Initial

TaxCalculator.Api/Controllers/SalaryController.cs

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+namespace TaxCalculator.Api.Controllers
+{
+    using Domain;
+    using Microsoft.AspNetCore.Mvc;
+    using TaxCalculator.Models;
+
+    [Route("api/[controller]")]
+    [ApiController]
+    public class SalaryController : ControllerBase
+    {
+        private readonly ISalaryService _salaryService;
+
+        public SalaryController(ISalaryService salaryService)
+        {
+            _salaryService = salaryService;
+        }
+
+        [HttpPost]
+        public async Task<SalaryDetails> Post([FromBody] int grossAnnualSalary)
+        {
+            var salaryDetails = await _salaryService.CalculateSalaryDetails(grossAnnualSalary);
+
+            return salaryDetails;
+        }
+    }
+}

TaxCalculator.Api/Dockerfile

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+#See https://aka.ms/customizecontainer to learn how to customize your debug container and how Visual Studio uses this Dockerfile to build your images for faster debugging.
+
+FROM mcr.microsoft.com/dotnet/aspnet:8.0 AS base
+USER app
+WORKDIR /app
+EXPOSE 8080
+EXPOSE 8081
+
+FROM mcr.microsoft.com/dotnet/sdk:8.0 AS build
+ARG BUILD_CONFIGURATION=Release
+WORKDIR /src
+COPY ["TaxCalculator.Api/TaxCalculator.Api.csproj", "TaxCalculator.Api/"]
+RUN dotnet restore "./TaxCalculator.Api/./TaxCalculator.Api.csproj"
+COPY . .
+WORKDIR "/src/TaxCalculator.Api"
+RUN dotnet build "./TaxCalculator.Api.csproj" -c $BUILD_CONFIGURATION -o /app/build
+
+FROM build AS publish
+ARG BUILD_CONFIGURATION=Release
+RUN dotnet publish "./TaxCalculator.Api.csproj" -c $BUILD_CONFIGURATION -o /app/publish /p:UseAppHost=false
+
+FROM base AS final
+WORKDIR /app
+COPY --from=publish /app/publish .
+ENTRYPOINT ["dotnet", "TaxCalculator.Api.dll"]

TaxCalculator.Api/Program.cs

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+
+namespace TaxCalculator.Api
+{
+    using DAL;
+    using TaxCalculator.Api.Services;
+    using TaxCalculator.Models;
+
+    public class Program
+    {
+        public static void Main(string[] args)
+        {
+            var builder = WebApplication.CreateBuilder(args);
+
+            // Add services to the container.
+            builder.Services.AddControllers();
+
+            // Register your services and repositories here
+            builder.Services.AddScoped<ITaxBandRepository, TaxBandRepository>();
+            builder.Services.AddScoped<ITaxCalculatorService, TaxCalculatorService>();            
+            builder.Services.AddScoped<ISalaryService, SalaryService>();
+
+            // Learn more about configuring Swagger/OpenAPI at https://aka.ms/aspnetcore/swashbuckle
+            builder.Services.AddEndpointsApiExplorer();
+            builder.Services.AddSwaggerGen();
+
+            var app = builder.Build();
+
+            // Configure the HTTP request pipeline.
+            if (app.Environment.IsDevelopment())
+            {
+                app.UseSwagger();
+                app.UseSwaggerUI();
+            }
+
+            app.UseHttpsRedirection();
+
+            // Configure CORS with the variable
+            app.UseCors(builder =>
+            {
+                builder.AllowAnyOrigin()
+                       .AllowAnyMethod()
+                       .AllowAnyHeader();
+            });
+
+            app.UseAuthorization();
+
+            app.MapControllers();
+
+            app.Run();
+        }
+    }
+}

TaxCalculator.Api/Properties/launchSettings.json

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+{
+  "profiles": {
+    "http": {
+      "commandName": "Project",
+      "launchBrowser": true,
+      "launchUrl": "swagger",
+      "environmentVariables": {
+        "ASPNETCORE_ENVIRONMENT": "Development"
+      },
+      "dotnetRunMessages": true,
+      "applicationUrl": "http://localhost:5020"
+    },
+    "https": {
+      "commandName": "Project",
+      "launchBrowser": true,
+      "launchUrl": "swagger",
+      "environmentVariables": {
+        "ASPNETCORE_ENVIRONMENT": "Development"
+      },
+      "dotnetRunMessages": true,
+      "applicationUrl": "https://localhost:7122;http://localhost:5020"
+    },
+    "IIS Express": {
+      "commandName": "IISExpress",
+      "launchBrowser": true,
+      "launchUrl": "swagger",
+      "environmentVariables": {
+        "ASPNETCORE_ENVIRONMENT": "Development"
+      }
+    },
+    "Docker": {
+      "commandName": "Docker",
+      "launchBrowser": true,
+      "launchUrl": "{Scheme}://{ServiceHost}:{ServicePort}/swagger",
+      "environmentVariables": {
+        "ASPNETCORE_HTTPS_PORTS": "8081",
+        "ASPNETCORE_HTTP_PORTS": "8080"
+      },
+      "publishAllPorts": true,
+      "useSSL": true
+    }
+  },
+  "$schema": "http://json.schemastore.org/launchsettings.json",
+  "iisSettings": {
+    "windowsAuthentication": false,
+    "anonymousAuthentication": true,
+    "iisExpress": {
+      "applicationUrl": "http://localhost:55237",
+      "sslPort": 44352
+    }
+  }
+}

TaxCalculator.Api/Services/ISalaryService.cs

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+namespace TaxCalculator.Models
+{
+    using Domain;
+
+    public interface ISalaryService
+    {
+        Task<SalaryDetails> CalculateSalaryDetails(int grossAnnualSalary);
+    }
+}

TaxCalculator.Api/Services/ITaxCalculatorService.cs

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+namespace TaxCalculator.Api.Services
+{
+    public interface ITaxCalculatorService
+    {
+        Task<decimal> CalculateTax(int annualSalary);
+    }
+}

TaxCalculator.Api/Services/SalaryService .cs

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+namespace TaxCalculator.Api.Services
+{
+    using Domain;
+    using TaxCalculator.Models;
+
+    public class SalaryService : ISalaryService
+    {
+        private readonly ITaxCalculatorService _taxCalculator;
+
+        public SalaryService(ITaxCalculatorService taxCalculator)
+        {
+            _taxCalculator = taxCalculator ?? throw new ArgumentNullException(nameof(taxCalculator));
+        }
+
+        public async Task<SalaryDetails> CalculateSalaryDetails(int grossAnnualSalary)
+        {
+            if (grossAnnualSalary < 0)
+            {
+                throw new ArgumentException("Gross annual salary must be non-negative.");
+            }
+
+            // Calculate tax once
+            decimal annualTax = await _taxCalculator.CalculateTax(grossAnnualSalary);
+
+            decimal netAnnualSalary = grossAnnualSalary - annualTax;
+            decimal grossMonthlySalary = (decimal)grossAnnualSalary / 12;
+            decimal netMonthlySalary = netAnnualSalary / 12;
+            decimal monthlyTaxPaid = annualTax / 12;
+
+            return new SalaryDetails
+            {
+                GrossAnnualSalary = grossAnnualSalary,
+                GrossMonthlySalary = Math.Round(grossMonthlySalary, 2),
+                NetAnnualSalary = netAnnualSalary,
+                NetMonthlySalary = Math.Round(netMonthlySalary, 2),
+                AnnualTaxPaid = annualTax,
+                MonthlyTaxPaid = Math.Round(monthlyTaxPaid, 2)
+            };
+        }
+    }
+}

TaxCalculator.Api/Services/TaxCalculatorService.cs

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+namespace TaxCalculator.Api.Services
+{
+    using DAL;
+
+    public class TaxCalculatorService : ITaxCalculatorService
+    {
+        private readonly ITaxBandRepository _taxBandRepository;
+
+        public TaxCalculatorService(ITaxBandRepository taxBandRepository)
+        {
+            _taxBandRepository = taxBandRepository ?? throw new ArgumentNullException(nameof(taxBandRepository));
+        }
+
+        public async Task<decimal> CalculateTax(int annualSalary)
+        {
+            if (annualSalary < 0)
+            {
+                throw new ArgumentException("Gross annual salary must be non-negative.");
+            }
+
+            decimal taxPaid = 0;
+
+            foreach (var band in await _taxBandRepository.GetTaxBands())
+            {
+                if (annualSalary <= band.LowerLimit)
+                    continue;
+
+                decimal taxableAmountInBand = band.UpperLimit.HasValue
+                    ? Math.Min(annualSalary, band.UpperLimit.Value) - band.LowerLimit
+                    : annualSalary - band.LowerLimit;
+
+                decimal taxInBand = taxableAmountInBand * (band.TaxRate / 100m);
+                taxPaid += taxInBand;
+
+                if (!band.UpperLimit.HasValue || annualSalary <= band.UpperLimit.Value)
+                    break;
+            }
+
+            return taxPaid;
+        }
+    }
+}

TaxCalculator.Api/TaxCalculator.Api.csproj

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+<Project Sdk="Microsoft.NET.Sdk.Web">
+
+  <PropertyGroup>
+    <TargetFramework>net8.0</TargetFramework>
+    <Nullable>enable</Nullable>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <InvariantGlobalization>true</InvariantGlobalization>
+    <UserSecretsId>da1c3abf-bae6-42a2-9318-1ee6c4dd7e64</UserSecretsId>
+    <DockerDefaultTargetOS>Linux</DockerDefaultTargetOS>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.AspNetCore.Cors" Version="2.2.0" />
+    <PackageReference Include="Microsoft.VisualStudio.Azure.Containers.Tools.Targets" Version="1.19.5" />
+    <PackageReference Include="Swashbuckle.AspNetCore" Version="6.4.0" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <Folder Include="Models\" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\DAL\DAL.csproj" />
+    <ProjectReference Include="..\Domain\Domain.csproj" />
+  </ItemGroup>
+
+</Project>

TaxCalculator.Api/TaxCalculator.Api.http

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+@TaxCalculator.Api_HostAddress = http://localhost:5020
+
+GET {{TaxCalculator.Api_HostAddress}}/weatherforecast/
+Accept: application/json
+
+###

TaxCalculator.Api/appsettings.Development.json

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+{
+  "Logging": {
+    "LogLevel": {
+      "Default": "Information",
+      "Microsoft.AspNetCore": "Warning"
+    }
+  }
+}

TaxCalculator.Api/appsettings.json

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+{
+  "Logging": {
+    "LogLevel": {
+      "Default": "Information",
+      "Microsoft.AspNetCore": "Warning"
+    }
+  },
+  "AllowedHosts": "*"
+}