using ServerCommon;
using ServerCore; using ServerBase;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace GameServer;

public class DBQDeleteFriend : QueryExecutorBase
{
    private string m_my_combination_key_for_pk = string.Empty;
    private string m_my_combination_key_for_sk = string.Empty;
    private string m_friend_combination_key_for_pk = string.Empty;
    private string m_friend_combination_key_for_sk = string.Empty;

    private FriendDoc m_my_doc = new();
    private string m_my_pk = string.Empty;
    private FriendDoc m_friend_doc = new();
    private string m_friend_pk = string.Empty;


    public DBQDeleteFriend(string myGuid, string friendGuid)
        : base(typeof(DBQDeleteFriend).Name)
    {
        m_my_combination_key_for_pk = myGuid;
        m_my_combination_key_for_sk = friendGuid;
        m_friend_combination_key_for_pk = friendGuid;
        m_friend_combination_key_for_sk = myGuid;
    }

    
    //===================================================================================================
    // DB 쿼리 직전에 준비해야 할 로직들을 작성한다.
    //===================================================================================================
    public override Task<Result> onPrepareQuery()
    {
        var result = new Result();

        var owner = getOwner();
        NullReferenceCheckHelper.throwIfNull(owner, () => "owner is null !!!");

        m_my_doc = new FriendDoc();
        m_friend_doc = new FriendDoc();

        m_my_doc.setCombinationKeyForPKSK(m_my_combination_key_for_pk, m_my_combination_key_for_sk);
        m_friend_doc.setCombinationKeyForPKSK(m_friend_combination_key_for_pk, m_friend_combination_key_for_sk);

        var my_error_code = m_my_doc.onApplyPKSK();
        var friend_error_code = m_friend_doc.onApplyPKSK();
        if (my_error_code.isFail() || friend_error_code.isFail())
        {
            var err_msg = $"Failed to onApplyPKSK() !!! my_error_code : {my_error_code.toBasicString()},  friend_error_code : {friend_error_code.toBasicString()} - {owner.toBasicString()}";
            result.setFail(my_error_code, err_msg);
            Log.getLogger().error(err_msg);
            return Task.FromResult(result);
        }

        m_my_pk = m_my_doc.getPK();
        m_friend_pk = m_friend_doc.getPK();

        return Task.FromResult(result);
    }

    //===================================================================================================
    // onPrepareQuery()를 성공할 경우 호출된다.
    //===================================================================================================
    public override async Task<Result> onQuery()
    {
        var result = new Result();

        var query_batch = getQueryBatch();
        NullReferenceCheckHelper.throwIfNull(query_batch, () => "query_batch is null !!!");

        var db_connector = query_batch.getDynamoDbConnector();

        (result, var my_document) = await m_my_doc.onCopyToDocument();
        if (result.isFail())
        {
            var err_msg = $"Failed to onCopyToDocument() !!! : {result.toBasicString()}, m_my_pk:{m_my_pk}, m_friend_pk:{m_friend_pk} - {toBasicString()}";
            Log.getLogger().error(err_msg);
            return result;
        }

        (result, var friend_document) = await m_friend_doc.onCopyToDocument();
        if (result.isFail())
        {
            var err_msg = $"Failed to onCopyToDocument() !!! : {result.toBasicString()}, m_my_pk:{m_my_pk}, m_friend_pk:{m_friend_pk} - {toBasicString()}";
            Log.getLogger().error(err_msg);
            return result;
        }

        var table = db_connector.getTableByDoc(m_friend_doc);
        var my_docmument_ctx = new DynamoDbDocumentQueryContext(table.TableName, my_document, QueryType.Delete);
        var my_friend_ctx = new DynamoDbDocumentQueryContext(table.TableName, friend_document, QueryType.Delete);
        (result, _) = await table.simpleTransactWriteWithDocument(new List<DynamoDbDocumentQueryContext>() { my_docmument_ctx, my_friend_ctx }, 2, query_batch.getTransId());
        if (result.isFail())
        {
            var err_msg = $"Failed to simpleTransactWrite !!! : {result.toBasicString()}, m_my_pk:{m_my_pk}, m_friend_pk:{m_friend_pk} - {toBasicString()}";
            Log.getLogger().error(err_msg);

            return result;
        }

        return result;
    }

    //===================================================================================================
    // DB 쿼리를 성공하고, doFnCommit()가 QueryResultType.NotCalledQueryFunc를 반환할 경우 호출된다.
    //===================================================================================================
    public override Task onQueryResponseCommit()
    {
        //여기서 메모리 업데이트
        var owner = getOwner();
        NullReferenceCheckHelper.throwIfNull(owner, () => "owner is null !!!");

        var friend_agent_action = owner.getEntityAction<FriendAgentAction>();
        NullReferenceCheckHelper.throwIfNull(friend_agent_action, () => "friend_agent_action is null !!!");

        var friends = friend_agent_action.getFriends();

        if (false == friends.TryRemove(m_friend_combination_key_for_pk, out var friend))
        { 
            var err_msg = $"Delete Friend : Failed to TryRemove !!! m_my_combination_key_for_sk = {m_my_combination_key_for_sk}, m_friend_combination_key_for_sk = {m_friend_combination_key_for_sk} - {toBasicString()}";
            Log.getLogger().error(err_msg);
        }

        return Task.CompletedTask;
    }

    //===================================================================================================
    // DB 쿼리를 실패하고, doFnRollback()가 QueryResultType.NotCalledQueryFunc를 반환할 경우 호출된다.
    //===================================================================================================
    public override Task onQueryResponseRollback(Result errorResult)
    {
        return Task.CompletedTask;
    }

    private new Player? getOwner() => getQueryBatch()?.getLogActor() as Player;
}