using System;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.Extensions.Logging;
using TOOHUCardAPI.Data.Enums;
using TOOHUCardAPI.Data.Models;
using TOOHUCardAPI.Data.Repositories;
using TOOHUCardAPI.DTO;

namespace TOOHUCardAPI.Data.Services
{
    public class StoreService
    {
        private readonly ILogger<StoreService> _logger;
        private readonly UserRepository _userRepository;
        private readonly CardRepository _cardRepository;

        public StoreService(ILogger<StoreService> logger, UserRepository userRepository, CardRepository cardRepository)
        {
            _logger = logger;
            _userRepository = userRepository;
            _cardRepository = cardRepository;
        }

        private async Task AddPoints(int points, User user)
        {
            user.Point = Math.Max(0, user.Point + points);
            await _userRepository.UpdateUser(user);
            _logger.LogInformation("User with steamid {SteamId} was given {PointsGiven} points. New total: {PointsTotal}", user.SteamId, points, user.Point);
        }

        public async Task AwardPoints(long steamid, int points, string reason)
        {
            User user = await _userRepository.GetUser(steamid);
            await AddPoints(points, user);
            _logger.LogInformation("awarded {Points} points to {SteamId} for reason [\"{reason}\"]", points, steamid, reason);
        }

        public async Task<User> SaveKeyTotal(long steamId, int keyTotal, int keyUseCount)
        {
            User user = await _userRepository.GetUser(steamId);
            _logger.LogInformation("User {SteamId} just stored some key total data, previous total and use: ({OldKeyTotal},{OldKeyUseCount}). new ({NewKeyTotal},{NewKeyUseCount})", user.SteamId, user.KeyTotal, user.KeyUseCount, keyTotal, keyUseCount);
            user.KeyTotal = keyTotal;
            user.KeyUseCount = keyUseCount;
            await _userRepository.UpdateUser(user);
            return user;
        }

        public async Task<int> ChangePowerMaxTotal(long steamId, int amt)
        {
            User user = await _userRepository.GetUser(steamId);
            user.PowerMaxTotal = Math.Clamp(user.PowerMaxTotal + amt, 0, int.MaxValue);
            await _userRepository.UpdateUser(user);
            _logger.LogInformation("User {SteamId} changed the number of MaxPower items they had by {Amount}", user.SteamId, amt);
            return user.PowerMaxTotal;
        }

        public async Task<int> LevelUpCard(long steamId, string itemName, int levelIncrease)
        {
            User user = await _userRepository.GetUser(steamId);
            Card card = await _cardRepository.GetCardByItemCode(itemName);
            CardLevel userCardLevel = user.CardLevels.Find(cl => cl.Card.ItemCode == itemName) ?? new CardLevel()
            {
                Card = card,
                Level = 0
            };
            int totalCost =
                (card.Quality == Rarity.Normal ? AppSettings.PointsPerLevelNormal : AppSettings.PointsPerLevel) *
                levelIncrease;
            if (user.Point < totalCost)
            {
                throw new InsufficientPointsException();
            }
            if (!user.CardLevels.Contains(userCardLevel))
            {
                user.CardLevels.Add(userCardLevel);
            }
            await AddPoints(-totalCost, user);
            userCardLevel.Level += levelIncrease;
            await _userRepository.UpdateUser(user);
            _logger.LogInformation("User with steamid {SteamId} leveled up card {CardName} to level {Level}", user.SteamId, card.CardName, userCardLevel.Level);
            return totalCost;
        }

        public async Task<int> PurchaseMagicKey(int amt, long steamId)
        {
            int totalCost = AppSettings.PointsPerKey * amt;
            amt = Math.Clamp(amt, 0, AppSettings.MaxKeyPurchaseAmount);
            User user = await _userRepository.GetUser(steamId);
            if (user.Point < totalCost)
            {
                throw new InsufficientPointsException();
            }

            await AddPoints(-totalCost, user);
            user.KeyTotal += amt;
            await _userRepository.UpdateUser(user);
            _logger.LogInformation("User with steamid {SteamId} purchased {NumberKeys} keys for {TotalCost} points. New point value is {NewPoints}", user.SteamId, amt, totalCost, user.Point);
            return totalCost;
        }

        public async Task<int> GiveFirstWinBonus(long steamId)
        {
            User user = await _userRepository.GetUser(steamId);

            if (user.LastFirstWin.AddDays(1) > DateTime.Now)
            {
                throw new NotFirstWinException();
            }

            int points = new Random().Next(AppSettings.FirstWinBonusPointsMin, AppSettings.FirstWinBonusPointsMax + 1);
            await AddPoints(points, user);
            user.LastFirstWin = DateTime.Now;
            await _userRepository.UpdateUser(user);
            _logger.LogInformation("User with steamid {SteamId} received first win of the day bonus, earning {BonusPoints} points. New value: {UserPoints}", user.SteamId, points, user.Point);
            return points;
        }
    }

}