Initial split of the modules

NadekoBot.Core/Services/CurrencyService.cs

@@ -0,0 +1,118 @@
+using System;
+using System.Threading.Tasks;
+using Discord;
+using NadekoBot.Extensions;
+using NadekoBot.Services.Database.Models;
+using NadekoBot.Services.Database;
+using NadekoBot.Services;
+
+namespace NadekoBot.Services
+{
+    public class CurrencyService : INService
+    {
+        private readonly IBotConfigProvider _config;
+        private readonly DbService _db;
+
+        public CurrencyService(IBotConfigProvider config, DbService db)
+        {
+            _config = config;
+            _db = db;
+        }
+
+        public async Task<bool> RemoveAsync(IUser author, string reason, long amount, bool sendMessage)
+        {
+            var success = await RemoveAsync(author.Id, reason, amount);
+
+            if (success && sendMessage)
+                try { await author.SendErrorAsync($"`You lost:` {amount} {_config.BotConfig.CurrencySign}\n`Reason:` {reason}").ConfigureAwait(false); } catch { }
+
+            return success;
+        }
+
+        public async Task<bool> RemoveAsync(ulong authorId, string reason, long amount, IUnitOfWork uow = null)
+        {
+            if (amount < 0)
+                throw new ArgumentNullException(nameof(amount));
+            
+            if (uow == null)
+            {
+                using (uow = _db.UnitOfWork)
+                {
+                    var toReturn = InternalRemoveCurrency(authorId, reason, amount, uow);
+                    await uow.CompleteAsync().ConfigureAwait(false);
+                    return toReturn;
+                }
+            }
+
+            return InternalRemoveCurrency(authorId, reason, amount, uow);
+        }
+
+        private bool InternalRemoveCurrency(ulong authorId, string reason, long amount, IUnitOfWork uow)
+        {
+            var success = uow.Currency.TryUpdateState(authorId, -amount);
+            if (!success)
+                return false;
+            uow.CurrencyTransactions.Add(new CurrencyTransaction()
+            {
+                UserId = authorId,
+                Reason = reason,
+                Amount = -amount,
+            });
+            return true;
+        }
+
+        public async Task AddToManyAsync(string reason, long amount, params ulong[] userIds)
+        {
+            using (var uow = _db.UnitOfWork)
+            {
+                foreach (var userId in userIds)
+                {
+                    var transaction = new CurrencyTransaction()
+                    {
+                        UserId = userId,
+                        Reason = reason,
+                        Amount = amount,
+                    };
+                    uow.Currency.TryUpdateState(userId, amount);
+                    uow.CurrencyTransactions.Add(transaction);
+                }
+
+                await uow.CompleteAsync();
+            }
+        }
+
+        public async Task AddAsync(IUser author, string reason, long amount, bool sendMessage)
+        {
+            await AddAsync(author.Id, reason, amount);
+
+            if (sendMessage)
+                try { await author.SendConfirmAsync($"`You received:` {amount} {_config.BotConfig.CurrencySign}\n`Reason:` {reason}").ConfigureAwait(false); } catch { }
+        }
+
+        public async Task AddAsync(ulong receiverId, string reason, long amount, IUnitOfWork uow = null)
+        {
+            if (amount < 0)
+                throw new ArgumentNullException(nameof(amount));
+
+            var transaction = new CurrencyTransaction()
+            {
+                UserId = receiverId,
+                Reason = reason,
+                Amount = amount,
+            };
+
+            if (uow == null)
+                using (uow = _db.UnitOfWork)
+                {
+                    uow.Currency.TryUpdateState(receiverId, amount);
+                    uow.CurrencyTransactions.Add(transaction);
+                    await uow.CompleteAsync();
+                }
+            else
+            {
+                uow.Currency.TryUpdateState(receiverId, amount);
+                uow.CurrencyTransactions.Add(transaction);
+            }
+        }
+    }
+}