using Google.Protobuf;
using Google.Protobuf.WellKnownTypes;


using ServerCore;
using ServerBase;
using ServerCommon;
using ServerCommon.BusinessLogDomain;
using MetaAssets;


namespace GameServer;

public class DBQAddFriend : 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;

    private string m_my_guid = string.Empty;
    private string m_friend_guid = string.Empty;

    public DBQAddFriend(string myGuid, string friendGuid) 
        : base(typeof(DBQAddFriend).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;
        m_my_guid = myGuid;
        m_friend_guid = friendGuid;
    }

    //===================================================================================================
    // DB 쿼리 직전에 준비해야 할 로직들을 작성한다.
    //===================================================================================================

    public override Task<Result> onPrepareQuery()
    {
        var result = new Result();

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

        DateTime now = DateTimeHelper.Current;

        m_my_doc = new FriendDoc();
        m_friend_doc = new FriendDoc();
        
        var my_attrib = m_my_doc.getAttrib<FriendAttrib>();
        NullReferenceCheckHelper.throwIfNull(my_attrib, () => "my_attrib is null !!!");

        my_attrib.FriendGuid = m_friend_combination_key_for_pk;
        my_attrib.CreateTime = now;
        my_attrib.FolderName = ServerCommon.Constant.FRIEND_FOLDER_DEFUALT_NAME;
        my_attrib.IsNew = 1;

        var friend_attrib = m_friend_doc.getAttrib<FriendAttrib>();
        NullReferenceCheckHelper.throwIfNull(friend_attrib, () => "friend_attrib is null !!!");

        friend_attrib.FriendGuid = m_my_combination_key_for_pk;
        friend_attrib.CreateTime = now;
        friend_attrib.FolderName = ServerCommon.Constant.FRIEND_FOLDER_DEFUALT_NAME;
        friend_attrib.IsNew = 1;

        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()} - {player.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 player = getOwner();
        NullReferenceCheckHelper.throwIfNull(player, () => "player is null !!!");

        var query_batch = getQueryBatch();
        NullReferenceCheckHelper.throwIfNull(query_batch, () => $"query_batch is null !!! - {player.toBasicString()}");

        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()}, {player.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()}, {player.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.Upsert);
        var my_friend_ctx = new DynamoDbDocumentQueryContext(table.TableName, friend_document, QueryType.Upsert);

        (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 !!! m_my_pk = {m_my_pk}, m_friend_pk = {m_friend_pk} - {toBasicString()}, {player.toBasicString()}";
            result.setFail(ServerErrorCode.DynamoDbTransactException, err_msg);
            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();

        Friend friend = new(owner);
        var new_friend_attribue = friend.getEntityAttribute<FriendAttribute>();
        NullReferenceCheckHelper.throwIfNull(new_friend_attribue, () => "new_friend_attribue is null !!!");

        var friend_attrib = m_friend_doc.getAttrib<FriendAttrib>();
        NullReferenceCheckHelper.throwIfNull(friend_attrib, () => "friend_attrib is null !!!");

        new_friend_attribue.UserGuid = m_my_guid;
        new_friend_attribue.FriendGuid = m_friend_guid;
        new_friend_attribue.CreateTime = friend_attrib.CreateTime;
        new_friend_attribue.FolderName = friend_attrib.FolderName;
        new_friend_attribue.IsNew = friend_attrib.IsNew;

        friends.TryAdd(m_friend_guid, friend);
        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;
}