => m_exception_notifier;
}


//=============================================================================================
// DB 쿼리 DocumentBatchWrite 타입 구현 하기위한 추상 + 제네릭 클래스 이다.
//=============================================================================================
public abstract partial class QueryDbRequesterWithDocumentBatchWriteBase<TDbRequestType> : IQueryDbRequester, IWithDocumentModel
    where TDbRequestType : DocumentBatchWrite
{
    private QueryBatchBase? m_query_batch;
    private TDbRequestType? m_db_request;
    private Table? m_table;

    private DynamoDbQueryExceptionNotifier m_exception_notifier = new();

    public void onCreateDocumentModel(Table table)
    {
        m_table = table;

        var db_request_type = table.CreateBatchWrite() as TDbRequestType;
        NullReferenceCheckHelper.throwIfNull(db_request_type, () => $"db_request_type is null !!!");

        m_db_request = db_request_type;
    }

    public abstract Task<Result> doDbRequestAsync();

    public DynamoDbQueryExceptionNotifier getDynamoDbQueryExceptionNotifier() => m_exception_notifier;
}


//=============================================================================================
// DB 쿼리 DocumentBatchGet 타입 구현 하기위한 추상 + 제네릭 클래스 이다.
//=============================================================================================
public abstract partial class QueryDbRequesterWithDocumentBatchGetBase<TDbRequestType> : IQueryDbRequester, IWithDocumentModel
    where TDbRequestType : DocumentBatchGet
{
    private QueryBatchBase? m_query_batch;
    private TDbRequestType? m_db_request;
    private Table? m_table;

    private DynamoDbQueryExceptionNotifier m_exception_notifier = new();

    public void onCreateDocumentModel(Table table)
    {
        m_table = table;
        m_db_request = table.CreateBatchGet() as TDbRequestType;
    }

    public abstract Task<Result> doDbRequestAsync();

    public DynamoDbQueryExceptionNotifier getDynamoDbQueryExceptionNotifier() => m_exception_notifier;
}


//=============================================================================================
// DB 쿼리 DocumentTransactWrite 타입 구현 하기위한 추상 + 제네릭 클래스 이다.
//=============================================================================================
public abstract partial class QueryDbRequesterWithDocumentTransactWriteBase<TDbRequestType> : IQueryDbRequester, IWithDocumentModel
    where TDbRequestType : DocumentTransactWrite
{
    private QueryBatchBase? m_query_batch = null;
    private TDbRequestType? m_db_request;
    private Table? m_table;

    private DynamoDbQueryExceptionNotifier m_exception_notifier = new();

    public void onCreateDocumentModel(Table table)
    {
        m_table = table;
        m_db_request = table.CreateTransactWrite() as TDbRequestType;
    }

    public abstract Task<Result> doDbRequestAsync();

    public DynamoDbQueryExceptionNotifier getDynamoDbQueryExceptionNotifier() => m_exception_notifier;
}

//=============================================================================================
// DB 쿼리 DocumentTransactGet 타입 구현 하기위한 추상 + 제네릭 클래스 이다.
//=============================================================================================
public abstract partial class QueryDbRequesterWithDocumentTransactGetBase<TDbRequestType> : IQueryDbRequester, IWithDocumentModel
    where TDbRequestType : DocumentTransactGet
{
    private QueryBatchBase? m_query_batch = null;
    private TDbRequestType? m_db_request;
    private Table? m_table;

    private DynamoDbQueryExceptionNotifier m_exception_notifier = new();

    public void onCreateDocumentModel(Table table)
    {
        m_table = table;
        m_db_request = table.CreateTransactGet() as TDbRequestType;
    }

    public abstract Task<Result> doDbRequestAsync();

    public DynamoDbQueryExceptionNotifier getDynamoDbQueryExceptionNotifier() => m_exception_notifier;
}