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


using StackExchange.Redis;


using ServerCore; using ServerBase;
using ServerCommon;
using ServerCommon.Cache;


using META_ID = System.UInt32;
using REQUESTOR_ID = System.String;


namespace GameServer
{
    public static class LandAuctionCacheHelper
    {
        public static async Task<Result> trySaveToCache(this LandAuction landAuction, REQUESTOR_ID requestorId)
        {
            var server_logic = GameServerApp.getServerLogic();
            var redis_connector = server_logic.getRedisConnector();

            var result = new Result();

            var land_auction_action = landAuction.getEntityAction<LandAuctionAction>();
            NullReferenceCheckHelper.throwIfNull(land_auction_action, () => $"land_auction_action is null !!! - {landAuction.toBasicString()}");

            var registry_attribute = landAuction.getEntityAttribute<LandAuctionRegistryAttribute>();
            NullReferenceCheckHelper.throwIfNull(registry_attribute, () => $"registry_attribute is null !!! - {landAuction.toBasicString()}");
            var highest_bid_user_attribute = landAuction.getEntityAttribute<LandAuctionHighestBidUserAttribute>();
            NullReferenceCheckHelper.throwIfNull(highest_bid_user_attribute, () => $"highest_bid_user_attribute is null !!! - {landAuction.toBasicString()}");

            var land_auction_cache = new LandAuctionCache();
            land_auction_cache.LandMetaId = registry_attribute.LandMetaId;
            land_auction_cache.AuctionNumber = registry_attribute.AuctionNumber;

            land_auction_cache.LandAuctionState = registry_attribute.LandAuctionState;
            land_auction_cache.LandAuctionResult = registry_attribute.LandAuctionResult;
            land_auction_cache.ProcessVersionTime = registry_attribute.ProcessVersionTime;

            var land_auction_cache_request = new LandAuctionCacheRequest(land_auction_cache, redis_connector);
            result = await land_auction_cache_request.upsertLandAuction(DateTimeHelper.toRemainingTimeMin(registry_attribute.AuctionEndTime));
            if (result.isFail())
            {
                return result;
            }

            if (LandAuctionState.Started == land_auction_cache.LandAuctionState)
            {
                await landAuction.tryRemoveLandAuctionTopBidderBlockFromCache();
            }

            land_auction_action.resetCacheSaveStep();

            var is_success = await landAuction.tryReleaseWriteLockWithLandAuction(requestorId);
            if (false == is_success)
            {
                var err_msg = $"Failed to tryReleaseWriteLockWithLandAuction() !!! - {landAuction.toBasicString()}";
                Log.getLogger().warn(err_msg);
            }

            Log.getLogger().debug($"Called trySaveToCache() - {landAuction.toBasicString()}");

            return result;
        }

        public static async Task<bool> tryAcquireWriteLockWithLandAuctionBidders(this LandAuction landAuction, REQUESTOR_ID requestorId, Int16 ttlSec)
        {
            var result = new Result();

            var server_logic = GameServerApp.getServerLogic();
            var redis_connector = server_logic.getRedisConnector();
            var redis_lua_executor = server_logic.getRedisWithLuaScriptExecutor();

            var land_auction_registry_attribute = landAuction.getEntityAttribute<LandAuctionRegistryAttribute>();
            NullReferenceCheckHelper.throwIfNull(land_auction_registry_attribute, () => $"land_auction_registry_attribute is null !!! - requestorId:{requestorId}");

            var land_meta_id = land_auction_registry_attribute.LandMetaId;

            var bid_price_order_cache_request = new LandAuctionBidPriceOrderCacheRequest(land_meta_id, redis_connector);

            var lock_key = $"lock:{bid_price_order_cache_request.toKey()}";
            var locker_id = $"locker_id:{requestorId}";

            var is_success = await redis_lua_executor.tryAcquireLock(lock_key, locker_id, ttlSec);
            if (false == is_success)
            {
                var err_msg = $"Failed to tryAcquireLock() !!! : LockKey:{lock_key}, LockerId:{locker_id}, TTLSec:{ttlSec} - {landAuction.toBasicString()}";
                Log.getLogger().error(err_msg);

                return false;
            }

            return true;
        }

        public static async Task<bool> tryReleaseWriteLockWithLandAuctionBidders(this LandAuction landAuction, REQUESTOR_ID requestorId)
        {
            var result = new Result();

            var server_logic = GameServerApp.getServerLogic();
            var redis_connector = server_logic.getRedisConnector();
            var redis_lua_executor = server_logic.getRedisWithLuaScriptExecutor();

            var land_auction_attribute = landAuction.getEntityAttribute<LandAuctionRegistryAttribute>();
            NullReferenceCheckHelper.throwIfNull(land_auction_attribute, () => $"land_auction_attribute is null !!! - requestorId:{requestorId}");

            var land_meta_id = land_auction_attribute.LandMetaId;

            var bid_price_order_cache_request = new LandAuctionBidPriceOrderCacheRequest(land_meta_id, redis_connector);

            var lock_key = $"lock:{bid_price_order_cache_request.toKey()}";
            var locker_id = $"locker_id:{requestorId}";

            var is_success = await redis_lua_executor.tyrReleaseLock(lock_key, locker_id);
            if (false == is_success)
            {
                var err_msg = $"Failed to tyrReleaseLock() !!! : LockKey:{lock_key}, LockerId:{locker_id} - {landAuction.toBasicString()}";
                Log.getLogger().warn(err_msg);

                return false;
            }

            return true;
        }

        public static async Task<(bool, LandAuctionTopBidderCache?, LandAuctionTopBidderCache?, bool)> tryRankLandAuctionTopBidderCache(this LandAuction landAuction, REQUESTOR_ID requestorId, double bidPrice)
        {
            var server_logic = GameServerApp.getServerLogic();
            var redis_connector = server_logic.getRedisConnector();
            var redis_lua_executor = server_logic.getRedisWithLuaScriptExecutor();

            var land_auction_action = landAuction.getEntityAction<LandAuctionAction>();
            NullReferenceCheckHelper.throwIfNull(land_auction_action, () => $"land_auction_action is null !!! - requestorId:{requestorId}");

            var land_meta_id = land_auction_action.getLandMetaId();

            var bid_price_order_cache_request = new LandAuctionBidPriceOrderCacheRequest(land_meta_id, redis_connector);

            ( var is_success
            , var curr_ranker_id, var curr_ranker_score
            , var old_ranker_id, var old_ranker_score
            , var is_top_change ) = await redis_lua_executor.tryPlaceTopRankOnly( bid_price_order_cache_request.toKey()
                                                                                , requestorId
                                                                                , bidPrice, bid_price_order_cache_request.toBlockKey());
            if (false == is_success)
            {
                var err_msg = $"Failed to tryPlaceTopRankOnly() !!! : {bid_price_order_cache_request.toKeyAll()} - {landAuction.toBasicString()}";
                Log.getLogger().error(err_msg);

                return (false, null, null, false);
            }

            var curr_top_bidder = new LandAuctionTopBidderCache();
            curr_top_bidder.LandMetaId = land_meta_id;
            curr_top_bidder.HighestBidUserGuid = curr_ranker_id;
            curr_top_bidder.HighestBidPrice = curr_ranker_score;

            if (true == is_top_change)
            {
                if(false == old_ranker_id.isNullOrWhiteSpace())
                {
                    var old_top_bidder = new LandAuctionTopBidderCache();
                    old_top_bidder.LandMetaId = land_meta_id;
                    old_top_bidder.HighestBidUserGuid = old_ranker_id;
                    old_top_bidder.HighestBidPrice = old_ranker_score;

                    return (true, curr_top_bidder, old_top_bidder, is_top_change);
                }
            }

            return (true, curr_top_bidder, null, is_top_change);
        }

        public static async Task<(bool, LandAuctionTopBidderCache?)> tryGetLandAuctionTopBidderCacheWithBlock(this LandAuction landAuction)
        {
            var server_logic = GameServerApp.getServerLogic();
            var redis_connector = server_logic.getRedisConnector();
            var redis_lua_executor = server_logic.getRedisWithLuaScriptExecutor();

            var land_auction_action = landAuction.getEntityAction<LandAuctionAction>();
            NullReferenceCheckHelper.throwIfNull(land_auction_action, () => $"land_auction_action is null !!! - {landAuction.toBasicString()}");

            var err_msg = string.Empty;

            var land_meta_id = land_auction_action.getLandMetaId();

            var bid_price_order_cache_request = new LandAuctionBidPriceOrderCacheRequest(land_meta_id, redis_connector);

            ( var is_success
            , var is_top_found
            , var top_ranker_id, var top_ranker_score ) = await redis_lua_executor.tryGetTopRankAndSetBlock( bid_price_order_cache_request.toKey()
                                                                                                           , bid_price_order_cache_request.toBlockKey() );
            if (false == is_success)
            {
                err_msg = $"Failed to tryGetTopRankAndSetBlock() !!! : {bid_price_order_cache_request.toKeyAll()} - {landAuction.toBasicString()}";
                Log.getLogger().error(err_msg);

                return (false, null);
            }

            if (true == is_top_found)
            {
                var curr_top_bidder = new LandAuctionTopBidderCache();
                curr_top_bidder.LandMetaId = land_meta_id;
                curr_top_bidder.HighestBidUserGuid = top_ranker_id;
                curr_top_bidder.HighestBidPrice = top_ranker_score;

                return (true, curr_top_bidder);
            }

            return (true, null);
        }

        public static async Task<(Result, LandAuctionTopBidderCache?)> tryGetLandAuctionTopBidderCache(this LandAuction landAuction)
        {
            var result = new Result();
            var err_msg = string.Empty;

            var server_logic = GameServerApp.getServerLogic();
            var redis_connector = server_logic.getRedisConnector();
            var redis_db = redis_connector.getDatabase();
            NullReferenceCheckHelper.throwIfNull(redis_db, () => $"redis_db is null !!!");

            var land_auction_attribute = landAuction.getEntityAttribute<LandAuctionRegistryAttribute>();
            NullReferenceCheckHelper.throwIfNull(land_auction_attribute, () => $"land_auction_attribute is null !!!");

            var top_bidder = new LandAuctionTopBidderCache();
            var land_meta_id = land_auction_attribute.LandMetaId;

            var bid_price_order_cache_request = new LandAuctionBidPriceOrderCacheRequest(land_meta_id, redis_connector);

            try
            {
                var top_ranker = await redis_db.SortedSetRangeByRankWithScoresAsync(bid_price_order_cache_request.toKey(), 0, 0, Order.Descending);
                if (top_ranker.Length == 0)
                {
                    return (result, null);
                }

                top_bidder.LandMetaId = land_meta_id;
                top_bidder.HighestBidUserGuid = top_ranker[0].Element.ToString();
                top_bidder.HighestBidPrice = top_ranker[0].Score;

                return (result, top_bidder);
            }
            catch (Exception e)
            {
                var error_code = ServerErrorCode.TryCatchException;
                err_msg = $"Exception !!!, Failed to perfom in tryGetLandAuctionTopBidderCache() !!! : exception:{e}, errorCode:{error_code}, key:{bid_price_order_cache_request.toKey()} - {landAuction.toBasicString()}";
                result.setFail(error_code, err_msg);
                Log.getLogger().error(result.toBasicString());
            }

            return (result, null);
        }

        public static async Task<bool> tryRemoveLandAuctionTopBidderBlockFromCache(this LandAuction landAuction)
        {
            var server_logic = GameServerApp.getServerLogic();
            var redis_connector = server_logic.getRedisConnector();
            var redis_lua_executor = server_logic.getRedisWithLuaScriptExecutor();

            var err_msg = string.Empty;

            var land_auction_action = landAuction.getEntityAction<LandAuctionAction>();
            NullReferenceCheckHelper.throwIfNull(land_auction_action, () => $"land_auction_action is null !!! - {landAuction.toBasicString()}");

            var land_meta_id = land_auction_action.getLandMetaId();

            var bid_price_order_cache_request = new LandAuctionBidPriceOrderCacheRequest(land_meta_id, redis_connector);

            var is_success = await redis_lua_executor.tryRemoveTopRankAndBlock( bid_price_order_cache_request.toKey()
                                                                              , bid_price_order_cache_request.toBlockKey() );
            if (false == is_success)
            {
                err_msg = $"Failed to tryRemoveTopRankAndBlock() !!! : {bid_price_order_cache_request.toKeyAll()} - {landAuction.toBasicString()}";
                Log.getLogger().warn(err_msg);

                return false;
            }

            return true;
        }

        public static async Task<bool> isExistTopBidderFromCache(this LandAuction landAuction)
        {
            var server_logic = GameServerApp.getServerLogic();
            var redis_connector = server_logic.getRedisConnector();

            var land_auction_attribute = landAuction.getEntityAttribute<LandAuctionRegistryAttribute>();
            NullReferenceCheckHelper.throwIfNull(land_auction_attribute, () => $"land_auction_attribute is null !!! - {landAuction.toBasicString()}");

            var land_meta_id = land_auction_attribute.LandMetaId;

            var bid_price_order_cache_request = new LandAuctionBidPriceOrderCacheRequest(land_meta_id, redis_connector);

            var is_exist_key = await bid_price_order_cache_request.isExistKey();
            if (false == is_exist_key)
            {
                return false;
            }

            return true;
        }

        public static async Task<bool> IsExistLandAuctionFromCache(this LandAuction landAuction, REQUESTOR_ID requestorId)
        {
            var server_logic = GameServerApp.getServerLogic();
            var redis_connector = server_logic.getRedisConnector();
            var redis_lua_executor = server_logic.getRedisWithLuaScriptExecutor();

            var land_auction_attribute = landAuction.getEntityAttribute<LandAuctionRegistryAttribute>();
            NullReferenceCheckHelper.throwIfNull(land_auction_attribute, () => $"land_auction_attribute is null !!! - requstorId:{requestorId}");

            var land_meta_id = land_auction_attribute.LandMetaId;

            var land_auction_cache_request = new LandAuctionCacheRequest(land_meta_id, redis_connector);

            var is_exist_key = await land_auction_cache_request.isExistKey();
            if (false == is_exist_key)
            {
                return false;
            }

            return true;
        }

        public static async Task<(bool, string)> tryGetLandAuctionWithWriteLock(this LandAuction landAuction, REQUESTOR_ID requestorId, Int16 ttlSec)
        {
            var result = new Result();
            var err_msg = string.Empty;

            var server_logic = GameServerApp.getServerLogic();
            var redis_connector = server_logic.getRedisConnector();
            var redis_lua_executor = server_logic.getRedisWithLuaScriptExecutor();

            var land_auction_attribute = landAuction.getEntityAttribute<LandAuctionRegistryAttribute>();
            NullReferenceCheckHelper.throwIfNull(land_auction_attribute, () => $"land_auction_attribute is null !!! - requstorId:{requestorId}");

            var land_meta_id = land_auction_attribute.LandMetaId;

            var land_auction_cache_request = new LandAuctionCacheRequest(land_meta_id, redis_connector);

            var lock_key = $"lock:{land_auction_cache_request.toKey()}";
            var locker_id = $"locker_id:{requestorId}";

            (var is_success, var read_data) = await redis_lua_executor.tryReadWithLock( lock_key, locker_id
                                                                                      , land_auction_cache_request.toKey(), ttlSec );
            if (false == is_success)
            {
                err_msg = $"Failed to tryReadWithLock() !!! : LockKey:{land_auction_cache_request.toKey()}, LockerId:{locker_id}, TTLSec:{ttlSec} - {landAuction.toBasicString()}";
                Log.getLogger().warn(err_msg);

                return (false, string.Empty);
            }
            if(null == read_data)
            {
                return (true, string.Empty);
            }

            return (true, read_data);
        }

        public static async Task<bool> tryAcquireWriteLockWithLandAuction(this LandAuction landAuction, REQUESTOR_ID requestorId, Int16 ttlSec)
        {
            var result = new Result();
            var err_msg = string.Empty;

            var server_logic = GameServerApp.getServerLogic();
            var redis_connector = server_logic.getRedisConnector();
            var redis_lua_executor = server_logic.getRedisWithLuaScriptExecutor();

            var land_auction_attribute = landAuction.getEntityAttribute<LandAuctionRegistryAttribute>();
            NullReferenceCheckHelper.throwIfNull(land_auction_attribute, () => $"land_auction_attribute is null !!! - requestorId:{requestorId}");

            var land_meta_id = land_auction_attribute.LandMetaId;

            var land_auction_cache_request = new LandAuctionCacheRequest(land_meta_id, redis_connector);

            var lock_key = $"lock:{land_auction_cache_request.toKey()}";
            var locker_id = $"locker_id:{requestorId}";

            var is_success = await redis_lua_executor.tryAcquireLock(lock_key, locker_id, ttlSec);
            if (false == is_success)
            {
                err_msg = $"Failed to tryAcquireLock() !!! : LockKey:{land_auction_cache_request.toKey()}, LockerId:{locker_id}, TTLSec:{ttlSec} - {landAuction.toBasicString()}";
                Log.getLogger().warn(err_msg);

                return false;
            }

            return true;
        }

        public static async Task<bool> tryReleaseWriteLockWithLandAuction(this LandAuction landAuction, REQUESTOR_ID requestorid)
        {
            var result = new Result();
            var err_msg = string.Empty;

            var server_logic = GameServerApp.getServerLogic();
            var redis_connector = server_logic.getRedisConnector();
            var redis_lua_executor = server_logic.getRedisWithLuaScriptExecutor();

            var land_auction_attribute = landAuction.getEntityAttribute<LandAuctionRegistryAttribute>();
            NullReferenceCheckHelper.throwIfNull(land_auction_attribute, () => $"land_auction_attribute is null !!! - requstorId:{requestorid}");

            var land_meta_id = land_auction_attribute.LandMetaId;

            var land_auction_cache_request = new LandAuctionCacheRequest(land_meta_id, redis_connector);

            var lock_key = $"lock:{land_auction_cache_request.toKey()}";
            var locker_id = $"locker_id:{requestorid}";

            var is_success = await redis_lua_executor.tyrReleaseLock(lock_key, locker_id);
            if (false == is_success)
            {
                err_msg = $"Failed to tyrReleaseLock() !!! : LockKey:{land_auction_cache_request.toKey()}, LockerId:{locker_id} - {landAuction.toBasicString()}";
                Log.getLogger().warn(err_msg);
                return false;
            }

            return true;
        }

        public static async Task<bool> tryAcquireWriteLockWithLandAuctionReservation(REQUESTOR_ID requestorId, Int16 ttlSec)
        {
            var result = new Result();
            var err_msg = string.Empty;

            var server_logic = GameServerApp.getServerLogic();
            var redis_connector = server_logic.getRedisConnector();
            var redis_lua_executor = server_logic.getRedisWithLuaScriptExecutor();

            var lock_key = $"land_auction_reservation:write_lock";
            var locker_id = $"land_auction_reservation:locker_id:{requestorId}";

            var is_success = await redis_lua_executor.tryAcquireLock(lock_key, locker_id, ttlSec);
            if (false == is_success)
            {
                err_msg = $"Failed to tryAcquireLock() !!! : LockKey:{lock_key}, LockerId:{locker_id}, TTLSec:{ttlSec} - requstorId:{requestorId}";
                Log.getLogger().warn(err_msg);

                return false;
            }

            return true;
        }

        public static async Task<bool> tryReleaseWriteLockWithLandAuctionReservation(REQUESTOR_ID requestorId)
        {
            var result = new Result();
            var err_msg = string.Empty;

            var server_logic = GameServerApp.getServerLogic();
            var redis_connector = server_logic.getRedisDb();
            var redis_lua_executor = server_logic.getRedisWithLuaScriptExecutor();

            var lock_key = $"land_auction_reservation:write_lock";
            var locker_id = $"land_auction_reservation:locker_id:{requestorId}";

            var is_success = await redis_lua_executor.tyrReleaseLock(lock_key, locker_id);
            if (false == is_success)
            {
                err_msg = $"Failed to tyrReleaseLock() !!! : LockKey:{lock_key}, LockerId:{locker_id} - requstorId:{requestorId}";
                Log.getLogger().warn(err_msg);
                return false;
            }

            return true;
        }
    }
}