using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using CommonDomain;
using CommonDomain.BaseModel;
using Microsoft.Extensions.Logging;
using MongoRepository;
using UserDomain.Entity;
using UserDomain.Enum;
using UserService.GameConfigs;
using UserService.Param;
using UserService.User;

namespace UserService.ScratchCard
{
    public class ScratchCardService : IScratchCardService
    {
        private const string ScratchCardNumber = "40005";

        private readonly IGameConfigService _gameConfig;
        private readonly IUserService _userService;
        private readonly IMongoBaseRepository<ScratchCardRecord> _recordRepo;
        private readonly ILogger<ScratchCardService> _logger;

        public ScratchCardService(
            IGameConfigService gameConfig,
            IUserService userService,
            IMongoBaseRepository<ScratchCardRecord> recordRepo,
            ILogger<ScratchCardService> logger)
        {
            _gameConfig = gameConfig;
            _userService = userService;
            _recordRepo = recordRepo;
            _logger = logger;
        }

        public async Task<(bool success, string message, ScratchCardResult? result)> Draw(string userId)
        {
            var gameConfig = await _gameConfig.Get();
            if (gameConfig == null)
                return (false, "游戏配置不存在", null);

            var configs = gameConfig.ScratchCardConfig;
            if (configs == null || configs.Count == 0)
                return (false, "刮刮卡活动暂未开放", null);

            var user = await _userService.GetUser(userId);
            if (user == null)
                return (false, "用户不存在", null);

            var prop = user.Props.FirstOrDefault(p => p.Number == ScratchCardNumber);
            if (prop == null || prop.Count <= 0)
                return (false, "刮刮卡数量不足", null);

            var deductResult = await _userService.UpdateAssets(new UserAssetParam
            {
                UserId = userId,
                ChangeType = UserAssetChangeTypeEnum.减少,
                RewardItems = new List<BaseProductCount>
                {
                    new BaseProductCount { Number = ScratchCardNumber, Count = 1 }
                },
                Source = RewardSource.刮刮卡,
                Remark = "使用刮刮卡",
                IsAddRecord = false
            });

            if (!deductResult.isok)
                return (false, deductResult.msg, null);

            var prize = DrawPrize(configs);
            if (prize == null)
                return (false, "奖项配置异常", null);

            var rewardItems = new List<BaseProductCount>();
            if (prize.Type == 3 && prize.BaseProduct != null)
            {
                rewardItems.Add(new BaseProductCount
                {
                    Number = prize.BaseProduct.Number,
                    Name = prize.BaseProduct.Name,
                    Type = prize.BaseProduct.Type,
                    Count = prize.Count
                });
            }

            (bool isok, string msg) awardResult;
            try
            {
                awardResult = await _userService.UpdateAssets(new UserAssetParam
                {
                    UserId = userId,
                    ChangeType = UserAssetChangeTypeEnum.增加,
                    Gold = prize.Type == 1 ? prize.Count : 0,
                    Diamond = prize.Type == 2 ? prize.Count : 0,
                    RewardItems = rewardItems,
                    Source = RewardSource.刮刮卡,
                    Remark = "刮刮卡奖励"
                });
            }
            catch (Exception ex)
            {
                _logger.LogError(ex, "刮刮卡发奖失败 userId={UserId} prizeType={PrizeType} count={Count}",
                    userId, prize.Type, prize.Count);
                return (false, "刮奖失败，请稍后重试", null);
            }

            if (!awardResult.isok)
                return (false, awardResult.msg, null);

            var record = new ScratchCardRecord
            {
                UserId = userId,
                PrizeType = prize.Type,
                PrizeName = prize.Type == 1 ? $"{prize.Count}金币" :
                            prize.Type == 2 ? $"{prize.Count}钻石" :
                            prize.BaseProduct?.Name ?? "",
                Count = prize.Count,
                BaseProduct = prize.BaseProduct
            };
            try
            {
                await _recordRepo.InsertOneAsync(record);
            }
            catch (Exception ex)
            {
                _logger.LogError(ex, "刮刮卡中奖记录写入失败 userId={UserId} prizeType={PrizeType} count={Count}",
                    userId, prize.Type, prize.Count);
            }

            var result = new ScratchCardResult
            {
                PrizeType = prize.Type,
                PrizeName = prize.Type == 1 ? $"{prize.Count}金币" :
                           prize.Type == 2 ? $"{prize.Count}钻石" :
                           prize.BaseProduct?.Name ?? "",
                Count = prize.Count,
                BaseProduct = prize.BaseProduct
            };

            return (true, "恭喜获得奖励！", result);
        }

        private static ScratchCardConfig? DrawPrize(List<ScratchCardConfig> configs)
        {
            var totalWeight = configs.Sum(c => (long)c.Weight);
            if (totalWeight <= 0) return null;

            var random = new Random();
            var randomValue = random.NextInt64(0, totalWeight);
            long currentSum = 0;

            foreach (var config in configs)
            {
                currentSum += config.Weight;
                if (randomValue < currentSum)
                    return config;
            }

            return configs.LastOrDefault();
        }
    }
}