Currency creation and minting with basis of transactions

src/IO.Swagger/Repositories/CurrencyRepository.cs

@@ -0,0 +1,55 @@
+using IO.Swagger.Models.db;
+using IO.Swagger.Models.dto;
+using IO.Swagger.Services;
+using Microsoft.EntityFrameworkCore;
+using System;
+using System.Linq;
+using System.Threading.Tasks;
+
+namespace IO.Swagger.Repositories
+{
+    public class CurrencyRepository : ICurrencyRepository
+    {
+        BankDbContext context;
+
+        public CurrencyRepository(BankDbContext context)
+        {
+            this.context = context ?? throw new ArgumentNullException(nameof(context));
+        }
+
+        public async Task<bool> CreateCurrency(CurrencyCreateBody request, int userId)
+        {
+            request.Symbol = request.Symbol.Trim();
+            request.Name = request.Name.Trim();
+            if (await context.Currencies.AnyAsync(c => c.Symbol == request.Symbol || c.Name.ToLower() == request.Name.ToLower()))
+                return false;
+
+            await context.Currencies.AddAsync(new Currency
+            {
+                Name = request.Name,
+                Symbol = request.Symbol,
+                UserId = userId
+            });
+            
+            return await context.SaveChangesAsync() > 0;
+        }
+        
+        public async Task<bool> MintCurrency(CurrencyMintBody request, int userId)
+        {
+            var existsAndIsOwner = await context.Currencies.AnyAsync(c => c.CurrencyId == request.CurrencyId && c.UserId == userId);
+            if (!existsAndIsOwner)
+                return false;
+
+            await context.Transactions.AddAsync(new Transaction
+            {
+                Amount = request.Amount,
+                CurrencyId = request.CurrencyId,
+                ToUserId = userId,
+                FromUserId = userId,
+                Memo = "Minting"
+            });
+
+            return await context.SaveChangesAsync() > 0;
+        } 
+    }
+}