using System.Collections.Concurrent;

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

using ServerCore;
using ServerBase;
using ServerCommon;

using static ClientToGameReq.Types;
using static ClientToGameRes.Types;


using ALERT_KEY = System.String;


namespace GameServer;

public class EntityAlertAction : EntityActionBase
{
    public delegate Task<(Result, List<DynamoDbDocBase>, EntityAlertMethodType)> FnAlertFunction(EntityAlertTriggerType triggerType);

    private ConcurrentDictionary<EntityAlertTriggerType, FnAlertFunction> m_alert_functions = new();
    private ConcurrentDictionary<EntityAlertTriggerType, bool> m_alert_toggles = new(); // true일 경우 알림 트리거 활성화 !!!

    public EntityAlertAction(EntityBase owner) 
        : base(owner)
    {
    }

    public override Task<Result> onInit()
    {
        return Task.FromResult(new Result());
    }

    public override void onClear()
    {

    }

    public async Task onApplyEntityAlertType()
    {
        var owner = getOwner();
        NullReferenceCheckHelper.throwIfNull(owner, () => $"owner is null !!!");
        var parent = owner.getRootParent();
        NullReferenceCheckHelper.throwIfNull(parent, () => $"parent is null !!! - {owner.toBasicString()}");

        var err_msg = string.Empty;
        var result = new Result();

        if(0 >= m_alert_functions.Count)
        {
            return;
        }

        await loadEntityAlertRecordFromDb();
    }

    private async Task<Result> loadEntityAlertRecordFromDb()
    {
        var owner = getOwner();
        NullReferenceCheckHelper.throwIfNull(owner, () => $"owner is null !!!");
        var parent = owner.getRootParent();
        NullReferenceCheckHelper.throwIfNull(parent, () => $"parent is null !!! - {owner.toBasicString()}");

        var server_logic = GameServerApp.getServerLogic();
        var dynamo_db_connector = server_logic.getDynamoDbClient();

        var err_msg = string.Empty;
        var result = new Result();

        if (false == owner.isValidOwnerEntityTypeWithGuid())
        {
            err_msg = $"Invalid Owner !!! : ownerType:{owner.onGetOwnerEntityType()}, ownerGuid:{owner.onGetGuidOfOwnerEntityType()} - {owner.toBasicString()}, {parent.toBasicString()}";
            result.setFail(ServerErrorCode.OwnerInvalid, err_msg);
            Log.getLogger().error(result.toBasicString());
            return result;
        }

        foreach (var each in m_alert_functions)
        {
            var trigger_type = each.Key;

            var owner_guid = owner.onGetGuidOfOwnerEntityType();
            ConditionValidCheckHelper.throwIfFalseWithCondition(() => false == owner_guid.isNullOrWhiteSpace(), () => $"Invalid OwnerGuid !!! : {owner_guid} - {owner.toBasicString()}, {parent.toBasicString()}");
            (result, var sk) = makeAlertKey(trigger_type);
            if (result.isFail())
            {
                return result;
            }
            ConditionValidCheckHelper.throwIfFalseWithCondition(() => false == sk.isNullOrWhiteSpace(), () => $"Invalid SK !!! : {sk} - {owner.toBasicString()}, {parent.toBasicString()}");

            (result, var make_primary_key) = await DynamoDBDocBaseHelper.makePrimaryKey<EntityAlertRecordDoc>(owner_guid, sk);
            if (result.isFail())
            {
                return result;
            }
            NullReferenceCheckHelper.throwIfNull(make_primary_key, () => $"make_primary_key is null !!! : ownerGuid:{owner_guid}, sk:{sk} - {owner.toBasicString()}, {parent.toBasicString()}");

            var query_config = dynamo_db_connector.makeQueryConfigForReadByPKSK(make_primary_key.PK, make_primary_key.SK);
            (result, var found_alert_record_doc) = await dynamo_db_connector.simpleQueryDocTypeWithQueryOperationConfig<EntityAlertRecordDoc>(query_config, false);
            if (result.isFail())
            {
                continue;
            }

            if (null == found_alert_record_doc)
            {
                m_alert_toggles[trigger_type] = true;
            }
            else
            {
                m_alert_toggles[trigger_type] = false;
            }
        }

        return result;
    }

    public async Task onAlert(EntityAlertTriggerType alertTriggerType)
    {
        var owner = getOwner();
        NullReferenceCheckHelper.throwIfNull(owner, () => $"owner is null !!!");
        var parent = owner.getRootParent();
        NullReferenceCheckHelper.throwIfNull(parent, () => $"parent is null !!! - {owner.toBasicString()}");

        var err_msg = string.Empty;
        var result = new Result();

        Player? master = null;
        if (parent is Player player)
        {
            master = player;
        }
        else if (parent is UgcNpc ugc_npc)
        {
            master = ugc_npc.onGetMasterEntity() as Player;
        }
        else
        {
            err_msg = $"Invalid EntityType !!! : EntityType:{parent.getEntityType()} - {owner.toBasicString()}, {parent.toBasicString()}";
            Log.getLogger().error(err_msg);
            return;
        }
        NullReferenceCheckHelper.throwIfNull(master, () => $"master is null !!! - {owner.toBasicString()}, {parent.toBasicString()}");

        var server_logic = GameServerApp.getServerLogic();
        var dynamo_db_connector = server_logic.getDynamoDbClient();

        if(false == m_alert_toggles.TryGetValue(alertTriggerType, out var found_alert_toggle))
        {
            err_msg = $"Not found AlertToggle !!! : alertTriggerType:{alertTriggerType} - {owner.toBasicString()}, {parent.toBasicString()}";
            Log.getLogger().error(err_msg);
            return;
        }
        if(false == found_alert_toggle)
        {
            err_msg = $"Check AlertToggle Off !!! : alertTriggerType:{alertTriggerType} - {owner.toBasicString()}, {parent.toBasicString()}";
            Log.getLogger().error(err_msg);
            return;
        }

        if (false == m_alert_functions.TryGetValue(alertTriggerType, out var found_alert_function))
        {
            err_msg = $"Not found AlertFunction !!! : alertTriggerType:{alertTriggerType} - {owner.toBasicString()}, {parent.toBasicString()}";
            Log.getLogger().debug(err_msg);
            return;
        }

        (result, var doc_bases, var alert_method_type) = await found_alert_function.Invoke(alertTriggerType);
        if(result.isFail())
        {
            err_msg = $"Failed to FnAlertFunction.Invoke !!! : {result.toBasicString()} - {owner.toBasicString()}, {parent.toBasicString()}";
            Log.getLogger().error(err_msg);
            return;
        }

        var alert_record_attribute = owner.getEntityAttribute<EntityAlertRecordAttribute>();
        if (null == alert_record_attribute)
        {
            err_msg = $"Not found EntityAlertRecordAttribute !!!, alert_record_attribute is null - {owner.toBasicString()}, {parent.toBasicString()}";
            Log.getLogger().error(err_msg);
            return;
        }

        (result, DynamoDbDocBase? doc_base_4_alert) = await alert_record_attribute.toDocBase();
        if (result.isFail())
        {
            err_msg = $"Failed to toDocBase() !!!, in EntityAlertAction.onAlert() - {owner.toBasicString()}, {parent.toBasicString()}";
            result.setFail(ServerErrorCode.EntityAttributeIsNull, err_msg);
            Log.getLogger().error(result.toBasicString());
            return;
        }
        NullReferenceCheckHelper.throwIfNull(doc_base_4_alert, () => $"doc_base_4_alert is null !!! - {owner.toBasicString()}, {parent.toBasicString()}");
        doc_bases.Add(doc_base_4_alert);

        var query_contexts = new List<DynamoDbDocumentQueryContext>();
        foreach (var doc in doc_bases)
        {
            (result, var query_context) = await doc.toDocumentQueryContext();
            if (result.isFail())
            {
                err_msg = $"Failed to toDocumentQueryContext() !!!, in EntityAlertAction.onAlert() : {result.toBasicString()} - {owner.toBasicString()}, {parent.toBasicString()}";
                Log.getLogger().error(err_msg);
                return;
            }
            NullReferenceCheckHelper.throwIfNull(query_context, () => $"query_context is null !!! - {owner.toBasicString()}, {parent.toBasicString()}");

            query_contexts.Add(query_context);
        }

        var alert_record_doc = doc_base_4_alert as EntityAlertRecordDoc;
        NullReferenceCheckHelper.throwIfNull(alert_record_doc, () => $"alert_record_doc is null !!! - {owner.toBasicString()}, {parent.toBasicString()}");

        var table = dynamo_db_connector.getTableByDoc(alert_record_doc);
        (result, _) = await table.simpleTransactWriteWithDocument(query_contexts);
        if (result.isFail())
        {
            err_msg = $"Failed to simpleTransactWriteWithDocument() !!!, in EntityAlertAction.onAlert() : {result.toBasicString()} - {owner.toBasicString()}, {parent.toBasicString()}";
            result.setFail(ServerErrorCode.DynamoDbTransactException, err_msg);
            Log.getLogger().error(err_msg);
            return;
        }

        m_alert_toggles[alertTriggerType] = false;

        if (EntityAlertMethodType.Mail == alert_method_type)
        {
            var found_user_mail_action = master.getEntityAction<MailAction>();
            found_user_mail_action.NewReceivedMail();
        }
    }

    private (Result, ALERT_KEY) makeAlertKey(EntityAlertTriggerType triggerType)
    {
        var owner = getOwner();
        NullReferenceCheckHelper.throwIfNull(owner, () => $"owner is null !!!");
        var parent = owner.getRootParent();
        NullReferenceCheckHelper.throwIfNull(parent, () => $"parent is null !!! - {owner.toBasicString()}");

        var err_msg = string.Empty;
        var result = new Result();

        (result, var meta_id) = owner.onGetMetaIdOfEntityAlertTriggerType(triggerType);
        if(result.isFail())
        {
            err_msg = $"Failed to getMetaIdOfEntityAlertType() !!! : {result.toBasicString()}, alertTriggerType:{triggerType} - {owner.toBasicString()}, {parent.toBasicString()}";
            Log.getLogger().error(err_msg);
            return (result, string.Empty);
        }

        return (result, EntityAlertRecordDoc.makeALERT_KEY(triggerType, meta_id));
    }

    public bool attachAlertFunction(EntityAlertTriggerType triggerType, FnAlertFunction fnAlertFunction)
    {
        var owner = getOwner();
        NullReferenceCheckHelper.throwIfNull(owner, () => $"owner is null !!!");
        var parent = owner.getRootParent();
        NullReferenceCheckHelper.throwIfNull(parent, () => $"parent is null !!! - {owner.toBasicString()}");

        var err_msg = string.Empty;

        if(false == m_alert_functions.TryAdd(triggerType, fnAlertFunction))
        {
            err_msg = $"Already registered AlertFunction !!! : alertTriggerType:{triggerType} - {owner.toBasicString()}, {parent.toBasicString()}";
            Log.getLogger().error(err_msg);
            return false;
        }

        m_alert_toggles[triggerType] = true;

        return true;
    }

    public bool detachAlertFunction(EntityAlertTriggerType triggerType)
    {
        var owner = getOwner();
        NullReferenceCheckHelper.throwIfNull(owner, () => $"owner is null !!!");
        var parent = owner.getRootParent();
        NullReferenceCheckHelper.throwIfNull(parent, () => $"parent is null !!! - {owner.toBasicString()}");

        var err_msg = string.Empty;

        if (false == m_alert_functions.TryRemove(triggerType, out _))
        {
            err_msg = $"Failed to TryRemove() !!!, in detachAlertFunction() : alertTriggerType:{triggerType} - {owner.toBasicString()}, {parent.toBasicString()}";
            Log.getLogger().warn(err_msg);
            return false;
        }

        m_alert_toggles[triggerType] = false;

        return true;
    }

    public bool hasAlert()
    {
        return 0 < m_alert_functions.Count;
    }
}